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Turbidimetric Determination of Fat in Milk

Dairying Laboratory University of Agriculture Wageningen, The Netherlands

ABSTRACT

As Haugaard (2) has questioned the validity of my results (4), I am forced to return to the merits of his turbidimetric method.

The problem in turbidimetric fat testing is that turbidity is not only dependent on fat content but also on globule size. Haugaard (1) put forward a solution that is undoubtedly correct for monodisperse systems; that is, all globules within the same milk are assumed equal in size. However, he tried to prove that this method would give exactly the same results for real milks that have a spread in globule size. Nevertheless, Haugaard's mathematical derivation is erroneous. He correctly assumes that for any particular wave length there is a hypothetical monodisperse milk of the same fat content, whose turbidity is equal to that of the real milk under study. He now proceeds as if the derivatives with respect to globule size or wave length also are equal, but it is an established fact that at a point where two curves cross, their derivatives are usually unequal [Fig. 1 of my paper (4)].