Table 2
Polynomial equations calculated by RSM program for the dr ied Gugija

Responses	Polynomial equations1)	R2	Signifi-cance
Brown color intensity	Y1=0.126595+0.012201X1+0.118702X2-0.000937X1X2-0.000061786X12-0.009964X22	0.8903	0.0470
Total phenolic compounds	Y4=1226.98+48.945833X1-166.291667X2-5.8625X1X2-0.405156X12+70.3125X22	0.8667	0.0676
ABTS radical scavenging activity	Y6=0.998512+0.19881X1+1.917619X2-0.067375X1X2-0.000449X12+0.280536X22	0.8486	0.0856
Fe2+ chelating activity	Y7=50.32003-0.338351X1+3.186964X2-0.03825X1X2+0.000757X12-0.193661X22	0.9214	0.0249

X₁, Ethanol conc (%); X₂, Extraction time (hr).