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Updated: Jun 25, 2025
Author Spotlight: Metallic Nanocomposites to Eliminate Antibiotic-Resistant Bacteria
Published on: October 4, 2024
Multi-Faceted Antimicrobial Efficacy of a Quinoline-Derived Bidentate Copper(II) Ligand Complex and Its Hydrogel
Samya Sen1, Surojit Ghosh2, Aniket Jana2
1iHUB Drishti Foundation, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India.
Abstract:
The emergence of antimicrobial resistance, exemplified by methicillin-resistant Staphylococcus aureus (MRSA), poses a grave threat to public health globally. Over time, MRSA has evolved resistance to multiple antibiotics, challenging conventional treatment strategies. The relentless adaptability of MRSA underscores the urgent need for innovative and targeted antimicrobial approaches to combat this resilient pathogen. Ancient knowledge and practices, along with scientific evidence, have established that metallic copper, and its organic coordination complexes can act as potential antibacterial substances. In search of a smart and effective antimicrobial against MRSA, we designed, synthesized, and characterized a bidentate copper(II) ligand complex (SG-Cu) utilizing a comprehensive array of analytical techniques, including ESI-MS, elemental analysis, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, and others. Antibacterial efficacy and mechanism of action of the complex were assessed through bacterial growth analyses, bacterial membrane perturbation assays, ROS elicitation assays, and field emission scanning electron microscopy. SG-Cu was found to maintain robust biocompatibility against the mammalian cell lines HEK-293, WI-38, and NIH/3T3. Remarkably, SG-Cu demonstrated significant biofilm disruptive tendency evidenced by the retardation of sliding motility, reduction in slime production, reduction in biofilm viability, and enhanced biofilm eradication, both in vitro and in urinary catheters. In vivo studies on murine excisional wounds, with SG-Cu impregnated in a palmitic acid conjugated NAVSIQ hexapeptide (PA-NV) hydrogel, revealed the sustained release of SG-Cu from the gel matrix, facilitating accelerated wound healing and effective wound disinfection. This multifaceted investigation highlights the potential of SG-Cu as a versatile option for combating MRSA infections and promoting wound healing, solidifying its claim to be developed into a viable therapeutic.
Insights
A novel copper complex, SG-Cu, shows potent antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA). It effectively disrupts biofilms and promotes wound healing with minimal toxicity, offering a promising therapeutic candidate.
Area of Science:
- Materials Science and Chemistry
- Microbiology
- Biomedical Engineering
Background:
- Antimicrobial resistance, particularly from methicillin-resistant Staphylococcus aureus (MRSA), is a critical global health challenge.
- Conventional treatments are increasingly ineffective against adaptable pathogens like MRSA.
- Copper compounds have demonstrated antibacterial properties, suggesting potential for novel antimicrobial development.
Purpose of the Study:
- To design, synthesize, and characterize a novel bidentate copper(II) ligand complex (SG-Cu) as a potential antimicrobial agent against MRSA.
- To evaluate the antibacterial efficacy, mechanism of action, and biocompatibility of SG-Cu.
- To assess the efficacy of SG-Cu in disrupting biofilms and promoting wound healing.
Main Methods:
- Synthesis and comprehensive characterization of SG-Cu using techniques such as ESI-MS, elemental analysis, XPS, and EPR.
- Assessment of antibacterial activity via growth inhibition, membrane perturbation, ROS generation, and electron microscopy.
- Evaluation of biocompatibility using mammalian cell lines (HEK-293, WI-38, NIH/3T3).
- Biofilm disruption assays and in vivo studies using murine wound models with SG-Cu incorporated into a hydrogel.
Main Results:
- SG-Cu was successfully synthesized and characterized, demonstrating robust biocompatibility with mammalian cells.
- The complex exhibited significant antibacterial efficacy against MRSA, disrupting bacterial membranes and inducing ROS.
- SG-Cu effectively inhibited biofilm formation and eradicated existing biofilms in vitro and in urinary catheters.
- In vivo studies showed accelerated wound healing and effective disinfection with sustained release of SG-Cu from a hydrogel formulation.
Conclusions:
- SG-Cu presents a promising, biocompatible antimicrobial agent with broad-spectrum activity against MRSA.
- Its ability to disrupt biofilms and promote wound healing makes it a versatile candidate for therapeutic development.
- This study highlights the potential of tailored copper complexes in addressing the challenge of antimicrobial resistance.
