Table 4.
Mathematical equations from response surface method (RSM) for each of the responses, with their respective value of R2 and R2-predicted.
| Extraction | Equation | R2 Value | |
|---|---|---|---|
| Response | R 2 | R2-Pred. | |
| Ethanolic | |||
| TPC(mg GAE/g DW) | −132.03 + 2.37 T + 1.18 C + 3.13 t − 0.013 T2 − 0.009 C2 − 0.03 t2 − 0.003 T × C − 0.014 T × t − 0.003 C × t | 97.8 | 84.8 |
| ORAC(mg TE/g DW) | −544.88 + 11.18 T + 7.75 C+ 6.97 t − 0.068 T2 − 0.038 C2 − 0.058 t2 − 0.024 T × C − 0.009 T × t − 0.069 C × t | 93.5 | 51.2 |
| Rosmarinic Acid (mg/L) | −58.94 + 0.88 T + 1.09 C + 0.52 t − 0.004 T2 − 0.0012 C2 + 0.006 t2 − 0.004 T × C − 0.007 T × t − 0.009 C × t | 99.7 | 97.6 |
| Aqueous | |||
| TPC(mg GAE/g DW) | −132.03 + 2.371 T + 1.18 t − 0.002 T2 − 0.006 t2 − 0.005 T × t | 96.3 | 83.8 |
| ORAC(mg TE/g DW) | −9.236 + 4.654 T − 12.357 t − 0.0538 T2 − 0.149 t2 − 0.257 T × t | 94.5 | 61.1 |
| Rosmarinic Acid (mg/L) | −67.250 + 1.233 T + 4.140 t − 0.009 T2 − 0.146 t2 − 0.005 T × t | 98.5 | 89.1 |
T: Temperature (°C); C: Ethanol concentration (%); t: Time (min); Pred.: response predicted by model.