Optimum Extraction, Characterization, and Antioxidant Activities of Polysaccharides from Flowers of Dendrobium devonianum

Table 2

ANOVA for response surface quadratic model: analysis of variance table (partial sum of squares). : temperature (°C), : extraction time (min), and : water-to-material ratio.

Source	Sum of squares	DF	Mean square	value	value	Significant
Model	50.10	9	5.566395	8.944987	0.0043
	5.45	1	5.445	8.74991	0.0212
	3.50	1	3.498013	5.621174	0.0495
	9.53	1	9.526613	15.30891	0.0058
	0.01	1	0.01	0.01607	0.9027
	0.1296	1	0.1296	0.208262	0.6620
	1.199025	1	1.199025	1.926788	0.2077
	8.451287	1	8.451287	13.5809	0.0078
	8.421487	1	8.421487	13.53301	0.0079
	10.23689	1	10.23689	16.45029	0.0048
Residual	4.356045	7	0.622292
Lack-of-fit	1.578925	3	0.526308	0.758064	0.5731
Pure error	2.77712	4	0.69428
Cor. total	54.4536	16

and .