Table 3 Regression analysis for regression model of brown color intensity, total phenolic compounds, ABTS radical scavenging activity and Fe2+ chelating activity of the dried Gugija
Regression model
F-value
Ethanol conc.
Extraction time
YBrown color intensity
10.28**1)
0.83
YTotal phenolic compounds
4.40*
1.26
YABTS radical scavenging activity
4.06
4.93*
YFe2+ chelating activity
15.54**
0.11
*Significant at 10% level; **Significant at 5% level