# Nonanal Propyleneglycol Acetal

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**Safety rating:** SAFE
**CAS number:** 68391-39-9
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

Nonanal Propyleneglycol Acetal (CAS 68391-39-9) is a synthetic flavoring compound used to create fruity and floral taste profiles in food and beverages. It functions as a flavoring agent or adjuvant to enhance or modify the sensory characteristics of processed foods.

## 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 Nonanal Propyleneglycol Acetal?

Nonanal Propyleneglycol Acetal is a synthetic organic compound created through the reaction of nonanal (a nine-carbon aldehyde) with propylene glycol. The resulting acetal structure (CAS Number 68391-39-9) is classified as a flavoring agent in food chemistry. This compound belongs to a broader category of synthetic flavor compounds designed to imitate or enhance natural flavor profiles in food manufacturing.

The compound's chemical structure makes it a volatile organic compound, meaning it readily releases aromatic compounds that contribute to flavor perception. Its propylene glycol acetal backbone provides stability and allows for controlled release of flavor compounds during food processing and storage.

## Common Uses

Nonanal Propyleneglycol Acetal is employed in the food industry primarily as a flavoring agent or adjuvant. Its typical applications include:

- Beverages (both alcoholic and non-alcoholic)
- Confectionery and candy products
- Baked goods
- Dairy products
- Savory snacks and processed foods

The compound is valued for its ability to impart fruity and floral notes to food formulations. Food manufacturers use it in small concentrations (typically parts per million) to achieve desired flavor profiles while maintaining product stability and shelf life.

## Safety Assessment

According to FDA records, there are zero reported adverse events associated with Nonanal Propyleneglycol Acetal and zero product recalls linked to this additive. This absence of safety incidents in post-market surveillance represents an important data point for consumer safety assessment.

The compound's safety profile is supported by its limited use levels in food applications. Flavoring agents like this one are typically used in very small quantities—often measured in parts per million—which significantly reduces potential exposure concerns.

As with many synthetic flavoring compounds, safety assessment should consider both acute and chronic exposure scenarios. The propylene glycol component is itself widely recognized as safe in food applications and has extensive regulatory approval across multiple jurisdictions.

## Regulatory Status

Nonanal Propyleneglycol Acetal does not carry FDA GRAS (Generally Recognized as Safe) status. This means the compound has not undergone the formal GRAS determination process with the FDA. However, it may be used in food products under FDA regulations governing food additives, subject to appropriate approvals and usage limitations.

The lack of GRAS status does not necessarily indicate safety concerns; rather, it reflects that formal GRAS notification procedures have not been completed or formally recognized for this particular compound. Food manufacturers wishing to use this additive must ensure compliance with all applicable FDA regulations and obtain necessary pre-market approvals.

International regulatory approaches to this flavoring compound may vary. Different countries maintain their own food additive approval processes and acceptable use lists.

## Key Studies

Scientific literature specific to Nonanal Propyleneglycol Acetal in isolation is limited. However, safety assessments of similar synthetic flavor compounds and propylene glycol-based ingredients provide relevant context. Research on acetalized flavor compounds generally supports their safety when used at approved levels in food applications.

The FDA's Flavor and Extract Manufacturers' Association (FEMA) maintains databases and conducts periodic assessments of flavoring compounds used in food. General toxicological principles applied to this class of compounds suggest that typical food-use concentrations present minimal safety concerns for the general population.

Consumers seeking detailed toxicological data on this specific compound may consult manufacturer safety data sheets or contact food companies directly for information on specific product formulations.

## 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. "Nonanal Propyleneglycol Acetal — Safety, regulation, and evidence." https://additivefacts.com/additives/nonanal-propyleneglycol-acetal. Accessed 2026-05-19.