Table 1. Calibration data of monomeric and dimeric tannin standards

Standards	g/mol1)	RT2) (min)	y3)	R24)
Gallocatechin (GC)	306.27	4.98	3.9937x5)-2.4627	0.9991
Procyanidin B1 (B1)	578.52	7.28	4.9389x-2.6796	0.9991
Epigallocatechin (EGC)	306.27	7.84	1.6090x+0.2980	0.9992
Catechin (C)	290.27	10.40	5.3023x-3.3328	0.9992
Procyanidin B2 (B2)	578.52	12.97	1.5590x+0.4530	0.9992
Epicatechin (EC)	290.27	14.94	3.1386x-2.270	0.9991
Epigallocatechin gallate (EGCG)	458.37	15.80	64.3020x-1.8139	0.9994
Epicatechin gallate (ECG)	442.37	26.80	2.3376x-1.720	0.9992
Catechin gallate (CG)	442.37	27.63	1.8433x-1.5696	0.9991

Molecular weight of standards.
Retention time.
Arear of peak.
Regression line.
Concentration of tannin standard.