Skip to content
SupplyList
Menu

Erythorbic acid

Erythorbic acid suppliers and sourcing guide

Erythorbic acid is a stereoisomer of ascorbic acid, made by fermenting glucose to 2-keto-D-gluconic acid and then converting and crystallizing the product. It is a white crystalline powder that dissolves well in water. Food processors buy it, or its sodium salt sodium erythorbate, to slow oxidation and color loss in cured meats, fruit, vegetables, beer and wine.

See suppliersWhat to ask for on the COA
Also known as
Isoascorbic acid · D-Araboascorbic acid · E315 · CAS 89-65-6
Facts checked
November 2026

Forms and grades of erythorbic acid

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

  • Crystalline powder

    The free acid, the standard form, sold in fine and granular mesh sizes.

  • Sodium erythorbate

    The more common salt form for cured meat brines; it is a separate ingredient with its own specification.

  • Encapsulated

    Coated erythorbic acid for dry sausage and meat blends, which delays its reaction with nitrite.

What to check on the COA

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

Assay (iodometric titration)
Erythorbic acid content on a dry basis, usually 99 percent or more.
Specific rotation
Optical rotation, which distinguishes erythorbic acid from ascorbic acid.
Loss on drying
Moisture content of the powder.
Residue on ignition
Sulfated ash, a check on inorganic carryover.
Heavy metals
Lead, arsenic and other metals by ICP-MS or ICP-OES against the supplier's specification or the Food Chemicals Codex (FCC) limits.

Storage, lots and expiry

Storage and shelf life

Store erythorbic acid in sealed, opaque containers in a cool, dry place. It reacts with oxygen, especially in moist air or solution, and turns yellow as it degrades. Shelf life is set by the supplier's specification, and older stock is retested for assay and color.

Lots and expiry dates

Record assay and appearance for each lot, and reject material that has yellowed. Keep it separate from nitrite curing blends until use, and rotate stock first-expiring first.

Regulatory status

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

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.

Erythorbic acid suppliers

Manufacturers and distributors whose own websites say they sell it.

We are checking erythorbic acid 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 erythorbic acid? Request a listing

Frequently asked questions

What forms of erythorbic acid can brands buy?

Common forms include crystalline powder, sodium erythorbate and encapsulated. Ask each supplier for the specification sheet of the exact grade they quote.

What should the COA for erythorbic acid include?

Expect assay (iodometric titration), specific rotation, loss on drying, residue on ignition and heavy metals, each with its method, specification and result for that lot.

How should erythorbic acid be stored?

Store erythorbic acid in sealed, opaque containers in a cool, dry place. It reacts with oxygen, especially in moist air or solution, and turns yellow as it degrades. Shelf life is set by the supplier's specification, and older stock is retested for assay and color.

What is the regulatory status of erythorbic acid?

21 CFR 182.3041 lists erythorbic acid as generally recognized as safe when used in accordance with good manufacturing practice. Health Canada's List of Permitted Preservatives includes erythorbic acid, for example in beer, cider, fruit wine and wine.

More acids, preservatives and leavening

All 72 acids, preservatives and leavening

Sell ingredients to brands?

Request a free listing for the ingredients you make or distribute. No paid placement.

Request a listing