Gradients in compositions in the starchy endosperm of wheat have implications for milling and processing

A - Papers appearing in refereed journals

Tosi, P., He, J., Lovegrove, A., Gonzalez-Thuillier, I., Penson, S. and Shewry, P. R. 2018. Gradients in compositions in the starchy endosperm of wheat have implications for milling and processing. Trends In Food Science & Technology. 82, pp. 1-7.

AuthorsTosi, P., He, J., Lovegrove, A., Gonzalez-Thuillier, I., Penson, S. and Shewry, P. R.
Abstract

Background: Wheat is the major food grain consumed in temperate countries. Most wheat is consumed after milling to produce white flour, which corresponds to the endosperm storage tissue of the grain. Because the starchy endosperm accounts for about 80% of the grain dry weight, the miller aims to achieve flour yields approaching this value.

Scope and approach: Bioimaging can be combined with biochemical analysis of fractions produced by sequential pearling of whole grains to determine the distributions of components within the endosperm tissue.

Key findings and conclusions: This reveals that endosperm is not homogeneous, but exhibits gradients in composition from the outer to the inner part. These include gradients in both amount and composition. For example, the content of gluten proteins decreases but the proportion of glutenin polymers increases from the outside to the centre of the tissue. However, the content of starch increases with changes in the granule size distribution, the proportions of amylose and amylopectin, and their thermal properties. Hence these parts of the endosperm differ in the functional properties for food processing. Gradients also exist in minor components which may affect health and processing, such as dietary fibre and lipids. The gradients in grain composition are reflected in differences in the compositions of the mill streams which are combined to give white flour (which may number over 20). These differences could therefore be exploited by millers and food processors to develop flours with compositions and properties for specific end uses.

KeywordsWheat; Grain; Gradients; Starch; Protein; Milling
Year of Publication2018
JournalTrends In Food Science & Technology
Journal citation82, pp. 1-7
Digital Object Identifier (DOI)doi:10.1016/j.tifs.2018.09.027
PubMed ID30532347
PubMed Central IDPMC6267945
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDesigning Future Wheat (DFW) [ISPG]
BBSRC Industry CASE Studentship: Spatial patterns of wheat grain composition in relation to processing properties
The role of lipids in determining gas bubble retention in wheat dough
DFW - Designing Future Wheat - Work package 2 (WP2) - Added value and resilience
Publisher's version
Output statusPublished
Publication dates
Online28 Sep 2018
Publication process dates
Accepted26 Sep 2018
PublisherElsevier Science London
Copyright licenseCC BY
ISSN0924-2244
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