Record number :
1464166
Title of article :
Gel electrophoresis of polyphenol oxidase with instant identification by in situ blotting
Author/Authors :
Cheng، نويسنده , , Tsai-Mu and Huang، نويسنده , , Pei-Chen and Pan، نويسنده , , Ju-Pin and Lin، نويسنده , , Kuan-Yu and Mao، نويسنده , , Simon J.T.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
6
From page :
331
To page :
336
Abstract :
Polyphenol oxidase (PPO) or tyrosinase is an important and ubiquitous enzyme responsible for browning in plants and melanization in animals. The molecular size of the plant PPO is varied among the species and its activity can be enhanced by a variety of anionic detergents. In the present study, we developed a simple method for the first-step identification of PPO in fruit and vegetable extracts. First, 3 mm chromatographic paper was immersed in 0.5% (w/v) catechol solution as an immobilized PPO substrate. After running the extract with 10% sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE), one side of the glass plate was removed. The plate was immediately laid on top of the dried catechol-paper. A dark-brown band corresponding to PPO was visualized within 1 min and was further confirmed by a conventional Western blot using an antibody prepared against mushroom PPO. It also reveals that some vegetation (such as tomato, radish, and oriental melon) with low or no detectable activity in a conventional enzyme assay actually possessed marked levels of PPO activity when assessed by PAGE-blot. We propose that an inhibitor is associated with PPO in some plants; the inhibitor, however, is dissociated during the electrophoresis. Therefore, in addition to identify the molecular form of PPO, the present technique may explore the existence of PPO inhibitor(s) in plants. The detail of the method with respect to its relevance for searching a natural PPO inhibitor is described and discussed.
Keywords :
tyrosinase , Catechol , Immobilized-paper , Browning reaction , Natural PPO inhibitor , Polyphenol oxidase
Journal title :
Journal of Chromatography B
Journal title :
Journal of Chromatography B
Serial Year :
2007
Link To Document :
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