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High-amylose corn starch

High-amylose corn starch suppliers and sourcing guide

High-amylose corn starch is starch from corn hybrids bred so that amylose makes up about 50 to 80% of the starch instead of the usual 25%. The starch is wet-milled from the kernels in the usual way; because amylose packs into tight, crystalline granules, a large share resists digestion even after normal baking. It is sold as a white powder graded by amylose and resistant starch content, used in baked goods, pasta and supplements.

See suppliersWhat to ask for on the COA
Category
Fibers
Also known as
high-amylose maize starch · resistant starch 2 (RS2) · Hi-maize · Zea mays starch
Facts checked
November 2026

Forms and grades of high-amylose corn starch

Suppliers sell different products under the same name. Specify the one you need.

  • High-amylose starch (about 50 to 60% amylose)

    Moderate resistant starch content; used where some fiber and normal handling are wanted.

  • High-amylose starch (about 70 to 80% amylose)

    Higher resistant starch content, often 40 to 60% total dietary fiber; the usual RS2 grade.

  • Heat-moisture treated grades

    Physically treated to keep more resistant starch through cooking.

  • Non-GMO grades

    From identity-preserved non-GMO corn, with documentation.

What to check on the COA

Compare each result with your own specification when the lot arrives.

Total dietary fiber or resistant starch
Fiber by AOAC 991.43 or 2009.01, or resistant starch by AOAC 2002.02, on a dry basis.
Amylose content
Amylose by iodine binding or concanavalin A method.
Moisture
Loss on drying.
Protein, ash and pH
Purity checks for wet-milled starch.
Sulfur dioxide
Residual sulfite from the steeping step in wet milling.
Microbiology
Total plate count, yeast and mold, coliforms or Enterobacteriaceae, E. coli and Salmonella.

Storage, lots and expiry

Storage and shelf life

Keep the starch in sealed bags in a cool, dry place away from odors and pests. It is stable as a dry powder; suppliers set a best-before date for unopened packaging.

Lots and expiry dates

Fiber and resistant starch values depend on the corn hybrid and process, so record them from each COA if fiber grams go on the label. Keep non-GMO documentation per lot where it matters.

Regulatory status

Facts from regulators and standards bodies, each linked to its source.

  • FDA lists high amylose starch (resistant starch 2) among the non-digestible carbohydrates it intends to propose adding to its dietary fiber definition, and until rulemaking intends to allow it in the dietary fiber declaration.

    Source: fda.gov (opens in a new tab)

  • GRN 615, for high-amylose cornstarch notified by Yale University for use in oral rehydration solutions at 50 grams per liter, closed on Jun 24, 2016 with FDA having no questions.

    Source: hfpappexternal.fda.gov (opens in a new tab)

This is general information, not regulatory advice. Status differs by country and by how the ingredient is used, so check the rules for your product and market.

High-amylose corn starch suppliers

Manufacturers and distributors whose own websites say they sell it.

We are checking high-amylose corn starch suppliers now

Every listing is checked against the supplier’s own website before it goes live, so this list fills in over the coming weeks. The specs and COA checklist above are ready today.

Sell high-amylose corn starch? Request a listing

Frequently asked questions

What forms of high-amylose corn starch can brands buy?

Common forms include high-amylose starch (about 50 to 60% amylose), high-amylose starch (about 70 to 80% amylose), heat-moisture treated grades and non-GMO grades. Ask each supplier for the specification sheet of the exact grade they quote.

What should the COA for high-amylose corn starch include?

Expect total dietary fiber or resistant starch, amylose content, moisture, protein, ash and pH, sulfur dioxide and microbiology, each with its method, specification and result for that lot.

How should high-amylose corn starch be stored?

Keep the starch in sealed bags in a cool, dry place away from odors and pests. It is stable as a dry powder; suppliers set a best-before date for unopened packaging.

What is the regulatory status of high-amylose corn starch?

FDA lists high amylose starch (resistant starch 2) among the non-digestible carbohydrates it intends to propose adding to its dietary fiber definition, and until rulemaking intends to allow it in the dietary fiber declaration. GRN 615, for high-amylose cornstarch notified by Yale University for use in oral rehydration solutions at 50 grams per liter, closed on Jun 24, 2016 with FDA having no questions.

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