Table 4.
Regression coefficients of second degree polynomials for total anthocyanin contents, DPPH radical scavenging activity and SOD-like activity of enzyme-assist extracted anthocyanin from Bokbunja.

Parameters	Estimate
	Total anthocyanin contents (mg/100 g)	DPPH radical scavenging activity (%)	SOD-like activity (%)
	Intercept	9.852	109.635	70.878
X11)	-7.136	-55.136	-72.745
X22)	-0.193	-0.945	0.354
X33)	0.529	-9.359	-10.543
X1*X1	4.455	25.268	17.769
X2*X1	0.053	0.254	0.113
X2*X2	0.002	0.003	-0.007
X3*X1	-0.566	0.125	4.796
X3*X2	-0.011	0.133	0.014
X3*X3	0.020	0.361	0.418

X₁: Concentration of Pectinex Ultra SP-L (mL/100 L)
X₂: Reaction temperature (°C)
X₃: Reaction time (hr)