Synthesis and application of a dual-functional fluorescent probe for sequential recognition of Zn2+and glyphosate

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 303; p. 123221
• Main Authors: Liu, Qiye, Yu, Yanchao, Wu, Mianyuan, Yan, Xuexue, Wu, Wenju, You, Jun
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.12.2023
• Subjects: Fluorescent probe; Glyphosate; OFF-ON-OFF; Practical application; Zinc ions; Practical application; Zinc ions; OFF-ON-OFF; Glyphosate; Fluorescent probe
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2023.123221

[Display omitted] •QL can complete double detection for Zn2+ and glyphosate.•QL exhibits high selectivity towards glyphosate.•QL shows promising prospects for practical applications. A novel fluorescent probe QL was designed and synthesized based on Schiff base by 2-hydrazinobenzothiazole to sequentially recognize Zn2+ and glyphosate. The probe QL was capable to detect Zn2+ in DMSO solution via fluorescence enhancement, and exhibited good selectivity and anti-interference ability. The combination mode was 1:2 between probe QL and Zn2+ according to the method of job’s plot, and the detection limit of probe QL for Zn2+ was found to be 4.51 × 10−8 M, which exhibited excellent sensitivity. Furthermore, the system QL-Zn2+ could detect glyphosate by causing fluorescence quenching response and with a color change from yellow to colorless for naked-eye detection. The detection limit for glyphosate was found to be 4.93 × 10−8 M, which was far below the Standards for Drinking Water Quality (GB5749-2006) acceptable limits (0.7 μg/mL for glyphosate). Notably, the probe QL and its complex QL-Zn2+ have been successfully applied to detect Zn2+ and glyphosate in water, respectively.