# Isopropyl Propionate

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> Markdown URL: https://additivefacts.com/additives/isopropyl-propionate.md

**Safety rating:** UNKNOWN
**CAS number:** 637-78-5
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

Isopropyl propionate (CAS 637-78-5) is a synthetic flavoring agent used to impart fruity and ester-like taste notes in food products. It is not approved as a Generally Recognized As Safe (GRAS) substance by the FDA, though it has not been associated with adverse events or recalls in the United States.

## 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 Isopropyl Propionate?

Isopropyl propionate is a synthetic ester compound with the chemical formula C₅H₁₀O₂. It is classified as a flavoring agent or flavoring adjuvant in food applications. The compound consists of propionic acid esterified with isopropanol, creating a volatile organic chemical with characteristic fruity and apple-like aromatic properties. As a synthetic flavoring, it does not occur naturally in significant quantities in food sources.

## Common Uses

Isopropyl propionate is used in the food industry primarily as a flavoring agent to create or enhance fruity taste profiles in various food and beverage products. Its ester structure provides volatile aromatic compounds that contribute to flavor complexity. The compound is typically used in small quantities, as is standard practice with synthetic flavorings. Applications may include beverages, confectionery, baked goods, and other processed foods where fruity or apple-like flavor notes are desired. The specific concentration and applications depend on manufacturer formulations and regional regulatory allowances.

## Safety Assessment

According to FDA records, isopropyl propionate has not been associated with any reported adverse events or product recalls in the United States food supply. This absence of documented safety incidents suggests the compound has not caused identifiable harm at levels used in food applications.

However, it is important to note that isopropyl propionate has not been evaluated and approved under the FDA's GRAS (Generally Recognized As Safe) system. This means it lacks the formal safety assessment that GRAS-listed flavorings have undergone. The absence of GRAS status does not necessarily indicate safety concerns; rather, it reflects that a formal GRAS determination or food additive petition has not been completed for this substance in the United States.

General toxicological considerations for synthetic esters suggest that flavoring agents in this chemical class are typically metabolized by the body through standard ester hydrolysis pathways. The compound's volatile nature means that respiratory exposure is theoretically possible in manufacturing settings, though food-use levels are not expected to present inhalation hazards to consumers.

## Regulatory Status

In the United States, isopropyl propionate is not listed as a GRAS flavoring agent. This means it cannot be used as a direct food additive in the U.S. food supply without prior FDA approval through a food additive petition process. Any use in U.S. foods would require specific authorization.

Regulatory status varies by country. Some nations may permit its use under different regulatory frameworks for flavoring substances. The European Union maintains separate approval processes for food flavorings, and isopropyl propionate's status in EU markets may differ from U.S. regulations.

Manufacturers and food companies considering use of this flavoring must verify its regulatory status in their specific market before incorporation into food products.

## Key Studies

Limited published scientific literature specifically evaluates isopropyl propionate's safety in food applications. Most safety data for synthetic esters relies on structural analogs and general toxicological principles rather than direct human studies. Acute toxicity studies typical of synthetic flavorings would be conducted as part of any formal safety assessment or regulatory petition process.

The absence of adverse event reports or recalls suggests that where this compound has been used in food products, it has not caused identified safety problems. However, comprehensive toxicological studies specific to isopropyl propionate would be needed to establish formal safety parameters for food use.

Additional safety information may be available through manufacturer safety data sheets and technical literature in industrial chemistry databases.

## 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. "Isopropyl Propionate — Safety, regulation, and evidence." https://additivefacts.com/additives/isopropyl-propionate. Accessed 2026-05-19.