What is (e,e)-2,4-decadien-1-ol?

(e,e)-2,4-decadien-1-ol is an unsaturated fatty alcohol, specifically a dienol, with the CAS number 18409-21-7. Its molecular formula is C10H18O. The 'e,e' in its name refers to the *trans,trans* configuration of its double bonds, indicating specific geometric isomers that influence its chemical properties and sensory profile. This compound is known for its distinct fruity aroma, often described as reminiscent of pear or apple. While it can be synthetically produced for commercial use, (e,e)-2,4-decadien-1-ol is also a naturally occurring volatile compound found in a variety of fruits, most notably pears, quinces, and sometimes apples, where it contributes significantly to their characteristic fragrance.

Common Uses

As a flavoring agent or adjuvant, (e,e)-2,4-decadien-1-ol is incorporated into a wide range of food products to either create new flavors or enhance existing ones. Its primary utility lies in its ability to impart desirable fruity notes. It is commonly found in formulations designed for:

Beverages (e.g., fruit juices, soft drinks, alcoholic beverages)
Confectionery (e.g., candies, chewing gum)
Baked goods
Dairy products (e.g., yogurts, ice cream)
Snack foods

Due to its potent aroma, (e,e)-2,4-decadien-1-ol is typically used in very small quantities, often measured in parts per million (ppm) or even parts per billion (ppb), as part of complex flavor blends. Its role is crucial in developing authentic and appealing fruity profiles in processed foods.

Safety Assessment

The safety of flavoring agents like (e,e)-2,4-decadien-1-ol is rigorously assessed by regulatory bodies worldwide. The evaluation typically considers factors such as dietary exposure levels, metabolic pathways, and toxicology studies. For (e,e)-2,4-decadien-1-ol, available data suggests that when consumed at typical use levels in food, it is considered safe. The human body generally metabolizes primary alcohols like (e,e)-2,4-decadien-1-ol through oxidation, converting them into corresponding aldehydes and carboxylic acids, which can then be further processed or excreted. In the United States, while (e,e)-2,4-decadien-1-ol is not designated as Generally Recognized As Safe (GRAS) by the FDA in the same manner as some direct food additives, it is nonetheless permitted for use. This distinction is important; a substance not having specific FDA GRAS affirmation does not imply it is unsafe. Instead, its use is authorized under different sections of the Code of Federal Regulations, indicating that the FDA has reviewed its safety data and approved its application as a synthetic flavoring substance and adjuvant under specified conditions. There have been no reported adverse events related to the consumption of (e,e)-2,4-decadien-1-ol documented by the FDA, nor have there been any FDA-mandated recalls involving this specific additive. The European Food Safety Authority (EFSA) also plays a significant role in the safety assessment of food flavorings in the European Union. EFSA's Panel on Food Additives and Flavourings (FAF) has evaluated (e,e)-2,4-decadien-1-ol as part of various flavorings groups, often applying a 'tiered approach' for risk assessment that considers exposure, structure-activity relationships, and metabolism. These evaluations often conclude that the flavoring substances pose no safety concern at estimated dietary exposures. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) also reviews flavoring agents, and their evaluations often form a basis for national regulations in many countries, contributing to the global understanding of the safety of such compounds.

Regulatory Status

United States (FDA)

In the United States, (e,e)-2,4-decadien-1-ol is approved for use as a synthetic flavoring substance and adjuvant under Title 21 of the Code of Federal Regulations (CFR), specifically 21 CFR 172.515. This regulation lists numerous synthetic flavoring substances and adjuvants that are safe for use in food when used in the minimum quantity required to produce their intended effect, and otherwise in accordance with good manufacturing practice.

European Union (EFSA)

Within the European Union, (e,e)-2,4-decadien-1-ol is included in the Union list of flavorings and has been evaluated by the European Food Safety Authority (EFSA). It is part of the FGE.10 flavoring group, which covers alpha,beta-unsaturated aliphatic alcohols, aldehydes, and related esters. EFSA's scientific opinions, such as those issued for FGE.10 Rev1 and Rev2, have concluded that this compound, along with others in its group, does not raise safety concerns at anticipated levels of intake under its intended conditions of use.

International

JECFA, the international scientific expert committee administered jointly by the Food and Agriculture Organization of the United Nations (FAO) and the World Health Organization (WHO), also includes (e,e)-2,4-decadien-1-ol in its evaluations of flavoring agents. JECFA assignments of acceptable daily intakes (ADIs) or 'no safety concern' conclusions are influential for regulatory bodies worldwide.

Key Studies

Key safety data for (e,e)-2,4-decadien-1-ol primarily stem from comprehensive evaluations by regulatory authorities like EFSA and JECFA. These assessments typically review a suite of toxicological studies, including:

**Metabolism studies:** Understanding how the body processes and eliminates the compound.
**Genotoxicity studies:** Tests to ensure the substance does not damage genetic material (DNA).
**Subchronic toxicity studies:** Longer-term animal studies to identify any adverse effects from repeated exposure.
**Estimates of exposure:** Calculating typical dietary intake levels and comparing them against established safety thresholds, often using the Threshold of Toxicological Concern (TTC) approach for flavoring substances with limited toxicological data but low exposure.

For (e,e)-2,4-decadien-1-ol, specific studies are usually cited within the comprehensive reports of EFSA and JECFA, demonstrating that it is metabolized and excreted efficiently, and does not pose genotoxic or other significant toxicological concerns at typical exposure levels. These studies collectively support its continued authorization as a food flavoring. Neither the FDA nor EFSA have indicated any need for further specific studies to address immediate safety concerns for this additive under current use conditions.

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