What is 2-mercapto-3-butanol?
2-mercapto-3-butanol (CAS Number: 54812-86-1) is a synthetic organic compound belonging to the class of sulfur-containing flavor compounds. The molecule contains a thiol group (-SH) and a hydroxyl group (-OH), which contribute to its sensory properties. This compound is manufactured through chemical synthesis and is used in the food industry as a flavoring agent or flavoring adjuvant—meaning it may be used alone or combined with other flavoring substances to achieve desired taste and aroma profiles.
The compound is classified as a synthetic flavoring substance rather than a natural flavoring, as it does not occur naturally in food sources but is produced through chemical processes.
Common Uses
2-mercapto-3-butanol is employed in food manufacturing to provide specific flavor notes in various products. Sulfur-containing flavor compounds like this one are often used to create savory, meaty, or umami-type flavor profiles in processed foods. While specific commercial products containing this ingredient are proprietary information held by manufacturers, this type of compound is typically found in:
- Savory snacks and seasonings
- Meat and poultry flavorings
- Processed meat products
- Gravy and sauce preparations
- Soup and broth products
- Other specialty food applications
The actual concentration used in food products would be minimal, as flavoring compounds are effective at very low levels—typically parts per million (ppm).
Safety Assessment
According to available FDA records, 2-mercapto-3-butanol has generated zero reported adverse events and zero recalls. This suggests either limited market use or, more likely, a strong safety record in commercial food applications.
The compound is not currently listed on the FDA's Generally Recognized as Safe (GRAS) list, which means it has not undergone the specific GRAS determination process. However, the lack of GRAS status does not inherently indicate a safety concern—rather, it may reflect limited application, market preference for alternative flavoring agents, or manufacturers choosing different regulatory pathways for approval.
For flavoring substances not on the GRAS list, manufacturers typically maintain safety documentation and may petition the FDA for food additive approval, or the substance may be used under FDA's flavor approval framework if it meets established guidelines for synthetic flavoring substances.
The absence of reported adverse events and recalls is a positive indicator, particularly for a compound that has been in use in the food supply. Most flavoring compounds are used at extremely low concentrations, which contributes to their favorable safety profiles.
Regulatory Status
2-mercapto-3-butanol is not currently GRAS-listed with the FDA. However, it may be used as a food additive under other regulatory frameworks. In the United States, synthetic flavoring substances can be used if they comply with FDA regulations for food additives (Title 21, Code of Federal Regulations).
International regulatory status may vary. The European Food Safety Authority (EFSA) maintains its own list of approved flavoring substances, and this compound's status in European markets should be verified independently.
Manufacturers using this ingredient in food products are responsible for ensuring compliance with applicable regulations in their respective markets and for maintaining appropriate safety documentation.
Key Studies
Limited published scientific literature is readily available specifically addressing 2-mercapto-3-butanol's safety profile in peer-reviewed journals. This is not unusual for niche synthetic flavoring compounds with limited commercial applications.
The safety evaluation of such compounds typically relies on:
- Structure-activity relationship (SAR) analysis comparing the compound to similar approved flavoring substances
- Toxicological data from manufacturers
- Historical use data and absence of adverse event reports
- Quantitative estimates of daily intake based on typical usage levels in food
The zero adverse event reports from FDA databases represent the best available post-market surveillance data for consumer safety.