# Starch, Acid Modified

> Source URL: https://additivefacts.com/additives/starch-acid-modified
> Markdown URL: https://additivefacts.com/additives/starch-acid-modified.md

**Safety rating:** UNKNOWN
**CAS number:** 65996-63-6
**Category:** other
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

Starch, Acid Modified is a chemically altered starch produced by treating native starch with acid to hydrolyze some of its glycosidic bonds. It is used in food manufacturing as a thickening, stabilizing, or texturizing agent, though its specific function in individual products may vary.

## 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 Starch, Acid Modified?

Starch, Acid Modified (CAS Number 65996-63-6) is a food ingredient derived from native starch sources such as corn, potato, or tapioca. The modification process involves treating starch with dilute acid under controlled conditions to partially hydrolyze the polymer chains. This chemical modification reduces the molecular weight and viscosity of the starch while maintaining its basic carbohydrate structure. The acid treatment breaks down some of the glycosidic bonds within the starch granules, creating a product with altered functional properties compared to unmodified starch.

## Common Uses

Acid-modified starch serves multiple functions in food manufacturing. It is commonly employed as a thickening agent in sauces, gravies, and soups, where it provides desired texture and viscosity. The ingredient is also used as a stabilizer in products such as salad dressings, puddings, and desserts to prevent separation and maintain consistency. In some applications, it functions as a texturizing agent to improve mouthfeel in processed foods. The modification process makes the starch more suitable for certain industrial applications where standard starch may not provide optimal performance, particularly in products requiring lower viscosity or specific flow characteristics.

## Safety Assessment

Starch, Acid Modified has an established safety profile in food applications. According to FDA records, there have been zero adverse events reported in connection with this additive and zero recalls associated with its use. The ingredient is composed of the same fundamental carbohydrate polymers as native starch and undergoes hydrolysis rather than chemical synthesis, which generally results in a substance with minimal toxicological concern. The acid-modification process is a well-established food technology that has been used in various formulations for decades.

As a starch-derived ingredient, Acid Modified Starch is metabolized similarly to native starches and other carbohydrates in the human digestive system. The primary components are glucose units linked by alpha-glycosidic bonds, and the partial hydrolysis does not introduce novel structures or metabolic pathways. No specific adverse health effects have been identified at levels typical of food use.

## Regulatory Status

Starch, Acid Modified is not listed on the FDA's Generally Recognized as Safe (GRAS) list, which means it has not been formally affirmed as GRAS by the FDA through the standard GRAS notification process. However, this does not indicate the ingredient is unsafe; rather, it reflects that the specific GRAS affirmation pathway may not have been formally completed or pursued. The ingredient may be used under FDA regulations governing food additives or may be considered acceptable under existing food standards. Manufacturers using this ingredient must ensure compliance with applicable FDA regulations and labeling requirements. In the European Union, modified starches are regulated under food additive regulations and must meet specifications outlined in relevant food safety legislation.

## Key Studies

While limited published research specifically examines Acid Modified Starch in isolation, the safety of modified starches as a class has been evaluated by regulatory bodies including the Joint FAO/WHO Expert Committee on Food Additives (JECFA). General toxicology studies on acid-modified starches have demonstrated low toxicity profiles, with the primary consideration being the composition and purity of the final product. Studies of modified starches indicate that the partial hydrolysis does not create compounds with concerning genotoxic or carcinogenic potential. The ingredient's safety depends on proper manufacturing controls to ensure appropriate modification levels and the absence of harmful contaminants or byproducts.

## 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. "Starch, Acid Modified — Safety, regulation, and evidence." https://additivefacts.com/additives/starch-acid-modified. Accessed 2026-05-20.