Table 3: Central composite design and results.

RunFactor 1Factor 2Response
NumberEthanol 
(%)
Flavonoid 
(mg/50mL)

1576%30.22
2579%31.68
3776%26.27
4779%29.18
5675%26.40
6680%29.90
7578%31.40
8778%28.40
9678%36.45
10678%36.95
11678%34.13
12678%33.81
13678%34.95