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Gum arabic-chitosan complex coacervation.

Hugo Espinosa-Andrews1, Juan G Báez-González, Francisco Cruz-Sosa

  • 1DIPH and DBT, Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, Mexico City 09340, Mexico.

Biomacromolecules
|March 23, 2007
PubMed
Summary
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Gum Arabic (GA) and Chitosan (Ch) electrostatic complexes form best at a GA/Ch ratio of 5. Optimal coacervate yield occurs between pH 3.5-5.0, with decreasing yield at higher ionic strengths.

Area of Science:

  • Biopolymer science
  • Food chemistry
  • Materials science

Background:

  • Gum Arabic (GA) and Chitosan (Ch) are oppositely charged polysaccharides.
  • Understanding their electrostatic complexation is crucial for various applications.
  • Factors influencing complex formation require detailed investigation.

Purpose of the Study:

  • To investigate the formation of GA-Ch electrostatic complexes.
  • To determine the impact of biopolymer ratio, concentration, pH, and ionic strength on complexation.
  • To identify optimal conditions for coacervate yield.

Main Methods:

  • Turbidimetric measurements to assess complex formation.
  • Electrophoretic mobility studies to analyze particle charge.
  • Quantification of mass in the precipitated phase for yield determination.

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Main Results:

  • Optimum coacervate yield achieved at a Gum Arabic to Chitosan ratio (RGA/Ch) of 5.
  • High coacervate yields observed within a pH range of 3.5 to 5.0.
  • Yield decreased below pH 3.5 (due to GA ionization) and above pH 5 (due to Chitosan solubility); increased ionic strength reduced yield.

Conclusions:

  • The GA/Ch ratio is a key factor in electrostatic complex formation.
  • pH significantly influences coacervate yield by affecting biopolymer ionization and solubility.
  • Ionic strength reduction of complexation highlights the importance of electrostatic interactions.