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Related Experiment Video

Updated: Jun 24, 2026

Quantifying Mixing using Magnetic Resonance Imaging
07:33

Quantifying Mixing using Magnetic Resonance Imaging

Published on: January 25, 2012

Thermal and viscoelastic properties of kappa/iota-hybrid carrageenan gels obtained from the Portuguese seaweed

L Hilliou1, F D S Larontonda, A M Sereno

  • 1REQUIMTE-CEQUP, Departamento de Engenharia Química, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal. hilliou@fe.up.pt

Journal of Agricultural and Food Chemistry
|September 28, 2006
PubMed
Summary
This summary is machine-generated.

This study explores Portuguese seaweed Mastocarpus stellatus as a natural food thickening and gelling agent. Researchers optimized extraction to create hybrid carrageenans with tunable properties and good gel elasticity without water syneresis.

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Area of Science:

  • Food Science and Technology
  • Marine Biotechnology
  • Polymer Chemistry

Background:

  • Investigating underutilized marine resources for novel food ingredients.
  • Carrageenans are widely used food hydrocolloids, but sourcing and properties can vary.
  • Mastocarpus stellatus, a Portuguese seaweed, shows potential for producing valuable carrageenans.

Purpose of the Study:

  • To evaluate Mastocarpus stellatus as a source of natural thickening and gelling agents for food.
  • To systematically optimize extraction parameters for producing kappa/iota-hybrid carrageenans.
  • To characterize the chemical and mechanical properties of the extracted carrageenans and their gels.

Main Methods:

  • Alkaline pretreatment of seaweed followed by systematic variation of extraction parameters (pH, temperature, duration).
  • Characterization of extracted biopolymers using Fourier Transform Infrared (FTIR) spectroscopy.
  • Analysis of gel properties (mechanical spectra, setting/melting temperatures, elasticity, water syneresis) using small amplitude oscillatory shear experiments.

Main Results:

  • Successfully produced kappa/iota-hybrid carrageenans with a range of chemical properties.
  • Developed gels with elastic storage moduli from 250 to 2750 Pa, exhibiting no water syneresis.
  • Established correlations between gel mechanical properties (elasticity, thermal behavior) and polysaccharide chemical parameters (sulfate content, molecular weight, iota-carrageenan monomer content).

Conclusions:

  • Mastocarpus stellatus is a viable source for producing functional hybrid carrageenans for food applications.
  • Optimized extraction conditions allow for tailoring carrageenan properties for specific gel functionalities.
  • The study demonstrates a strong link between the chemical structure of carrageenans and the performance of their gels.