Protein efficiency ratio (PER)
The PER value of sodium caseinate was reduced by the
heat treatment from 2.8$0.2 for the unheated to
2.6$0.2 and 2.4$1 for the samples heated at 120 and
1323C for 60 min, respectively.The differences were signi"cant
(P(0.05). There was no signi"cant difference in
the treated samples (P'0.05).The effects of heating on the digestibility of proteins
have been discussed by Cheftel (1979), Visser (1981),
Renner (1983), Mauron (1982), Schaafsma (1989) and
Friedman (1992).