Table 4
Experimental data on dependent variables of green tea re-extract under the different conditions based on the central composite design for response surface analysis

Ext. No.¹⁾	Yield(%)	EGC²⁾(%)	EC(%)	ECGC(%)	ECG(%)	Caffeine(%)	Totalcatechin(%)
1	51.91±0.38^a3)	11.8±0.22^bc	3.5±0.04^bcd	21.74±0.21^bc	5.25±0.04^b	5.91±0.02^cd	42.29±0.47^b
2	35.77±0.07^d	12.49±0.51^de	3.77±0.14^defg	22.44±0.71^d	5.26±0.13^cd	5.84±0.02^de	43.96±1.41^cd
3	36.21±0.46^d	12.72±0.21^abc	3.64±0.05^defg	21.95±0.15^bcd	5.33±0.08^bc	5.87±0.08^bcd	43.63±0.29^bc
4	26.79±1.09^f	13.05±0.04^ab	3.87±0.09^abc	23.64±0.16^b	5.68±0.08^bc	6.24±0.09^cde	46.23±0.19^b
5	38.8±0.91^c	12.45±0.07^bcd	3.77±0.03^cdef	22.4±0.45^bcd	5.29±0.05^b	5.88±0.08^bc	43.9±0.40^bc
6	25.3±0.85^f	11.71±0.21^de	3.56±0.03^efgh	20.8±0.26^d	4.95±0.19^cd	5.68±0.06^cde	41.02±0.65^cd
7	42.12±0.72^b	11.79±0.21^a	3.53±0.04^a	21.47±0.81^a	4.99±0.15^a	5.82±0.22^b	41.78±1.16^a
8	30.68±2.07^e	11.69±0.09^f	3.44±0.08ⁱ	20.77±0.29^e	5.01±0.07^de	5.76±0.09^de	40.92±0.52^e
9	30.9±1.29^e	12.18±0.44^ef	3.62±0.1^hi	21.54±0.38^cd	5.2±0.12^c	5.79±0.06^bcd	42.54±0.86^d
10	8.94±1.00^h	13.03±0.17^a	3.94±0.07^ab	23.33±0.19^a	5.75±0.12^a	6.02±0.02^a	46.06±0.51^a
11	21.29±1.01^g	12.16±0.36^cd	3.65±0.09^cde	21.62±0.42^bc	5.18±0.17^c	5.76±0.03^bcd	42.61±0.92^bc
12	36.46±0.30^d	12.61±0.17^f	3.79±0.04^fghi	22.4±0.16^e	5.38±0.13^e	5.82±0.05^e	44.18±0.36^e
13	35.33±0.44^d	12.37±0.13^ef	3.71±0.08^ghi	22.04±0.20^d	5.48±0.03^e	5.91±0.10^cde	43.6±0.42^de

¹⁾The number of experimental condition by central composite design.
²⁾Epigallocatechin (EGC), Epicathchin (EC), Epigallocatechingallate (EGCG), Epicatechingallate (ECG).
³⁾Mean of triplicates±SD (n=3). Values sharing the same superscript within are not significantly different (α=0.05).