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Response surface plots of pectin methylesterase activity of fruit smoothie thermosonicated a amplitude (X1) and time (X2), b amplitude (X1) and temperature (X3), and c time (X2) and temperature (X3). Response surface plots of d amplitude (X1) and time (X2), e amplitude (X1) and temperature (X3), f time (X2) and temperature (X3) on polyphenol oxidase activity of fruit smoothie thermosonicated
