Linseed pectin: Gelling properties and performance as an encapsulation matrix for shark liver oil

E. I. Díaz-Rojas, R. Pacheco-Aguilar, J. Lizardi, W. Argüelles-Monal, M. A. Valdez, M. Rinaudo, F. M. Goycoolea*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Fully de-esterified Na-pectate with excellent gelling properties was isolated from linseed (Linum usitatissimum) using an alkaline extraction procedure aided with a sequestering agent. The gelling behavior of this material was studied as a function of amount of Ca2+ added and temperature by dynamic oscillatory rheology. Calcium cross-linking adjusted at varying stoichiometric ratios, (R=2[Ca2+]/[COO-]), resulted in unequivocal gel network formation with mechanical spectra characteristic of permanent gel structure. Crude shark liver oil (SLO) was encapsulated into a composite matrix comprising linseed Na-pectate, alginate and chitosan. To this end, SLO was loaded into a linseed pectin-alginate solution at 2% (w/v), and gel beads were formed by dropwise addition into a CaCl2 bath and further coated by chitosan. Three different formulations were evaluated by varying the ratio of pectin to alginate (in % of the total equivalent concentration), while keeping constant the total polymer concentration at ∼4% (w/w). As the proportion of linseed pectin in the formulae increased, the gel beads lost mechanical strength, sphericity and swelled more rapidly in water by a transport mechanism controlled only by diffusion of the solvent. Loading efficiency was greater in the capsules in which pectin contributed to 28% of the negatively charged polymer species (P28), which retained 73% of SLO, while capsules of pure alginate (P0) and those with a higher amount of pectin (P71) retained 65 and 67% of SLO, respectively. The observed differences between the three types of capsules were a direct consequence of the strength of linseed pectin gels, weaker than those of alginate.

Original languageEnglish
Pages (from-to)293-304
Number of pages12
JournalFood Hydrocolloids
Volume18
Issue number2
DOIs
StatePublished - Mar 2004

Bibliographical note

Funding Information:
We are grateful to SIMAC for a research grant (Project ST-432-98). A scholarship from CONACYT to E. Dı́az is gratefully acknowledged. Financial support from CONACYT for the stay of W.A.M. (Cátedra Patrimonial No.980030) and Prof. M. Rinaudo (Program Mexico-France 1999, CONACYT-CNRS) are also thanked.

Keywords

  • Alginate
  • Pectin
  • Shark liver oil

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