AInsights Entry for Linoleic and Linolenic Acids

1. Identity & Chemical Information

• Common Names: Linoleic acid, Linolenic acid
• IUPAC Names:
  • Linoleic acid: (9Z,12Z)-octadeca-9,12-dienoic acid
  • Linolenic acid: (9Z,12Z,15Z)-octadeca-9,12,15-trienoic acid
• CAS Numbers:
  • Linoleic acid: 60-33-3
  • Linolenic acid: 463-40-1
• FEMA Numbers: Not applicable
• Other Identifiers:
  • Linoleic acid: FL No. 04.002
  • Linolenic acid: FL No. 04.003
• Molecular Formula and Weight:
  • Linoleic acid: C18H32O2, 280.45 g/mol
  • Linolenic acid: C18H30O2, 278.43 g/mol
• Functional Groups and Structure-Odor Relevance: Both acids are unsaturated fatty acids with carboxylic acid functional groups. Linoleic acid has two double bonds, while linolenic acid has three, contributing to their distinct roles in flavor and fragrance applications due to their oxidative stability and reactivity.

Citation hooks: FlavScents; PubChem; FEMA

2. Sensory Profile

• Odor and Flavor Descriptors: Linoleic acid is generally odorless but can impart a mild, fatty taste. Linolenic acid has a slightly grassy, green odor and taste, often described as fishy or beany when oxidized.
• Taste and/or Odor Thresholds: Data not found.
• Typical Sensory Role: Linoleic acid serves as a background realism note in flavor systems, while linolenic acid can act as a modifier, adding complexity to green or grassy profiles.

Citation hooks: FlavScents; peer-reviewed sensory literature

3. Natural Occurrence & Formation

• Known Natural Sources: Both acids are prevalent in plant oils, such as soybean, sunflower, and flaxseed oils. They are also found in nuts and seeds.
• Formation Pathways: These acids are biosynthesized in plants via the desaturation of oleic acid, a process catalyzed by specific desaturase enzymes.
• Relevance to “Natural Flavor” or “Natural Fragrance” Designation: Both acids are considered natural components when derived from plant sources, aligning with natural flavor and fragrance designations.

Citation hooks: FlavScents; food chemistry literature; EFSA/JECFA monographs

4. Use in Flavors

• Flavor Categories and Applications: Used in savory and snack foods, dairy products, and as a component in emulsifiers.
• Functional Role in Flavor Systems: Acts as a carrier for fat-soluble flavors and contributes to mouthfeel.
• Typical Use Levels: Industry-typical use levels range from 10 to 1000 ppm in finished products, depending on the application.
• Stability Considerations: Both acids are prone to oxidation, which can lead to off-flavors. Stability is enhanced in low-oxygen environments and with antioxidants.

Citation hooks: FlavScents; FEMA GRAS documentation; formulation literature

5. Use in Fragrances

• Fragrance Families and Product Types: Utilized in green, herbal, and marine fragrance profiles.
• Functional Role: Acts as a modifier and provides trace realism in complex fragrance compositions.
• Typical Concentration Ranges: Typically used at low concentrations, often below 0.1% in fragrance formulations.
• Volatility and Top/Middle/Base Contribution: Linolenic acid contributes to the top and middle notes due to its volatility.

Citation hooks: FlavScents; IFRA; fragrance chemistry texts

6. Regulatory Status (Regional Overview)

• United States (FDA / FEMA GRAS): Both acids are generally recognized as safe (GRAS) for use in food.
• European Union (Reg. (EC) No 1334/2008): Approved for use as flavoring substances.
• United Kingdom: Follows EU regulations post-Brexit.
• Asia (Japan, China, ASEAN): Approved for use in food and cosmetics, with specific limits varying by country.
• Latin America (e.g., Brazil, MERCOSUR): Generally approved, but specific regulations should be consulted.

Citation hooks: FEMA; EFSA; national authority publications

7. Toxicology, Safety & Exposure Considerations

• Oral Exposure: Both acids are essential fatty acids with established dietary importance. No specific ADI or MSDI is set, but they are consumed as part of a normal diet.
• Dermal Exposure: Generally considered safe for topical use, though oxidation products may cause irritation.
• Inhalation Exposure: Low volatility reduces inhalation risk, but oxidized products may pose respiratory irritation.

Citation hooks: EFSA; FEMA; PubChem; toxicology literature

8. Practical Insights for Formulators

• Why This Material is Valuable: Essential for maintaining the structural integrity of cell membranes and providing essential fatty acids in formulations.
• Typical Synergies: Works well with antioxidants to prevent oxidation.
• Common Formulation Pitfalls: Susceptible to oxidation; requires careful handling and storage.
• Situations Where It is Frequently Over- or Under-used: Often under-used in formulations requiring stability due to oxidation concerns.

Citation hooks: FlavScents; industry practice

9. Confidence & Data Quality Notes

• Well-Established Data: Extensive research on dietary roles and safety.
• Industry-Typical but Undocumented Practices: Use in fragrance is less documented but widely practiced.
• Known Data Gaps or Regulatory Ambiguities: Specific ppm thresholds in fragrances are not well-documented.

Citation hooks: FlavScents

QA Check

• All required sections 1–9 are present
• “Citation hooks:” line is present under each section
• Flavor section includes ppm ranges
• Toxicology section covers oral, dermal, inhalation
• Regulatory section mentions US, EU, UK, Asia, Latin America
• If complex natural material: includes section 5a (not applicable here)

About FlavScents AInsights (Disclosure)
FlavScents AInsights integrates information from authoritative government, scientific, academic, and industry sources to provide applied, exposure-aware insight into flavor and fragrance materials. Data are drawn from regulatory bodies, expert safety panels, peer-reviewed literature, public chemical databases, and long-standing professional practice within the flavor and fragrance community. Where explicit published values exist, they are reported directly; where gaps remain, AInsights reflects widely accepted industry-typical practice derived from convergent sensory behavior, historical commercial use, regulatory non-objection, and expert consensus. All such information is clearly labeled to distinguish documented data from professional guidance or informed estimation, with the goal of offering transparent, practical, and scientifically responsible context for researchers, formulators, and regulatory specialists. This section is generated using advanced computational language modeling to synthesize and structure information from established scientific and regulatory knowledge bases, with the intent of supporting—not replacing—expert review and judgment.

Generated 2026-04-16 18:42:10 GMT (p2)