产品名称：钙黄绿素

CAS：154071-48-4

规格：10mg

储存条件：-15℃避光防潮

保质期：24个月

产品物理化学光谱特性

分子量：622.53

溶剂：DMSO

激发波长(nm)：495

发射波长(nm)：515

产品介绍

钙黄绿素*超纯级*是美国AAT Bioquest生产的钙指示剂 ，钙黄绿素，也称为荧光素，荧光素复合物，是一种荧光钙指示剂，其激发和发射波长分别为495和515nm。钙黄绿素在100 mM以上的浓度下会自动猝灭。它用作EDTA滴定钙离子和荧光测定钙的络合指示剂，微溶于水。质子解离常数为pKa1的= 2.1，pKa2 = 2.9，pKa3 = 4.2，pKa4 = 5.5，pKa5 = 10.8和pKa6 = 11.7。钙黄绿素溶液在酸性条件下发出黄绿色荧光，而在碱性条件下不发出荧光。但是，钙黄绿素在碱性条件下在金属离子（例如Al，Ba，Cu，Mg和Zn）存在下发出荧光。因此，钙黄绿素还可以用于除Ca之外的这些重金属离子的直接荧光滴定。

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