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Glyco-conjugated metal–organic framework biosensor for fluorescent detection of bacteria

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Abstract

Metal–organic frameworks (MOFs) are hybrid materials constructed by the linkage between an inorganic secondary building unit and an organic linker. A number of MOFs are luminescent in nature and can be structurally tuned for desirable geometry, surface functionality, and porosity. Luminescent MOFs have been endorsed for various biosensing applications. Lectins and carbohydrates have been used for the development of simple and convenient biosensing and bioimaging tools. Lectins are mostly present on the surface of microorganisms where they aid in pathogenesis. Due to this, they can be potential targets for a microbial biosensor. The present study, for the first time, explores the usage of a carbohydrate-conjugated FeMOF (Glyco-MOF) bioprobe for the selective determination of Pseudomonas aeruginosa and Escherichia coli. NH2-MIL-53(Fe) MOF was synthesized via a room temperature protocol and separately conjugated with galactose and mannose sugars via glutaraldehyde chemistry. The synthesized bioprobe is validated for structural integrity, luminescent nature, stability, and analyte assay. Electron microscopy studies validated the unhindered MOF’s morphology and structural integrity, after bioconjugation. The synthesized bioprobes were able to detect P. aeruginosa and E. coli up to respective detection limits of 202 and 8 CFU/mL, respectively. The bioprobes are selective even in co-presence of possible interferants as well as being environmentally stable.

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Acknowledgements

The authors are thankful to the Department of Biotechnology (DBT), India, for project grant IC-12025(11)/2020-ICD-DBT. We thank the Director, CSIR-CSIO, Chandigarh, for providing necessary infrastructure facilities.

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Authors and Affiliations

  1. Central Scientific Instruments Organisation (CSIR-CSIO), Sector 30-C, Chandigarh, 160030, India

    Deepanshu Bhatt, Shalini Singh & Akash Deep

  2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India

    Deepanshu Bhatt, Shalini Singh & Akash Deep

  3. National Agri-Food Biotechnology Institute (NABI), Sector 81, SAS Nagar, Mohali, Punjab, 140306, India

    Nitin Singhal

  4. Department of Biotechnology, University Institute of Engineering Technology (UIET), Panjab University, Chandigarh, India

    Neha Bhardwaj

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  1. Deepanshu Bhatt
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Bhatt, D., Singh, S., Singhal, N. et al. Glyco-conjugated metal–organic framework biosensor for fluorescent detection of bacteria. Anal Bioanal Chem 415, 659–667 (2023). https://doi.org/10.1007/s00216-022-04455-z

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  • DOI: https://doi.org/10.1007/s00216-022-04455-z

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