四甲基偶氮唑盐比色法测定Vero毒素-1的CD50
3 讨论
活细胞在生长和增殖过程中,线粒体内的脱氢酶可以将黄色的四甲基偶氮唑盐分解成蓝紫色的Fonnazan,生成的Fonnazan量的多少与细胞的数量和细胞的活性成正比。但是,Fonnazan不溶于水,溶于有机剂[10,11]。本实验室在细胞加入四甲基偶氮唑盐,经培养产生Fonnazan后采用二甲基亚枫裂解细胞,并将沉淀在细胞内的不溶性Fonnazan溶解,然后才能测定其OD值。
本实验根据活细胞的这一特征,建立了测定vero毒素-1 CD50的四甲基偶氮唑盐法,该方法与传统的3H-Tdr掺入法相比有许多的优点,如方法简便、避免使用同位素以及结果容易读取等;与肉眼目测法相比,该方法重复性好,不受实验者工作经验等主观因素的影响。本方法同样适用于其他毒素细胞毒性的测定,值得推广。
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