Acid Insoluble Ash (AIA)
Acid Insoluble Ash is the portion of total ash that remains undissolved when treated with dilute hydrochloric acid. It primarily consists of siliceous matter such as sand, soil, and other mineral contaminants that are not soluble in acid. AIA is widely used as an indicator of extraneous contamination in food, feed, and botanical products.
Why It’s Important
- Purity Indicator: High AIA levels suggest contamination with dirt, sand, or adulterants.
- Quality Control: Used to assess raw material integrity in spices, herbs, cereals, and animal feed.
- Regulatory Compliance: Required by standards such as AOAC 941.12, ASTA Method 4.0, and USP <561> for botanicals and spices.
- Adulteration Detection: Helps identify intentional dilution with mineral fillers or poor post-harvest handling.
Typical Applications
- Spices and herbs (e.g., black pepper, turmeric, oregano)
- Tea and herbal infusions
- Animal feed and forage
- Cereal grains and flours
- Nutraceuticals and botanical powders
Testing Procedure (AOAC / ASTA Aligned)
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Typical Applications
- AOAC 941.12 – Official method for AIA in spices and herbs.
- ASTA Method 4.0 – Determination of AIA in spice products (ASTA Guide).
- USP <561> – Botanical identity and purity testing.
- FDA CPG Sec. 555.425 – Action levels for filth and extraneous matter in spices.
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