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Tailoring the structure-function relationship in wheat gluten

processing, genotype and environment effects in bio-based materials

Rasheed, Faiza (2015). Tailoring the structure-function relationship in wheat gluten. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2015:13
ISBN 978-91-576-8224-6
eISBN 978-91-576-8225-3
[Doctoral thesis]

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Abstract

Gluten proteins ranging in size from 30 000 to several million daltons form one of the largest and most complex polymers in nature. The giant molecular nature and intricate network of the over 100 types of proteins in gluten make structural studies rather challenging. This thesis examines the molecular crosslinking and structural properties of variously sourced gluten and its gliadin and glutenin protein fractions, both as unprocessed proteins and in films and foams.

Protein modification through chemical additives, separation procedure and genotype (G) and environmental (E) interactions had an impact on protein polymerization, nano-structure morphology, secondary structures and the mechanical properties of films. The extent of denaturation in the starting material for film formation was of relevance for the development of specific nano-scale morphology and improved mechanical properties of films. When molded into films, non-aggregated starting material such as gliadin with additives and mildly separated gluten indicated both hydrogen- and disulfide-bonded protein network, with some non-reducible covalent crosslinks. These films also showed bi-structural morphology at nano scale. The gliadin films revealed hexagonal structures and additional not previously observed structural units. The films from mildly separated gluten also showed hexagonal and lamellar structural morphology. The films from glutenin and industrially sourced gluten proteins showed a high content of non-reducible covalent crosslinks and unorganized morphology at nano scale. The G and E interactions were associated with strong and weak gluten, resulting in films with various structural and mechanical properties. The mechanical properties of films were found to be influenced by protein structure development. Structural attributes such as relatively high number of disulfide crosslinks compared with non-reducible crosslinks, high β-sheet content and specific nano-scale morphology also led to high mechanical performance of films.

Authors/Creators:Rasheed, Faiza
Title:Tailoring the structure-function relationship in wheat gluten
Subtitle:processing, genotype and environment effects in bio-based materials
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2015
Depositing date:2015
Volume:2015:13
Number of Pages:63
Papers/manuscripts:
NumberReferences
IJohansson, E., Malik, A.H., Hussain, A., Rasheed, F., Newson, W.R., Plivelic, T.S., Hedenqvist, M.S., Gällstedt, M. and Kuktaite. R. 2013. Wheat gluten polymer structures: The impact of genotype, environment, and processing on their functionality in various applications. Cereal Chemistry 90: 367-376.
IIRasheed, F., Newson, W.R., Plivelic, T.S., Kuktaite, R., Hedenqvist, M.S., Gällstedt, M. and Johansson, E. 2014. Structural architecture and solubility of native and modified gliadin and glutenin proteins: non-crystalline molecular and atomic organizations. RSC Advances 4: 2051-2060.
IIIBlomfeldt, T.O.J., Kuktaite, R., Plivelic, T.S., Rasheed, F., Johansson, E. and Hedenqvist, M.S. 2012. Novel freeze-dried foams from glutenin- and gliadin-rich fractions. RSC Advances 2: 6617-6627.
IVRasheed, F., Newson, W.R., Plivelic, T.S., Kuktaite, R., Hedenqvist, M.S., Gällstedt, M. and Johansson, E. 2014. Wheat protein structure: Nano-scale refinements to modulate the functionality upon chemical modification. Submitted.
VRasheed, F., Hedenqvist, M.S., Kuktaite, R., Plivelic, T.S., Gällstedt, M. and Johansson, E. Mild gluten separation – a non-destructive approach to fine tune the structure and mechanical behavior of wheat gluten films. Submitted.
VIRasheed, F., Kuktaite, R., Hedenqvist, M.S., Plivelic, T.S., Gällstedt, M. and Johansson, E. Can we tune wheat gluten structure and functionality in bio-based films via genetic and environmental interactions? Manuscript.
Place of Publication:Alnarp
Publisher:Department of Plant Breeding, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8224-6
ISBN for electronic version:978-91-576-8225-3
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:Q Food science > Q60 Processing of non-food or non-feed agricultural products
X Agricola extesions > X30 Life sciences
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Biochemistry and Molecular Biology
Agrovoc terms:gluten, wheats, proteins, gliadin, glutenins, morphology, polymerization, polymers, chemicophysical properties
Keywords:Gluten, Protein structure, Nano-scale morphology, Polymerization, Mechanical properties, Gliadin
URN:NBN:urn:nbn:se:slu:epsilon-e-2351
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2351
ID Code:11836
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Breeding (from 130101)
Deposited By: Ms Faiza Rasheed
Deposited On:02 Feb 2015 13:07
Metadata Last Modified:20 Feb 2015 21:09

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