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Table 2 Factors (NaOH loading, ethanol content, temperature, and time) and the responses (released pCA and recovered xylan in residues) of the Box–Behnken design used for response surface methodology

From: Alkaline organosolv pretreatment of different sorghum stem parts for enhancing the total reducing sugar yields and p-coumaric acid release

Run Factor Response
NaOH (%) Ethanol (%) Temperature (°C) Time (h) Released pCA (%) Recovered xylan in residues (%)
Pith Rind Whole Pith Rind Whole
1 1.25 10 70 2.5 66.23 67.64 67.57 79.78 74.35 75.21
2 1.25 70 65 1 83.99 83.74 83.82 76.06 86.71 84.69
3 1.25 40 65 2.5 79.66 85.56 81.68 80.42 82.21 80.28
4 2 10 65 2.5 85.05 88.45 88.29 63.95 72.78 62.18
5 1.25 40 60 4 79.22 86.40 79.70 73.22 81.10 82.49
6 1.25 10 65 4 84.90 87.36 87.19 65.39 77.34 77.80
7 1.25 70 60 2.5 75.00 82.14 78.72 81.84 84.69 79.63
8 2 40 65 1 85.44 88.31 87.60 65.11 80.53 70.17
9 0.5 40 70 2.5 45.47 25.97 45.02 79.98 82.44 81.01
10 0.5 40 65 4 32.36 31.59 33.02 89.17 82.95 80.13
11 1.25 40 65 2.5 80.27 84.54 82.89 81.03 82.07 81.02
12 0.5 70 65 2.5 36.49 21.49 32.92 88.92 85.44 88.17
13 2 40 60 2.5 86.89 92.30 90.52 64.88 79.12 68.76
14 1.25 70 65 4 84.15 86.52 85.85 83.71 82.64 81.43
15 0.5 10 65 2.5 33.08 32.00 34.48 82.73 85.31 73.70
16 1.25 70 70 2.5 90.14 91.14 90.73 79.94 86.96 87.58
17 1.25 40 65 2.5 78.96 84.25 82.47 80.76 83.11 79.87
18 0.5 40 65 1 31.53 19.42 29.79 85.12 89.10 83.22
19 2 40 70 2.5 87.14 93.68 90.17 64.70 74.80 70.11
20 2 70 65 2.5 94.97 98.07 98.44 67.98 84.89 68.77
21 1.25 40 65 2.5 79.28 87.44 80.13 79.82 82.89 80.05
22 1.25 10 60 2.5 57.88 56.28 57.51 70.35 75.86 75.80
23 1.25 40 60 1 67.08 66.70 71.29 80.95 83.15 78.85
24 0.5 40 60 2.5 28.14 22.31 28.02 84.60 83.07 86.24
25 1.25 10 65 1 53.48 52.89 55.36 77.08 73.69 74.36
26 1.25 40 65 2.5 81.77 85.79 83.11 79.91 82.58 80.74
27 1.25 40 70 4 84.80 91.44 90.94 74.72 79.11 76.34
28 1.25 40 70 1 77.19 79.06 78.81 72.52 82.80 79.47
29 2 40 65 4 97.12 95.41 95.30 65.36 74.10 65.80