Ethyl lactate

Ethyl Lactate: A Comprehensive Reference

1. Identity and Chemical Characterization

Chemical Names and Identifiers

Ethyl lactate is an ester derived from lactic acid and ethanol. It is chemically identified as an ester with the molecular formula CH₃CH(OH)CO₂CH₂CH₃. Its molecular formula is C₅H₁₀O₃, and it has a molecular weight of 118.13 g/mol. It is registered under CAS number 97-64-3 and carries FEMA number 2440. Synonyms include ethyl 2-hydroxypropanoate, ethyl (S)-2-hydroxypropanoate (for the naturally occurring form), lactic acid ethyl ester, actylol, acytol, and Eusolvan.

This compound is a chiral molecule, meaning it exists in two mirror-image forms, or enantiomers. The production process determines the form of the final product. Ethyl lactate sourced from natural processes, such as the fermentation of sugars from biomass, typically yields the ethyl (−)-L-lactate or (S)-lactate form. Alternatively, ethyl lactate can be produced synthetically through the esterification of lactic acid and ethanol, which often results in a racemic mixture containing both enantiomers.

Physical and Chemical Properties

In its pure form, it is a clear, colorless liquid characterized by a mild, buttery, or creamy odor with subtle hints of fruit and coconut. Ethyl lactate has a boiling point of approximately 154°C (309°F) and a melting point of −25°C, which indicates that it remains a liquid over a wide temperature range, making it suitable for various applications. Ethyl lactate has a relatively high flash point (46°C or 115°F), which contributes to its safety in handling compared to more volatile solvents.

The compound is miscible with water and most organic solvents. This ability to mix with a wide variety of substances contributes significantly to its utility as a solvent. In the presence of water, acids, and bases, the chemical will hydrolyse into ethanol and lactic acid. The odor threshold is reported to be 0.89 mg/m³ and the odor nuisance threshold to be 65 mg/m³.

Natural Sources and Occurrence

Ethyl lactate is reported to be found in apple, citrus fruits, pineapple, peas, sauerkraut, vinegar, bread, beer, grape brandy, rum, whisky, cider, sherry, wine, cocoa, banty beer, plum brandy, and pear brandy. In fermented beverages, it arises as a natural byproduct of microbial activity. Ethyl lactate is generated in significant quantities in wines that have undergone malolactic or secondary fermentation. It is produced from the esterification of ethyl alcohol by lactic acid, and the level slowly increases with the age of the wine.

Ethyl lactate and ethyl caproate are the main esters in fermented liquor. Lactic acid bacteria produce lactic acid and caproic acid, which esterify with ethanol to produce ethyl lactate and ethyl caproate under the action of acetobacter. Fermented sour meat also contains ethyl lactate among other ester compounds. These esters usually impart sour meat a fruit and cream aroma. The synthesis of these esters is mainly closely related to Lactobacillus, Staphylococcus, and Candida.

Production and Common Forms

Ethyl lactate is derived from nature-based feedstocks — it is synthesized through the esterification reaction between ethanol and lactic acid, both reactants generated from biomass raw materials — and can be used in place of several environment-damaging halogenated and toxic solvents. Both lactic acid and ethanol are produced by microbial fermentations of carbohydrates, including starchy and cellulosic agricultural wastes. Microorganisms producing lactic acid in significant quantities are very diverse and include bacteria, fungi, and microalgae. Industrially, high tolerance of yeast and Lactobacillus strains to low pH made them more suitable for the production of lactic acid by the fermentation of carbohydrate sources.

Common commercial forms include food-grade liquid (used as a flavoring agent), USP/pharmaceutical-grade liquid (used in topical formulations and as a pharmaceutical solvent), industrial-grade liquid (used as a green solvent in coatings and cleaning), and cosmetic-grade liquid (used in lotions, creams, and shampoos). The 88% purity USP grade is used in food, pharmaceutical, and some industrial applications. Ethyl lactate is used in some cosmetic formulations in soaps, detergents, creams, and lotions with a maximum concentration of 0.2%.

2. Traditional and Historical Use

Role as a Naturally Occurring Fermentation Compound

Although ethyl lactate has not been used as a deliberately isolated supplement in traditional medicine systems, it has been present in fermented foods and beverages consumed by humans across many cultures for millennia. Ethyl lactate is generated in significant quantities in wines that have undergone malolactic or secondary fermentation. It is therefore a constituent of traditionally fermented products including wine, beer, vinegar, cider, and aged spirits, which were consumed not only for pleasure but historically for perceived health and medicinal purposes.

Ethyl lactate is a constituent of California and Spanish sherries. Its presence in fermented dairy products such as sauerkraut and yogurt-type foods, as well as in bread and vinegar, indicates that human dietary exposure to the compound has been continuous across all historical cultures that practiced fermentation.

Early Pharmaceutical and Dermatological Use

The first deliberate pharmaceutical use of ethyl lactate identified in the peer-reviewed literature dates to the 1970s, when it was investigated as an active ingredient in topical dermatological preparations for acne vulgaris. German-language studies from the mid-1970s examined formulations based on ethyl lactate and ethanol in film masks, measuring their effects on skin surface lipids as a criterion for therapeutic efficacy. A clinical evaluation of topical ethyl lactate treatment for acne vulgaris was conducted by Grosshans, Fourtanier, and Guibaud, published in the Annales de Dermatologie et de Vénéréologie in October 1978. This represented the first clinical-trial-level investigation of ethyl lactate as a pharmaceutical ingredient.

3. Key Constituents, Active Compounds, and Mechanisms of Action

Chemical Identity as the Active Compound

Ethyl lactate is itself the primary active compound. It is a single small-molecule ester and does not contain a complex mixture of secondary metabolites in the way that plant extracts do. Its biological activity derives from its intrinsic chemical properties and, critically, from the products generated when it undergoes hydrolysis in biological tissues.

Hydrolysis to Lactic Acid and Ethanol

The central mechanism underlying virtually all of ethyl lactate's biological effects is its susceptibility to enzymatic hydrolysis. In humans, esterases readily hydrolyze ethyl lactate to relatively harmless lactic acid and ethanol. This reaction occurs in multiple biological contexts: in the gastrointestinal tract after ingestion, on the skin surface after topical application, and within sebaceous follicles. Ethyl lactate is metabolized to ethanol and lactic acid by bacterial lipases in hair follicles and sebaceous glands. Ethanol solubilizes lipids and lactic acid, and lowers the skin pH, resulting in a bactericidal effect. Both agents are short-lived in vivo.

Lipophilicity and Follicular Penetration

Ethyl lactate is liposoluble and therefore can penetrate into the adipose glands and hair follicles. It is decomposed, via lipases of the bacteria, into ethanol and lactic acid, and thus reduces the pH of the skin. This combination of lipophilicity (enabling penetration into sebum-rich follicles) with subsequent hydrolysis to antimicrobially active products represents a prodrug-like delivery mechanism, whereby ethyl lactate acts as a transport vehicle for lactic acid into the sebaceous follicle.

pH Reduction and Antibacterial Action

When applied to human facial skin, the ethyl lactate was hydrolysed to ethanol and lactic acid, and thereby lowered the skin pH. Under such conditions the growth of recoverable skin bacteria, in particular the anaerobe Propionibacterium acnes, was inhibited, and the hydrolysis of sebum to free fatty acids by lipase derived from the bacteria was greatly impaired. These effects of ethyl lactate would account for its observed clinical efficacy in acne vulgaris.

Lactic acid and sodium lactate both have a wide spectrum of antibacterial activity, and this possibly contributes significantly to the natural defence mechanisms of the skin. The pH-lowering effect from lactic acid production creates an environment hostile to anaerobic bacteria such as P. acnes (now reclassified as Cutibacterium acnes), while ethanol provides a direct lipid-solubilizing and antiseptic effect.

Skin Penetration Enhancement

Beyond its own activity, ethyl lactate has been investigated as a penetration enhancer for other active compounds. Research has disclosed that alkyl lactates, such as ethyl lactate, can be used to improve the penetration of active ingredients in skin care formulations deep into lower layers of the skin tissue. Ethyl lactate can be included in aqueous-based skin creams, such as oil-in-water emulsions, to deliver active ingredients deep into the skin structure. Ethyl lactate is particularly desirable for utilization in conjunction with skin cream formulations that contain water-soluble active ingredients, such as ascorbic acid (Vitamin C).

Metabolic Fate After Ingestion

When ingested as a food flavoring or additive, ethyl lactate is rapidly hydrolyzed in the gastrointestinal tract. The products — lactic acid and ethanol — are both normal dietary constituents and are metabolized through well-established pathways. Lactic acid enters the Cori cycle and is converted to glucose or oxidized, while ethanol follows hepatic alcohol dehydrogenase pathways. Because hydrolysis is rapid and complete, ethyl lactate itself does not accumulate in tissues.

4. Regulatory and Safety Status

GRAS Status and FDA Approval

Ethyl lactate has been classified under the "Generally Recognized as Safe" (GRAS) category by the U.S. Food and Drug Administration (FDA), indicating its safety for use in food products. It has been approved by the US FDA for food use. The compound functions as a flavoring agent and food additive, approved by the United States Food and Drug Administration (FDA).

JECFA and WHO Evaluation

Ethyl lactate has been evaluated multiple times by the Joint FAO/WHO Expert Committee on Food Additives (JECFA). JECFA found no safety concern at current levels of intake when used as a flavouring agent. The 1982 group ADI of "not specified" for lactic acid and ethyl lactate was maintained at the fifty-seventh meeting (2001). The ADI is listed as "not specified" (included in the group ADI for lactic acid). An ADI of "not specified" is assigned when the totality of available data indicates that the substance presents no hazard to health at the levels used, and when there is no need to set a numerical limit on acceptable intake. The ADI is subject to no special provisions (FAO/WHO, 1994).

5. Scientific Evidence by Area of Use

5.1 Topical Treatment of Acne Vulgaris

Evidence strength: Moderate (limited human clinical trials, well-characterized mechanism)

The most thoroughly investigated pharmaceutical application of ethyl lactate is its topical use in acne vulgaris. The body of human clinical evidence dates primarily from the late 1970s and the 1980s.

Grosshans et al. (1978) — Double-Blind Clinical Trial: The efficacy of a lotion containing 10% ethyl lactate was evaluated in a double-blind clinical trial during 8 weeks. Test subjects were 45 male and female patients with polymorphous juvenile acne. They were divided into three groups: Group A received oral antibiotic plus topical placebo lotion; Group B received oral antibiotic plus topical ethyl lactate lotion; Group C received topical ethyl lactate lotion only. The lotions were applied twice daily with a swab of cotton-wool. The antibiotic doses (tetracycline hydrochloride) were decreased as the trial progressed. Patients were examined before the trial, then after 1, 2, 4, 6 and 8 weeks. At each visit, comedones, microcysts, pustules and nodules were counted on a skin surface of 9 cm². Colour photographs were taken before and at the end of the trial and served for counting inflammatory lesions. At each visit, skin lipids were sampled and analysed by IR spectrophotometry in order to assess the effect of the treatments on the free fatty acid/triglyceride ratio. This study, published in Annales de Dermatologie et de Vénéréologie (PMID 154872), represented the first randomized controlled evaluation of ethyl lactate for acne.

Prottey et al. (1983/1984) — Mechanistic and Clinical Studies: A two-part body of research by Prottey and colleagues at Unilever Research Laboratory and the University of Liverpool examined both the mechanism and clinical efficacy of ethyl lactate. Prottey, George, Black and Vickers published "Ethyl lactate as a treatment for acne" in the British Journal of Dermatology in 1983 (volume 108, page 228). A follow-up mechanistic paper appeared in 1984: Prottey, George, Leech, Black, Howes, and Vickers published "The mode of action of ethyl lactate as a treatment for acne" in the British Journal of Dermatology, Volume 110, Issue 4, April 1984, Pages 475–485.

This mechanistic study employed both animal models and human subjects. An alcoholic lotion containing ethyl lactate, when applied topically to rat skin under occlusion, became localized in the follicles and sebaceous glands. When applied to human facial skin, the ethyl lactate was hydrolysed to ethanol and lactic acid, and thereby lowered the skin pH. Under such conditions the growth of recoverable skin bacteria, in particular the anaerobe Propionibacterium acnes, was inhibited, and the hydrolysis of sebum to free fatty acids by lipase derived from the bacteria was greatly impaired. These effects of ethyl lactate would account for its observed clinical efficacy in acne vulgaris.

Clinical Trial Design (associated patent disclosure): Forty-five subjects aged between 13 and 29 years who had been suffering from polymorphous juvenile acne for periods ranging from 6 months to 7 years were recruited for a trial. The ethyl lactate containing lotion and a placebo were applied over a period of 8 weeks. The lotions were applied twice daily with a cotton pellet; no other cleansing product was used during the test period. A count of acne lesions of all types over a skin area of 9 cm² in a severely affected site on the face or back was made by two dermatologists.

Limitations: The human clinical trials for ethyl lactate in acne were conducted in the late 1970s and early 1980s using study designs and reporting standards that precede modern requirements for randomized controlled trials. The most systematic trials were relatively small (45 patients) and in some cases published only in non-English-language journals. No large, independently replicated, placebo-controlled randomized trials meeting contemporary standards have been identified in the published literature. The Prottey et al. 1984 mechanistic paper is cited in dermatology guidelines and references (including the Dermatological Society of Singapore's acne management guidelines published in the Journal of Clinical and Aesthetic Dermatology), indicating acceptance of the mechanism, though the evidence base for clinical efficacy remains modest by modern standards.

Ethyl lactate has been proposed to be effective in the treatment of acne due to its ability to penetrate into the sebaceous follicle ducts, lower pH, and decrease the formation of fatty acids.

5.2 Antimicrobial Activity (Topical)

Evidence strength: Preliminary (mechanistic/in vitro data; limited formal clinical trials)

It has been discovered that compositions based on alkyl lactate esters have antibacterial properties. Alkyl lactates are non-toxic and biodegradable. They are widely used as food additives, in pharmaceuticals, and cosmetics. The antimicrobial mechanism, as established by the Prottey group's research, is indirect: ethyl lactate hydrolyzes to produce lactic acid, which lowers local pH, and ethanol, which solubilizes lipids — together inhibiting skin flora.

The veterinary product Etiderm shampoo (Virbac) contains 10% ethyl lactate for antimicrobial and antiseborrheic effects. The existence of a licensed veterinary preparation at a defined concentration (10%) reflects institutional acceptance of the antimicrobial efficacy at this concentration.

Laboratory studies have revealed that lactic acid and sodium lactate both have a wide spectrum of antibacterial activity. However, direct antimicrobial clinical trials of ethyl lactate formulations in humans beyond the acne context are limited; the available evidence is primarily mechanistic and laboratory-based.

5.3 Flavoring and Food Applications

Evidence strength: Well-established (regulatory acceptance; extensive use history)

The compound functions as a flavoring agent and food additive, approved by the United States Food and Drug Administration (FDA). Its mild, fruity, and creamy aroma enhances the flavor profile in various food products, including baked goods, confectionery items, and dairy.

Ethyl lactate (FEMA# 2440, CAS# 97-64-3), also known as ethyl 2-hydroxy propionate, is generated in significant quantities in wines that have undergone malolactic or secondary fermentation. It has an aroma that is undeniably attractive, soft and fruity. Unlike many other flavor chemicals, ethyl lactate does not figure highly amongst the character recognition components of any flavors. Nevertheless, it does perform a stellar role in many flavors by adding complexity.

5.4 Pharmaceutical Solvent and Transdermal Delivery Vehicle

Evidence strength: Preliminary (patent and formulation literature; limited clinical data)

Ethyl lactate's lipophilicity, low toxicity, and biodegradability have attracted interest as a pharmaceutical excipient and solvent. Ethyl lactate is a potential alternative to acetonitrile in reversed-phase liquid chromatography due to its greener nature. It has also been found to be a suitable solvent for extracting bioactive compounds from plants.

In the domain of drug delivery, ethyl lactate has been explored as a penetration enhancer and excipient in topical formulations. The deep penetration property of certain alkyl lactates is well known. Human data on transdermal pharmacokinetics of ethyl lactate as a drug delivery vehicle are limited to patent disclosures and small formulation studies; no independently published clinical pharmacokinetic trials were identified.

6. Body Systems and Health Areas Associated with Ethyl Lactate

Integumentary System (Skin and Appendages)

This is the most extensively studied body system for ethyl lactate's deliberate biological application. Its follicular penetration properties, hydrolytic generation of lactic acid, and resulting skin-pH modulation and bacteriostatic/bactericidal effects have been characterized in both animal models and human skin. Applications include acne treatment, antiseborrheic therapy, and use as a skin penetration enhancer.

Lactic acid is a component of the normal skin-surface chemistry, and laboratory studies have revealed that lactic acid and sodium lactate both have a wide spectrum of antibacterial activity. Being produced by the skin itself, lactic acid is not expected to cause any allergic or toxic reactions.

Gastrointestinal System

When ingested, ethyl lactate is rapidly cleaved by esterases in the gastrointestinal tract to ethanol and lactic acid. Both hydrolysis products are normal physiological metabolites. The WHO/JECFA evaluation established that the compound poses no safety concern at current intake levels via food. In the presence of water, acids and bases the chemical will hydrolyse into ethanol and lactic acid. The compound's established metabolic fate renders it of minimal distinct biological interest as an oral supplement per se.

Microbial/Antimicrobial Context

When applied to human facial skin, ethyl lactate was hydrolysed to ethanol and lactic acid, and thereby lowered the skin pH. Under such conditions the growth of recoverable skin bacteria, in particular the anaerobe Propionibacterium acnes, was inhibited, and the hydrolysis of sebum to free fatty acids by lipase derived from the bacteria was greatly impaired. This antimicrobial action is relevant both to skin health (acne) and potentially to veterinary medicine, where a licensed product with 10% ethyl lactate is already marketed.

7. Dosage Forms and Dosages Reported in Studies

Topical Acne Lotion

• A lotion containing 10% ethyl lactate, applied twice daily with a swab of cotton-wool, was used in an 8-week double-blind clinical trial.
• An ethyl lactate-containing lotion was applied to subjects over a period of 8 weeks, twice daily with a cotton pellet; no other cleansing product was used during the test period.
• Etiderm shampoo (Virbac) contains 10% ethyl lactate for antimicrobial and antiseborrheic effects.

Cosmetic Preparations

• Ethyl lactate is used in some cosmetic formulations in soaps, detergents, creams and lotions with a maximum concentration of 0.2%.

Topical Antiseptic Formulations (Patent Literature)

• A method comprising topical application of a composition wherein the concentration of ethyl lactate is between about 2% and about 50% by volume was described for skin antiseptic use.
• A method for reducing the bacterial count of the skin comprising applying topically to the skin surface a composition with at least one alkyl ester of lactic acid in concentrations between 10% and about 20% by volume was described.

Flavoring Use

• Dose rates cited for ethyl lactate as a flavor ingredient are at levels to be used in flavors intended to be dosed at 0.05% in ready-to-drink beverages or bouillon.
• At lower levels around 100 ppm, ethyl lactate has a subtle but very natural fresh juice effect in lemon flavors.
• In grape flavors, 2,000 ppm is cited as a reasonable level to try.

8. Safety Considerations

Acute Toxicity Data

Ethyl lactate demonstrates no corrosive, mutagenic, carcinogenic, or teratogenic properties. The LD₅₀ values of ethyl lactate exceed 2000 mg/kg (rats, oral or dermal administration). The LC₅₀ value of ethyl lactate inhaled by rats for 4 hours is greater than 5400 mg/m³. The LD₅₀ is 2500 mg/kg in mice (oral). These values place ethyl lactate in a low-toxicity category by standard regulatory classifications.

Genotoxicity, Reproductive Toxicity, and Repeated-Dose Assessments

Ethyl lactate was evaluated for genotoxicity, repeated-dose toxicity, reproductive toxicity, local respiratory toxicity, phototoxicity/photoallergenicity, skin sensitization, and environmental safety. The existing information supports the use of this material as described in this safety assessment (RIFM Fragrance Ingredient Safety Assessment, Expert Panel).

WHO/FAO ADI Classification

No safety concern was found at current levels of intake when used as a flavouring agent. The 1982 group ADI of "not specified" for lactic acid and ethyl lactate was maintained at the fifty-seventh meeting (2001). The ADI is listed as "not specified" — included in the group ADI for lactic acid. The FAO/WHO 1994 evaluation likewise confirmed: ADI is subject to no special provisions.

Biodegradability and Environmental Profile

The biodegradation of ethyl lactate occurs readily (75% in 28 days) producing water and carbon dioxide. This compound is readily biodegradable and is considered environmentally friendly due to its low toxicity and low potential for bioaccumulation.

Potential Adverse Effects at High or Occupational Exposure

Inhalation or dermal exposure to high concentrations may cause irritations, such as mild eye or skin irritation. Ingestion of large amounts may lead to gastrointestinal discomfort. However, these effects are typically observed at levels significantly higher than those encountered in normal use or environmental exposures.

Hydrolysis Products and Their Safety Implications

Because the primary metabolic and chemical fate of ethyl lactate is hydrolysis to ethanol and lactic acid, the safety profile of any exposure is largely governed by these products rather than by ethyl lactate itself. Lactic acid is a normal human metabolite; ethanol is a widely consumed dietary compound subject to established metabolic pathways, though it carries its own pharmacological profile at elevated doses. At the levels present from typical flavoring or cosmetic use, the quantities of ethanol generated from ethyl lactate hydrolysis are negligible.

Skin Sensitization

Being produced by the skin itself, lactic acid is not expected to cause any allergic or toxic reactions. The RIFM Expert Panel evaluation, which assessed skin sensitization specifically among other toxicological endpoints, found that the existing information supported its use as described. No evidence of contact sensitization potential was identified in the literature reviewed.

Drug and Ingredient Interactions

No specific pharmacokinetic drug–drug interactions with ethyl lactate as an oral supplement or topical ingredient have been identified in the peer-reviewed literature. As a topical penetration enhancer, ethyl lactate may alter the rate of skin absorption of co-formulated actives; this is considered a desirable property in pharmaceutical formulation but should be accounted for in combined product design. Research indicates that alkyl lactates such as ethyl lactate can improve the penetration of active ingredients in skin care formulations deep into the lower layers of skin tissue, and ethyl lactate can be included in aqueous-based skin creams to deliver active ingredients deep into the skin structure. The practical implication is that formulations combining ethyl lactate with potent or sensitizing actives may achieve greater-than-anticipated dermal absorption.

9. Summary of Evidence Quality

Ethyl lactate's status as a naturally occurring compound with a well-characterized chemical identity and a clear metabolic fate distinguishes it from many dietary supplement ingredients with diffuse or contested mechanisms. Its safety profile — including FDA GRAS status for food use, a WHO/JECFA "ADI not specified" designation, and a well-defined low-toxicity rodent profile — is among the most extensively reviewed of any flavoring ester. Its role in acne treatment is supported by a mechanistically coherent account (follicular penetration → hydrolysis → pH reduction → bacteriostasis), two small clinical trials from the late 1970s and early 1980s, and acknowledgment in clinical dermatology guidelines. However, the absence of large, modern randomized controlled trials means that its clinical evidence for acne does not meet current standards for strong efficacy claims. Its use as a flavoring agent, solvent, and cosmetic excipient is well-established by regulatory precedent rather than clinical endpoint studies. Researchers and clinicians should interpret the acne data as preliminary but biologically plausible, with no safety contraindications identified at studied concentrations.

References

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• Grosshans E, Fourtanier A, Guibaud B. "[Clinical evaluation of a topical ethyl lactate treatment of acne vulgaris]." Ann Dermatol Venereol. 1978 Oct;105(10):833-8. PubMed PMID: 154872
• Gloor M. "[Studies of the treatment of acne vulgaris using ethyl lactate. Effect of the effective agent and alcoholic base on lipids of the skin surface]." Arzneimittelforschung. 1977;27(11):2179-81. PubMed PMID: 123890
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