Research Article
Optimization of Ultrasound-Assisted Extraction of Polyphenol Content from Zea mays Hairs (Waste)
Figure 5
Contour plots for the effect of independent variables on polyphenol content in hydroethanolic extract. (a) Contour plot graph showing interaction between solvent-to-material ratio (X2) and ethanol concentration (X1); (b) contour plot graph showing interaction extraction time (X3) and solvent-to-material ratio (X2); (c) contour plot graph showing interaction between extraction time (X3) and ethanol concentration (X1).
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