Overview
ISO 8355:2023 - Starch acetates: Specifications and test methods - defines physical, chemical and microbiological requirements and standardized test methods for starch acetates (acetylated starches). The standard covers appearance and solubility, chemical composition (acetyl/ester content, sulfur dioxide, moisture, pH), contaminant limits (heavy metals, fat, protein) and microbiological criteria, plus methods for sampling, analysis, marking, packaging, transport and storage.
Key topics and requirements
- Scope: Physical, chemical and microbiological requirements for starch acetates and associated test procedures (ISO 8355:2023).
- Physical indexes: Appearance (powder/granule), colour (white to nearly white), granular structure, insolubility in cold water/ether/alcohol, absence of foreign matter.
- Chemical indexes:
- Acetyl groups: Not more than 2.5% (dry weight).
- Ester groups: Not more than 0.5% (dry weight).
- pH: 3.0–9.0 (10% w/v solution).
- Moisture: ≤ 14% (ISO 1666).
- Sulfur dioxide: Limits specified for modified cereal starches and other modified starches; method detailed in subclause 5.3 (titration procedure).
- Iodine stain: Colour change from dark blue to red (subclause 5.1).
- Copper reduction: Copious red precipitate expected for positive qualitative reduction test.
- Infrared test: Ester absorption band at ~1720 cm−1; detection threshold for acetyl groups ~0.5%.
- Contaminant limits: Specified limits for arsenic, lead, mercury, manganese, cadmium, crude fat and protein (see standard for exact values and test methods such as ISO 11212 series and AOAC 2011.14).
- Microbiological limits: Aerobic plate count ≤ 1 000 CFU/g, yeasts & moulds ≤ 1 000 CFU/g, total coliform ≤ 10 CFU/g (ISO microbiological methods referenced).
- Packaging & storage: Marking, transport and storage requirements to preserve product integrity.
Applications and practical value
- Ensures quality control and consistent performance of starch acetates used as stabilizers, thickeners, binders and emulsifiers in food and cosmetic formulations.
- Helps manufacturers, ingredient suppliers, QC laboratories and regulatory authorities verify compliance, safety and labeling claims.
- Standardized test methods (iodine stain, pH, sulfur dioxide titration, acetyl/ester analyses, ICP/AAS for metals) enable reproducible acceptance testing and supplier audits.
Who should use this standard
- Food ingredient producers and processors, cosmetic formulators, contract manufacturers, quality assurance labs, regulatory inspectors, and importers/exporters of modified starch products.
Related standards (normative references)
For product specification, compliance checks or method adoption, consult the full ISO 8355:2023 text for procedural details, calculation formulas and sampling instructions.
