Polyphenol oxidase (tyrosinase) is a bifunctional, copper-containing oxidase having catecholase and cresolase activity. It is responsible for browning reactions through the phylogenetic scale. The enzyme has a molecular weight of 128 kDa. It is a tetramer containing four atoms of copper per molecule and two binding sites for aromatic compounds including phenolic substrates. There is a distinct binding site for oxygen. The optimum pH range is 6-7.
分子量：約128 KDa 。
適宜溫度25℃。
最佳PH：6.0～7.0。
技術(shù)規(guī)格
來源：Mushrooms (Agaricus bisporus)
性狀：A lyophilized powder.
酶活：≥500 units per mg dry weight
酶活定義：One unit causes an increase in the absorbance at 280 nm of 0.001 per minute at 25°C, pH 6.5, using L-tyrosine as substrate.
