20 mL of grape juice was mixed with 0.008 g glutathione, canned
in a test tube, exhausted at 95 C for 3 min, sealed using a rubber
stopper, sterilized at 100 C for 15 min, and stored at 80 C for different
time (6, 12, 18, 24, 30, and 36 h, respectively). The control was
run in the same manner, except that glutathione was not added.