Table 2. Monomer and dimer tannin concentration of grape skin at different solvents condition by HPLC-DAD

Solvents Skin (mg/kg)
catechin epicatechin gallocatechin epigallocatechin procyanidin B1 procyanidin B2 total
Methanol 100% 47.2±2.79bc,1)2) 18.2±5.00ab 0.0±0.00c 0.0±0.00c 703.1±51.47c 35.5±5.29c 804.1±56.89bc
70% 57.8±1.31ab 25.3±0.71a 0.0±0.00c 0.0±0.00c 919.5±52.86b 41.3±6.27c 1,043.9±57.57ab
70%+0.5% HCl 23.6±0.95d 13.5±0.03bc 0.0±0.00c 70.8±3.58ab 195.1±5.43e 186.5±8.04b 489.4±14.79de
Ethanol 100% 51.4±0.94bc 14.2±0.10bc 47.0±1.86b 0.0±0.00c 896.3±51.04b 38.5±4.57c 1,047.5±53.76ab
70% 58.1±2.52ab 14.3±0.21bc 50.4±3.02ab 0.0±0.00c 987.7±47.89ab 48.4±3.67c 1,158.9±51.88a
70%+0.5% HCl 27.2±9.58d 10.2±6.78c 0.0±0.00c 58.5±34.55b 176.3±67.89e 176.2±91.44b 448.3±204.05e
Acetone 100% 47.9±4.02c 15.7±0.27bc 45.4±2.27b 0.0±0.00c 537.2±82.49d 118.0±10.21bc 764.3±95.54c
70% 65.2±2.26a 14.5±0.15bc 55.6±5.30a 0.0±0.00c 1,076.7±21.61a 57.7±3.40c 1,269.7±28.24a
70%+0.5% HCl 32.2±4.52d 13.8±0.19bc 0.0±0.00c 100.3±31.55a 260.2±59.66e 300.2±74.94a 706.7±167.74cd
1)Mean±Standard deviation. (n=4)
2)Different letters are significantly different at p<0.05 by Duncan’s multiple range test (DMRT).
3)N.D = Not detected.