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Effects of ultrasound-assisted processes on the extraction yield of PCRCP and the plots of response surfaces analyses (three replicates). (A-E) Effects of liquid-to-solid ratios, pH, temperature, ultrasonic power and ultrasonic time on the yields of PCRCP. (F-J) Response surface diagram and (K-O) contour plots of the interaction of different variables on the yields of PCRCP.
