Dual-emission ratiometric fluorescent sensor based on tannic acid carbon dots and eosin for selective detection of paraquat in water and food samples.

ABSTRACT: Paraquat, a highly toxic herbicide widely used in agriculture, poses severe health risks necessitating sensitive analytical methods for residue monitoring in environmental and food samples. This work presents a novel dual-emission ratiometric fluorescent sensor combining tannic acid-derived carbon dots (TA-CDs) and eosin for rapid paraquat detection. The dicationic paraquat simultaneously induces aggregation-enhanced fluorescence of TA-CDs at 445 nm while quenching eosin emission at 545 nm, generating a self-calibrated ratiometric signal (F ₄₄₅/F ₅₄₅). The TA-CDs were comprehensively characterized using TEM, Raman, FTIR, XPS, and spectroscopic techniques. Under optimized conditions, the sensor exhibited excellent linearity (5.0-150.0 nM, R ^2<

SUBMITTER: Goda MN 

PROVIDER: S-EPMC12604661 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature