Table 8.

Proposed experiments by the Box–Behnken method and the predicted and experimental values of sugar yields obtained by subcritical water extraction of chestnut bark.

Run	Temp. (X1), °C	Time (X2), min	Solvent-Solid Ratio (X3), mL/g	Glucose Yield, mg/g of Bark		Fructose Yield, mg/g of Bark		Maltose Yield, mg/g of Bark		Arabinose Yield, mg/g of Bark
				Experimental	Predicted	Experimental	Predicted	Experimental	Predicted	Experimental
1	150 (−1)	10 (−1)	20 (0)	13.2	13.3	13.0	14.5	17.9	18.1	9.2
2	250 (1)	10 (−1)	20 (0)	0	0.008	0	0.06	0	0.0004	0
3	150 (−1)	60 (1)	20 (0)	7.8	6.9	11.4	11.0	8.5	8.4	12.5
4	250 (1)	60 (1)	20 (0)	0	0.008	0	0.06	0	0.0004	0
5	150 (−1)	35 (0)	10 (−1)	9.5	10.6	13.9	12.7	11.2	11.4	16.5
6	250 (1)	35 (0)	10 (−1)	0	0.01	0	0	0	0.002	0
7	150 (−1)	35 (0)	30 (1)	9.3	9.2	12.5	12.7	14.7	14.3	11.4
8	250 (1)	35 (0)	30 (1)	0	0.01	0	0	0	0.002	0
9	200 (0)	10 (−1)	10 (−1)	15.3	14.1	14.9	13.4	5.9	5.1	5.9
10	200 (0)	60 (1)	10 (−1)	10.4	10.0	10.1	10.0	2.7	2.4	0
11	200 (0)	10 (−1)	30 (1)	12.8	12.5	13.8	13.4	5.9	5.8	9.7
12	200 (0)	60 (1)	30 (1)	7.5	8.6	6.8	10.0	3.0	2.9	0
13	200 (0)	35 (0)	20 (0)	11.7	11.2	13.4	11.6	4.2	3.9	0
14	200 (0)	35 (0)	20 (0)	11.8	11.2	12.5	11.6	3.6	3.9	0
15	200 (0)	35 (0)	20 (0)	10.8	11.2	12.7	11.6	3.7	3.9	0
16	200 (0)	35 (0)	20 (0)	11.5	11.2	12.0	11.6	4.0	3.9	0
17	200 (0)	35 (0)	20 (0)	10.0	11.2	9.6	11.6	2.9	3.9	0