Rhodamine 123 (罗丹明123, Rh 123)是一种常用的阳离子绿色荧光染料，可以透过细胞膜从而在活细胞线粒体内聚集，并发出黄绿色荧光，可广泛用于检测线粒体膜电位，并且对细胞没有任何毒性。
另外，Rh123与常规蛋白染料PE-Cy5和AMCA(7-amino-4-methylcoumarin-3-acetic acid)等没有荧光干扰，因此可用于多标实验。
| 中文名称（Chinese Synonym） | 罗丹明123 |
| 英文名称（English Synonym） | 2-(6-Amino-3-imino-3H-xanthen-9-yl)benzoic acid methyl ester, hydrochloride |
| 分子式（Molecular Fomular） | C21H17ClN2O3 |
| 分子量（Molecular Weight） | 380.82 |
| CAS号（CAS NO.） | 62669-70-9 |
| 纯度（Purity） | ≥98%（HPLC） |
| Ex/Em | 507 nm/529 nm |
| 结构式（Structure） |  |
室温运输和保存即可。有效期至少一年。
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