# Difurfuryl Ether

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> Markdown URL: https://additivefacts.com/additives/difurfuryl-ether.md

**Safety rating:** UNKNOWN
**CAS number:** 4437-22-3
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

Difurfuryl ether (CAS 4437-22-3) is an organic compound used as a flavoring agent in food products. It functions as a flavoring adjuvant to enhance or modify taste profiles in various food applications.

## 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 Difurfuryl Ether?

Difurfuryl ether is an organic chemical compound with the CAS number 4437-22-3. It belongs to the class of furan derivatives and is used in the food industry primarily as a flavoring agent or flavoring adjuvant. The compound has a molecular structure based on furan rings connected through an ether linkage, which contributes to its sensory properties in food applications.

## Common Uses

Difurfuryl ether is employed in food manufacturing as a flavoring component, typically in products requiring enhanced or modified taste characteristics. Like other furan-based flavoring compounds, it may be used in trace amounts to contribute specific flavor notes. The compound is used in various food categories where synthetic flavoring agents are permitted, though its specific applications remain limited compared to more widely used flavor compounds. Its use is primarily in industrialized food production where flavor precision and consistency are important.

## Safety Assessment

According to FDA records, there are no reported adverse events associated with difurfuryl ether, and no food recalls have been linked to this additive. This absence of reported safety incidents suggests a reasonable safety profile in actual food use. However, the lack of extensive safety data reflects the compound's relatively limited use in the food supply compared to more common additives.

The compound has not received FDA GRAS (Generally Recognized As Safe) status, which indicates that it has not undergone the formal GRAS notification process with the FDA. GRAS status is not a requirement for all food additives, and its absence does not necessarily indicate safety concerns. Rather, it may reflect limited commercial interest in pursuing formal GRAS designation or use in markets where such designation is not required.

## Regulatory Status

Difurfuryl ether operates within a regulatory framework that varies by jurisdiction. In the United States, the FDA regulates flavoring agents under 21 CFR Part 182 and related sections. While not GRAS-listed, the compound may be used in foods under other regulatory pathways or in jurisdictions with different approval mechanisms.

In the European Union, flavoring compounds are regulated under Regulation (EC) No 1334/2008. The regulatory approach to flavor compounds differs between regions, and approval in one jurisdiction does not automatically translate to approval in another.

Manufacturers using difurfuryl ether must comply with all applicable food safety regulations in their operating regions and ensure proper labeling and documentation of ingredient use.

## Key Studies

Scientific literature specifically examining difurfuryl ether's safety profile appears limited in publicly available databases. The absence of extensive published toxicological studies is consistent with compounds in limited commercial use. The lack of reported adverse events in FDA databases and the absence of safety recalls provide empirical evidence that the compound has not caused documented harm in food applications.

Furan-based compounds have been studied more broadly in food safety contexts, particularly regarding thermal degradation products in foods. However, difurfuryl ether as a deliberately added ingredient functions differently from incidental furan compounds formed during cooking or processing.

Any manufacturer considering use of this additive should ensure compliance with current food safety regulations and maintain documentation supporting safe use levels and 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. "Difurfuryl Ether — Safety, regulation, and evidence." https://additivefacts.com/additives/difurfuryl-ether. Accessed 2026-05-19.