FlavScents AInsights Entry for Lemon Oil Terpenes (CAS: 68917-33-9)

1. Identity & Chemical Information

Lemon oil terpenes are a natural complex material derived from the essential oil of lemons. They are not a single compound but a mixture of various terpenes, primarily limonene. The CAS number for lemon oil terpenes is 68917-33-9. While there is no specific FEMA number for lemon oil terpenes as a whole, limonene, a major constituent, is recognized under FEMA GRAS. Other identifiers include FL number and CoE number, which are used in regulatory contexts. The composition of lemon oil terpenes can vary significantly depending on the source, harvest time, and processing methods.

Citation hooks: FlavScents; PubChem; FEMA

2. Sensory Profile

Lemon oil terpenes are characterized by a fresh, citrusy aroma with a strong lemon note. The odor is typically described as bright and zesty, with a high intensity and excellent diffusion. In flavor applications, they provide a sharp, tangy taste that is reminiscent of fresh lemon zest. The sensory role of lemon oil terpenes is often as an impact note, providing a burst of citrus freshness in both flavor and fragrance formulations.

Citation hooks: FlavScents; peer-reviewed sensory literature

3. Natural Occurrence & Formation

Lemon oil terpenes are naturally found in the peel of lemons (Citrus limon). They are extracted through cold pressing or steam distillation of lemon peels. The formation of these terpenes occurs naturally as part of the plant's metabolic processes. Lemon oil terpenes are commonly used in products labeled as "natural flavor" or "natural fragrance" due to their direct derivation from plant sources.

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

4. Use in Flavors

Lemon oil terpenes are widely used in flavor formulations, particularly in citrus-flavored products such as beverages, candies, and baked goods. They serve as a key component in creating authentic lemon flavors. Typical use levels in finished food or beverage products range from 10 to 100 ppm, with variations depending on the desired intensity and product type. Lemon oil terpenes are generally stable under normal processing conditions but can be sensitive to oxidation, which may affect flavor quality over time.

Citation hooks: FlavScents; FEMA GRAS documentation; formulation literature

5. Use in Fragrances

In fragrance applications, lemon oil terpenes are used in a variety of product types, including perfumes, household cleaners, and personal care products. They contribute to the citrus fragrance family and are often used as a top note due to their high volatility. Typical concentration ranges in fragrance formulations are from 0.1% to 2%, depending on the product and desired scent profile. Lemon oil terpenes provide a fresh, uplifting aroma that enhances the overall fragrance composition.

Citation hooks: FlavScents; IFRA; fragrance chemistry texts

5a. Key Constituents (Typical)

Lemon oil terpenes primarily consist of limonene, which can make up to 90% of the composition. Other constituents include beta-pinene, gamma-terpinene, and citral. The exact composition can vary based on factors such as geographic origin and extraction method. It is important for formulators to verify the specific composition of lemon oil terpenes from their suppliers.

Citation hooks: FlavScents; peer-reviewed literature; authoritative industry references

6. Regulatory Status (Regional Overview)

In the United States, lemon oil terpenes are generally recognized as safe (GRAS) for use in flavors by FEMA. In the European Union, they are regulated under Regulation (EC) No 1334/2008 and have an assigned FL number. The United Kingdom follows similar regulations post-Brexit. In Asia, regulations vary, with Japan and China having specific guidelines for natural flavorings. In Latin America, countries like Brazil and those in MERCOSUR have their own regulatory frameworks, often aligning with international standards.

Citation hooks: FEMA; EFSA; national authority publications

7. Toxicology, Safety & Exposure Considerations

For oral exposure, lemon oil terpenes are considered safe within the typical use levels in food and beverages, with an acceptable daily intake (ADI) established for limonene. Dermal exposure in fragrance applications is generally safe, but high concentrations may cause irritation or sensitization in sensitive individuals. Inhalation exposure is typically low risk, but occupational exposure should be monitored to prevent respiratory irritation. The risk profiles for food and fragrance applications are generally similar, with safety measures focusing on concentration and exposure duration.

Citation hooks: EFSA; FEMA; PubChem; toxicology literature

8. Practical Insights for Formulators

Lemon oil terpenes are valued for their ability to impart a fresh, authentic citrus note. They synergize well with other citrus and floral notes, enhancing the overall complexity of the formulation. Common pitfalls include overuse, which can lead to overpowering or harsh notes, and underuse, which may result in a lack of impact. Formulators should consider the volatility and potential for oxidation when incorporating lemon oil terpenes into products.

Citation hooks: FlavScents; industry practice

9. Confidence & Data Quality Notes

The data on lemon oil terpenes is well-established, particularly regarding their sensory characteristics and regulatory status. Industry practices are well-documented, though some variability exists in composition due to natural factors. Known data gaps include specific toxicological thresholds for all constituents, which require careful consideration by formulators.

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

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 2026-07-08 07:22:13 GMT (p2)