Abstract
The view that resazurin is not a satisfactory substitute for methylene blue in assessing the hygienic quality of milk has been examined.Resazurin is equally as sensitive as methylene blue to the metabolic activities of bacteria in milk. It is decidedly more sensitive to the presence of non-bacterial factors in abnormal milks (mastitis, late lactation, etc.) and therefore furnishes a more comprehensive index of the true quality of the milk.Potentiometric studies with a wide variety of milks have failed to support the view that resazurin exerts such a strong poising action in market milks as to complicate the test or interfere with the interpretation of results. No evidence was obtained in support of the claim that differences in poising properties of different milks are of sufficient magnitude to affect the results of the test.
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