Synthesis and evaluation of colorimetric chemosensors for monitoring sodium and potassium ions in the intracellular concentration range
作者:Thorfinnur Gunnlaugsson、Joseph P. Leonard
DOI:10.1039/b207551m
日期:2002.12.6
The azo-dye based colorimetric chemosensors 1 and 2 were designed for the detection of intracellular concentrations of Na+ and K+ respectively. The two sensors were synthesised from the o-anisidine based receptors 3 and 4 in a one step synthesis. Both displayed good selectivity and sensitivity for the relevant group I cations in the appropriate physiological conditions, with 1 displaying large changes in the absorption spectra upon Na+ recognition with λmax being shifted from 488 nm to 377 nm in the absorption spectra when measured in 50 ∶ 50 MeOH–H2O buffered pH 7.4 solutions and in the presence of high ionic strength. Similarly, 2 showed both a hypsochromic shift and hypochromic effect upon titration with K+. These changes were clearly visible; with red to yellow colour changes taking place upon ion recognition.
基于偶氮染料的比色化学传感器1和2分别用于检测细胞内Na+和K+的浓度。这两种传感器由基于邻氨基苯甲醚的受体3和4一步合成。在适当的生理条件下,它们对相关的I类阳离子均表现出良好的选择性和敏感性,其中1在识别Na+时吸收光谱发生了较大变化,在50∶50甲醇-水缓冲溶液(pH 7.4)中测量时,吸收光谱的最大吸收波长从488 nm变为377 nm,并且存在高离子强度。同样,2在滴定K+时也表现出色度向低色度的变化。这些变化清晰可见,在识别离子时,颜色从红色变为黄色。