Purification and Characterization of Polyphenol Oxidase from Jackfruit (Artocarpus heterophyllus) Bulbs

被引:42
作者
Tao, Yi-Ming [1 ,2 ]
Yao, Le-Yi [1 ]
Qin, Qiu-Yan [1 ]
Shen, Wang [1 ]
机构
[1] Guilin Med Univ, Coll Biotechnol, Guilin 541004, Peoples R China
[2] Guilin Med Univ, Inst Biomed, Guilin 541004, Peoples R China
基金
中国国家自然科学基金;
关键词
polyphenol oxidase; jackfruit; purification; inhibition; antibrowning; KINETIC CHARACTERIZATION; INHIBITION; FRUIT; PEROXIDASE; ACID; L; INACTIVATION; SUBSTRATE; BINDING; LEAVES;
D O I
10.1021/jf403828e
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Polyphenol oxidase (PPO) from jackfruit bulb was purified through acetone precipitation, ion-exchange column, and gel filtration column. PPO was a dimer with the molecular weight of 130 kDa determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and gel filtration. The K-m was 8.3 and 18.2 mM using catechol and 4-methylcatechol as substrates, respectively. The optimum pH was 7.0 (catechol as the substrate) or 6.5 (4-methylcatechol as the substrate). The optimum temperature was 8 degrees C. The enzyme was stable below 40 degrees C. The activation energy (E-a) of heat inactivation was estimated to be 103.30 kJ/mol. The PPO activity was activated by Mn2+, SDS, Tween-20, Triton X-100, citric acid, and malic acid but inhibited by K+, Zn2+, Mg2+, Ca2+, Ba2+, cetyl trimethyl ammonium bromide (CTAB), kojic acid, tropolone, glutathione (GSH), cysteine (Cys), and ascorbic acid (AA). Cys and AA were effective to reduce browning of jackfruit bulbs during the storage at 8 degrees C for 15 days.
引用
收藏
页码:12662 / 12669
页数:8
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