Antimicrobial Peptide-Conjugated Graphene Oxide Membrane for Efficient Removal and Effective Killing of Multiple Drug...

Area of Science:

• Materials Science
• Biotechnology
• Environmental Science

Background:

• Multiple drug-resistant (MDR) bacterial infections pose a significant global health threat, outpacing antibiotic development.
• There is an urgent need for advanced materials capable of both separating and disinfecting drug-resistant pathogens.
• Methicillin-resistant Staphylococcus aureus (MRSA) is a prominent example of a dangerous MDR pathogen.

Purpose of the Study:

• To develop a novel three-dimensional (3D) porous graphene oxide membrane conjugated with nisin antimicrobial peptide.
• To investigate the membrane's efficacy in identifying, separating, and disinfecting MDR MRSA from water.
• To evaluate the synergistic antimicrobial effect of the nisin-graphene oxide conjugate.

Main Methods:

• Fabrication of a 3D porous graphene oxide membrane functionalized with nisin antimicrobial peptide.
• Utilizing size exclusion for MRSA capture via the porous membrane structure.
• Employing Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and fluorescence imaging for pathogen visualization.
• Conducting Reverse Transcription Polymerase Chain Reaction (RT-PCR) and colony counting for quantitative analysis of MRSA removal and viability.
• Comparing the antimicrobial efficacy of nisin alone, graphene oxide membrane, and the nisin-graphene oxide conjugate.

Main Results:

• The developed membrane effectively captures MRSA based on size differences, allowing water passage.
• SEM, TEM, and fluorescence imaging confirmed successful pathogen capture by the membrane.
• RT-PCR and colony counting demonstrated nearly 100% removal and destruction of MRSA from water samples.
• The nisin-conjugated graphene oxide membrane exhibited a significantly enhanced synergistic effect in destroying MRSA compared to nisin or graphene oxide alone.

Conclusions:

• A nisin-conjugated 3D porous graphene oxide membrane offers a promising solution for water disinfection.
• The membrane achieves high efficiency in separating and eradicating MDR MRSA through a multimodal synergistic mechanism.
• This innovative material addresses the critical need for effective strategies against antibiotic-resistant bacterial infections.