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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

Authors

Christos Soukoulis

Heng-Hui Gan

Lucien Hoffmann



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.

Journal Article Type Article
Journal Journal of Food Engineering
Print ISSN 0260-8774
Electronic ISSN 0260-8774
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 191
APA6 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
DOI https://doi.org/10.1016/j.jfoodeng.2016.07.009
Keywords Alginates; Pectins; Intragastric structuring; Pre-absorptive digestion conditions; Acid gelation; Ionotropic gelation
Publisher URL http://www.sciencedirect.com/science/article/pii/S026087741630259X
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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