Table 2
Total polyphenol, flavonoid, and proanthocyanidin contents of 70% ethanol extracts of grape seed prepared with different drying methods (mg/g, dry basis)

Mesurement	GSFD¹⁾	GSIR²⁾	GSHD³⁾	GSSD⁴⁾
Polyphenols(gGAE⁵⁾/100g)	30.09±0.53^a8)	23.65±0.45^d	25.84±0.31^c	7.47±0.24^b
Flavonoids(gRHE⁶⁾/100g)	7.68±0.05^a	6.45±0.52^b	7.33±0.26^a	7.59±0.29^a
Proanthocyanidins(gCE⁷⁾/100g)	18.29±1.86^a	13.94±1.20^b	12.26±2.58^b	7.30±1.41^c

¹⁾GSFD, ethanol extract of grape seed with freeze drying.
²⁾GSIR, ethanol extract of grape seed with infrared drying.
³⁾GSHD, ethanol extract of grape seed with heat air drying.
⁴⁾GSSD, ethanol extract of grape seed with sun drying.
⁵⁾GAE, gallic acid equivalents.
⁶⁾RHE, rutin hydrate equivalents.
⁷⁾CE, catechin hydrate equivalents.
⁸⁾Values are means±SD of triplicate determinations. Different superscripts within a row indicate significant differences (p<0.05).