Market
Erythorbic acid (isoascorbic acid; INS 315 / E 315) is a globally traded food additive used primarily as a water-soluble antioxidant in manufactured foods where oxidation control and color stability are commercial priorities. Its international market access is strongly shaped by additive permissions and use conditions set by Codex (GSFA) and by major regulators (e.g., EU and U.S.), so compliance documentation is central to trade. Because it is an industrially manufactured ingredient rather than a farm commodity, supply is linked to chemical manufacturing capacity and quality system performance rather than harvest seasonality. Demand is most closely tied to processed meat and seafood manufacturing and to broader packaged-food production where antioxidant functionality is permitted and economical.
Specification
Major VarietiesErythorbic acid (isoascorbic acid) — INS 315 / E 315, Sodium erythorbate (sodium isoascorbate) — E 316 (related commercial salt form)
Physical Attributes- White to slightly yellow crystalline solid that darkens gradually on exposure to light
- Freely soluble in water; soluble in ethanol
Compositional Metrics- Assay: not less than 99% on the dried basis (food additive specification)
- Loss on drying: not more than 0.4%
- Sulfated ash: not more than 0.3%
- Lead: not more than 2 mg/kg
ProcessingMelting range about 164–172°C with decompositionReducing reaction behavior consistent with an antioxidant/reductant (specification identification tests)
Risks
Regulatory Compliance HighMarket access is highly regulation-driven: Codex GSFA lists erythorbic acid (INS 315) with GMP provisions across multiple food categories, while major jurisdictions (e.g., EU) set category-specific maximum levels and conditions for E 315/E 316 use. Misalignment between formulation practice and destination-market limits, or inadequate documentation for compliance, can trigger border rejection, recalls, or forced reformulation.Maintain destination-specific legal registers (Codex + local rules), verify additive limits by food category before production, and retain complete compliance dossiers (specs, CoA, traceability, and labeling support).
Quality and Contamination MediumTrade is sensitive to meeting internationally recognized identity and purity specifications; off-spec assay/purity or impurity exceedances (e.g., heavy metal limits such as lead) can lead to rejection by industrial buyers and regulators.Source from suppliers aligned with JECFA specifications, require batch CoAs, and implement incoming QA testing for assay, moisture, ash, and metals.
Market Perception LowAs an E-number/INS-listed additive, erythorbic acid can be exposed to clean-label pressures that may reduce usage in certain branded products even when safety evaluations support authorized uses.Support customers with regulatory citations and, where feasible, offer formulation alternatives or optimized lowest-effective-use guidance within legal limits.
FAQ
What is erythorbic acid (INS 315 / E 315) used for in foods?It is used as an antioxidant (a water-soluble antioxidant function recognized in Codex GSFA and JECFA materials), with Codex GSFA provisions covering multiple food categories including certain meat, seafood, and grape wine applications under GMP conditions.
What are key food-grade specification expectations for erythorbic acid in international trade?JECFA specifications describe erythorbic acid as a white to slightly yellow crystalline solid and set identity/purity expectations such as assay not less than 99% on the dried basis, along with impurity controls including limits for loss on drying, sulfated ash, and lead.
How do major regulators view the safety of erythorbic acid and sodium erythorbate?WHO/FAO JECFA lists an ADI as “not specified” for erythorbic acid (INS 315) based on its evaluations, and EFSA concluded in its re-evaluation that there was no reason to revise the existing ADI and that permitted uses would not be of safety concern based on its exposure assessment.