Optimization of Ultrasonic and Microwave Asssisted Extraction Process for Phytosterol from Maize Silk
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Abstract:
In order to optimize ultrasonic and microwave assisted extraction process for phytosterol from maize silk, effects of ultrasonic time, ultrasonic power, ratio of solid-liquid and microwave time on phytosterol extraction rate from corn stigma were evaluated. Based on single factor tests, Box-Behnken experimental Design was used and a regression model was established by Response Surface method. Results showed that optimum process conditions were as follows: ultrasonic time 55.00 min, ultrasonic power 200 W, solid-liquid rate 1:40 (g/mL) and microwave time 16 min. Under these conditions, 0.76% of phytosterol extraction rate was obtained. Tested and predicted values for phytosterol extraction rate were similar basically. The results contributed to the development of phytosterol from maize silk.
