FlavScents AInsights Entry for Gamma-Terpinene (CAS: 99-85-4)
1. Identity & Chemical Information
- Common Name(s): Gamma-terpinene
- IUPAC Name: 1-methyl-4-(propan-2-ylidene)cyclohexene
- CAS Number: 99-85-4
- FEMA Number: 3559
- Other Identifiers: FL No. 02.062
- Molecular Formula: C10H16
- Molecular Weight: 136.24 g/mol
Gamma-terpinene is a monoterpene hydrocarbon characterized by its cyclohexene ring with a methyl and an isopropylidene group. The presence of these functional groups contributes to its distinct citrus-like odor, which is significant in both flavor and fragrance applications.
Citation hooks: FlavScents; PubChem; FEMA
2. Sensory Profile
Gamma-terpinene is known for its fresh, citrusy aroma with a slight herbal undertone. It is often described as having a moderate intensity and good diffusion properties, making it a versatile component in both flavor and fragrance formulations. The odor threshold is relatively low, allowing it to impart a noticeable impact even at minimal concentrations. In flavor systems, it serves as an impact note, enhancing the freshness and authenticity of citrus profiles.
Citation hooks: FlavScents; peer-reviewed sensory literature
3. Natural Occurrence & Formation
Gamma-terpinene is naturally found in a variety of essential oils, including those of citrus fruits, cumin, and coriander. It is typically formed through the enzymatic degradation of limonene and other related terpenes. Its presence in natural sources qualifies it for use in products labeled as containing "natural flavors" or "natural fragrances."
Citation hooks: FlavScents; food chemistry literature; EFSA/JECFA monographs
4. Use in Flavors
Gamma-terpinene is widely used in flavor formulations, particularly in citrus and herbal profiles. It acts as a functional enhancer, providing freshness and depth to the overall flavor system. Typical use levels in finished food or beverage products range from 0.5 to 10 ppm, with higher concentrations used in more robust applications. It is generally stable under typical processing conditions, though it may be susceptible to oxidation, which can alter its sensory characteristics.
Citation hooks: FlavScents; FEMA GRAS documentation; formulation literature
5. Use in Fragrances
In the fragrance industry, gamma-terpinene is utilized across various fragrance families, including citrus, herbal, and spicy compositions. It functions as a modifier and impact note, contributing to the top and middle notes of a fragrance. Typical concentration ranges vary, but it is often used at levels of 0.1% to 1% in the final product. Its volatility allows it to provide an initial burst of freshness, which is highly valued in personal care and household products.
Citation hooks: FlavScents; IFRA; fragrance chemistry texts
6. Regulatory Status (Regional Overview)
- United States: Recognized as GRAS by FEMA for flavor use.
- European Union: Listed under Regulation (EC) No 1334/2008 with an assigned FL number.
- United Kingdom: Follows EU regulations post-Brexit with no significant divergence reported.
- Asia: Approved for use in Japan and China, with specific concentration limits in certain applications.
- Latin America: Generally accepted in Brazil and MERCOSUR countries, though specific regulations may vary.
Gamma-terpinene is broadly approved for use in both flavor and fragrance applications, with harmonized assumptions across major markets. However, formulators should verify specific regional requirements to ensure compliance.
Citation hooks: FEMA; EFSA; national authority publications
7. Toxicology, Safety & Exposure Considerations
Gamma-terpinene is considered safe for use in food and fragrance applications when used within recommended limits.
- Oral Exposure: The acceptable daily intake (ADI) is not explicitly defined, but it is generally recognized as safe under typical use conditions.
- Dermal Exposure: It is not a primary irritant or sensitizer, but IFRA guidelines should be consulted for specific product types.
- Inhalation Exposure: Due to its volatility, occupational exposure limits should be observed in manufacturing settings to prevent respiratory irritation.
The risk profiles for food and fragrance applications are similar, with no significant differences noted in safety assessments.
Citation hooks: EFSA; FEMA; PubChem; toxicology literature
8. Practical Insights for Formulators
Gamma-terpinene is valued for its ability to enhance freshness and authenticity in both flavors and fragrances. It synergizes well with other citrus and herbal components, providing a balanced and natural profile. Formulators should be cautious of its oxidation potential, which can lead to off-notes. It is often under-utilized in complex formulations where its subtle impact can be overshadowed by more dominant ingredients.
Citation hooks: FlavScents; industry practice
9. Confidence & Data Quality Notes
The data on gamma-terpinene is well-established, with comprehensive sensory and regulatory information available. While industry practices are generally documented, some regional regulatory nuances may require further verification. Known data gaps are minimal, but ongoing research may provide additional insights into its broader applications and safety profiles.
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 2026-03-03 15:55:15 GMT (p2)