FOOD SCIENCE ›› 2009, Vol. 30 ›› Issue (7): 57-59.doi: 10.7506/spkx1002-6630-200907012

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Characterization of Polyphenol Oxidase in Pericarp of Hylocereus undatus

ZHANG Fu-ping LIN Xiao-qiong   

  1. (Department of Biology, Hanshan Normal University, Chaozhou 521041, China)
  • Received:2008-05-19 Revised:2008-08-23 Online:2009-04-01 Published:2010-12-29
  • Contact: ZHANG Fu-ping E-mail:hsfpzh@126.com

Abstract:

The activity of polyphenol oxidase (PPO) in the pericarp of Hylocereus undatus and effect its various inhibitors were studied. The results showed that the optimum pH and temperature of this enzyme are 7.0 and 40 ℃, respectively. The PPO activity is positively correlated to substrate concentration and various inhibition effects of NaHSO3, vitamin C, L-Cys and citric acid are found towards this enzyme and decrease in the following order: NaHSO3 > vitamin C > L-Cys > citric acid. The higher the vitamin C concentration, the more obvious the inhibitory effect.

Key words: Hylocereus undatus, polyphenol oxidase, activivty, inhibitors

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