Protective Effect of Free and Bound Polyphenol Extracts from Ginger (Zingiber officinale Roscoe) on the Hepatic Antioxidant and Some Carbohydrate Metabolizing Enzymes of Streptozotocin-Induced Diabetic Rats

Table 1

Effect of administration of polyphenols from Z. officinale on the fasting blood glucose of normal and streptozotocin-diabetic rats.

Group	Glucose (mmol/L)
	Day 1	Day 14	Day 28
Normal control	4.51 ± 0.18^a	4.44 ± 0.20^a	4.78 ± 0.36^a
Diabetic control	18.34 ± 0.47^b	21.8 ± 0.67^b	24.87 ± 1.13^b
Diabetic + free polyphenol	20.44 ± 0.72^b	21.38 ± 0.95^b	12.22 ± 1.63^d
Diabetic + bound polyphenol	21.8 ± 0.67^b	22.46 ± 0.91^b	16.56 ± 0.95^c
Diabetic + glibenclamide	20.48 ± 0.83^b	17.56 ± 0.39^c	9.22 ± 0.78^d

Values are mean ± S.E.M. of 8 rats per group. Test values down the vertical columns carrying different superscripts for each day are significantly different (P < 0.05).