Asymmetric cyanine compounds represented by general formula I are provided, wherein X, n, R
1
, R
2
, R
3
, R
4
and Y
−
are as defined in the specification. They have a maximum absorption peak at about 640 nm which may not change with ambient temperature. When the compounds bind a nucleic acid to form a dye/nucleic acid complex, the fluorescence intensity of the complexes will increased rapidly, so that they can be used as a staining agent for nucleic acids in flow cytometers. Their spectra are in the near-infrared region, which can effectively reduce the interference from background fluorescence and improve the accuracy of detection. Moreover, the compounds provided can also be used as a staining agent for blood reticulocytes.
提供了由通式I表示的不对称青菁化合物,其中X、n、R1、R2、R3、R4和Y−如规范中定义。它们在约640 nm处具有最大吸收峰,该峰可能不随环境温度变化。当化合物与
核酸结合形成
染料/
核酸复合物时,复合物的荧光强度将迅速增加,因此它们可以用作流式细胞仪中
核酸的染色剂。它们的光谱位于近红外区域,可以有效减少背景荧光的干扰,提高检测的准确性。此外,所提供的化合物还可以用作血液网织红细胞的染色剂。