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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
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Covalent Pectin/Arabinoxylan Hydrogels: Rheological and Microstructural Characterization.

Claudia Lara-Espinoza1, Agustín Rascón-Chu1, Valérie Micard2

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This study developed a new ferulated pectin (FP) and ferulated arabinoxylan (AXF) hydrogel. The material exhibits a robust structure and unique microstructural properties, showing promise for biopolymer applications.

Keywords:
ferulic acidmicrostructural characteristicsmixed hydrogeloxidative couplingrheological properties

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Area of Science:

  • Food Science
  • Materials Science
  • Biochemistry

Background:

  • Pectin and arabinoxylan are polysaccharides with potential for hydrogel formation.
  • Feruloylation enhances the gelling properties of polysaccharides through oxidative coupling.
  • Developing novel biopolymeric materials with tunable properties is of significant interest.

Purpose of the Study:

  • To evaluate the gelation process of ferulated pectin (FP) and ferulated arabinoxylan (AXF) in a mixed hydrogel.
  • To characterize the microstructural and rheological properties of the novel hydrogel.
  • To determine the ferulic acid content and distribution within the hydrogel matrix.

Main Methods:

  • Oxidative coupling using laccase as a crosslinking agent for FP and AXF.
  • Dynamic oscillatory rheology to measure gel strength (storage modulus).
  • Scanning electron microscopy (SEM) for microstructural analysis.
  • High-performance liquid chromatography (HPLC) for ferulic acid quantification.

Main Results:

  • The mixed hydrogel achieved a maximum storage modulus of 768 Pa after 60 minutes of gelation.
  • SEM revealed an imperfect honeycomb microstructure in the hydrogels.
  • The hydrogel contained 3.73 mg/g of ferulic acid, with the 8-5' ferulic acid dimer being the most abundant, along with detected trimers.

Conclusions:

  • A novel covalent biopolymeric hydrogel was successfully developed using ferulated pectin and ferulated arabinoxylan.
  • The hydrogel exhibits promising rheological and microstructural characteristics suitable for advanced material applications.
  • This research provides insights into the distribution of ferulic acid dimers and their contribution to hydrogel properties.