Abstract
Graphene oxide–rhodamine B hydrazide (GO-RhB) nanocomposite was prepared by a simple chemical method and characterized by various spectroscopic and analytical techniques. GO-RhB nanocomposite potentially detects Cr3+ ion (excitation/emission = 550 nm/572 nm) via fluorescence turn “on–off” approach. This composite showed high binding affinity (106 M−1) with Cr3+ and a+ limit of detection (LOD) down to picomolar concentration (LOD = 85.6 pM). As far as we know, this is the first report for the sensing of Cr3+ ion at picomolar concentration. GO-RhB selectively senses Cr3+ ion without any interference of other coexisting metal ions. In addition, this composite exhibited the dynamic nature of quenching in the presence of Cr3+ ion, which is confirmed by the Stern–Volmer plot, fluorescence temperature profiles, and decay time experiments. The GO-RhB nanocomposite-based fluorescent probe was successfully applied to the quantitative detection of Cr3+ ion in milk sample (linear range = 2 to 10 nM) with better performance than other existing methods. Besides, this GO-RhB composite showed better antibiofilm activity against Acinetobacter baumannii and methicillin-resistant Staphylococcus aureus (MRSA) by using the Congo red agar and tube method.
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Funding
This work is supported by the SERB-EMR grant by the DST (Sanction No. SERB-EMR/2016/005692) and the Researchers Supporting Project number (RSP-2021/142), King Saud University, Riyadh, Saudi Arabia. The Center for Nanotechnology of Karunya Institute of Technology and Sciences supported the characterization techniques.
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Velmurugan, K., Bhuvanesh, N., Prakash, A.F. et al. Graphene oxide–rhodamine nanocomposite for picomolar detection of chromium(III) by fluorimetry and its biofilm inhibition. Microchim Acta 188, 414 (2021). https://doi.org/10.1007/s00604-021-05057-9
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DOI: https://doi.org/10.1007/s00604-021-05057-9