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AACC International Approved Methods - AACC Method 28-20.02. Microscopic Examination of External Contamination in Whole Grains

AACC International Approved Methods

Extraneous Matter

AACCI Method 28-20.02
Microscopic Examination of External Contamination in Whole Grains

VIEW METHOD

Objective
To isolate and record external insect and rodent contamination from cereal grains, unpopped popcorn, and dried peas and beans. Sample is boiled to saturate food product without affecting insect, hair, feathers, and other extraneous matter. In this method, heptane is mixed into solution, coating filth and insects. Filth is isolated and separated by attraction to the heptane phase of the mixture. Heptane is isolated in neck of flask with a rod and disk or equivalent. Filth is filtered onto ruled filter paper for microscopic examination.