Table 2.

Results of ANOVA for extraction yield and uronic acid content of LAHP.

Source	Sum of squares	DF	Mean square	F value	p-value
Yield (%)
Model	144.30	9	16.03	265.05	<0.0001
X1	118.97	1	118.97	1966.58	<0.0001
X2	6.85	1	6.85	113.15	<0.0001
X3	1.42	1	1.42	23.47	0.0019
X1 X2	0.081	1	0.081	1.34	0.2846
X1 X3	0.14	1	0.14	2.39	0.1663
X2 X3	0.11	1	0.11	1.86	0.2154
X12	6.94	1	6.94	114.75	<0.0001
X22	3.05	1	3.05	50.47	0.0002
X32	5.04	1	5.04	83.30	<0.0001
Residual	0.42	7	0.060
Lack of Fit	0.32	3	0.11	4.09	0.1035
Pure error	0.10	4	0.026
Total	144.73	16
R2 = 0.9971, adj-R2 = 0.9933, CV = 1.63
Uronic acid content (%)
Model	1529.35	9	169.93	113.34	<0.0001
X1	362.61	1	362.61	241.87	<0.0001
X2	75.22	1	75.22	50.17	0.0002
X3	34.40	1	34.40	22.95	0.0020
X1 X2	2.58	1	2.58	1.72	0.2313
X1 X3	1.22	1	1.22	0.81	0.3968
X2 X3	0.17	1	0.17	0.11	0.7475
X12	298.30	1	298.30	198.97	<0.0001
X22	150.54	1	150.54	100.42	<0.0001
X32	501.13	1	501.13	334.26	<0.0001
Residual	10.49	7	1.50
Lack of Fit	8.26	3	2.75	4.93	0.0787
Pure error	2.23	4	0.56
Total	1539.84	16
R2 = 0.9932, adj-R2 = 0.9844, CV = 1.68