Table 3.

Summary of catechins extraction efficiency and alpha-glucosidase inhibitory activity of GTEs by three infusion methods.

	H2O (90 °C, 1.5 min)	H2O (25 °C, 24 h)	70% EtOH (25 °C, 24 h)
Total catechins (g/100 g dry leaves)	2.97 ± 0.506 a	4.36 ± 0.642 b	7.95 ± 0.970 c
Gallate catechins (g/100 g dry leaves)	1.36 ± 0.293 a	1.57 ± 0.316 a	5.06 ± 0.830 b
Free catechins (g/100 g dry leaves)	1.57 ± 0.313 a	2.83 ± 0.553 a	2.95 ± 0.594 b
GCs/FCs ratio	0.90 a	0.58 b	1.79 c
Alpha-glucosidase inhibitory activity (%)	78.7 ± 3.37 a	89.1 ± 4.23 b	93.2 ± 4.21 b

The numerical values with different letters significantly differ (p < 0.05) in the same row.