ETHYLPARABEN USP GRADE ANTIMICROBIAL PRESERVATIVE

Description of Ethylparaben USP — High-Purity Ethyl Ester of para-Hydroxybenzoic Acid

At Quimiconsult we offer Ethylparaben USP, also known as ethyl ester of para-hydroxybenzoic acid (4-hydroxybenzoic acid), ethylparaben (etilparabeno), ethyl paraben (etil parabeno) or ethylparaben, a pharmaceutical grade antimicrobial preservative widely used worldwide in the cosmetic, pharmaceutical and food industries for its strong bacteriostatic and fungistatic power, its excellent safety profile documented over decades of commercial use, and its unique balance between water solubility and biocidal potency, which positions it as the intermediate paraben of the family and one of the most regulatorily versatile. It is a fine white powder, odorless and tasteless, with a certified assay of 98.0 to 102.0% purity per the USP monograph, heavy metals (as lead) less than or equal to 10 mg/kg, and a low acidity value (NMT 0.1 mL of 0.1 N NaOH required to turn the indicator blue), parameters that guarantee pharmacopeial quality suitable for critical applications in products for human consumption and application.

Ethylparaben USP belongs to the paraben family (alkyl esters of para-hydroxybenzoic acid), a group of chemical preservatives found naturally in many plants, fruits and vegetables (blueberries, carrots, apples, mango, strawberries, vanilla and other plants), where they act as a natural defense mechanism against microorganisms. This natural occurrence has been the subject of scientific research for decades and supports the long documented safety record of parabens in regulated pharmaceutical, cosmetic and food applications. Its CAS number is 120-47-8, molecular formula C₉H₁₀O₃, molecular weight 166.17 g/mol, melting point 115-118 °C, and it is recognized internationally under monographs of the USP (United States Pharmacopeia), BP (British Pharmacopoeia), EP (European Pharmacopoeia), JP (Japanese Pharmacopoeia) and as food additive code E-214 in European Union regulations (unlike propylparaben E-216, whose food use was withdrawn in the EU in 2006, ethylparaben E-214 remains an authorized food additive under European regulations, which makes it one of the few parabens with current food use in the European Union at regulated concentrations).

Ethylparaben is characterized by its broad-spectrum biocidal action covering Gram-positive bacteria, filamentous fungi and yeasts, and is particularly effective against the most common microorganisms that contaminate cosmetic, pharmaceutical and food formulations (Staphylococcus aureus, Candida albicans, Aspergillus niger, Penicillium spp.). Its mechanism of action is based on the disruption of microbial cell membranes and the inhibition of nutrient transport and energy production inside the cells, which stops microbial growth without the need for high concentrations. A distinctive feature of ethylparaben compared with other parabens is its unique balance between water solubility and antimicrobial activity: it has higher water solubility than propylparaben (its longer-chain, more lipophilic sibling) but greater biocidal potency than methylparaben (its shorter-chain, more hydrophilic sibling), making it the paraben of choice when aqueous-phase preservation with better potency than methylparaben is required, or as an intermediate component in multi-paraben preservative systems that protect complex formulations containing high concentrations of nonionic surfactants (where "micellar binding" of propylparaben can reduce its effective availability, a problem ethylparaben shows to a lesser degree because of its lower lipophilicity).

At Quimiconsult, located in San Nicolás de los Garza, Nuevo León, we distribute Ethylparaben USP with nationwide coverage, professional formulation technical support, certificates of analysis for every batch, and up-to-date technical data sheets (TDS) and safety data sheets (SDS), serving **pharmaceutical laboratories, cosmetic formulators, food plants, personal care product manufacturers, veterinary laboratories, supplement manufacturers, canning and jam plants, dressing and sauce manufacturers, juice and beverage plants, meat processors and product developers throughout Mexico.

The Paraben Family at Quimiconsult — Preservatives for Cosmetics, Pharmaceuticals and Food

Quimiconsult offers a complete family of parabens covering all available options so each formulator can select the optimal ester according to the required solubility, the formulation phase to be preserved, the desired antimicrobial activity profile and the regulations that apply to the final product. Each paraben has specific properties determined by the length of its alkyl chain, which defines its relative solubility in water vs. oil, its biocidal potency and its affinity for different phases in a formulation:

• Methylparaben USP (CAS 99-76-3): the most hydrophilic paraben in the family, with high solubility in water and low solubility in oil. Ideal as an aqueous-phase preservative in cosmetics, pharmaceuticals and water-soluble formulations. It is the most commonly used paraben, often in combination with propylparaben for complete protection. Typical concentrations: 0.1-0.3% in the final formulation. Food code E-218.
• Ethylparaben USP (CAS 120-47-8) — the product described on this page: an intermediate paraben between methylparaben and propylparaben, with a unique balance between water solubility (higher than propyl) and biocidal potency (higher than methyl). It is used in formulations that require a balance between water solubility and broader antimicrobial activity, as an intermediate component in multi-paraben preservative systems that exploit synergies between three esters of different chain lengths, and as a food preservative still authorized under European regulations (E-214) in conditions where propylparaben (E-216, withdrawn in 2006) is no longer an option. Typical concentrations: 0.05-0.2% in the final formulation.
• Propylparaben USP (CAS 94-13-3): a paraben with greater lipophilicity than methylparaben and ethylparaben, with high affinity for the oil phase. Ideal as an oil-phase preservative in cosmetic emulsions, creams and lotions, and as a complement to methylparaben for dual aqueous-oil phase preservation. Typical concentrations: 0.02-0.1% in the final formulation. Food code E-216 (food use withdrawn in the EU since 2006).

Selecting among these parabens —and especially the synergistic combination of several— is a standard strategy in cosmetic, pharmaceutical and food formulation. The classic binary combination is methylparaben + propylparaben (typically 0.18% + 0.02% in a 9:1 ratio), where methylparaben protects the aqueous phase while propylparaben protects the oil phase. For formulations that require reinforced protection or face an especially high microbial load, the ternary combination of methylparaben + ethylparaben + propylparaben exploits the synergy between three esters of different chain lengths, where ethylparaben provides intermediate coverage that reinforces the aqueous phase with greater potency than methylparaben alone, while complementing the oil-phase protection of propylparaben. For formulations with high concentrations of nonionic surfactants where micellar binding affects propylparaben, increasing the proportion of ethylparaben in the preservative system can compensate for the reduced availability of the more lipophilic ester.

Technical Specifications and Physicochemical Properties of Ethylparaben USP

The Ethylparaben USP we sell at Quimiconsult meets the rigorous specifications of the USP (United States Pharmacopeia) monograph and is compatible with BP, EP and JP, verified by a Certificate of Analysis (CoA) for every batch, ensuring consistent purity and antimicrobial performance in every delivery. The certified technical properties are as follows:

• Appearance: fine white powder.
• Color: white (no yellowish or gray tones).
• Odor and taste: practically odorless and tasteless.
• Assay: 98.0 – 102.0% of the active ester (meets USP monograph).
• Solubility: very slightly soluble in water (approximately 0.08% at 25 °C, higher than propylparaben but lower than methylparaben), freely soluble in 95% ethanol and in methanol, also soluble in ether, acetone, propylene glycol, glycerin (when warm), fatty oils and many organic solvents.
• Acidity value: maximum 0.1 mL of 0.1 N NaOH required to turn the indicator blue (USP parameter confirming purity and a low content of residual free p-hydroxybenzoic acid).
• Heavy metals (as lead): ≤ 10 mg/kg.
• Melting point: 115-118 °C.
• Molecular weight: 166.17 g/mol.
• Molecular formula: C₉H₁₀O₃.

The most relevant functional properties of ethylparaben for use as a preservative include:

• Antimicrobial spectrum: effective against filamentous fungi (Aspergillus niger, Penicillium spp., Cladosporium, Trichophyton), yeasts (Candida albicans, Saccharomyces, Rhodotorula), and Gram-positive bacteria (Staphylococcus aureus, Streptococcus, Bacillus, Micrococcus). Moderate activity against Gram-negative bacteria (E. coli, Pseudomonas), so in formulations that require broad protection against Gram-negatives it is complemented with other compatible preservatives.
• Minimum inhibitory concentration (MIC): typically 100-400 ppm against fungi, 400-800 ppm against Gram-positives, and >800 ppm against Gram-negatives depending on the specific microorganism. The MIC of ethylparaben is intermediate between that of methylparaben (higher) and propylparaben (lower), consistent with its intermediate lipophilicity.
• Intermediate water solubility: approximately 0.08% at 25 °C, which is twice that of propylparaben (~0.04%) and approximately one third that of methylparaben (~0.25%). This gives it a practical advantage in aqueous formulations where the goal is to preserve the water phase with greater potency than methylparaben alone, without resorting to propylparaben, which requires more careful pre-dissolution because of its very low water solubility.
• Stability over a wide pH range: optimal antimicrobial activity at pH 4-8, remaining effective up to pH 9. At very high alkaline pH (>10) ester hydrolysis can occur, gradually reducing activity.
• Thermal stability: stable up to typical processing temperatures (70-80 °C); it can be added to the hot phases of emulsions without significant loss of activity.
• Compatibility with most ingredients used in cosmetics, pharmaceuticals and food: compatible nonionic surfactants (with less micellar binding than propylparaben), vegetable and mineral oils, glycerin, propylene glycol, butylene glycol, alcohols, polymers (with verification), pigments, fragrances, vitamins.
• Non-volatile, non-flammable under normal conditions (its flash point is high because of its solid crystalline nature).
• Synergy with other parabens and with other preservatives: combining parabens of different alkyl chain lengths provides complete protection in multiphase formulations, allowing lower individual concentrations with higher overall preservative efficacy.

Synonyms, Chemical Names and Search Terms Related to Ethylparaben

In the industrial cosmetic, pharmaceutical and food market, Ethylparaben USP is known by many chemical names, trade names and regulatory nomenclatures depending on the region and application. The most widely used terms include ethylparaben or ethyl paraben (in English, dominant in international technical literature), etilparabeno, etil parabeno, ethyl ester of para-hydroxybenzoic acid, ethyl ester of 4-hydroxybenzoic acid, ethyl PHB, ethyl PHB ester, ethyl 4-hydroxybenzoate, ethyl p-hydroxybenzoate, aseptoform E, nipagin A (historical trade name), nipazol, and in INCI (International Nomenclature of Cosmetic Ingredients) nomenclature as Ethylparaben. In the food sector it is listed as additive E-214 in European regulations, where its food use remains authorized at specific regulated concentrations (unlike propylparaben E-216, whose food use was withdrawn in the EU in 2006).

Likewise, in purchasing, procurement, formulation and product development it is common to find searches such as ethylparaben price, buy ethylparaben, ethylparaben USP Mexico, ethylparaben cosmetics, pharmaceutical ethylparaben, paraben preservative, food grade ethylparaben, E-214 preservative, preservative for cream, preservative for syrup, preservative for juices, preservative for canned foods, paraben for aqueous phase, ethylparaben dosage, ethylparaben solubility, pharmaceutical grade preservative, ethylparaben nipagin A, ethylparaben supplier Mexico, ethylparaben Monterrey, bulk ethylparaben, ethylparaben price per kilo, ethylparaben vs methylparaben, ethylparaben vs propylparaben, paraben combination, methyl ethyl propyl paraben blend, triple paraben preservative or intermediate paraben. These variations are especially relevant for cosmetic formulators, pharmaceutical chemists, food technologists, juice and canned food manufacturers, personal care product developers, food plant technicians, laboratory purchasing managers and other professionals who need to identify the specific ester for their formulations.

Antimicrobial Mechanism of Action of Ethylparaben

Ethylparaben exerts its bacteriostatic and fungistatic action (inhibition of microbial growth, as opposed to bactericidal or fungicidal action that directly kills the microorganism) through a multifaceted mechanism that affects several cellular functions simultaneously:

Penetration by passive diffusion: thanks to its intermediate lipophilicity (higher than methylparaben but lower than propylparaben), ethylparaben diffuses passively across microbial cell membranes with balanced efficiency, reaching the microbial cytoplasm predictably. This intermediate penetration is advantageous against microorganisms with membranes of variable permeability.

Disruption of cytoplasmic membranes: once incorporated into the membrane, ethylparaben alters the selective permeability of the microbial membrane, causing leakage of potassium and magnesium ions, amino acids and other intracellular components essential for microbial metabolism and reproduction.

Inhibition of membrane transport: it blocks specific transport systems in the membrane, preventing the uptake of nutrients (sugars, amino acids, ions) needed for growth and reproduction.

Inhibition of membrane enzymes: it interferes with membrane-associated enzymes involved in energy production (ATPases) and in the synthesis of cellular components.

Disruption of the proton gradient: it affects the transmembrane electrochemical gradient that microbial cells use for energy production, compromising metabolic viability.

This combined mechanism results in inhibition of microbial growth and reproduction at low concentrations, allowing formulations to be preserved throughout their shelf life without requiring toxic concentrations. The activity spectrum of ethylparaben is complementary to those of methylparaben and propylparaben, which is why binary (methyl + propyl) or ternary (methyl + ethyl + propyl) combinations provide complete protection in multiphase formulations with efficacy greater than the arithmetic sum of the individual components, a phenomenon known as preservative synergy.

Industrial Applications of Ethylparaben USP

Ethylparaben USP is one of the most regulatorily versatile antimicrobial preservatives, since it remains authorized for use in cosmetics, pharmaceuticals and food in most international markets, including the European Union (where the food use of propylparaben was withdrawn but that of ethylparaben remains in force under regulation). The main fields of application are detailed below.

Food Industry — Ethylparaben's Distinctive Application

This is one of the applications where ethylparaben has a specific regulatory advantage over other parabens. As food additive E-214 it remains authorized under European regulations, in Mexico (COFEPRIS under specific regulations) and in many other markets, while its sibling propylparaben (E-216) was withdrawn as a food additive in the EU in 2006. This regulatory standing makes it one of the parabens of choice for food preservation in markets with European regulations or European regulatory influence:

• Processed meat products: sauces for meats, marinades, prepared products, specific cured products (under applicable local regulations).
• Industrial sauces: pasta sauces, industrial tomato sauce (ketchup), Worcestershire sauce, soy sauce, meat sauces, industrial hot sauces with extended shelf life.
• Jellies, jams and fruit preserves: antifungal protection of sugary products throughout their shelf life, especially when sugar content and water activity alone are not enough to ensure microbiological stability.
• Canned vegetables and pickles: pickled chiles, gherkins, olives, vegetables in brine.
• Dressings: industrial mayonnaise, creamy dressings, salad dressings in emulsified systems with extended shelf life.
• Juices and non-carbonated beverages: pasteurized fruit juices, nectars, fruit drinks, functional beverages in formulations where local regulations allow the use of parabens.
• Bakery products with extended shelf life: some industrial baked goods (check specific regulations).
• Filled bakery products: when the sugary filling is susceptible to fungal contamination.

Important: the food use of ethylparaben is subject to each country's specific regulations, which may be updated periodically, with maximum permitted concentrations by food product category. We recommend that our customers check the specific current regulations (COFEPRIS in Mexico, FDA in the U.S., EFSA in Europe, local health authorities in other markets) before incorporating ethylparaben into food formulations intended for sale in specific markets.

Cosmetics and Personal Care Industry

In cosmetics and personal care products, ethylparaben works as an antimicrobial preservative for the aqueous phase (where its intermediate water solubility is an advantage over propylparaben) and as an intermediate component in multi-paraben systems:

• Facial and body moisturizing creams: especially in formulations with a large aqueous phase or nonionic surfactant systems where micellar binding of propylparaben is problematic.
• Body and facial lotions: preservative in O/W (oil-in-water) emulsions with an optimized balance.
• Hair products: shampoos, conditioners, hair masks, leave-in treatments, styling products — where potent aqueous-phase preservation is a priority.
• Facial toners and liquid cosmetic solutions: especially in predominantly aqueous formulations where methylparaben alone may not be sufficient.
• Face masks: in cream format as well as impregnated sheet masks and scrubs with an aqueous vehicle.
• Liquid and cream makeup: fluid foundations, concealers, long-wear products.
• Shaving products: pre- and after-shave creams, gels and balms.
• Deodorants and antiperspirants in cream and roll-on formulations.
• Bath products: gels, foams, bath salts in systems that require reinforced aqueous-phase preservation.
• Baby products: lotions, creams, children's bath products (in formulations specifically designed for this category, with concentrations controlled according to the regulations of the destination market).
• Treatment cosmetics: serums, eye contour products, anti-aging creams, depigmenting products.

Typical concentrations in cosmetics are 0.05% to 0.2% in the final formulation, generally combined with methylparaben or as an intermediate component in ternary methylparaben + ethylparaben + propylparaben systems.

Pharmaceutical Industry

In the pharmaceutical industry, ethylparaben USP is one of the established preservative excipients in liquid, semisolid and specialty formulations:

• Syrups and oral solutions: especially pediatric syrups that require preservation throughout the life of a multidose bottle without altering taste; ethylparaben has less residual bitterness at use concentrations than longer-chain parabens.
• Pharmaceutical suspensions: both aqueous and oily suspensions, where it protects against post-opening contamination.
• Pharmaceutical creams, ointments and salves: preservative in aqueous bases and pharmaceutical emulsions for topical use.
• Pharmaceutical gels: hydrogels and emulgels where aqueous-phase preservation with intermediate potency is advantageous.
• Ophthalmic and otic solutions: at specific regulated concentrations and with suitable buffer systems (check the specific monographs for each market).
• Nasal solutions and sprays: for preserving nasal formulations in multidose bottles.
• Excipients for compounded preparations in compounding pharmacies and galenic preparation.
• Veterinary pharmaceutical products: oral suspensions for pets, topical veterinary products.

Typical concentrations in pharmaceuticals are 0.05% to 0.2% depending on the dosage form and the phase to be protected.

Veterinary Products Industry

In veterinary medicines and products, ethylparaben is used for purposes similar to human pharmaceuticals: antimicrobial preservation of liquid and semisolid formulations:

• Veterinary oral suspensions for pets and production animals.
• Topical veterinary products: antiparasitic shampoos, lotions, creams, sprays.
• Animal care products: colognes, conditioners, hygiene products.
• Veterinary injectable pharmaceutical formulations (in specific USP grades, according to regulations).

Typical concentrations: 0.05-0.2%.

Cleaning, Maintenance and Specialty Products Industry

In household and industrial cleaning products with long shelf lives, ethylparaben is used to preserve aqueous and emulsified formulations against microbial contamination during storage and use:

• Concentrated liquid detergents.
• All-purpose and surface cleaners.
• Surface care products.
• Household maintenance products.
• Automotive care products (dashboard cleaners, polishes, detailing products).

Raw Materials and Specialized Applications Industry

• Preservation of raw materials and derivatives: plant extracts, hydrosols, natural gums, liquid gelatins, polymer solutions.
• Water-based adhesives: where microbiological preservation is required during storage.
• Polymer emulsions and latex for the paints and coatings industry.
• Laboratory bioformulations: preservation of cell cultures, culture media and biological reagents at specific concentrations.

Characteristics and Competitive Advantages of Ethylparaben USP

The preference for ethylparaben over other antimicrobial preservatives is based on a combination of technical, regulatory and economic properties that have made it one of the industry's standard preservatives for decades:

• Broad antimicrobial spectrum, especially effective against molds, yeasts and Gram-positive bacteria.
• Documented natural occurrence in plants, fruits and vegetables, which supports its safety profile and allows a certain "natural" marketing narrative (although the commercial grade is chemically synthesized).
• Long record of documented safe use over decades in cosmetics, pharmaceuticals and food.
• Unique balance between water solubility and biocidal potency: intermediate water solubility (~0.08%) significantly higher than propylparaben (~0.04%), which makes it easier to incorporate into predominantly aqueous formulations, and greater biocidal potency than methylparaben.
• Less affected by micellar binding in systems with high nonionic surfactant content compared with propylparaben, maintaining greater effective availability as a preservative.
• Current food regulatory standing: as E-214 it remains an authorized food additive under European regulations, a status propylparaben (E-216) lost in 2006. This makes it one of the few parabens with current food use in European and European-regulated markets.
• Synergy with other parabens (especially methylparaben and propylparaben), allowing effective preservative systems to be formulated at low concentrations.
• Chemical stability over a wide pH range (4-8) and at moderate temperatures (up to 70-80 °C).
• Broad compatibility with most cosmetic, pharmaceutical and food ingredients.
• No detectable odor or taste at use concentrations, so it does not affect the organoleptic properties of the final product, a critical property in food and beverage applications.
• Non-volatile, it is not lost during processing or storage.
• Does not stain or alter the color of the product.
• Guaranteed pharmacopeial quality: meets USP, BP, EP and JP monographs for pharmaceutical applications.
• Global availability and broad regulatory backing (FDA, COFEPRIS, international cosmetic, pharmaceutical and food authorities).
• High cost-effectiveness: required at low concentrations (0.05-0.2%), which makes the cost per kilo of formulated product very competitive.
• Compatible with INCI labeling and accepted under most cosmetic regulations worldwide.

Ethylparaben vs Methylparaben vs Propylparaben — When to Choose Each One?

Choosing among the different parabens depends on the phase to be protected in the formulation, the required antimicrobial spectrum, the necessary solubility and the regulatory framework of the destination market. This is the technical selection guide with a focus on ethylparaben:

Choose Methylparaben when: the formulation is mainly aqueous (aqueous lotions, solutions, hydrophilic gels), preservation of the aqueous phase of emulsions at lower potency is required, the most economical and globally available paraben is wanted, or formulations are being developed where maximum water solubility is critical.

Choose Ethylparaben (the product described here) when:

• Aqueous-phase preservation with greater potency than methylparaben alone is needed, without resorting to propylparaben, which requires more careful dissolution because of its very low water solubility.
• The formulation has a high concentration of nonionic surfactants (polysorbates, ethoxylated alcohols) where micellar binding reduces the effective availability of propylparaben; ethylparaben shows this problem to a lesser degree because of its lower lipophilicity.
• A reinforced ternary preservative system (methylparaben + ethylparaben + propylparaben) is being developed for complete protection in complex formulations with a high expected microbial load.
• A paraben with current food regulatory standing in the European market or markets influenced by European regulations is needed, where propylparaben (E-216) is no longer a food option but ethylparaben (E-214) is.
• Specific food applications are targeted: jellies, jams, preserves, sauces, dressings, juices and non-carbonated beverages with extended shelf life.
• Methylparaben + propylparaben is being complemented with a third, intermediate paraben for reinforced protection.

Choose Propylparaben when: the formulation is an emulsion with a significant oil phase (creams, lotions, ointments, creamy cosmetic products), specific oil-phase preservation is required, synergy with methylparaben in the classic 9:1 methylparaben:propylparaben combination is sought, or a paraben more potent than methylparaben but with a less restrictive regulatory profile than butylparaben is needed.

Choose Butylparaben when: maximum biocidal potency within the traditional linear parabens is required, the formulation is predominantly oily and is not exported to markets with specific restrictions, or the lowest possible preservative concentration is wanted.

Recommended classic combinations

• Standard cosmetic binary: 0.18% methylparaben + 0.02% propylparaben (9:1 ratio), complete aqueous-oil phase protection for conventional emulsions.
• Reinforced aqueous binary: 0.15% methylparaben + 0.05% ethylparaben, for predominantly aqueous formulations containing nonionic surfactants where reinforced potency in the aqueous phase is required.
• Maximum-protection ternary: 0.12% methylparaben + 0.05% ethylparaben + 0.02% propylparaben, a triple system for complex formulations with three protected phases and maximum synergy.
• Food (where regulations allow): ethylparaben (E-214) as the main or complementary component in preservative systems for juices, sauces, preserves and dressings at the concentration regulated in each market.

For paraben-free alternatives: if the marketing strategy or specific regulations require avoiding parabens, the most common options are phenoxyethanol (similar spectrum, widely accepted), isothiazolinones (methylisothiazolinone, MIT/CMIT at regulated concentrations), benzyl alcohol, sodium benzoate + potassium sorbate (for acidic pH), ethylhexylglycerin (preservative booster), or modern multi-preservative systems.

Use, Dosage and Incorporation Recommendations for Ethylparaben

To get maximum preservative efficacy from ethylparaben in formulations, we recommend following a proper incorporation protocol that ensures complete dissolution and uniform distribution:

Pre-dissolution: although ethylparaben has higher water solubility than propylparaben (~0.08% vs ~0.04% at 25 °C), it is still "very slightly soluble in water" according to the USP monograph, so pre-dissolving it before adding it to the main formulation is recommended. The dissolution options are:

• In the hot oil phase (60-75 °C): a valid option for emulsions, although because of ethylparaben's lower lipophilicity (vs propylparaben), adding it to the hot aqueous phase may be preferable.
• In hot propylene glycol or butylene glycol: the recommended option, since ethylparaben is freely soluble in cosmetic glycols, allowing a concentrated preservative "premix" to be prepared (typically 1-5% paraben in glycol) and added to the formulation. This technique is widely used in predominantly aqueous formulations.
• In ethanol or methanol: ethylparaben is freely soluble in 95% ethanol and methanol (per the USP monograph), a useful option for hydroalcoholic formulations (toning lotions, perfumes, alcohol-based leave-on products, alcohol-based pharmaceutical products).
• In hot water: requires water at 70-80 °C and stirring; ethylparaben dissolves more easily in hot water than propylparaben thanks to its higher intrinsic water solubility. Check that it does not precipitate on cooling; in cosmetic formulations where maximum stability is sought, prefer pre-dissolution in glycol.

Typical concentrations in the final formulation

• Cosmetic creams and lotions: 0.05-0.2% (typically combined with methylparaben in binary or ternary systems).
• Shampoos and shower gels: 0.1-0.2% (especially useful when there are high concentrations of nonionic surfactants).
• Masks and creamy products: 0.05-0.15%.
• Liquid and cream makeup: 0.05-0.2%.
• Topical pharmaceutical products: 0.05-0.2% according to the specific monograph.
• Pharmaceutical syrups and suspensions: 0.05-0.2% in combination with methylparaben.
• Baby products: 0.05-0.1% (conservative low concentrations).
• Food products (where regulations apply, especially under E-214):
  • Sauces and dressings: according to the specific regulations of the market and category.
  • Jellies, jams and preserves: according to regulations.
  • Juices and non-carbonated beverages: according to regulations.
  • Processed meat products: according to specific regulations.

Point of incorporation: add the ethylparaben at the end of the formulation once the temperature has dropped to 40-50 °C or, if dissolved in the hot phase, during the emulsification process at process temperature (70-75 °C). Avoid prolonged exposure to temperatures above 80 °C, which can initiate ester hydrolysis.

Verification of preservative efficacy: once the product is formulated, we recommend performing a preservative efficacy test (Challenge Test, USP chapter <51>, EP 5.1.3) to verify that the preservative system works properly in the specific formulation. This test is mandatory in pharmaceuticals and highly recommended in cosmetics.

Ethylparaben Compatibilities and Incompatibilities

Ethylparaben is compatible with: most cosmetic, pharmaceutical and food surfactants (taking into account micellar binding at high nonionic concentrations, less of a problem than with propylparaben); vegetable oils (olive, almond, jojoba, argan, avocado, coconut); mineral oils and silicones; cosmetic esters; glycerin, propylene glycol, butylene glycol, sorbitol; compatible cosmetic polymers (carbomers, modified celluloses under suitable conditions); mineral and organic pigments; fragrances; vitamins (with specific verification); standard food ingredients (sugars, organic acids, gums, starches); other complementary preservatives (methylparaben, propylparaben, butylparaben, phenoxyethanol, benzyl alcohol, ethylhexylglycerin, potassium sorbate, sodium benzoate).

It requires special precautions with: strong bases at high temperature (concentrated NaOH, KOH at elevated temperatures), which can hydrolyze the ester and gradually reduce activity; strong oxidizing agents (concentrated hydrogen peroxide, hypochlorites, peracetic acid); nonionic surfactants at very high concentrations (polysorbates at concentrations >2-5%), which can partially sequester the paraben in micelles (a smaller effect than with propylparaben because of ethylparaben's lower lipophilicity); proteins at high concentration (casein, gelatin, soy protein), which can bind the paraben; specific starches and polysaccharides with moderate binding; some plastic materials that can absorb small amounts of paraben during prolonged storage.

Practical implication of ethylparaben's lower micellar binding: in formulations with high concentrations of nonionic surfactants (creams with 3-5% polysorbates), part of the propylparaben can become "sequestered" in micelles, reducing the effective antimicrobial concentration. Ethylparaben shows this problem to a lesser degree because of its lower lipophilicity, making it an advantageous alternative or complement in these systems.

Storage, Packaging and Shelf Life of Ethylparaben USP

Ethylparaben USP is offered in package sizes suited to different scales of industrial consumption, including bags for industrial production and smaller packs available for development, formulation and pilot testing. Specific package sizes and unit weights are available on request from our sales team.

To ensure product integrity and performance, we recommend storing it in its original tightly closed container, in a cool, dry, well-ventilated place with controlled temperature (ideally 15-25 °C), away from heat sources, moisture, direct sunlight and incompatible materials. The product is moderately hygroscopic: once opened, the container should be resealed tightly to prevent moisture absorption that could cause the powder to cake.

The shelf life of the product under these conditions is typically 36 to 60 months from the date of manufacture, one of the longest shelf lives in the chemical preservatives category. The official expiration date is always shown on the original container and on the Certificate of Analysis for the corresponding batch.

Safety, Handling and Regulatory Considerations

Ethylparaben USP is a substance with a very low toxicological profile documented over decades of safe commercial use. Typical GHS safety classifications indicate minimal hazards (mild eye and skin irritation on direct exposure to the powder, respiratory irritation from inhaling dust at high concentrations).

The recommended personal protective equipment (PPE) during industrial handling includes safety glasses to avoid eye contact with dust, general-purpose gloves to avoid prolonged skin contact, an N95 dust mask when handling large quantities in operations that generate airborne dust, and work in areas with adequate ventilation.

On the regulatory side:

• FDA: GRAS (Generally Recognized as Safe) at specific concentrations for pharmaceuticals and cosmetics. For food use, check the specific current regulations.
• COFEPRIS (Mexico): permitted as a pharmaceutical excipient, cosmetic preservative and food additive according to the regulations applicable to each product category.
• EFSA / Regulation EC 1223/2009 (European Union cosmetics): permitted in cosmetics at regulated maximum concentrations.
• EFSA (European Union food): E-214 remains authorized as a food additive at regulated maximum concentrations (unlike propylparaben E-216, whose food use was withdrawn in 2006). Check the specific maximum concentrations by food product category.
• USP, BP, EP, JP: official monographs as a pharmaceutical excipient.
• CIR (Cosmetic Ingredient Review): has assessed ethylparaben as safe for use in cosmetics at traditional concentrations.

For empty containers and waste: dispose of according to current legislation. It is not hazardous waste under most regulations at typical use quantities.

International Regulatory Trends on Parabens — Ethylparaben's Position

In the interest of technical transparency, it is important to mention that parabens have been the subject of regulatory and scientific discussion in recent years because of studies investigating possible effects as weak endocrine disruptors. The current regulatory reality is nuanced and favorable to ethylparaben within the family:

• Methylparaben and Ethylparaben: remain accepted without special restrictions under most international regulations (FDA, EFSA, COFEPRIS, JP) for cosmetic and pharmaceutical as well as food use at traditional concentrations. Ethylparaben retains its authorization as food additive E-214 in the European Union.
• Propylparaben: permitted in cosmetics and pharmaceuticals with a regulated maximum concentration in some markets (notably the EU: 0.14% individually or 0.8% for the sum of propyl + butylparaben). Food use withdrawn in the EU since 2006.
• Butylparaben and Isobutylparaben: European cosmetic restrictions similar to propylparaben; prohibited as food additives in the EU.
• Isopropylparaben, Pentylparaben, Benzylparaben: prohibited in European cosmetics since 2014 for lack of sufficient safety assessment data (not because of evidence of harm, but because of insufficient cosmetic safety data).

Ethylparaben's advantageous position: the full standing of ethylparaben in cosmetic, pharmaceutical AND food applications makes it the paraben of choice when a preservative with the broadest regulatory backing within the family is required, especially for formulations intended for markets with European regulations or influenced by them.

For customers who prefer alternatives to parabens as part of a "paraben-free" marketing strategy, we offer advice on alternative preservatives such as phenoxyethanol, isothiazolinones (with regulatory verification), sodium benzoate, potassium sorbate and other modern preservative systems.

Certifications and Regulatory Compliance

The Ethylparaben USP we distribute meets the official monographs of the USP (United States Pharmacopeia), compatible with the BP (British Pharmacopoeia), EP (European Pharmacopoeia) and JP (Japanese Pharmacopoeia), ensuring suitability for pharmaceutical, cosmetic and food applications under specific regulations. Each batch comes with a Certificate of Analysis (CoA) documenting the critical parameters: appearance, color, solubility, acidity value, assay (% purity) and heavy metals.

Where applicable to the specific batch and supplier, complementary certifications are offered such as Kosher, Halal, Non-GMO, a TSE/BSE statement (free of animal origin), and regulatory support for inclusion in pharmaceutical, cosmetic and food dossiers, subject to availability of the requested grade.

Formulators, regulatory departments, development chemists and quality assurance teams can request complementary technical documentation such as the technical data sheet (TDS), safety data sheet (SDS), specific statements, analytical methods and technical support for their operating records, health registrations and cosmetic or food notifications.

Frequently Asked Questions about Ethylparaben USP

What is ethylparaben and what is it used for?

Ethylparaben is the ethyl ester of para-hydroxybenzoic acid, a member of the paraben family, antimicrobial preservatives widely used in cosmetics, pharmaceuticals and food. It works as a bacteriostatic and fungistatic agent, especially effective against molds, yeasts and Gram-positive bacteria. It is used to preserve products against microbial contamination throughout their shelf life, especially in creams, lotions, shampoos, pharmaceutical syrups, suspensions, juices, sauces, preserves, jellies, jams, dressings, veterinary products and cosmetic and pharmaceutical formulations in general. It is one of the few parabens that retains full authorization for food use (E-214) in the European Union.

What is the difference between ethylparaben and propylparaben?

The difference is the length of the ester's alkyl chain, which determines solubility, biocidal potency and regulatory profile:

• Ethylparaben (ethyl chain, 2 carbons): higher water solubility (~0.08% at 25 °C), intermediate biocidal potency, retains E-214 food authorization in the EU.
• Propylparaben (propyl chain, 3 carbons): lower water solubility (~0.04% at 25 °C), higher biocidal potency and affinity for the oil phase, food use withdrawn in the EU since 2006 (E-216).

Choose ethylparaben when: you need potent aqueous-phase preservation, your formulation has high concentrations of nonionic surfactants, your product is going to a market with European food regulations, or you are developing a ternary preservative system. Choose propylparaben when: your emulsion has a significant oil phase that requires specific preservation.

What is the difference between ethylparaben and methylparaben?

The main difference is biocidal potency and the solubility/efficacy balance:

• Methylparaben (methyl chain, 1 carbon): higher water solubility (~0.25% at 25 °C), lower biocidal potency, the most widely used paraben globally, more economical.
• Ethylparaben (ethyl chain, 2 carbons): intermediate water solubility (~0.08% at 25 °C), greater biocidal potency than methylparaben, ideal when the goal is to reinforce aqueous-phase protection with a more effective paraben.

It is common to use both in combination to take advantage of methyl's higher solubility and ethyl's greater potency.

Can ethylparaben be used in food?

Yes, ethylparaben has current authorization as food additive E-214 under European regulations (unlike propylparaben E-216, withdrawn in 2006), in Mexico (COFEPRIS under specific regulations), in the United States (FDA under certain categories), and in many other international markets. It is used in sauces, jellies, jams, preserves, dressings, juices, processed meat products and other foods at maximum concentrations regulated by product category. Important: specific regulations vary by country and food category; check with the corresponding health authority (COFEPRIS, FDA, EFSA, etc.) the maximum concentrations permitted for your specific application before incorporating it into a formulation intended for sale.

At what concentration is ethylparaben used in cosmetics?

The typical concentration of ethylparaben in cosmetics is 0.05% to 0.2% in the final formulation, generally combined with other parabens in binary (methylparaben + ethylparaben) or ternary (methylparaben + ethylparaben + propylparaben) systems for complete protection. Under European regulations (Regulation EC 1223/2009) the maximum permitted individual concentration is the standard one for parabens. In Mexico and Latin American markets it remains permitted at traditional concentrations under standard cosmetic regulations.

Why are methylparaben, ethylparaben and propylparaben combined?

Because each paraben has specific affinities for the different phases of a formulation, and combining them exploits antimicrobial synergies that allow lower individual concentrations with higher overall preservative efficacy:

• Methylparaben (most hydrophilic): protects the aqueous phase.
• Ethylparaben (intermediate): reinforces the aqueous phase with greater potency and provides coverage in systems with nonionic surfactants where propylparaben suffers micellar binding.
• Propylparaben (most lipophilic): protects the oil phase.

The ternary combination (typically 0.12% methyl + 0.05% ethyl + 0.02% propyl) is an advanced strategy in cosmetic and pharmaceutical formulation with a high microbial load or complexity.

How is ethylparaben dissolved?

Ethylparaben is freely soluble in 95% ethanol and methanol according to the USP monograph, and very slightly soluble in water (~0.08% at 25 °C). The incorporation options are: (1) dissolution in ethanol or methanol for hydroalcoholic formulations (toners, perfumes); (2) preparing a premix in hot propylene glycol or butylene glycol at 1-5% for addition to the main formulation (the most common technique in cosmetics); (3) dissolution in hot water at 70-80 °C with stirring (easier than with propylparaben thanks to ethylparaben's higher water solubility); (4) incorporation into the hot oil phase during emulsification for creamy systems.

Is ethylparaben safe? What do the regulations say?

Ethylparaben has a record of safe use documented over decades in cosmetic, pharmaceutical and food products. International regulatory authorities (FDA, COFEPRIS, EFSA, CIR Cosmetic Ingredient Review) have repeatedly assessed the safety of ethylparaben and continue to authorize its use at regulated concentrations. Unlike other parabens whose uses have been restricted (propylparaben lost its food authorization in the EU in 2006, isopropylparaben has been prohibited in EU cosmetics since 2014), ethylparaben retains full authorization in cosmetics, pharmaceuticals and food in most international markets, which positions it as one of the parabens with the strongest regulatory profile.

Can ethylparaben be used in baby products?

Yes, under specific regulations and at controlled concentrations, ethylparaben is used in some baby products (creams, lotions, children's bath products) at low concentrations (typically 0.05-0.1%). Important: in the European Union, certain parabens are restricted in leave-on cosmetic products intended for application to the diaper area of children under 3 years of age; ethylparaben generally remains authorized, but maximum concentrations may vary by category. For formulations specifically intended for babies or young children, we recommend checking the specific regulations of the destination market before incorporating it.

What is the difference between ethylparaben USP and technical grade ethylparaben?

Ethylparaben USP meets the rigorous specifications of the USP (United States Pharmacopeia) monograph: purity 98.0-102.0%, heavy metals ≤10 mg/kg, controlled acidity value, absence of specific impurities. It is suitable for pharmaceutical, cosmetic and food use in markets that accept the USP standard. Technical grade ethylparaben may have lower purity and a higher impurity content, and is NOT certified for regulatorily demanding pharmaceutical, cosmetic or food applications. At Quimiconsult we distribute only Ethylparaben USP to ensure suitability for regulated professional applications.

How can I verify that ethylparaben works as a preservative in my formulation?

Through a Preservative Efficacy Test (PET, Challenge Test) according to the official monographs USP chapter <51> or EP 5.1.3. This test consists of inoculating the formulated product with specific microbial strains (Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Candida albicans, Aspergillus niger) and monitoring the reduction in microbial load over 28 days. The preservative system is effective if it achieves the specified minimum microbial reduction at the established time points. This test is mandatory in pharmaceuticals and highly recommended in cosmetics, especially before launching new products.

Where can I buy Ethylparaben USP in Mexico and at what price?

At Quimiconsult we distribute Ethylparaben USP with availability from our warehouse in San Nicolás de los Garza, Nuevo León, serving customers throughout Mexico. We offer packages from laboratory samples to industrial bags, with complete technical documentation (USP CoA, TDS, SDS) and formulation technical support. We also distribute Methylparaben USP, Propylparaben USP and Butylparaben USP for formulators who need the complete paraben family or combined preservative systems. The price of Ethylparaben USP depends on volume, packaging and end application. Request a personalized quote stating your estimated volume, application sector and required specifications through our website or by phone at +52 (81) 8105 0063.

Request Your Quote for Ethylparaben USP or the Complete Paraben Line

Does your pharmaceutical laboratory, cosmetics plant, personal care product manufacturer, veterinary product formulator, food plant, sauce and dressing manufacturer, juice and beverage plant, preserves and jam manufacturer, meat processor, or any industry that requires a pharmaceutical grade antimicrobial preservative with broad regulatory backing in cosmetics, pharmaceuticals and food need to incorporate Ethylparaben USP into its formulations? We also offer Methylparaben USP, Propylparaben USP and Butylparaben USP from the complete paraben family so you can implement the binary or ternary combinations that are standard in cosmetic, pharmaceutical and food formulation worldwide. Contact us and we will gladly review your specific application, recommend the optimal preservative combination for your formulation, provide regulatory advice for your destination market, and offer you a complete solution that includes full technical documentation, certifications (USP, Kosher, Halal, Non-GMO as required and available), formulation and incorporation advice, and timely delivery anywhere in Mexico.

Tel: +52 (81) 8105 0063 | WhatsApp: +52 1 (81) 3270 0334 | Web: quimiconsult.com | Address: Privada El Encino No. 750, Col. LaGrange, San Nicolás de los Garza, N.L., Mexico, CP 66490

Related Products and the Paraben Family

Discover our complete family of parabens and antimicrobial preservatives for cosmetic, pharmaceutical, food and personal care formulations:

• Methylparaben USP — hydrophilic paraben with maximum water solubility, classic combination with ethylparaben and propylparaben
• Propylparaben USP — lipophilic paraben for oil-phase preservation in emulsions
• Potassium Sorbate — preservative for acidic systems (formulations with pH < 6)
• Sodium Benzoate — preservative for acidic systems, complementary to sorbate
• Citric Acid — acidulant and sequestrant complementary to preservatives
• Glycerin USP — humectant and solubilizer for parabens
• Propylene Glycol USP — preferred solvent for paraben premixes

Related categories:

• Category: Preservatives and Antimicrobials
• Category: Paraben Family
• Category: Cosmetic Raw Materials
• Category: Food Preservatives (E-214 and derivatives)
• Category: Supplies for the Beverage and Canning Industry