噻唑兰（Methylthiazolyldiphenyl-tetrazolium bromide, MTT），也称作溴化噻唑蓝四氮唑，是一种黄色染料，已经普遍替代传统的台盼蓝染色法或者放射性同位素插入法，用来检测细胞的活力，细胞增殖以及细胞毒性分析。检测原理在于：MTT是一种可接受氢离子的化合物染料，带正电荷，具有细胞膜渗透性。活细胞线粒体中的琥珀酸脱氢酶能够将外源进入的MTT还原成为水不溶性的深蓝色MTT-甲臜结晶，而死细胞不具有此功能。甲臜结晶是不能穿透细胞膜，因此沉积在处于增殖且未受损伤的细胞内。甲臜结晶可用DMSO或者酸化的异丙醇溶解出来，酶标仪下测定570 nm的吸光度反映甲臜的生成量。而甲臜的生成量与活细胞数目成正比，用以评估细胞存活状况。
本试剂盒以MTT（高纯度）作为指示剂，在经典操作步骤的基础上，采用独特的甲臜溶解液配方，可以直接溶解甲臜沉淀，无需去除原有的培养液。从而避免因去除培养液时甲臜被部分去除而引起的操作误差。具有本底低，灵敏度高，线性范围宽，操作简单等特点。另外，本试剂盒还提供配套的一次性针头过滤器和注射器，为实验带来更多的便利。
冰袋运输。
收到产品后，取出除菌套装室温保存，其他组分4℃保存。甲臜溶解液也可以放到室温保存。一年有效。
Q：MTT 配置成工作液后的使用注意事项？
A：MTT 配制成溶液后为黄色，需避光保存，长时间光照会导致失效。当颜色变为灰绿色时， 请勿使用。MTT 溶液在 4℃、冰浴等较低温度情况下会凝固，可以 20-25℃水浴温育片刻至全部融解 后使用。
Q：配好的 MTT 溶液是否需要过滤？
A：无需过滤。
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