Characterisation of soluble and insoluble cell wall fractions from rye, wheat and hull-less barley endosperm flours

Comino, Penny, Collins, Helen, Lahnstein, Jelle, Beahan, Cherie and Gidley, Michael J. (2014) Characterisation of soluble and insoluble cell wall fractions from rye, wheat and hull-less barley endosperm flours. Food Hydrocolloids, 41 219-226. doi:10.1016/j.foodhyd.2014.04.005

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Author Comino, Penny
Collins, Helen
Lahnstein, Jelle
Beahan, Cherie
Gidley, Michael J.
Title Characterisation of soluble and insoluble cell wall fractions from rye, wheat and hull-less barley endosperm flours
Journal name Food Hydrocolloids   Check publisher's open access policy
ISSN 0268-005X
1873-7137
Publication date 2014-12-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.foodhyd.2014.04.005
Open Access Status File (Author Post-print)
Volume 41
Start page 219
End page 226
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract Within cereal endosperm flours, arabinoxylan and β-glucan molecules exist in either a soluble or an insoluble form. From a nutritional functionality viewpoint, soluble and insoluble forms offer different potential health advantages, so it is important to define both the features controlling solubilisation and the properties of each of the soluble and insoluble fractions. Factors known to affect the stability of arabinoxylan (AX) and β-glucan (BG) solutions include AX branching extent and type, and the ratio of cellotriose to cellotetraose units (DP3/DP4) in BG. Through studying the solubilisation of AX and BG from wheat, rye, and hull less barley endosperm under conditions that avoid the use of alkali or ethanol during the solubilisation process, we report (a) similar A/X ratios and fine structures for extracted soluble arabinoxylan and the corresponding insoluble AX within the cell walls for rye and wheat endosperm flours, (b) comparable DP3/DP4 ratios for soluble β-glucan, flour and insoluble β-glucan within the endosperm cell wall of hull less barley, and (c) evidence for enrichment of β-glucan at the exterior of residual insoluble cell walls. Therefore, the factors determining solubilisation of AX and BG from endosperm cell walls are different to those that determine the stability of aqueous solutions of the same polymers, and β-glucan may show limited solubilisation by being trapped within restraining cross-linked arabinoxylans in the cell wall.
Keyword Arabinoxylan
β-Glucan
Phenolic acid
Cross-linking
Soluble dietary fibre
Endosperm cell wall
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Centre for Nutrition and Food Sciences Publications
 
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