Probing the Double-Layered Cotyledon Cell Structure of Navy Beans: Barrier Effect of the Protein Matrix on In Vitro Starch Digestion

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dc.citation.issue1
dc.citation.volume15
dc.contributor.authorDo DT
dc.contributor.authorSingh J
dc.contributor.authorJohnson S
dc.contributor.authorSingh H
dc.contributor.editorBordoni A
dc.coverage.spatialSwitzerland
dc.date.accessioned2023-10-30T00:34:01Z
dc.date.accessioned2023-11-03T05:06:20Z
dc.date.available2022-12-26
dc.date.available2023-10-30T00:34:01Z
dc.date.available2023-11-03T05:06:20Z
dc.date.issued2023-01
dc.description.abstractThe microstructure of legumes plays a crucial role in regulating starch digestion and postprandial glycemic responses. Starch granules are double encapsulated within the outer cell wall and the inner protein matrix of legume cotyledon cells. Despite progress in understanding the role of cell walls in delaying starch digestion, the role of the protein matrix has received little research attention. The aim of this study was to evaluate if the protein matrix and cell wall may present combined physical barriers retarding enzyme hydrolysis of intracellular starch. Intact cotyledon cells were isolated from navy beans and used to assess the barrier effect of the protein matrix on the digestion of starch under conditions simulating the upper gastrointestinal tract. The cells were pretreated with pepsin at 37 °C and pH 2.0 for 1, 4, or 24 h and without pepsin for 24 h (control) to facilitate removal of the intracellular protein matrix prior to cooking and simulated in vitro digestion. A longer pretreatment time resulted in a lower protein content of the cells and a higher initial rate and extent of starch hydrolysis. We suggest that in addition to the primary cell wall barrier, the protein matrix provides a secondary barrier restricting the accessibility of α-amylase to starch. This study provides a new fundamental understanding of the relationship between the structural organization of legume cotyledon cells and starch digestion that could inform the design of novel low glycemic index foods.
dc.description.confidentialfalse
dc.edition.editionJanuary 2023
dc.format.pagination105-
dc.identifier.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/36615763
dc.identifier.citationDo DT, Singh J, Johnson S, Singh H. (2022). Probing the Double-Layered Cotyledon Cell Structure of Navy Beans: Barrier Effect of the Protein Matrix on In Vitro Starch Digestion.. Nutrients. 15. 1. (pp. 105-).
dc.identifier.doi10.3390/nu15010105
dc.identifier.eissn2072-6643
dc.identifier.elements-typejournal-article
dc.identifier.issn2072-6643
dc.identifier.number105
dc.identifier.piinu15010105
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/69045
dc.languageeng
dc.publisherMDPI (Basel, Switzerland)
dc.publisher.urihttps://www.mdpi.com/2072-6643/15/1/105
dc.relation.isPartOfNutrients
dc.rights(c) 2022 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectcotyledon cells
dc.subjectin vitro starch digestion
dc.subjectlegume structure
dc.subjectlow glycaemic index
dc.subjectnavy beans
dc.subjectprotein matrix
dc.subjectPepsin A
dc.subjectStarch
dc.subjectCotyledon
dc.subjectFabaceae
dc.subjectCooking
dc.subjectDigestion
dc.titleProbing the Double-Layered Cotyledon Cell Structure of Navy Beans: Barrier Effect of the Protein Matrix on In Vitro Starch Digestion
dc.typeJournal article
pubs.elements-id458781
pubs.organisational-groupOther
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