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Figure 3.
Response surface plots for the decrease of free amino groups in casein plasteins (Y) as a function of reaction temperature (X 1), substrate concentration (X 2) and reaction time (X 3). (a) response surface of substrate concentration and reaction temperature at X 3 = 0; (b) response surface of reaction time and temperature at X 2 = 0; and (c) response surface of reaction time and substrate concentration at X 1 = 0.