# 2-thienyl Mercaptan

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**Safety rating:** UNKNOWN
**CAS number:** 7774-74-5
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

2-thienyl mercaptan is an organosulfur compound used as a flavoring agent in food products. It provides savory, meaty, and sulfurous flavor notes in various processed foods and beverages. The compound has not been formally approved by the FDA as a Generally Recognized as Safe (GRAS) substance.

## Regulatory status

| Country | Status |
| --- | --- |
| United States | approved |
| European Union | not_evaluated |
| United Kingdom | approved |
| Canada | approved |
| Australia | approved |
| Japan | approved |
| South Korea | approved |
| Brazil | approved |
| China | approved |
| India | approved |

## Detailed analysis

## What is 2-thienyl Mercaptan?

2-thienyl mercaptan, with CAS number 7774-74-5, is an organosulfur heterocyclic compound consisting of a thiophene ring with a mercaptan (-SH) functional group attached. The thiophene ring is a five-membered aromatic ring containing sulfur, while the mercaptan group is responsible for the compound's characteristic pungent, sulfurous odor. This chemical structure is fundamental to its flavor characteristics and sensory properties in food applications.

## Common Uses

2-thienyl mercaptan is employed as a flavoring agent or flavor adjuvant in the food industry. Its primary applications include:

- Processed meat products, where it contributes savory and meaty flavor notes
- Meat-flavored snacks and seasonings
- Savory prepared foods and ready-to-eat meals
- Cheese and dairy flavoring formulations
- Broth-based and bouillon products
- Beer and alcoholic beverage flavoring

The compound is typically used in very small concentrations (parts per million range) to achieve desired flavor profiles without creating off-flavors. As a flavor adjuvant, it enhances existing flavor systems rather than serving as a primary flavor component.

## Safety Assessment

According to FDA records, there have been zero adverse events reported in association with 2-thienyl mercaptan, and zero product recalls have been attributed to this substance. This absence of reported incidents suggests a benign safety profile in typical food applications at permitted levels.

However, it is important to note that this compound has not been formally designated as GRAS (Generally Recognized as Safe) by the FDA. This does not necessarily indicate a safety concern; rather, it reflects that formal GRAS affirmation has not been pursued or established through the standard regulatory pathway. Many flavor compounds operate in food supply without formal GRAS designation, particularly when used in established formulations at levels considered safe based on historical use patterns.

The sulfur-containing nature of this compound is not unusual in food flavoring—many accepted flavoring substances contain sulfur functional groups. These compounds have been part of food systems for decades without establishing significant safety concerns at typical use levels.

## Regulatory Status

2-thienyl mercaptan is not listed as a GRAS substance by the FDA. However, it may be permitted for use in food under FDA regulations for flavoring substances and adjuvants that have acceptable safety documentation, or under the threshold of regulation for substances used in food. The regulatory framework for flavor compounds in the United States does not require pre-approval of every flavoring chemical when proper safety documentation exists.

The European Food Safety Authority (EFSA) has not published a formal safety assessment specific to this compound in publicly available records, though organosulfur flavoring compounds as a class have undergone evaluation under EFSA's flavor evaluation program.

## Key Studies

Limited published scientific literature exists specifically examining 2-thienyl mercaptan's safety profile in isolation. The compound's evaluation typically occurs within broader assessments of organosulfur flavor compounds by flavor industry safety evaluation committees. Such evaluations generally consider: absorption and metabolism patterns of similar sulfur compounds, historical use patterns in food, typical exposure levels, and comparative data from structurally related flavor substances that have established safety records.

The absence of reported adverse events and recalls in FDA databases, combined with decades of use in food products, provides evidence of practical safety at levels used in food flavoring applications.

## Sources

- FDA Substances Added to Food (CFSAN)
- OpenFDA Adverse Event Reporting System (AERS)
- OpenFDA Food Recalls
- EFSA OpenFoodTox
- EU Food Additive Portal

## Citation

Additive Facts. "2-thienyl Mercaptan — Safety, regulation, and evidence." https://additivefacts.com/additives/2-thienyl-mercaptan. Accessed 2026-05-20.