Nanostructural changes in Polysaccharide-Casein Gel-Like structures upon in vitro gastrointestinal digestion
| Autor: | Cynthia Fontes-Candia, Laura Díaz-Piñero, Juan Carlos Martínez, Laura G. Gómez-Mascaraque, Amparo López-Rubio, Marta Martínez-Sanz |
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| Přispěvatelé: | Agencia Estatal de Investigación (España), European Commission |
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
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| Popis: | This work reports on the nanostructural changes taking place during the in vitro gastrointestinal digestion of polysaccharide-casein gel-like structures through the use of small angle X-ray scattering (SAXS). The results indicated that during the gastric phase, the hydrolysis of casein led to a swelling of the micellar structure, yielding peptide clusters. The presence of sulphated polysaccharides such as agar and κ-carrageenan was seen to limit the hydrolysis of casein during the gastric phase, hence decreasing the size of the formed clusters. After the intestinal phase, the produced peptidic fragments appeared to interact with the bile salts present in the digestion medium, yielding a mixture of bile salt lamellae/micelles and vesicular structures. However, in the presence of polysaccharides, which can interact with bile salts, the formation of vesicular structures was limited. Interestingly, the inclusion of casein within hybrid gel-like structures led to the formation of strong polysaccharide-protein interactions, especially in the case of κ-carrageenan. As a result, in some of the formulations, polysaccharide-peptide complexes were released towards the liquid medium, which formed larger vesicular structures. This was related to the greater protective effect of these particular gel-like structures. Furthermore, κ-carrageenan hindered the formation of bile salt lamellae/micelles. These results are of high relevance to understand the intestinal transport mechanism of the digestion products from protein-based ingredients and will allow a rational design of novel products with optimum nutritional and functional properties. This work was financially supported by the projects RTI2018-094408-J-I00 and RTI-2018-094268-B-C22, funded by MCIN/AEI/10.13039/501100011033 and by “ERDF A way of making Europe”. Synchrotron experiments were performed at NCD beamline at ALBA Synchrotron with the collaboration of ALBA staff (proposals 2021055177 and 2022025569). Laura Díaz-Piñero is recipient of a pre-doctoral JAE grant from CSIC (JAEINT_21 _03398_). |
| Databáze: | OpenAIRE |
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