目的：制备一种苯乙烯类菁染料用于细胞活体荧光成像。方法将1,1,2-三甲基-1氢-苯并吲哚和4-吡啶苯甲醛反应得到苯乙烯类菁探针，考察pH对苯乙烯类菁探针荧光性能的影响，检测探针对细胞活性的影响，最后将苯乙烯类菁探针作为探针应用于活细胞成像。结果制备的苯乙烯类菁探针在中性和碱性条件下显示绿色荧光，在酸性条件下荧光发生由绿色变成橙色。该探针用于细胞活体成像荧光信号清晰可见。结论研制出了一种用pH敏感的苯乙烯类菁探针，该探针表现出了较好的细胞穿透性和细胞活体成像性能。%Objective To prepare a pH fluorescence probe based on styrylcyanine dyes for live cell imaging. Methods The Probe 1 was prepared by reaction of 4-pyridinecarboxaldehyde with 1,1,2-trimethylbenz[e]indole. The influence of pH on the fluorescent properties was examined, and the cell viability was examined using cell counting kit-8. The Probe 1 was used as a pH fluorescence probe in living cell. Results Probe 1 emitted green fluorescence under neutral and basic conditions but orange fluorescence under acid condition. Probe 1 selectively stained the cytoplasmic regions of living cells without significantly affecting the cell viability. Conclusion The pH-sensitive fluorescent probe prepared based on styrylcyanine possesses good ability of cell membrane permeation for live cell fluorescent imaging.
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