8-Hydroxyquinoline based novel fluorogenic sensor for Sensitive and selective Cd2+ detection and its Applications: Soil, Foodstuffs, smartphone and living cell

Abstract

Cadmium is extensively utilized in various fields, mostly in industry and agriculture. Cadmium contamination of food, water, and soil can lead to major issues, like metabolic diseases and environmental degradation. The detection of cadmium is important due to these problems. In this study, an uncomplicated, efficient, and reversible fluorogenic sensor, HQM (2-amino-3-(((8-hydroxyquinolin-7-yl)methylene)amino)maleonitrile), composed of 7-formyl-8-hydroxyquinoline linked to diaminomalonitrile, was created for the determination of Cd²⁺. the sensor exhibited high selectivity for Cd²⁺ among various metal ions. The detection limit of HQM for Cd²⁺ was calculated as 0.25 µM. Application experiments on soil, foodstuffs, and living cells demonstrated the effective in-situ detection capabilities of HQM for Cd²⁺, indicating its promising potential for simple, rapid, and in-situ monitoring of Cd²⁺ in solutions.