Green synthesis of copper nanoclusters using Cissusquadrangularis leaves extract and cysteine as cooperative ligandsfor the detection of Fe3+ ion and 2,6-dipicolinic acid in biofluids via fluorescence turn off–on mechanism

[Display omitted] •Greenish-blue-emitting CuNCs were prepared from leaves extract of Cissusquadrangularis and cysteine.•CuNCs showed λEx/Em at 370/491 nm.•CuNCs acted as an “off–on” fluorescence sensor for Fe3+ ion and DPA sensing.•The developed probe displayed LODs of 0.125 μM and 0.38 μM for Fe3+...

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Bibliographic Details
Published in:Journal of molecular liquids 2024-09, Vol.409, Article 125438
Main Authors: Harshita, Jha, Sanjay, Basu, Hirakendu, Park, Tae-Jung, Kailasa, Suresh Kumar
Format: Article
Language:English
Subjects:
C. quadrangularis-Cys-CuNCs
DPA
Fe3+ ion
Fluorescence spectroscopy and Water samples
Off-on fluorescent sensor
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Summary:[Display omitted] •Greenish-blue-emitting CuNCs were prepared from leaves extract of Cissusquadrangularis and cysteine.•CuNCs showed λEx/Em at 370/491 nm.•CuNCs acted as an “off–on” fluorescence sensor for Fe3+ ion and DPA sensing.•The developed probe displayed LODs of 0.125 μM and 0.38 μM for Fe3+ and DPA, respectively.•This method was effectively applied to quantify Fe3+ ion in water samples. An off–on fluorescent sensor is devised by using greenish-blue light-emitting Cissusquadrangularis-cysteine-CuNCs (C. quadrangularis-Cys-CuNCs) for the rapid, precise, and recognition ofFe3+ ion and 2,6-dipicolinic acid (DPA). The structure, size, surface functionalities and oxidation state of the elements present in C. quadrangularis-Cys-CuNCs are confirmed by high-resolution transmission electron microscopy (HR-TEM), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopic and X-Ray diffraction (XRD) techniques. The as-synthesized C. quadrangularis-Cys-CuNCs exhibited λEm/Ex at491/370 nm. The fluorescence intensity ofC. quadrangularis-Cys-CuNCs was reduced selectively to 63 % by Fe3+, however it was restored with the addition of DPA. This method exhibited the limits of detection (LODs) of 0.125 and 0.38 μM for Fe3+ and DPA, respectively. The C. quadrangularis-Cys-CuNCs based fluorescence turn-off–on sensing platform showed remarkable performance for the analyses of Fe3+ ion and DPA in real samples, revealing great potentiality of the method for practical applications.
ISSN:0167-7322
DOI:10.1016/j.molliq.2024.125438