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Related Concept Videos

Acid Halides to Carboxylic Acids: Hydrolysis01:01

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Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
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Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
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α-Chitin dissolution, N-deacetylation and valorization in deep eutectic solvents.

Filipa A Vicente1, Bojana Bradić1, Uroš Novak1

  • 1National Institute of Chemistry, Ljubljana, Slovenia.

Biopolymers
|March 13, 2020
PubMed
Summary

Deep eutectic solvents (DESs) efficiently dissolve and deacetylate chitin into chitosan. This greener method uses milder conditions, achieving 70-80% deacetylation with betaine-glycerol and choline chloride-lactic acid based DESs.

Keywords:
chitin valorizationchitosan biopolymerdeep eutectic solventhomogeneous chitin N-deacetylationsustainable process

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Area of Science:

  • Biopolymer Chemistry
  • Green Chemistry
  • Materials Science

Background:

  • Chitin's rigid structure, due to extensive hydrogen bonding, limits its solubility and deacetylation.
  • Deep eutectic solvents (DESs), formed from hydrogen bond donors and acceptors, can disrupt chitin's hydrogen bonds, enhancing its solubility.
  • Conventional chitin deacetylation requires harsh conditions (high NaOH concentration and temperature), posing environmental and biocompatibility concerns.

Purpose of the Study:

  • To investigate the efficacy of four distinct DESs in dissolving chitin.
  • To evaluate the application of the most effective DESs in the homogeneous N-deacetylation of chitin under milder conditions.
  • To establish a proof of concept for a greener approach to chitin modification.

Main Methods:

  • Four DESs (choline chloride-lactic acid, choline chloride:oxalic acid, choline chloride:urea, and betaine-glycerol) were employed for chitin dissolution.
  • The most effective DESs were used for homogeneous N-deacetylation of chitin using 30 wt% NaOH at 80°C for 18 hours.
  • Attenuated Total Reflectance Fourier-Transform Infrared Spectroscopy (ATR-FTIR) was utilized for reaction analysis.

Main Results:

  • DESs successfully dissolved chitin by disrupting its hydrogen bonding network.
  • Chitin was converted to chitosan with a 70-80% degree of deacetylation (DDA) under the optimized, milder conditions.
  • Betaine-glycerol (Bet:G) and choline chloride-lactic acid ([Ch]Cl:LA) based DESs demonstrated significant potential for greener chitin deacetylation.

Conclusions:

  • Bet:G and [Ch]Cl:LA based DESs offer a promising, environmentally friendly alternative for homogeneous chitin N-deacetylation.
  • The developed method utilizes milder reaction conditions compared to traditional approaches.
  • This study provides the first evidence for the use of these specific DESs in a sustainable chitin modification process.