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.