Engineering a Smart Nanofluidic Sensor for High-Performance Peroxynitrite Sensing through a Spirocyclic Ring Open/Close Reaction Strategy
Yangyan Li, Le Tuan Tu, Xin Ma, Huan Chen, Yifan Fan, Qiang Zhou, Yao Sun
Abstract
Peroxynitrite (ONOO–) is an important reactive oxygen/nitrogen species that participates in a range of physiological and pathological processes by modulating ion flux through biological channels. Inspired by a ONOO–-regulated K+ channel in vivo, herein, we describe the construction of a smart ONOO–-driven nanosensor using a spirocyclic ring open/close reaction approach. The prepared nanosensor possessed a prominent ONOO– selectivity and sensitivity and rapid response (∼90 s) owing to the specific reaction between ONOO– and ligands on the nanosensor surface with a high ion rectification ratio (∼10) and ion gating ratio (∼4). Moreover, this nanosensor system also exhibits excellent stability and recyclability. Thus, these results will provide a new direction for the design of nanochannel-based sensors for future practical and biological applications.