Antioxidant rich grape pomace extract suppresses postprandial hyperglycemia in diabetic mice by specifically inhibiting alpha-glucosidase

Table 1 Total phenolic content, total flavonoid content, ORAC, and DPPH of the pomace extracts.

	Red grape pomace	White grape pomace	Red Apple pomace
Total phenolic content (mg GAE/g)	30.4 ± 11.0^a	24.5 ± 6.0^a,b	11.2 ± 5.9^b
Total flavonoid content (mg RE/g)	22.1 ± 8.9^a	16.2 ± 5.4^a,b	5.7 ± 4.7^b
ORAC (μmol TE/g)	245.3 ± 21.0^a	197.7 ± 25.5^b	168.8 ± 22.7^b
%DPPH Inhibition/mg	66.1 ± 0.6	67.4 ± 4.1	54.6 ± 13.2

Total phenolic content is expressed as μg of gallic acid equivalents (GAE) per gram of pomace; total flavonoid content is expressed as μg of rutin equivalents (RE) per gram of pomace. Oxygen radical absorbance capacity (ORAC) was measured in triplicate, values expressed as micromoles Trolox equivalents per gram of pomace (μmol TE/g). The DPPH radical scavenging activity was expressed as percent inhibition of DPPH free radical per mg of pomace. For each measurement, the data marked by different letters for each assay are significantly different (P < 0.05).

ISSN: 1743-7075