Fig. 3. Emulsion stability prediction, by the Doehlert experimental design, for grape
seed tannins G15ox at 0.3% (w/v) in phosphate buffer 75 mM at (a) pH 4.0, (b) pH
6.0, and (c) pH 8.0. The total volume is 10 mL. The green lines represent the
predicted value of emulsified volume, whereas the red lines represent the 95%
confidence interval. (For interpretation of the references to color in this figure
legend, the reader is referred to the web version of this article.)