Table 3.
Experimental conditions and response values of Box–Behnken design for butter volatile compounds of margarine extraction by HS-SPME
| Exp. no | Fiber type | Extraction temperature, T (°C) | Extraction time, t (min) | R1 (Total area of volatile compoundsa) | R2 (Number of volatile compounds) |
|---|---|---|---|---|---|
| 1 | CAR/PDMS | 30 | 30 | 1.06655 ± 0.2097 | 6 |
| 2 | DVB/CAR/PDMS | 50 | 20 | 2.94353 ± 0.4163 | 7 |
| 3 | PDMS/DVB | 50 | 30 | 3.54877 ± 0.1159 | 7 |
| 4 | PDMS/DVB | 30 | 30 | 2.33744 ± 0.0908 | 5 |
| 5 | CAR/PDMS | 50 | 30 | 2.88108 ± 0.4386 | 7 |
| 6 | PDMS/DVB | 40 | 40 | 3.02459 ± 0.1981 | 7 |
| 7 | DVB/CAR/PDMS | 40 | 30 | 2.80404 ± 0.3222 | 7 |
| 8 | DVB/CAR/PDMS | 40 | 30 | 3.26585 ± 0.2949 | 8 |
| 9 | DVB/CAR/PDMS | 50 | 40 | 3.65450 ± 0.2989 | 8 |
| 10 | PDMS/DVB | 40 | 20 | 2.24293 ± 0.2863 | 7 |
| 11 | CAR/PDMS | 40 | 20 | 1.19712 ± 0.1467 | 7 |
| 12 | DVB/CAR/PDMS | 40 | 30 | 3.28538 ± 0.2266 | 8 |
| 13 | DVB/CAR/PDMS | 30 | 40 | 1.87774 ± 0.0688 | 6 |
| 14 | DVB/CAR/PDMS | 40 | 30 | 3.07491 ± 0.1098 | 8 |
| 15 | CAR/PDMS | 40 | 40 | 1.79668 ± 0.2342 | 7 |
| 16 | DVB/CAR/PDMS | 40 | 30 | 3.17000 ± 0.1905 | 8 |
| 17 | DVB/CAR/PDMS | 30 | 20 | 1.32387 ± 0.4358 | 3 |
aSum of the ratio of peak areas to internal standard