Table 1. Analysis of variance results for the optimization of hydrolysis condition

Coefficients	Solubility (%)
Intercept	−92.378032
Linear
X1	0.017706
X2	−17.095073
X3	36.569238*
Cross product
X21	0.023193
X31	0.030731
X32	2.206393*
Quadratic
X12	−0.000753**
X22	−2.017272*
X32	−2.712181*
Model significance	0.0064
Lack-of-fit	0.0873
R2	0.9096

p<0.05 and
p<0.01.