Table 6.

Changes of plasma levels of antioxidant vitamin, TRAP and glutathione of the participants by GSTM1 or GSTT1 genotype after 8 weeks of grape juice supplementation

	All participant (n = 95)	GSTM1 genotype		GSTT1 genotype
		Present (n = 39)	Null (n = 56)	Present (n = 34)	Null (n = 61)
Ascorbic acid (mg/dl)
0 week	1.15 ± 0.03	1.20 ± 0.05	1.11 ± 0.04	1.09 ± 0.07	1.18 ± 0.04
8 weeks	1.19 ± 0.04	1.21 ± 0.05	1.18 ± 0.05	1.29 ± 0.06*	1.14 ± 0.05
α-tocopherol (µg/dl)
0 week	1,888 ± 251	1,801 ± 531	1,949 ± 217	1,677 ± 569	2,006 ± 233
8 weeks	1,536 ± 158	1,185 ± 227	1,781 ± 212	1,091 ± 200	1,784 ± 214
γ-tocopherol (µg/dl)
0 week	244.1 ± 21.6	257.2 ± 36.4	235.0 ± 26.7	273.8 ± 38.2	227.6 ± 26.1
8 weeks	286.0 ± 22.9	264.8 ± 33.5	300.8 ± 31.2*	306.8 ± 40.2	274.4 ± 27.9
α-carotene (µg/dl)
0 week	16.1 ± 1.5	15.5 ± 1.5	16.5 ± 2.4	13.9 ± 1.6	17.3 ± 2.2
8 weeks	17.2 ± 2.3	20.9 ± 5.1	14.6 ± 1.5	22.4 ± 6.10	14.3 ± 1.1
β-carotene (µg/dl)
0 week	86.2 ± 5.7	90.4 ± 9.1	83.3 ± 7.2	83.9 ± 9.6	87.6 ± 7.1
8 weeks	82.7 ± 7.2	99.8 ± 14.7	70.8 ± 6.4	90.8 ± 16.7	78.2 ± 6.4
TRAP (mM)
0 week	1.497 ± 0.002	1.497 ± 0.002	1.497 ± 0.002	1.498 ± 0.002	1.496 ± 0.002
8 weeks	1.496 ± 0.001	1.495 ± 0.002	1.497 ± 0.002	1.496 ± 0.003	1.496 ± 0.002
Glutathione (µM)
0 week	633.2 ± 15.2	599.0 ± 16.8	657.0 ± 22.6	661.3 ± 29.6	617.6 ± 16.9
8 weeks	670.5 ± 17.0	678.4 ± 22.0*	665.0 ± 24.7	681.1 ± 22.9	664.6 ± 23.4

All values are means ± SE. TRAP: Total radical-trapping antioxidant potential. *Statistical significance at p<0.05 after paired t test.