Note: Diffuse reflectance profiles of goat's milk during coagulation by various enzymes / Nota: Evolución de la reflectancia difusa durante el proceso de coagulación de la leche de cabra con diferentes enzimas coagulantes

The behaviour of different coagulant enzymes during the coagulation of goat's milk was studied by diffuse reflectance. During the first 5 min a decrease was observed in the diffuse reflectance profile which correlated with the recorded decrease in viscosity measurements; this decrease was followed by a continuous increase in the reflectance value. The milk clotting time for all the enzymes studied can be calculated from a plot of the first derivative of the diffuse reflectance value vs time by assuming the maximum value of the first derivative. There were no significant differences (p ≤ 0.05) between the milk clotting time determined by diffuse reflectance and the value obtained using the Berridge method.