3.2. Effects of glycerol and lactic acid on quality of Chinese steamed bun
From the ANOVA it was found that only glycerol affected aw while only lactic acid affected pH.
Thus the effect of each additive was analyzed separately. Table 3 showed that the aw decreased
significantly as glycerol increased from 0 to 5% ( p 0.05). The appearance of the bun with 2.5% glycerol was not significantly from
control (0% glycerol and lactic acid). For lactic acid, it was found that aw, appearance, and texture did not
change significantly (p>0.05) while pH, flavour and OAA of bun decreased as lactic acid increased. The
bun with 0.25% lactic acid had preference score on flavour and OAA not significantly different from
control. Therefore glycerol at 2.5% and lactic acid at 0.25% were chosen.