Chemical analysis
The protein, fat, total solids, total acidity and ash content of the
milks were determined according to the association of official
analytical chemists (AOAC) methods (1995). The degree of protein
denaturation in conventionally heated and thermosonicated milks
was determined by measuring the non-casein nitrogen in 20 ml
aliquots of milk after precipitation of the casein fraction at pH
4.2