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PIC/S中提到的NPC(Negative product controls),是怎么做的?
11.5.2.1 Negative product controls, which are similar in type and packaging to the actual
product under test, should be included in each test session. These controls
facilitate the interpretation of test results, particularly when used to declare a test
invalid because of contamination in the negative product controls.
11.5.2.2 A minimum of ten negative product control containers may be adequate to
simulate manipulations by the operator during a membrane filtration test. An
equivalent number of samples to the test samples may be necessary to simulate
the manipulations of the product by the operator/s during a direct inoculation
test.
11.5.2.3 The negative control contamination rate should be calculated and recorded.
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