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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

436
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
436

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Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues
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Comparative efficiency of different polyol-based deep eutectic solvents for chitin extraction from lobster shells.

Honglin Zhu1, Sunni Chen1, Tiangang Yang2

  • 1Nanotechnology and Biodelivery Laboratory, Department of Nutritional Sciences, University of Connecticut, Storrs, CT 06269-4017, United States.

International Journal of Biological Macromolecules
|August 3, 2024
PubMed
Summary

Deep eutectic solvents (DES) effectively extract chitin from lobster shells. Choline chloride-lactic acid/glycerol (CCLaGly) showed superior performance, yielding pure chitin comparable to chemical methods.

Keywords:
ChitinDeep eutectic solventLobster shellPhysicochemical propertiesPolyol

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Area of Science:

  • Biomaterials Science
  • Green Chemistry
  • Sustainable Resource Utilization

Background:

  • Chitin, a valuable biopolymer, is abundant in crustacean shells.
  • Traditional chitin extraction methods often involve harsh chemicals and generate waste.
  • Deep eutectic solvents (DES) offer a promising eco-friendly alternative for biopolymer extraction.

Purpose of the Study:

  • To compare the efficacy of various deep eutectic solvents (DES) in extracting chitin from lobster shells.
  • To investigate the influence of polyol structure on DES properties and chitin extraction efficiency.
  • To characterize the physicochemical properties of DES-extracted chitin.

Main Methods:

  • Preparation and characterization of four DESs based on choline chloride, lactic acid, and different polyols (ethylene glycol, glycerol, xylitol, sorbitol).
  • Extraction of chitin from lobster shells using the prepared DESs.
  • Purity, crystallinity, and molecular weight analysis of extracted chitin.
  • Physicochemical characterization using FTIR, XRD, TGA, and SEM.

Main Results:

  • Increased hydroxyl groups in polyols led to denser DES hydrogen bond networks but also higher viscosity, impacting extraction efficiency.
  • Choline chloride-lactic acid/glycerol (CCLaGly) demonstrated the highest extractive ability, yielding pure chitin.
  • DES-extracted chitin exhibited purity (94.76%), crystallinity (78.78%), and molecular weight (655 kDa) comparable to chemically isolated chitin.

Conclusions:

  • The choice of polyol significantly affects DES viscosity and chitin extraction performance.
  • CCLaGly is a highly effective DES for extracting pure chitin from lobster shells.
  • This study highlights a sustainable and efficient method for chitin extraction and valorization of crustacean waste.