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  Indian J Med Microbiol
 

Figure 4: Response surface plots showing the effect of different variables on the extraction rate of polyphenols ((a) Extraction time and ultrasonic power, (b) Extraction time and alcohol concentration, (c): Ultrasonic power and alcohol concentration)

Figure 4: Response surface plots showing the effect of different variables on the extraction rate of polyphenols ((a) Extraction time and ultrasonic power, (b) Extraction time and alcohol concentration, (c): Ultrasonic power and alcohol concentration)