The substrate specificity and the Michaelis-constant (Km) of polyphenoloxidase (PPO) in Nanguoli pear were studied.The results showed that the optimum substrate for the PPO was chlorogenic acid.

• 研究了南果梨多酚氧化酶的底物专一性和不同底物的米氏常数,结果表明,最适底物为绿原酸。