Figure 1From: Combining phospholipases and a liquid lipase for one-step biodiesel production using crude oilsPrediction profile for citric acid obtained from RSM analysis. Graphical plotting of the effect of citric/phosphoric acid, pH, and extra NaOH on FAME production, made with JMP software (SAS Institute Inc.) (Rs = 0.88). FAME, fatty acid methyl ester; RSM, response surface methodology.Back to article page