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[Preparation and characterization of chitosan membrane for solid phase microextraction technique].

Hong-li Yang1, Yi-ru Wang, Zhi-xia Zhuang

  • 1Department of Chemistry, The Key Laboratory of Analytical Science of Ministry of Education, Xiamen University, Xiamen 361005, China.

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|July 11, 2006
PubMed
Summary

Chitosan membranes efficiently extract chlorophyll using solid-phase microextraction. This natural polymer method offers a robust and rapid analysis for chlorophyll determination.

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Area of Science:

  • Analytical Chemistry
  • Polymer Science
  • Biochemistry

Background:

  • Chitosan, a natural polymer, possesses abundant amido and hydroxyl groups.
  • Its robust nature and high partition coefficient for chlorophyll make it suitable for extraction applications.

Purpose of the Study:

  • To investigate the efficacy of chitosan membranes for solid-phase microextraction of chlorophyll.
  • To determine the optimal conditions for chlorophyll extraction and desorption using chitosan.

Main Methods:

  • Solid-phase microextraction (SPME) utilizing chitosan membranes.
  • Equilibrium time determination for extraction.
  • Desorption studies using sodium hydroxide (NaOH) with ultrasonic treatment.
  • Infrared (IR) and X-ray Diffraction (XRD) analysis to understand the mechanism.

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Main Results:

  • Chitosan membranes demonstrated a high partition coefficient (9,090) for chlorophyll, facilitating efficient extraction.
  • Complete equilibrium for chlorophyll extraction was achieved in 80 minutes.
  • Complete desorption of chlorophyll was achieved in 30 minutes using 5% NaOH with ultrasonic assistance.
  • IR and XRD analyses revealed weakened hydrogen bonds in chitosan, with amido and hydroxyl groups playing a key role in chlorophyll extraction.

Conclusions:

  • Chitosan membranes are effective for the solid-phase microextraction and analysis of chlorophyll.
  • The extraction mechanism involves the interaction of chlorophyll with the amido and hydroxyl groups of chitosan, facilitated by the weakening of hydrogen bonds.