UPLC-ESI-MS/MS Analysis and Evaluation of Antioxidant Activity of Total Flavonoid Extract from Paeonia lactiflora Seed Peel and Optimization by Response Surface Methodology (RSM)

Table 2

Analysis of variance for the response surface model for the flavonoid yield of P. lactiflora seed peel.

Source	Sum of squares	Df	Mean square	value	value
Model	9.66	9	1.07	82.17	<0.0001
	0.34	1	0.34	25.87	0.0014
	0.87	1	0.87	66.25	<0.0001
		1		0.076	0.7910
	0.065	1	0.065	4.98	0.0609
	0.077	1	0.077	5.87	0.0458
		1		0.70	0.4310
	1.28	1	1.28	97.94	<0.0001
	2.83	1	2.83	217.00	<0.0001
	3.36	1	3.36	257.04	<0.0001
Residual	0.091	7	0.013
Lack of fit	0.063	3	0.021	2.96	0.1611
Pure error	0.028	4
Cor total	9.75	16
	0.9906
Adj	0.9786
Pred	0.8920
Adeq precision	23.971

: ethanol concentration; : liquid-solid ratio; : ultrasonic time.