Hoechst 33258(赫斯特荧光染色液)是一种可以穿透细胞膜的蓝色荧光染料，它在嵌入双链 DNA 后释放强烈的蓝色荧光，对细胞的毒性较低。Hoechst 33258 常用于细胞凋亡检测，染色后用荧光显微镜观察或流式细胞仪检测，也可以用于普通的细胞核染色，或常规的DNA染色。
用于细胞核染色时，推荐的Hoechst 33258工作浓度为0.5-10 μg/mL。
| 中文名称（Chinese Synonym） | 二苯甲亚胺, 三氯化氢 2'-(4-羟基苯基)-5-(4-甲基-1-哌嗪基)-2,5'-二-1H-苯并咪唑 |
| 英文名称（English Synonym） | 2’-(4-Hydroxyphenyl)-5-(4-methyl-1-piperazinyl)-2,5’-bi-1H-benzimidazole,Trihydrochloride；bisBenzimide H 33258; HOE 33258 |
| 分子式（Molecular Formula） | C25H24N6O·3HCl |
| 分子量（Molecular Weight） | 533.88 |
| CAS号（CAS NO.） | 23491-45-4 |
| 荧光光谱（Fluorescence Spectral） | Hoechest 33258的Ex/Em=346/460; Hoechest 33258-核酸的 Ex/Em=350/460; 荧光可用氙气灯，泵弧灯或者UV激光激发；可用DAPI滤光器、蓝色GFP滤光器、Alexa Fluor 350滤光器等检测。 |
| 纯度（Purity） | ≥95%（HPLC） |
| 结构（Structure） |  |
冰袋（wet ice）运输。-20℃干燥避光保存，有效期2年。
Q:如何做到同时染色溶酶体和细胞核的？
A:建议用 Hoechst 33258/ Hoechst 33342 染色细胞核，这个染料可以直接染活细胞不需要固定操作。
Q．DAPI和Hoechst染料相当类似，如何二选一？
A：DAPI是非常通用的蓝色荧光染料，用于细胞核复染。对固定和透化的细胞/组织，具有非常明亮的细胞核标记。然而，此染料被认为是半渗透至不渗透的染料，用于活细胞染色的结合不一致。Hoechst 33342是一种细胞膜渗透性的染料，具有同DAPI的结合机制和荧光特征。非常适合用于活细胞成像，效果就如同DAPI用于固定细胞染色。
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