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Table 4 Factorial fractional design matrix FF 24−1 (real and coded values) with their respective responses (enzymatic activity). The experiments were conducted at 28 °C and 140 rpm

From: Marine-derived fungus Aspergillus cf. tubingensis LAMAI 31: a new genetic resource for xylanase production

Run Variablesa.b Xylanase (U/mL)
pH Inoculum (pellets) Peptone RS
1 6 (−1) 5 (−1) 0 (−1) 70 (−1) 135.30
2 8 (1) 5 (−1) 0 (−1) 110 (1) 91.21
3 6 (−1) 7 (1) 0 (−1) 110 (1) 104.78
4 8 (1) 7 (1) 0 (−1) 70 (−1) 124.37
5 6 (−1) 5 (−1) 80 (1) 110 (1) 63.69
6 8 (1) 5 (−1) 80 (1) 70 (−1) 61.43
7 6 (−1) 7 (1) 80 (1) 70 (−1) 79.90
8 8 (1) 7 (1) 80 (1) 110 (1) 42.97
9 (C) 7 (0) 6 (0) 40 (0) 90 (0) 73.12
10 (C) 7 (0) 6 (0) 40 (0) 90 (0) 72.74
11 (C) 7 (0) 6 (0) 40 (0) 90 (0) 88.19
12 (C) 7 (0) 6 (0) 40 (0) 90 (0) 50.50
  1. c central point, RS rice straw
  2. a Coded values in parenthesis
  3. b Values in g/L