Acid-Insoluble Ash
Definition
The fraction of a food's mineral content that does not dissolve in 10% hydrochloric acid, reflecting mineral adulterants (brick, sand, talc, soil). AOAC 920.158; the FSSAI limit for chilli powder is 1.0% acid-insoluble ash; higher values indicate mineral adulteration.
- Test medium
- 10% hydrochloric acid
- Detects
- Mineral adulterants: brick, sand, talc, soil
- Standard
- AOAC 920.158
- FSSAI limit, chilli powder
- 1.0% acid-insoluble ash
- Interpretation
- Higher value indicates mineral adulteration
Common questions
Why is acid-insoluble ash used instead of total ash to detect adulteration?+
Total ash includes natural mineral content that varies by crop and soil, while acid-insoluble ash isolates the fraction resistant to dissolution, dominated by added sand, grit, or mineral fillers rather than the spice's own composition.
Does this test identify which adulterant was added?+
No, it only quantifies total acid-insoluble residue; identifying the specific adulterant, such as brick powder versus sand, needs further microscopy or elemental analysis of the residue.
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