To determine total solids content (TS), raw milk samples (5 g)
were accurately weighed and poured into stainless aluminium
dishes and placed in an oven (100 C) to constant weight. The
residual dry weight of raw milk was considered as the total solids.
To measure buffering capacity (BC), 4.0 ml 0.1 M HCL solution
was added to 25 ml raw milk sample and left for 1 h at room
temperature. The pH difference before, and 1 h after, acid addition
was considered to be the buffering capacity, and was expressed in
pH units. The fall in pH accompanied by this procedure is similar to
the fall in pH when milk is heated from 20 C to 120 C.
Ash content was measured using the AOAC method (2005)
employing a Precisa 125A balance. Dry ashing was preferred to