Table 2.

Quantitative analysis of catechins, gallic acids and caffeines in the extract of the aged Chinese green tea (HSGT) a.

Ingredients (mg/g)	03Y	07Y	11Y	15Y	19Y
CG	2.64 ± 0.05 a	1.67 ± 0.04 ab	1.65 ± 0.14 ab	0.76 ± 0.04 b	1.08 ± 0.08 ab
ECG	29.73 ± 0.96 b	33.74 ± 0.37 ab	33.94 ± 0.81 a	30.34 ± 1.18 b	26.51 ± 0.21 b
GCG	16.47 ± 0.39 a	10.45 ± 0.48 b	11.44 ± 0.21 b	11.13 ± 0.51 b	12.24 ± 0.24 b
EGCG	137.55 ± 1.04 a	141.79 ± 0.04 a	146.77 ± 0.85 a	131.21 ± 0.98 a	131.20 ± 0.63 a
EC	9.65 ± 0.11 b	9.31 ±0.25 b	12.41 ± 0.21 a	13.52 ± 0.47 a	14.37 ± 0.15 a
C	6.17 ± 0.03 a	4.48 ± 0.13 ab	6.49 ± 0.02 a	5.46 ± 0.14 ab	4.35 ± 0.26 b
GC	69.02 ± 0.00 b	86.00 ± 1.28 a	51.71 ± 0.85 c	52.05 ± 1.87 c	44.13 ± 0.73 c
EGC	38.65 ± 1.25 c	33.02 ± 0.77 c	45.03 ± 0.09 b	58.59 ± 1.82 a	63.67 ± 0.36 a
GA	10.88 ± 0.03 a	9.79 ± 0.17 b	6.40 ± 0.22 c	5.54 ± 0.33 c	3.45 ± 0.03 d
CAFF	92.67 ± 0.25 a	90.45 ± 1.47 a	75.85 ± 0.10 b	88.99 ± 1.06 ab	71.96 ± 0.01 b
Ester catechins	185.59 ± 4.96 a	184.01 ± 2.66 a	180.13 ± 7.42 a	188.57 ± 7.20 a	169.85 ± 2.02 a
Non-ester catechins	120.91 ± 2.13 a	132.37 ± 0.72 a	115.26 ± 0.15 a	129.62 ± 4.30 a	128.21 ± 2.61 a
Total catechins	306.50 ± 5.45 a	328.23 ± 2.40 a	308.18 ± 15.38 a	303.29 ± 11.49 a	298.06 ± 4.89 a

^a Values represent means ± SD (n = 4). One-way ANOVA analysis was performed between the treatments of multiple tea samples. The different lowercase letters (a, b, c) in the same group show the significant differences at p < 0.05 level. CG, catechin gallate; ECG, Epicatechin-3-gallate; GCG, gallocatechin-3-gallate; EGCG, epigallocatechin-3-gallate; EC, epicatechin; C, catechin; GC, gallocatechin; EGC, epigallocatechin; GA, gallic acid; CAFF, caffeine.