Research Article

Optimization of Ultrasound-Assisted Extraction of Total Flavonoids from Dendranthema indicum var. aromaticum by Response Surface Methodology

Table 5

Analysis of variance (ANOVA) for the response surface quadratic model.

SourceEstimated coefficientsSum of squaresDegree of freedomMean squareF-valueProb. > F

Model0.38535.83E − 0296.48E − 0358.69<0.0001
X13.68E − 021.85E − 0211.85E − 02167.40<0.0001
X29.90E − 031.34E − 0311.34E − 0312.110.0059
X34.61E − 022.90E − 0212.90E − 02262.52<0.0001
X1X22.81E − 046.33E − 0716.33E − 070.010.9411
X1X3−6.19E − 033.06E − 0413.06E − 042.770.1270
X2X33.69E − 031.09E − 0411.09E − 040.990.3439
−3.19E − 031.47E − 0411.47E − 041.330.2758
−2.27E − 027.42E − 0317.42E − 0367.16<0.0001
−1.30E − 022.44E − 0312.44E − 0322.120.0008
Residual1.10E − 03101.10E − 04
Lack of fit6.84E − 0451.37E − 041.630.30
Pure error4.21E − 0458.42E − 05
Cor. total5.95E − 0219