Run  Block               Independent variables                                                              Response variable

                        Extraction         Equilibrium        Extraction                                         Total flavour peak

                        temp (°C)        time (min)          time (min)                                         TIC x 104

                                x1                    x2                         x3                                                       Y1

1         1             25.00               30.00                  15.00                                                     3.58

2         1             25.00               30.00                    5.00                                                     3.23

3         1             42.50               20.00                  10.00                                                     4.41

4         1             60.00               30.00                  15.00                                                     4.66

5         1             42.50               20.00                  10.00                                                     4.41

6         1             25.00               10.00                   5.00                                                      3.23

7         1             60.00               10.00                   5.00                                                      4.51

8         1             42.50               20.00                  10.00                                                     4.41

9         1             25.00               10.00                  15.00                                                     3.58

10       1             60.00               30.00                   5.00                                                      4.61

11       1             42.50               20.00                  10.00                                                     4.41

12       1             60.00               10.00                  15.00                                                    4.57

13       2             42.50               36.82                  10.00                                                    4.43

14       2             42.50               20.00                   1.59                                                     4.37

15       2             42.50               20.00                  10.00                                                    4.41

16       2             42.50               20.00                  18.41                                                    4.49

17       2             42.50               20.00                  10.00                                                    4.41

18       2             71.93               20.00                  10.00                                                    5.36

19       2             13.07               20.00                  10.00                                                    2.56

20       2             42.50                3.18                  10.00                                                     4.15

Table 2: Central composite design and experimental results for the response functions for the total flavour peak area of roasted chickpea.