Abstract

Suphaluk Jarutikorn¹, Sasiwimon Kraithong², Jitnapa Sirirak¹, Waraporn Panchan³, Thanasat Sooksimuang³, Adisri Charoenpanich⁴ and Nantanit Wanichacheva*¹

DOI : http://dx.doi.org/10.13005/ojc/350345

A “turn on” fluorescent sensor based on 2-[4-(2-aminoethylthio)butylthio]ethanamine ionophore and [5]helicene fluorophores, MC4 was developed for detection of Ag+. An aqueous ethanol solution, an environmental friendly condition, was chosen as a working condition. MC4 exhibited Ag+–induced fluorescent enhancement with a low detection limit of 32 ppb for Ag+. The detection limit of the sensor was below the permissible concentrations of Ag+ for drinking water as regulated by the United States Environmental Protection Agency (U.S. EPA) and World Health Organization (WHO). Moreover, MC4 exhibited a strong fluorescent signal and expansive Stokes shift of 213 nm. This very expansive Stokes shift could reduce interferences from self-absorption and auto-fluorescence. The sensor also provided highly selective recognition of Ag+, distinguishing it from other competing ions through the photoinduced electron transfer (PET). Importantly, this sensor is able to track Ag+ in HepG2 cells, indicating that it shows good potential for practical applications.

Fluorescent Sensor; High Selectivity; Large Stokes Shift; Silver Sensor

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