Optimization of Gentisides Extraction from Gentiana rigescens Franch. ex Hemsl. by Response Surface Methodology

Figure 4

2D contour plots and 3D response surface plots of the effects on relationships between independent variables and response value; ((a) and (b)) 2D contour and 3D plot of the interactions between extraction time and extraction temperature; ((c) and (d)) 2D contour and 3D plot of the interactions between extraction temperature and the ratio of liquid to material; ((e) and (f)) 2D contour and 3D plot of the interactions between extraction time and the ratio of liquid to material.

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