作者:Nazmiye B. Yapici、Srinivas Rao Mandalapu、Teng-Leong Chew、Satya Khuon、Lanrong Bi
DOI:10.1016/j.bmcl.2012.02.021
日期:2012.4
We synthesized and evaluated a series of acidic fluorescent pH probes exhibiting robust pH dependence, high sensitivity and photostability, and excellent cell membrane permeability. Titration analyses indicated that probe 3 could increase its fluorescence intensity 800-fold between pH 8.0 and 4.1. Additionally, its pK(a) value is optimal for intracellular probing of acidic organelles. Fluorescent imaging of HepG2 and Hela cells further revealed that probe 3 demonstrates outstanding capacity for monitoring of intracellular [H+] levels. The easily accessible terminal alkyne/azido function groups of these probes offer the possibility of rapidly constructing sensor molecule libraries using 'click' chemistry. Published by Elsevier Ltd.