DAB即二氨基联苯胺(3,3’-diaminobenzidine),辣根过氧化物酶(Peroxidase)最常用的生色底物,其显色原理是在过氧化氢的作用下失去电子而呈现出颜色变化和积累,形成棕色不溶性产物。该反应灵敏度高、特异性好,常用于免疫组化、原位杂交、Western Blot等膜显色或检测细胞或组织内源性的过氧化物酶。由于生成的显色产物不溶于乙醇,因此,在DAB显色后,还可以使用溶于乙醇的染料进行后续染色。可配合DAB染色使用的复染方法包括亚甲基蓝、甲基绿和苏木精。DAB,也称硒试剂,可用于分光光度法检测硒含量。
本品为四盐酸盐形式DAB,易溶于水,可制备成1%储存液,-20℃分装冻存。然后使用前用合适pH的缓冲液(pH7.0~7.6)稀释到工作液,并与过氧化氢(H2O2)工作液混匀,即得到完整的DAB显色液。
中文别名(Chinese Synonym) | 硒试剂;3,3’-二氨基联苯胺四盐酸盐 水合物 |
英文别名(English Synonym) | Tetrahydrochloride |
CAS号(CAS NO.) | 868272-85-9 |
分子式(Formula) | C12H14N4·4HCl·xH2O |
分子量(Molecular Weight) | 360.11 (anhydrous basis) |
熔点(Melting Point) | 328-330℃ |
外观(Appearance) | 灰色或深红色结晶粉末 |
纯度(Purity) | >98% |
溶解性(Solubility) | 溶于水,DMF,DMSO |
结构式(Structure) | ![]() |
-20℃干燥避光保存,有效期3年。
Q:该产品可用于哪些膜显色实验?
A:免疫组化、原位杂交、Western Blot 等。
Q:如何使用该产品配置工作液?
A:采用合适 pH 缓冲液(pH7.0~7.6)稀释到工作液即可。
Q:DAB 显色液可存放多久?
A:一般现用现配。
Q:染色颜色浅怎么办?
A:建议在显色液中添加适量镍离子,钴离子或银离子,以增强 DAB 的染色强度。
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