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Effect of ultrasond power (a), ultrasond time (b) and ultrasound temperature (c) on browing value of ovalbumin. The corresponding plots and three-dimensional plots of the three variables (A: ultrasound power; B: ultrasound time; C: ultrasound temperature) on the response (degree of glycation). Values that do not bear the same letter are significantly different (P < 0.05), and error bars represent the standard deviations.
