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Related Concept Videos

Biofilms01:29

Biofilms

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Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
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Related Experiment Video

Updated: Oct 2, 2025

Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
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Enhanced Antimicrobial Cellulose/Chitosan/ZnO Biodegradable Composite Membrane.

Xiaolong Sun1,2, Longfei Yin2, Huayue Zhu2

  • 1State Key Laboratory of Material-Oriented Chemical Engineering, School of Pharmaceutical Sciences, Nanjing Tech University, No. 30 Puzhu Road, Nanjing 211816, China.

Membranes
|February 25, 2022
PubMed
Summary

This study developed biodegradable antimicrobial membranes using chitosan, sugarcane cellulose, zinc oxide (ZnO), and phenyllactic acid (PA). The composite membranes exhibit enhanced mechanical and antimicrobial properties, with PA concentration optimizing water absorption and antibacterial efficacy.

Keywords:
antimicrobial activitycomposite membranephenyllactic acid

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Area of Science:

  • Materials Science
  • Biotechnology
  • Polymer Science

Background:

  • Biodegradable antimicrobial materials are crucial for reducing plastic waste and preventing microbial contamination.
  • Chitosan and cellulose are abundant biopolymers with potential for creating sustainable materials.
  • Incorporating inorganic agents like zinc oxide (ZnO) and natural compounds like phenyllactic acid (PA) can enhance material properties.

Purpose of the Study:

  • To fabricate and characterize biodegradable antimicrobial composite membranes using chitosan, sugarcane cellulose, ZnO, and PA.
  • To investigate the effect of PA concentration on the water absorption and antimicrobial properties of the composite membranes.
  • To evaluate the integration of composite membrane components and their antimicrobial efficacy against specific pathogens.

Main Methods:

  • Fabrication of composite membranes using chitosan and sugarcane cellulose as film-forming materials.
  • Incorporation of zinc oxide (ZnO) and varying concentrations of phenyllactic acid (PA) as bacteriostatic agents.
  • Characterization using Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and X-ray Diffraction (XRD).
  • Assessment of water absorption, swelling, and antimicrobial activity against Staphylococcus aureus, Escherichia coli, Aspergillus niger, and Penicillium rubens.

Main Results:

  • SEM, FTIR, and XRD confirmed successful integration of composite membrane components.
  • ZnO addition enhanced mechanical and antimicrobial properties.
  • PA addition, particularly at high crystallinity, reduced water absorption and swelling, with 0.5% PA improving water absorption.
  • PA significantly boosted antimicrobial activity against tested bacteria and fungi.
  • Optimal antimicrobial effects were observed with 0.3% PA against S. aureus, E. coli, and A. niger, and 0.7% PA against P. rubens.

Conclusions:

  • Biodegradable antimicrobial composite membranes were successfully fabricated with tunable properties.
  • The combination of ZnO and PA offers a promising approach for developing effective antimicrobial materials.
  • PA concentration is a key factor in optimizing water absorption and specific antimicrobial efficacy against various microorganisms.