Statistical Analysis of Metal Chelating Activity of Centella asiatica and Erythroxylum cuneatum Using Response Surface Methodology

Table 2

Face centered, central composite design setting with the independent variables and their responses in CA.

Run number	𝑋1	𝑋2	𝑋3	𝑋4	Y; 1/IC50	IC50
1	30	150	40	60	1.72	0.5814
2	30	150	40	60	1.429	0.6998
3	35	100	35	30	5.2	0.1923
4	30	150	40	60	1.55	0.6452
5	30	150	40	90	1.96	0.5102
6	35	200	35	30	2.4	0.4167
7	30	150	40	60	1.3426	0.7448
8	30	150	35	60	0.84	1.1905
9	30	150	40	30	1.57	0.6369
10	25	100	45	30	2.3	0.4348
11	35	200	45	90	2.703	0.3700
12	35	100	45	30	2.01	0.4975
13	25	100	35	30	4.6	0.2174
14	35	150	40	60	4.56	0.2193
15	30	200	40	60	1.399	0.7148
16	30	150	45	60	0.94	1.0638
17	25	200	45	90	10.753	0.0930
18	35	200	35	90	1.98	0.5051
19	30	150	40	60	1.49	0.6711
20	35	100	35	90	0.84	1.1905
21	30	150	40	60	1.49	0.6711
22	25	200	45	30	3	0.3333
23	35	200	45	30	0.29	3.4483
24	25	150	40	60	7.98	0.1253
25	25	100	45	90	3.49	0.2865
26	25	100	35	90	1.12	0.8929
27	25	200	35	30	4.167	0.2400
28	30	100	45	90	0.098	10.2041
29	35	100	45	90	0.93	1.0753
30	25	200	35	90	4.35	0.2299