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Influence of time and power of ultrasound radiation and papain hydrolysis on pH value. 100 W: ultrasonic power of 100 W; 300 W: ultrasonic power of 300 W; 100 W, E: simultaneous treatment with papain enzyme and ultrasonic power of 100 W; 300 W, E: simultaneous treatment with papain enzyme and ultrasonic power of 300 W. Dissimilar letters indicate significant difference (p < 0.05)
