Intragastric structuring of anionic polysaccharide kappa-carrageenan filled gels under physiological in vitro digestion conditions

Soukoulis, Christos; Fisk, Ian D.; Gan, Heng-Hui; Hoffmann, Lucien

Abstract

In the present work, sodium alginate (SA), low methoxyl pectin (PEC) and κ-carrageenan (κ-CAR) were evaluated for their intragastric structuring ability by means of light microscopy and dynamic oscillatory rheology. SA and PEC solutions, their Ca2+ complexed gel analogues as well as their binary blends with ionically or thermally set sheared κ-CAR gels, were subjected to in vitro orogastric conditions. SA and PEC – Ca2+ complexed sheared gels exerted the highest vulnerability to digestive fluid exposure due to the dialysis of egg-box dimer structures via proton-calcium exchange. Incorporation of SA and PEC systems to κ-CAR gels prevented the loss of mechanical strength of the gastric gels due to the ability of κ-CAR to undergo spontaneous gelation in the presence of Na+ and K+ ions. Binary blends of SA and PEC – Ca2+ complexed sheared gels with κ-CAR-Ca2+ gels exerted a significantly lower mechanical strength loss sensitivity against pH and counterion composition of the gastric fluids.

Citation

Soukoulis, C., Fisk, I. D., Gan, H., & Hoffmann, L. (in press). Intragastric structuring of anionic polysaccharide kappa-carrageenan filled gels under physiological in vitro digestion conditions. Journal of Food Engineering, 191, https://doi.org/10.1016/j.jfoodeng.2016.07.009

• Journal Article Type: Article
• Acceptance Date: Jul 22, 2016
• Online Publication Date: Jul 26, 2016
• Deposit Date: Jan 26, 2017
• Publicly Available Date: Jan 26, 2017
• Journal: Journal of Food Engineering
• Print ISSN: 0260-8774
• Electronic ISSN: 0260-8774
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 191
• DOI: https://doi.org/10.1016/j.jfoodeng.2016.07.009
• Keywords: Alginates; Pectins; Intragastric structuring; Pre-absorptive digestion conditions; Acid gelation; Ionotropic gelation
• Public URL: https://nottingham-repository.worktribe.com/output/799523
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S026087741630259X