Effect of different treatments on serum levels of TAC, GSH, and MDA^a.

Groups	TAC (mmol L−1)	GSH (mg dL−1)	MDA (nmol L−1)
Normal control	0.51 ± 0.009f	50.28 ± 0.907cd	13.05 ± 0.28a
STZ-diabetic rats	0.26 ± 0.006a	25.96 ± 0.84a	26.43 ± 0.93f
Diabetic rats treated with ethanolic extracts of leaves of
cv. Festival	0.48 ± 0.011e	51.66 ± 1.66d	15.86 ± 0.57bc
cv. Red Merlin	0.45 ± 0.01d	47.98 ± 1.53cd	16.38 ± 0.58bc
Diabetic rats treated with ethanolic extracts of fruits of
cv. Festival	0.43 ± 0.01c	46.75 ± 1.516bc	17.18 ± 0.61cd
cv. Red Merlin	0.41 ± 0.009b	43.63 ± 1.41b	18.76 ± 0.66de
Diabetic rats treated with gliclazide	0.59 ± 0.013g	57.05 ± 1.27e	14.36 ± 0.31ab

^aEach value represents the mean of 6 rats ± S.E. (standard error). Values within a column followed by different letters are significantly different (P < 0.05) by SPSS Duncan. Where STZ: streptozotocin; TAC: total antioxidant capacity in (mmol L⁻¹); GSH: glutathione in (mg dL⁻¹); MDA: malondialdehyde in (nmol L⁻¹).