Ultrasonic Assisted Extraction of Kelp Polyphenols and Analysis of Its Antibacterial Activity
The Box-Behnken experimental design, optimized the ultrasonic extraction kelp polyphenols tech-nology research. The optimum extraction process were as follows:30%ethanol concentration, liquid to sol-id 40:1 (mL/g), 32 min ultrasonic time, ultrasonic temperature 35℃, under the above optimum conditions, the extraction rate of kelp polyphenols reached up to 4.485 mg/5 g. Bacteriostatic experiment showed that:kelp polyphenols could inhibite Escherichia coli, Bacillus subtilis and Staphylococcus aureus, the bacteriostatic ef-fects of yeast was smaller;the minimum bacteriostasis concentration to E.coli and wine yeast were 5 mg/mL, the minimum bacteriostasis concentration to Bacillus subtilis was 1.25 mg/mL, the minimum bacteriostasis concen-tration to Staphylococcus aureus was 2.5 mg/mL.
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