FlavScents AInsights Entry: Butter Starter Distillates (CAS: 91745-88-9)

1. Identity & Chemical Information

Butter starter distillates are complex natural materials derived from the distillation of fermented dairy products. They are not single chemical compounds but rather mixtures containing various volatile components. The CAS number for butter starter distillates is 91745-88-9. These distillates do not have a specific IUPAC name or molecular formula due to their complex nature. They are recognized in the flavor industry for their rich, buttery aroma and are often used to enhance dairy profiles in food products.

Citation hooks: FlavScents; PubChem; FEMA

2. Sensory Profile

Butter starter distillates are characterized by their rich, creamy, and buttery aroma, often described as reminiscent of freshly churned butter. The intensity of the odor is moderate to strong, with a high diffusion rate, making it a prominent note in formulations. These distillates are primarily used as impact notes in flavor systems, providing a realistic and authentic butter-like aroma. The taste threshold for butter starter distillates is not well-documented, but they are known to impart a smooth, creamy mouthfeel when used in flavor applications.

Citation hooks: FlavScents; peer-reviewed sensory literature

3. Natural Occurrence & Formation

Butter starter distillates are naturally derived from the fermentation of dairy products. The formation of these distillates involves the enzymatic breakdown of milk fats and proteins, followed by distillation to concentrate the volatile aroma compounds. This process is similar to the Maillard reaction, where complex flavors are developed through heat and enzymatic activity. Butter starter distillates are considered natural flavors, aligning with regulatory definitions for "natural flavor" designations.

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

4. Use in Flavors

Butter starter distillates are widely used in the flavor industry to enhance dairy profiles in a variety of food products, including baked goods, confectionery, and dairy products. They serve as functional impact notes, providing authenticity and depth to butter flavors. Typical use levels in finished food products range from 10 to 100 ppm, with variations depending on the desired intensity and product matrix. These distillates are generally stable under typical food processing conditions, although they may be sensitive to high heat and acidic environments.

Citation hooks: FlavScents; FEMA GRAS documentation; formulation literature

5. Use in Fragrances

In the fragrance industry, butter starter distillates are used to impart creamy, buttery notes to gourmand and sweet fragrance compositions. They are often employed as modifiers or trace realism notes, enhancing the richness and depth of the fragrance. Typical concentration ranges in fragrance formulations are qualitative, as they are used sparingly to achieve the desired effect. The volatility of butter starter distillates contributes to their role as top to middle notes in fragrance compositions.

Citation hooks: FlavScents; IFRA; fragrance chemistry texts

5a. Key Constituents (Typical)

Butter starter distillates typically contain a variety of volatile compounds, including diacetyl, acetoin, and butyric acid, which contribute to their characteristic buttery aroma. The composition of these distillates can vary based on the source of the dairy product, the fermentation process, and the distillation method used. It is important to note that the composition is not fixed and may differ between batches.

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

6. Regulatory Status (Regional Overview)

In the United States, butter starter distillates are generally recognized as safe (GRAS) for use in flavors by FEMA. In the European Union, they are permitted under Regulation (EC) No 1334/2008 as natural flavoring substances. The United Kingdom follows similar regulations post-Brexit. In Asia, including Japan and China, butter starter distillates are accepted as natural flavors, although specific regulations may vary. In Latin America, countries like Brazil and members of MERCOSUR recognize these distillates under harmonized flavor regulations.

Citation hooks: FEMA; EFSA; national authority publications

7. Toxicology, Safety & Exposure Considerations

The safety of butter starter distillates is primarily evaluated through oral exposure, as they are used in food products. They are considered safe for consumption within the typical use levels, with no specific ADI or MSDI established. Dermal exposure in fragrance applications is generally low risk, with no significant irritation or sensitization reported. Inhalation exposure is minimal due to their low volatility in typical use concentrations. Overall, the risk profiles for food and fragrance applications are similar, with no major safety concerns identified.

Citation hooks: EFSA; FEMA; PubChem; toxicology literature

8. Practical Insights for Formulators

Butter starter distillates are valued for their ability to impart authentic buttery notes to both flavors and fragrances. They synergize well with other dairy and creamy notes, enhancing the overall richness of the formulation. Common pitfalls include overuse, which can lead to an overpowering aroma, and underuse, which may result in a lack of depth. Formulators should carefully balance the concentration to achieve the desired sensory impact.

Citation hooks: FlavScents; industry practice

9. Confidence & Data Quality Notes

The data on butter starter distillates is well-established, with comprehensive sensory and regulatory information available. Industry practices are well-documented, although specific compositional data may vary due to the natural variability of the material. Known data gaps include precise taste thresholds and detailed toxicological profiles, which are typically addressed through industry-standard safety assessments.

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
• Includes section 5a for complex natural material

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 2026-04-27 19:43:17 GMT (p2)