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Depolymerization of chitosan-metal complexes via a solution plasma technique.

Orathai Pornsunthorntawee1, Chaiyapruk Katepetch1, Chutima Vanichvattanadecha1

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Solution plasma treatment depolymerized chitosan-metal complexes. Copper (Cu2+) and iron (Fe3+) ions significantly accelerated chitosan depolymerization, yielding low-molecular-weight chitosan fractions.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Polymer Chemistry

Background:

  • Chitosan, a natural polysaccharide, has diverse applications but its high molecular weight can limit its utility.
  • Depolymerization is crucial for tailoring chitosan's properties for specific applications.
  • Solution plasma processing offers a novel, non-thermal method for chemical modification.

Purpose of the Study:

  • To investigate the effect of different metal ions on the solution plasma depolymerization of chitosan.
  • To evaluate the influence of metal-chitosan complexation on depolymerization kinetics and product yield.
  • To characterize the depolymerized chitosan fractions.

Main Methods:

  • Chitosan solutions were prepared and complexed with four different metal ions (Ag+, Zn2+, Cu2+, Fe3+) at a 1:8 molar ratio.
  • Solution plasma treatment was applied under acidic conditions to depolymerize the chitosan-metal complexes.
  • Depolymerization rates were monitored, and products were separated into water-insoluble and water-soluble fractions.
  • Yields of low-molecular-weight chitosan were determined.

Main Results:

  • The depolymerization rate of chitosan was significantly influenced by the type of complexed metal ion.
  • Chitosan complexation with Cu2+ and Fe3+ ions markedly enhanced the depolymerization rate under solution plasma treatment.
  • Chitosan-Ag+ and chitosan-Zn2+ complexes showed no significant change in depolymerization rate compared to native chitosan.
  • A water-soluble fraction, containing low-molecular-weight chitosan, was obtained with a yield of less than 57% for the Fe3+ complex after 180 min of plasma treatment.

Conclusions:

  • Metal ion complexation plays a critical role in modulating the solution plasma depolymerization of chitosan.
  • Fe3+ and Cu2+ are effective in promoting chitosan depolymerization, leading to the formation of valuable low-molecular-weight fractions.
  • Solution plasma technology, combined with strategic metal ion complexation, presents a viable method for producing functional chitosan derivatives.