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To evaluate high-pressure processing combined with enzymatic treatment for extraction of Prunus mume by determining the optimum extraction conditions for the antimicrobial activity against oral bacteria. Highpressure enzymatic extraction was used to isolate biologically active components from P. mume. The effects of process variables such as enzyme type (Pectinex Ultra SP-L, Novozym 33095 and Viscozyme L), enzyme concentration, incubation time/temperature, pH, and ratio of enzymes antimicrobial activity against oral pathogens related to dental caries and periodontal diseases were determined by disk diffusion assay. The optimal conditions for enzymatic extraction from P. mume were pH 6.0, 45°C, 20 h, and 5 v/v% with Pectinex Ultra SP-L. The maximum antimicrobial activity of P. mume extract obtained using Novozym 33095 was at pH 7.0, 45°C, 20 h, and 5 v/v%. The Viscozyme L extract showed the maximum inhibitory effect at pH 6.0, 45°C, 20 h, and 5 v/v%. Use of combinations of enzymes did not result in significantly different antimicrobial activity (p < 0.05) compared with each enzyme alone. Minimum inhibitory concentration values were 3.125 to 12.50%. These results indicated that high-pressure enzymatic extraction yielded P. mume extract with antimicrobial activity which has the potential for improving oral environment.

Antimicrobial effect against oral bacteria on bioactive compounds in a high-pressure enzymatic Prunus mume extract