Araiza-Calahorra, A and Sarkar, A orcid.org/0000-0003-1742-2122 (2019) Designing biopolymer-coated Pickering emulsions to modulate in vitro gastric digestion: A static model study. Food and Function, 10 (9). pp. 5498-5509. ISSN 2042-6496
Abstract
The aim of this study was to restrict the degree of gastric destabilization of Pickering emulsions by using electrostatic deposition of a biopolymeric layer at the proteinaceous particle-laden oil-water interface. Pickering emulsions (20 wt% oil) were prepared using whey protein nanogel particles (WPN, Dh ~ 91.5 nm) (1 wt%) and the emulsions were coated by a layer of anionic polysaccharide, dextran sulphate (DxS) of molecular weight (MW) of 40 or 500 kDa, respectively. The hypothesis was that DxS coating on the protein nanogel particle-laden interface would act as a steric barrier against interfacial proteolysis of WPN by pepsin. During static in vitro gastric digestion, the droplet size, ζ-potential, microstructure (confocal microscopy with fluorescently labelled dextran) and protein hydrolysis were monitored. The ζ-potential measurements confirmed that 0.2 wt% DxS was sufficient to coat the WPN-stabilized emulsion droplets with clear charge reversal from +35.9 mV to -28.8 (40 kDa) and -46.2 mV (500 kDa). Protein hydrolysis results showed a significantly lower level of free amino groups upon addition of 0.2 wt% DxS of either 40 or 500 kDa MW to the WPN (p ≤ 0.05). Emulsions coated with DxS-500 kDa presented stable droplets with lower degree of pepsin hydrolysis of the adsorbed layer as compared to those coated with DxS-40 kDa or uncoated protein nanogel-stabilized interface after 120 min of digestion, highlighting the importance of charge density and molecular weight of the polymer coating. Insights from this study could enable designing gastric-stable emulsions for encapsulation of lipophilic compounds that require delivery to the intestine.
Metadata
Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019, The Royal Society of Chemistry. This is an author produced version of an article published in Food and Function. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Food Science and Nutrition (Leeds) > FSN Colloids and Food Processing (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 12 Aug 2019 08:45 |
Last Modified: | 09 Aug 2020 00:38 |
Status: | Published |
Publisher: | Royal Society of Chemistry |
Identification Number: | https://doi.org/10.1039/C9FO01080G |