AGEs	Advanced glycation end-products
AOPP	Advanced oxidation protein products
AR	Aldose reductase
CAT	Catalase
DM	Diabetic control rats
DM + BRB	Diabetic rats treated with berberine at a dose of 50 mg/kg p.o.
GPx	Glutathione peroxidase
GSH	Reduced glutathione
NDM	Non-diabetic control rats
NPSH	Non-protein sulfhydryl groups
PCA	Principal component analysis
PC 1, PC 2	Principal component 1, principal component 2
SOD	Superoxide dismutase
TAC	Total antioxidant capacity
TBARS	Thiobarbituric acid reactive substances