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http://dx.doi.org/10.3746/jkfn.2011.40.10.1447

Purification and Characterization of Polyphenol Oxidase from Oyster Mushroom (Pleurotus ostreatus)  

Choi, Ju-Hee (Dept. of Food Engineering and Solar Salt Biotechnology Research Center, Mokpo National University)
Kim, Hyun-Jin (Korea Food Research Institute)
Park, Sun-Young (Dept. of Food Engineering and Solar Salt Biotechnology Research Center, Mokpo National University)
Ham, Kyung-Sik (Dept. of Food Engineering and Solar Salt Biotechnology Research Center, Mokpo National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.40, no.10, 2011 , pp. 1447-1452 More about this Journal
Abstract
Polyphenol oxidase (PPO) isoforms were partially purified from oyster mushroom (Pleurotus ostreatus) using various chromatography techniques, and their characteristics of heat stability, substrate affinity, optimum pH, and optimum temperature were investigated. Three PPO isoforms named PO-I, PO-II-1, and PO-II-2 were partially purified from oyster mushroom. The molecular weight of PO-II-1 was 70 kDa and PO-I and PO-II-2 were less than 6 kDa each. Characterization was carried out using a PPO isoform partially purified by hydrophobic interaction chromatography. Optimum temperature was $55^{\circ}C$ and optimum pH 5.0. However, the PPO was inactivated at neutral pH or by heating at $80^{\circ}C$ for 30 min, while the 40% PPO still remained active after heating at $60^{\circ}C$ for 45 min. The PPO isoform showed the highest substrate affinity to chlorogenic acid and pyrogallol, in which KM values were 1.01 and 2.06 mM, respectively. Therefore, these results suggested that the mushrooms should be stored at a pH higher than 7.0 and at a low temperature to prevent enzymatic browning.
Keywords
oyster mushroom; polyphenol oxidase; purification; characterization;
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