What is 2-nonanol?
2-nonanol (CAS Number 628-99-9) is a secondary aliphatic alcohol with nine carbon atoms in its molecular chain. It exists as a colorless to pale yellow liquid with a characteristic fruity and floral aroma. This compound occurs naturally in small quantities in various fruits, vegetables, and essential oils, making it part of the flavor profile of many foods found in nature.
The compound is chemically designated as 2-nonananol or methyl heptyl carbinol. Its structure consists of a nine-carbon backbone with a hydroxyl group (-OH) attached at the second carbon position, which defines its chemical properties and sensory characteristics.
Common Uses
2-nonanol is employed in the food industry primarily as a flavoring agent and flavor adjuvant. It is used in small concentrations to enhance or create fruity, floral, and woody flavor notes in various food and beverage applications. Common uses include:
- Alcoholic beverages (liqueurs, spirits, and craft beverages)
- Non-alcoholic beverages (fruit juices and flavored drinks)
- Baked goods and bread products
- Confectionery and candy items
- Dairy products and flavored milk
- Savory food applications in limited quantities
Typical usage levels are very small, measured in parts per million (ppm), as flavoring agents require only minimal quantities to achieve desired sensory effects.
Safety Assessment
According to FDA records, there are no reported adverse events associated with 2-nonanol, and no food recalls have been linked to this ingredient. This absence of documented safety incidents suggests a favorable safety profile in food applications at typical use levels.
The compound's safety is supported by several factors: its natural occurrence in foods, its structural similarity to other approved flavoring alcohols, and the very low concentrations at which it is used in food products. When used as a flavoring agent at appropriate levels, exposure is minimal and far below any threshold of concern.
Toxicological studies on similar aliphatic alcohols with comparable structures have generally shown low toxicity profiles when ingested at food-relevant concentrations. The body can readily metabolize short- to medium-chain alcohols through established biochemical pathways.
Regulatory Status
2-nonanol is not listed as Generally Recognized as Safe (GRAS) by the FDA, which means it has not undergone the formal GRAS determination process. However, this designation does not indicate safety concerns; rather, it reflects that a formal GRAS petition may not have been submitted or completed.
The ingredient may be used in food products under FDA regulations for flavoring substances, though manufacturers should ensure compliance with applicable food additive regulations and labeling requirements in their respective jurisdictions.
In the European Union, similar flavoring substances are evaluated by the EFSA (European Food Safety Authority) under the EU flavoring regulation framework. International regulatory approaches to 2-nonanol vary by country, and manufacturers must verify compliance with local regulations before use.
Key Studies
While comprehensive peer-reviewed toxicological studies specifically focused on 2-nonanol in isolation are limited in publicly available literature, the safety profile of structurally similar secondary alcohols has been extensively studied. Research on comparable nine-carbon and shorter-chain aliphatic alcohols supports the safety assessment of this class of compounds at food-use levels.
The natural occurrence of 2-nonanol in foods demonstrates that humans have a long history of dietary exposure to this compound at low levels without documented adverse effects. This historical food use provides supporting evidence for its safety in flavoring applications.
Additional safety data may be available in proprietary research conducted by manufacturers or in regulatory dossiers submitted to food safety authorities. The lack of adverse events or recalls in FDA records further supports the safety profile of this ingredient when used appropriately.