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  Indian J Med Microbiol
 

Figure 3: Response surface plots showing the effects of the independent variables tested on the yield of arctigenin extraction (a) Enzyme concentration and ultrasound time. (b) Enzyme concentration and extraction temperature. (c) Ultrasound time and extraction temperature. For each reponse surface plot the levels for the factors are held at their central values

Figure 3: Response surface plots showing the effects of the independent variables tested on the yield of arctigenin extraction (a) Enzyme concentration and ultrasound time. (b) Enzyme concentration and extraction temperature. (c) Ultrasound time and extraction temperature. For each reponse surface plot the levels for the factors are held at their central values