Contribution a l'étude des méthodes de recherche des neutralisants dans les poudres de lait écrémé

Abstract - Several methods based on different principles are used to analyse liquid milks. It is necessary to know the amplitude of natural variations of milk composition and to study the possible sources of error in order to appreciate the value of each procedure.
There are two methods for determining the alkalinity of ashes compared; the A.O.A.C. method gives more reproductible results than the Dutch method; but neither of them can be used for the examination of ammonia neutralized milks.
With flame photometry the determination of alkaline and alkaline-earth metals is possible. A direct method is described to titrate ammonia.
For the determination of lactates and lactic acid, Davidson, Venekamp and Kruisheer methods give comparable results; the first may be used as a standard method; the second; which is more rapid, is more convenient for mass analysis