Discussion
Identify the analysis that must be performed FIRST to judge ‘cleanliness’ of spice/herb powders.
Answer: A
The first analysis is acid-insoluble ash content.
Acid-insoluble ash is the residue left after ashing the sample and boiling the ash in dilute hydrochloric acid. It is mostly silica, so it measures the sand, soil and dust that contaminate spice and herb powders. That is the direct measure of physical cleanliness, and spice standards set a limit on it.
Pesticide residues and mycotoxins are chemical safety tests, done after cleanliness is established and needing more elaborate methods. Volatile oil content measures quality, the strength of flavour and aroma, not whether the powder is clean.
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