Читать книгу Analytical Food Microbiology - Ahmed E. Yousef - Страница 32

The food inspector or sample collector delivers laboratory samples to the analytical facility. The delivered sample could be a retail package, a consumer‐size container, or a portion of a food bulk. Sample preparation refers to the reduction of the laboratory sample into a test sample (or analytical sample) and preparation of the latter for analysis. Therefore, sample preparation includes: (i) withdrawal and measurement of a representative test sample from the laboratory sample; (ii) homogenization to distribute microorganism uniformly in the test sample; and (iii) dilution of the sample homogenate to decrease food microbiota to a countable or detectable level.