# 2-butyrylfuran

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> Markdown URL: https://additivefacts.com/additives/2-butyrylfuran.md

**Safety rating:** UNKNOWN
**CAS number:** 4208-57-5
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

2-butyrylfuran is a synthetic flavoring compound used to impart buttery and caramel-like notes in food products. It is not currently approved as Generally Recognized as Safe (GRAS) by the FDA but has no reported adverse events or recalls associated with its use.

## Regulatory status

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

## Detailed analysis

## What is 2-butyrylfuran?

2-butyrylfuran (CAS Number: 4208-57-5) is a synthetic organic compound belonging to the furan class of flavor chemicals. It is a colorless to pale yellow liquid with a molecular formula of C₈H₁₀O₂. The compound consists of a furan ring—a five-membered aromatic ring containing one oxygen atom—with a butyroyl (four-carbon acyl) side chain attached. This chemical structure is responsible for its characteristic sensory properties.

## Common Uses

2-butyrylfuran is employed as a flavoring agent in the food industry to create or enhance buttery, caramel, and roasted notes in various food products. It is particularly valued in applications where these flavor profiles are desired, including baked goods, dairy products, confectionery, and savory snacks. The compound contributes to the overall flavor complexity of processed foods by mimicking naturally occurring flavor compounds found in butter and caramelized foods.

As a synthetic flavoring agent, 2-butyrylfuran is used in very small quantities—typically measured in parts per million—to achieve the desired sensory effect without significantly impacting the product's nutritional profile or other characteristics.

## Safety Assessment

The safety profile of 2-butyrylfuran is not extensively documented in public databases. The FDA has not granted this compound GRAS (Generally Recognized as Safe) status, which means it does not have the regulatory recognition afforded to some other flavoring compounds. However, the absence of GRAS status does not indicate the compound is unsafe; rather, it indicates that such a determination has not been formally established through the FDA's review process.

Notably, there are zero reported adverse events associated with 2-butyrylfuran in the FDA's adverse event reporting system, and no product recalls have been attributed to this ingredient. This absence of reported safety incidents suggests the compound has not raised significant public health concerns in real-world use.

The limited publicly available toxicological data for 2-butyrylfuran means that a comprehensive safety assessment would require review of proprietary industry studies, if they exist. Furan-based compounds generally have been studied for safety, though individual compounds within this class can have different toxicological profiles.

## Regulatory Status

In the United States, 2-butyrylfuran does not have FDA GRAS approval. This means it may only be used in food products under the Food Additive Petition (FAP) process if a petition has been submitted and approved, or under other applicable regulatory pathways. The regulatory status in other jurisdictions, including the European Union's approval for use as a flavor substance, may differ from U.S. regulations.

Manufacturers seeking to use this ingredient in food products must comply with applicable food additive regulations in their target markets. The compound's regulatory classification as a "flavoring agent or adjuvant" indicates its intended function in food preparation and formulation.

## Key Studies

Publicly available peer-reviewed literature specifically addressing 2-butyrylfuran is limited. Most safety information for synthetic flavoring compounds comes from a combination of structure-activity relationship (SAR) analysis, in vitro testing, and animal studies conducted by manufacturers as part of regulatory submissions.

For comprehensive safety information about this ingredient, interested parties should consult the flavor industry's FEMA (Flavor and Extract Manufacturers Association) GRAS program documentation, if applicable, or contact manufacturers directly. The absence of published adverse event data reflects both the compound's limited controversy and the proprietary nature of much flavor chemistry research.

## 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-butyrylfuran — Safety, regulation, and evidence." https://additivefacts.com/additives/2-butyrylfuran. Accessed 2026-05-19.