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Carbon Dot-Zif-67-Infused Tragacanth Hydrogel Films: Leveraging Tunable Luminescence Through Displacement Mechanisms for Anthrax Detection Publisher Pubmed



Norouzi S1 ; Esmaeili A1 ; Dashtian K1 ; Zaredorabei R1, 2 ; Mahdavi M3 ; Noroozifar M2 ; Kerman K2
Authors
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Authors Affiliations
  1. 1. Research Laboratory of Spectrometry & Micro and Nano Extraction, Department of Chemistry, Iran University of Science and Technology, Tehran, 16846-13114, Iran
  2. 2. Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, M1C 1A4, ON, Canada
  3. 3. Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran

Source: Microchimica Acta Published:2025


Abstract

A novel method for 2,6-Pyridine dicarboxylic acid (DPA) detection is introduced using red emissive carbon dots (r-CDs) derived from amaranth leaves and Eosin Yellow (EY), encapsulated within a Co-based MOF (ZIF-67). The approach utilizes ratiometric turn-on fluorescence and visual identification of DPA through a displacement assay, where the release of EY enhances its fluorescence intensity, while the fluorescence of r-CDs remains constant. The sensing platform demonstrates a wide detection range (10.0–280.0 μM) with limits of detection of 1.7 μM and 3.3 μM. The probe offers notable advantages, including simple preparation, high yield, stability, selectivity, and rapid detection. Additionally, a composite functional hydrogel, made from Tragacanth (TG), was developed for DPA detection in real samples (tap water and urine), showcasing excellent performance. Integration with smartphone-based on-site signal recording enables clear fluorescence visual changes, highlighting the potential for practical applications. This study presents an innovative r-CDs/EY-ZIF-67-based hydrogel film for fluorescence sensing of DPA, expanding the scope of high-performance fluorescent materials for anthrax monitoring and real-world applications. © The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature 2025.