Deprecated: Function split() is deprecated in /home/hualanchemlhfu9a8l2a2n4cshvetm/wwwroot/goods.php on line 366 Strict Standards: Non-static method cls_image::gd_version() should not be called statically in /home/hualanchemlhfu9a8l2a2n4cshvetm/wwwroot/includes/lib_base.php on line 346
- 分子量约128 KDa 。
- 比活力:≥500units/mg protein。
- 活力定义:在含有L-二羟苯丙氨酸或儿茶酚和L-抗坏血酸的3ml反应混合液中,在pH值6.5,25℃时,每1min内ΔA265变化为0.001为一个酶活单位。
- 适宜温度25℃。
- 最佳PH:6.0~7.0。
- 性状:粉末。
- 介绍:可催化含酚基化合物(如酪氨酸、酚类化合物等)氧化成醌的酶。此类酶广泛存在于自然界,植物中分布很广,如马铃薯、茶叶、漆树乳汁中含量相当高。高等动物的皮肤、毛发、角膜中的黑色素也是由于此酶氧化酪氨酸所生成的产物。蘑菇等菌类及其他微生物中也产生此类酶。通常从野蘑菇中提取,系生物催化剂之一,含有铜离子的蛋白质。等电点<5.0;含氮量约13.6%。含铜量约0.25%。紫外吸收峰在273nm和330nm处。
- 储存条件: -20℃
- 用途: 它催化酪氨酸氧化成多巴和多巴进一步氧化成能产生黑色素的前体物——多巴醌。
产品编号 3789
中文名称 多酚氧化酶,酪氨酸酶
英文名称 Polyphenol Oxidase (Tyrosinase)
生物活性 1500 units per mg dry weight
包装规格 25 ku
生物来源 Mushrooms
储存条件 Store at 2-8 °C.
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.
A lyophilized powder
Strict Standards: Only variables should be passed by reference in /home/hualanchemlhfu9a8l2a2n4cshvetm/wwwroot/includes/cls_template.php on line 422 Strict Standards: Only variables should be passed by reference in /home/hualanchemlhfu9a8l2a2n4cshvetm/wwwroot/includes/cls_template.php on line 422 Strict Standards: Only variables should be passed by reference in /home/hualanchemlhfu9a8l2a2n4cshvetm/wwwroot/includes/cls_template.php on line 422 Strict Standards: Only variables should be passed by reference in /home/hualanchemlhfu9a8l2a2n4cshvetm/wwwroot/includes/cls_template.php on line 422