Improvement in the protein quality of African sorghum foods through compositing with cowpea

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dc.contributor.advisor De Kock, Henrietta Letitia en
dc.contributor.advisor Taylor, J.R.N. (John Reginald Nuttall) en
dc.contributor.postgraduate Anyango, Joseph Ochieng
dc.date.accessioned 2013-09-07T11:09:10Z
dc.date.available 2010-08-16 en
dc.date.available 2013-09-07T11:09:10Z
dc.date.created 2010-04-21 en
dc.date.issued 2010-08-16 en
dc.date.submitted 2010-08-16 en
dc.description Dissertation (MSc)--University of Pretoria, 2010. en
dc.description.abstract Lysine deficiency is a major nutritional problem faced by poor people living in the arid and semi-arid tropics who depend on sorghum as their staple food. This is because of poor lysine content and digestibility of sorghum proteins, which aggravates when sorghum is cooked in food. To address this nutritional problem, compositing with locally available lysine-rich legumes has been proposed. Therefore, this study investigated the effects of compositing with the African grain legume, cowpea, on the protein and functional quality of important traditional African sorghum foods. Two sorghum cultivars, a red, tannin (NS 5511) and a white tan plant, non-tannin (Orbit) composited with cowpea at 70:30 ratio, were used to prepare three traditional sorghum foods, ugali (unfermented thick porridge), uji (fermented thin porridge) and injera (fermented flatbread). The protein quality of the traditional sorghum foods was determined by measuring their protein contents, lysine and reactive lysine contents, and in vitro protein digestibility. The functional properties of the foods were studied using instrumental texture analysis. Other sensory properties of ugali were determined using a trained sensory panel. Compositing with cowpea increased the protein contents of the foods by up to 35% and 57% for NS 5511 and Orbit foods, respectively. Lysine contents of the food proteins increased by 67% to 139%. Reactive lysine content increased by 10% to 75%. Protein digestibility of the foods increased by 13% to 62%. There was approximately three- and two-fold increase in protein digestibility corrected amino score (PDCAAS) of NS 5511 and Orbit foods, respectively, due to addition of cowpea. However, Orbit-plus-cowpea foods still had better protein quality than NS 5511-plus-cowpea foods, primarily because of the tannins in the latter which bind the proteins thereby lowering their digestibility. Compositing reduced paste peak viscosity (PV) and cool paste viscosity (CPV) of uji porridge by 6% to 23%, and 6% to 12%, respectively, probably as a result of decreasing porridge starch content. Principal component analysis (PCA) showed that compositing contributed 38% of the variation in 17 sensory attributes of ugali. Compositing imparted cowpea flavour to ugali. Most of the variation in sensory properties (59%) of ugali was due to the quality characteristics of the sorghum cultivars. Compositing increased the stiffness of NS 5511 injera by up to 25%, while it reduced the stiffness of Orbit injera by up to 12%. These differences in stiffness suggested a weakening effect of weaker H-bonding between tannins and other food polymers such as proteins instead of stronger covalent bonds like those involved in proteins-protein interactions. Compositing important traditional sorghum foods with cowpea has potential for helping to solve lysine deficiency faced by sorghum consumers in the semi-arid tropics. However, it introduces cowpea flavour which may need to be eliminated, in foods intended for consumers not accustomed to cowpea flavour. Copyright en
dc.description.availability unrestricted en
dc.description.department Food Science en
dc.identifier.citation Anyango, JO 2009, Improvement in the protein quality of African sorghum foods through compositing with cowpea, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/27296 > en
dc.identifier.other E10/402/gm en
dc.identifier.upetdurl http://upetd.up.ac.za/thesis/available/etd-08162010-134712/ en
dc.identifier.uri http://hdl.handle.net/2263/27296
dc.language.iso en
dc.publisher University of Pretoria en_ZA
dc.rights © 2009, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. en
dc.subject African grain en
dc.subject Cowpea flavour en
dc.subject Sorghum foods en
dc.subject Staple food en
dc.subject UCTD en_US
dc.title Improvement in the protein quality of African sorghum foods through compositing with cowpea en
dc.type Dissertation en


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