Ethylene Glycol Monophenyl Ether

Ethylene Glycol Monophenyl Ether, commonly known by its chemical name 2-Phenoxyethanol, is an organic compound with the CAS number 122-99-6. Its chemical formula is C8H10O2. In its pure form, it appears as a colorless, slightly viscous liquid with a faint, pleasant odor often described as rose-like, honey-like, or green. This characteristic aroma is why it finds application in the food industry.

While predominantly synthetically produced for commercial uses, 2-Phenoxyethanol can also be found in trace amounts in certain natural products, such as green tea, chicory, and grapefruit, highlighting its natural presence in some plant matter. Beyond its role in food, Ethylene Glycol Monophenyl Ether is widely utilized in various other industries. It serves as a common preservative in cosmetics, personal care products, and pharmaceutical formulations due to its broad-spectrum antimicrobial properties. It is also employed as a solvent for inks, resins, dyes, and as an antiseptic in some medical applications. Its versatile chemical properties and favorable safety profile at relevant concentrations contribute to its diverse applications.

In the context of food, its primary function is as a flavoring agent or an adjuvant. As a flavoring agent, it is directly responsible for imparting or modifying a specific taste or aroma. As an adjuvant, it helps another substance perform its function, often by stabilizing flavors or acting as a solvent in flavor formulations.

In the food industry, Ethylene Glycol Monophenyl Ether is utilized as a flavoring agent or adjuvant to contribute specific aromatic notes to a wide array of products. Its subtle rose-like, honey-like, or green-fruity nuances make it valuable in creating complex flavor profiles. It can be found in formulations for confectionery, baked goods, beverages (alcoholic and non-alcoholic), dairy products, and certain savory items, where it helps to enhance or round out the overall flavor experience.

Due to its potent aroma, it is used at very low concentrations in food flavorings, ensuring that it provides the desired aromatic contribution without dominating the product's natural taste. Its role as a flavor adjuvant often involves it acting as a solvent or carrier for other flavor compounds, ensuring their even distribution and stability within a food matrix.

Beyond food, Ethylene Glycol Monophenyl Ether has extensive non-food applications. In the cosmetics and personal care industry, it is a ubiquitous preservative found in lotions, creams, makeup, shampoos, and soaps, preventing microbial growth and extending product shelf life. In pharmaceuticals, it is used as a preservative in vaccines and ophthalmic solutions. As a solvent, it is employed in industrial settings for lacquers, inks, and resins. The broad spectrum of its uses underscores its established chemical properties and the extensive safety data available across different exposure routes.

The safety of Ethylene Glycol Monophenyl Ether has been extensively reviewed by various national and international regulatory and scientific bodies. Toxicological studies indicate that the compound is readily absorbed, metabolized, and excreted from the body. Once absorbed, it is primarily metabolized through conjugation with glucuronic acid and sulfate, facilitating its elimination.

Acute toxicity studies generally classify Ethylene Glycol Monophenyl Ether as having low oral and dermal toxicity. Repeated dose toxicity studies in laboratory animals (rats and mice) have identified target organs such as the kidneys, liver, and hematopoietic system, but only at very high exposure levels significantly exceeding typical human dietary intake. Genotoxicity testing, including standard assays like the Ames test and chromosomal aberration tests, has consistently shown it to be non-genotoxic. Similarly, available carcinogenicity studies have not indicated carcinogenic potential. Reproductive and developmental toxicity studies have also concluded that Ethylene Glycol Monophenyl Ether does not cause significant adverse effects on reproduction or development at doses relevant to human exposure.

Based on comprehensive toxicological data, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) in 2005 established an Acceptable Daily Intake (ADI) of 0-3 mg per kilogram of body weight per day for Ethylene Glycol Monophenyl Ether. This ADI was derived from a No Observed Adverse Effect Level (NOAEL) of 300 mg/kg body weight per day from a 90-day rat study, applying a standard safety factor of 100. The European Food Safety Authority (EFSA) subsequently confirmed this ADI in its own evaluations. Dietary exposure estimates from its use as a flavoring agent indicate that typical intake levels are well below the established ADI, suggesting a wide margin of safety.

While some individuals may exhibit contact sensitization to 2-Phenoxyethanol, particularly from topical cosmetic applications, dietary exposure routes and levels are fundamentally different and generally do not pose the same risk for sensitization.

**United States (FDA):** The U.S. Food and Drug Administration (FDA) has not specifically listed Ethylene Glycol Monophenyl Ether in its official GRAS (Generally Recognized As Safe) regulations (21 CFR Part 182 or 184). However, it is recognized as Generally Recognized As Safe (GRAS) by the Flavor and Extract Manufacturers Association (FEMA) under FEMA GRAS No. 3574 for its use as a flavoring agent. FEMA GRAS determinations are based on expert panels and are widely accepted by the FDA for flavor ingredients, effectively establishing its safe use in food when used as intended and in accordance with good manufacturing practices. The FDA's records indicate 0 adverse events and 0 recalls associated with this additive.

**European Union (EFSA):** Ethylene Glycol Monophenyl Ether is approved for use as a flavoring substance in the European Union (EU) and is listed with the FLAVIS number 04.017. The European Food Safety Authority (EFSA), through its Panel on Food Additives, Flavourings, Processing Aids and Materials in Contact with Food (AFC Panel), evaluated its safety and affirmed its acceptability as a flavoring agent within specified usage levels, consistent with the JECFA ADI.

**International (JECFA):** The Joint FAO/WHO Expert Committee on Food Additives (JECFA) evaluated Ethylene Glycol Monophenyl Ether (Phenoxyethanol) in its 65th report (2005). JECFA assigned it to a group of flavouring agents (Group 19, subclass 3.2.1.b, linear and branched chain saturated primary alcohols and esters, and related substances) and established an Acceptable Daily Intake (ADI) of 0–3 mg/kg body weight per day, providing international guidance for its safe use as a food additive.

The safety assessment and regulatory approval of Ethylene Glycol Monophenyl Ether are founded on comprehensive scientific evaluations from leading international and national bodies. Key studies and reports include:

* **JECFA (2005):** The primary international assessment is documented in the "Evaluation of certain food additives and contaminants (sixty-fifth report of the Joint FAO/WHO Expert Committee on Food Additives)," published in WHO Food Additives Series 54. This report details the toxicological data, metabolism, and the derivation of the ADI for Phenoxyethanol, consolidating numerous underlying toxicological studies including acute, subchronic, genotoxicity, and reproductive toxicity evaluations.

* **EFSA (2005):** The European Food Safety Authority's Scientific Panel on Food Additives, Flavourings, Processing Aids and Materials in Contact with Food (AFC) published its "Opinion on a request from the Commission related to Phenoxyethanol (FL-no: 04.017)." This opinion reviewed the JECFA data and additional relevant scientific literature to confirm the ADI and endorse its safe use as a flavoring in the EU under regulated conditions. The EFSA assessment considers various endpoints, including potential for genotoxicity, carcinogenicity, reproductive and developmental toxicity, and general systemic toxicity based on chronic and subchronic studies.

These authoritative reviews consider a battery of toxicological tests, including those investigating acute oral and dermal toxicity, repeated-dose toxicity (e.g., 90-day studies in rodents to determine No Observed Adverse Effect Levels), genotoxicity (e.g., Ames test, in vitro mammalian chromosomal aberration test, in vivo micronucleus test), carcinogenicity studies, and reproductive and developmental toxicity studies. These comprehensive evaluations form the scientific basis for its continued acceptance as a safe food additive at specified levels.