The percent changes in L values of the grape juice after juicing
for the control and treatment of glutathione (0.04%) is shown innon-enzymatic browning was the primary browning form existed
in the sterilized grape juice. For the control, the % decrease in L values
increased with incubation time (P < 0.05). In the case of the
treatments, the percent decrease in L values increased slightly during
the whole incubation time and was significantly lower than
that of the control, e.g. the percent decrease in L values for the
treatment after 36 h was 0.74% and only 6.92% of that of the control
(Fig. 3).