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Table 2 Test design and results of response surface analysis (each test was performed in triplicate)

From: Optimization of inulin production process parameters using response surface methodology

Run Coded variable Actual variable Response
X Y Z A B C Yield %
1 0 +1 −1 120 24 0.02 10.97 ± 0.06
2 − 1 0 −1 115 22 0.02 11.35 ± 0.09
3 + 1 −1 0 125 20 0.03 11.05 ± 0.11
4 − 1 0 +1 115 22 0.04 09.77 ± 0.04
5 0 +1 +1 120 24 0.04 09.35 ± 0.03
6 0 0 0 120 22 0.03 12.03 ± 0.14
7 0 0 0 120 22 0.03 12.16 ± 0.15
8 0 0 0 120 22 0.03 11.98 ± 0.14
9 + 1 0 −1 125 22 0.02 10.50 ± 0.07
10 0 −1 +1 120 20 0.04 09.95 ± 0.02
11 + 1 0 +1 125 22 0.04 09.55 ± 0.05
12 + 1 +1 0 125 24 0.03 10.33 ± 0.07
13 − 1 −1 0 115 20 0.03 10.20 ± 0.06
14 − 1 +1 0 115 24 0.03 10.66 ± 0.07
15 0 −1 −1 120 20 0.02 10.48 ± 0.08
16 0 0 0 120 22 0.03 12.16 ± 0.18
17 0 0 0 120 22 0.03 12.98 ± 0.22
  1. X&A,Y&B, Z&C indicate the temperature (°C) creep speed and applied pressure respectively