Table 2.

Second-order regression equations for IR and WB extraction.

Extraction Technique	Equations
IR	TPC = − 10.21 + 0.29 t + 0.0015 T + 0.52 E − 0.0009 t2 − 0.0003 t T + 0.0001 t E + 0.005 T2 + 0.003 T E − 0.007 E2 DPPH = − 159.174 + 1.25 t + 3.19 T + 2.41 E − 0.004 t2 − 0.004 t T − 0.0004 t E − 0.015 T2 − 0.0056 T E − 0.02 E2
WB	TPC = − 26.83 + 0.26 t + 0.42 T + 0.62 E − 0.00111123 t2 + 0.0007 t T + 0.0008 t E − 0.0006 T2 + 0.002 T E − 0.009 E2 DPPH = − 184.92 + 1.27 t + 3.06 T + 2.65 E− 0.004 t2 + 0.0035 t T− 0.007 t E − 0.03 T2 + 0.012 T E − 0.017 E2