2-Nonenal (CAS 2463-53-8): High-Impact Flavor & Fragrance Ingredient

Chemical name:2-Nonenal

2-Nonenal (CAS: 2463-53-8, FEMA: 3213) , also known as trans-2-Nonenal, Cucumber Aldehyde, or Heptylideneacetaldehyde, is a high-purity unsaturated aldehyde widely recognized for its distinctive and powerful olfactory profile. This naturally occurring compound is found in various fruits and vegetables, particularly cucumber, melon, and watermelon, as well as in citrus peel oils, and is responsible for the characteristic fresh, green aroma associated with these products. It exhibits a complex aroma characterized by strong cucumber, fresh melon, fatty, waxy, and slightly citrus-like notes, with subtle undertones reminiscent of violet leaf and green apple.

With a molecular formula of C₉H₁₆O, 2-Nonenal presents as a colorless to pale yellow liquid at room temperature, characterized by a powerful, diffusive odor that is highly impactful even at low concentrations. The compound has a molecular weight of 140.22 g/mol, a boiling point of approximately 88-90°C at 12 mmHg, and demonstrates excellent solubility in ethanol, propylene glycol, and most organic solvents commonly used in flavor and fragrance formulations, with limited solubility in water. It is manufactured under strict quality control standards to ensure consistent purity, typically exceeding 95-98%, with rigorous batch-to-batch uniformity maintained throughout production.

In flavor applications, 2-Nonenal is extensively utilized to create authentic cucumber and melon profiles, providing the fresh, green, watery character essential to these flavor systems. It is the key aroma component in cucumber flavors, delivering the characteristic crisp, fresh cucumber note that is difficult to achieve with other ingredients. In melon formulations, including cantaloupe, honeydew, and watermelon, this aldehyde contributes the authentic green, slightly fatty undertones that enhance overall naturalness. The compound is also employed in tropical fruit profiles, such as banana, pineapple, and passion fruit, where it adds freshness and complexity. Additionally, it finds use in beverage applications, including flavored waters, sports drinks, and alcoholic beverages, as well as in confectionery, dairy products, and savory applications where fresh green notes are desired.