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Self-structuring foods based on acid-sensitive low and high acyl mixed gellan systems to impact on satiety
This study investigated the in vitro acid-induced gelation of mixed systems of two biopolymers; low acyl and high acyl gellan gum. Rheological and texture analysis showed that these mixed gels displayed textures that lay between the material properties exhibited for the low and high acyl variants. D...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4025606/ https://www.ncbi.nlm.nih.gov/pubmed/24882914 http://dx.doi.org/10.1016/j.foodhyd.2013.07.014 |
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author | Bradbeer, Jennifer F. Hancocks, Robin Spyropoulos, Fotios Norton, Ian T. |
author_facet | Bradbeer, Jennifer F. Hancocks, Robin Spyropoulos, Fotios Norton, Ian T. |
author_sort | Bradbeer, Jennifer F. |
collection | PubMed |
description | This study investigated the in vitro acid-induced gelation of mixed systems of two biopolymers; low acyl and high acyl gellan gum. Rheological and texture analysis showed that these mixed gels displayed textures that lay between the material properties exhibited for the low and high acyl variants. DSC analysis showed that mixtures of the low acyl and high acyl forms exhibit two separate conformational transitions at temperatures coincident with each of the individual biopolymers. Various metabolically relevant pH environments and hydrocolloid concentrations were investigated. These resulted in very different acid gelled structures, which were characterised by texture analysis. The structures of the acid gels were shown to depend upon the pH, hydrocolloid concentration and proportion of each biopolymer used during their production. A selection of these mixed gellan structures were assessed post-production in terms of their response to prolonged exposure to an acidic (pH 1), stomach-like, environment. This resulted in a significant increase in the gel strength, regardless of the biopolymer proportions. The high acyl gellan was less acid-sensitive, and subsequently no evidence of acid gelation was observed with high acyl gellan at a proportion greater than 60% of the total biopolymer. The findings presented here demonstrate that structuring as well as de-structuring of mixed gellan acid gels can be controlled in acidic environments similar to those that are present in the stomach after food consumption. |
format | Online Article Text |
id | pubmed-4025606 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-40256062014-05-30 Self-structuring foods based on acid-sensitive low and high acyl mixed gellan systems to impact on satiety Bradbeer, Jennifer F. Hancocks, Robin Spyropoulos, Fotios Norton, Ian T. Food Hydrocoll Article This study investigated the in vitro acid-induced gelation of mixed systems of two biopolymers; low acyl and high acyl gellan gum. Rheological and texture analysis showed that these mixed gels displayed textures that lay between the material properties exhibited for the low and high acyl variants. DSC analysis showed that mixtures of the low acyl and high acyl forms exhibit two separate conformational transitions at temperatures coincident with each of the individual biopolymers. Various metabolically relevant pH environments and hydrocolloid concentrations were investigated. These resulted in very different acid gelled structures, which were characterised by texture analysis. The structures of the acid gels were shown to depend upon the pH, hydrocolloid concentration and proportion of each biopolymer used during their production. A selection of these mixed gellan structures were assessed post-production in terms of their response to prolonged exposure to an acidic (pH 1), stomach-like, environment. This resulted in a significant increase in the gel strength, regardless of the biopolymer proportions. The high acyl gellan was less acid-sensitive, and subsequently no evidence of acid gelation was observed with high acyl gellan at a proportion greater than 60% of the total biopolymer. The findings presented here demonstrate that structuring as well as de-structuring of mixed gellan acid gels can be controlled in acidic environments similar to those that are present in the stomach after food consumption. Elsevier 2014-03 /pmc/articles/PMC4025606/ /pubmed/24882914 http://dx.doi.org/10.1016/j.foodhyd.2013.07.014 Text en © 2013 The Authors http://creativecommons.org/licenses/by/3.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). |
spellingShingle | Article Bradbeer, Jennifer F. Hancocks, Robin Spyropoulos, Fotios Norton, Ian T. Self-structuring foods based on acid-sensitive low and high acyl mixed gellan systems to impact on satiety |
title | Self-structuring foods based on acid-sensitive low and high acyl mixed gellan systems to impact on satiety |
title_full | Self-structuring foods based on acid-sensitive low and high acyl mixed gellan systems to impact on satiety |
title_fullStr | Self-structuring foods based on acid-sensitive low and high acyl mixed gellan systems to impact on satiety |
title_full_unstemmed | Self-structuring foods based on acid-sensitive low and high acyl mixed gellan systems to impact on satiety |
title_short | Self-structuring foods based on acid-sensitive low and high acyl mixed gellan systems to impact on satiety |
title_sort | self-structuring foods based on acid-sensitive low and high acyl mixed gellan systems to impact on satiety |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4025606/ https://www.ncbi.nlm.nih.gov/pubmed/24882914 http://dx.doi.org/10.1016/j.foodhyd.2013.07.014 |
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