Optimization of Extraction Process for Antidiabetic and Antioxidant Activities of Kursi Wufarikun Ziyabit Using Response Surface Methodology and Quantitative Analysis of Main Components

Table 3

Analysis of variance.

Source	Sum of squares	Degrees of freedom	Mean of square	F value	P value
Yield of extraction
Model	321.42	14	22.96	10.37	<0.0001 (significant)
Residual	31.00	14	2.21
Pure error	1.17	4	0.29
Lack of fit	29.83	10	2.98	10.24	0.0192
Total	352.41	28
	0.9120		Adj.	0.8241
Model equation
Total polyphenol content
Model	423.50	14	30.25	47.38	<0.0001 (significant)
Residual	8.94	14	0.64
Pure error	2.49	4	0.62
Lack of fit	6.45	10	0.65	1.04	0.5314 (not significant)
Total	432.42	28
	0.9793		Adj.	0.9587
Model equation
PTP-1B inhibition rate
Model	1318.42	14	94.17	9.82	<0.0001 (significant)
Residual	134.24	14	4.41
Pure error	31.82	4	7.95
Lack of fit	102.42	10	10.24	1.29	0.4350 (not significant)
Total	1452.66	28
	0.9076		Adj.	0.8152
Model equation
α-Glucosidase inhibition rate
Model	1449.06	14	103.50	10.43	<0.0001 (significant)
Residual	138.87	14	9.92
Pure error	11.50	4	2.88
Lack of fit	127.37	10	12.74	4.43	0.0822 (not significant)
Total	1587.93	28
	0.9125		Adj.	0.8251
Model equation
ABTS inhibition rate
Model	2213.57	14	158.11	33.37	<0.0001 (significant)
Residual	66.33	14	4.74
Pure error	8.87	4	2.22
Lack of fit	57.46	10	5.75	2.59	0.1859 (not significant)
Total	2279.90	28
	0.9709		Adj.	0.9418
Model equation

Value of lack of fit as analyzed by ANOVA.