Transgenic sorghum with suppressed synthesis of kafirin subclasses : effects on flour and dough rheological characteristics

dc.contributor.authorElhassan, Mohammed S.M.
dc.contributor.authorEmmambux, Mohammad Naushad
dc.contributor.authorTaylor, J.R.N. (John Reginald Nuttall)
dc.contributor.emailjohn.taylor@up.ac.zaen_ZA
dc.date.accessioned2017-08-07T08:17:08Z
dc.date.issued2017-05
dc.description.abstractArising from work showing that conventionally bred high protein digestibility sorghum types have improved flour and dough functionality, the flour and dough properties of transgenic biofortified sorghum lines with increased protein digestibility and high lysine content (TG-HD) resulting from suppressed synthesis of several kafirin subclasses, especially the cysteine-rich γ-kafirin, were studied. TG-HD sorghums had higher flour water solubility at 30 °C (p < 0.05) and much higher paste viscosity (41% higher) than their null controls (NC). TG-HD doughs were twice as strong as their NC and dynamic rheological analysis indicated that the TG doughs were somewhat more elastic up to 90 °C. CLSM of doughs and pastes indicated that TG-HD had a less compact endosperm protein matrix surround the starch compared to their NC. The improved flour and dough functional properties of the TG-HD sorghums seem to be caused by reduced endosperm compactness resulting from suppression of synthesis of several kafirin subclasses which modifies protein body and protein matrix structure, and to improved protein-starch interaction through hydrogen bonding specifically caused by reduction in the level of the hydrophobic γ-kafirin. The improved flour functionality of these transgenic biofortified sorghums can increase their commercial utility by complementing their improved nutritional quality.en_ZA
dc.description.departmentFood Scienceen_ZA
dc.description.embargo2018-05-30
dc.description.librarianhj2017en_ZA
dc.description.sponsorshipThe Howard G. Buffett Foundation through the Norman E. Borlaug Institute for International Agriculture of Texas A&M University. The Bill and Melinda Gates Grand Challenges 9, Africa Biofortified Sorghum Project through a sub-grant from the Africa Harvest Biotechnology Foundation International. The University of Pretoria for a Research Support Bursary for MSM Elhassan.en_ZA
dc.description.urihttp://www.elsevier.com/locate/jcsen_ZA
dc.identifier.citationElhassan, M.S.M., Emmambux, M.N. & Taylor, J.R.N. 2017, 'Transgenic sorghum with suppressed synthesis of kafirin subclasses : effects on flour and dough rheological characteristics', Journal of Cereal Science, vol. 75, pp. 69-76.en_ZA
dc.identifier.issn1095-9963 (online)
dc.identifier.issn0733-5210 (print)
dc.identifier.other10.1016/j.jcs.2017.03.020
dc.identifier.urihttp://hdl.handle.net/2263/61596
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2017 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Journal of Cereal Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Journal of Cereal Science, vol. 75, pp. 69-76, 2017. doi : 10.1016/j.jcs.2017.03.020.en_ZA
dc.subjectDough rheological propertiesen_ZA
dc.subjectKafirinen_ZA
dc.subjectSorghumen_ZA
dc.subjectTransgenic sorghum with high protein digestibility (TG-HD)en_ZA
dc.titleTransgenic sorghum with suppressed synthesis of kafirin subclasses : effects on flour and dough rheological characteristicsen_ZA
dc.typePostprint Articleen_ZA

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Elhassan_Transgenic_2017.pdf
Size:
1.35 MB
Format:
Adobe Portable Document Format
Description:
Postprint Article

License bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
license.txt
Size:
1.75 KB
Format:
Item-specific license agreed upon to submission
Description: