Table 2.

Regression coefficients and R² for 3 dependent variables.

	Coefficient
Factors	Y1	P-value	Y2	P-value	Y3	P-value	Y4	P-value
Intercept	4.0661	0.0003	32.6547	0.0020	−703.8039	0.0016	−290.9216	0.0010
X1	0.5111	<0.0001	2.7610	0.2549	25.2261	0.0012	11.4194	0.0019
X2	–0.0383	0.2138	–0.0882	0.0190	1.2056	0.1793	0.8182	0.0014
X3	–0.0420	0.8091	0.6080	0.2984	3.4779	0.0028	0.5106	0.0037
X1 X2	5.9630E-007	0.9926	4.3946E-003	0.0006	−2.99455E-003	0.3642	−8.2063E-003	0.0021
X1 X3	–4.3161E-004	0.0027	8.7194E-005	0.6712	–2.65101E-003	0.0455	–2.9028E-003	0.0016
X2 X3	1.1160E-004	0.0027	8.7194E-005	0.6712	–2.65101E-003	0.0455	–2.9028E-003	0.0016
X12	–6.5214E-003	0.0001	–0.0494	0.0004	–0.3112	0.0002	–0.1168	0.0005
X22	3.0407E-005	0.0049	–8.5158E-005	0.2179	–9.55657E-004	0.0281	–3.5891E-004	0.0586
X32	4.4595E-005	0.5542	–1.1803E-003	0.1391	−7.55125E-003	0.0816	2.5527E-003	0.1791
R2		0.9362		0.8563		0.8674		0.8919

Y₁, degree of phosphorylation (mg/g); Y₂, soubility (g/100 g); Y₃, foaming ability (%); Y₄: foaming stability(%).