Bioplastic film making properties of quality protein maize (QPM) zein

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dc.contributor.author Baloyi, Julia Thandikile
dc.contributor.author Taylor, Janet
dc.contributor.author Taylor, J.R.N. (John Reginald Nuttall)
dc.date.accessioned 2024-03-20T08:17:02Z
dc.date.available 2024-03-20T08:17:02Z
dc.date.issued 2023-07
dc.description.abstract BACKGROUND AND OBJECTIVE : Quality protein maize (QPM) has abundant γ-zein, which crosslinks itself and other zeins through disulfide bonding. The work aims to develop zein bioplastics with better functionality by using QPM zein. Physical properties of cast QPM zein films from QPM maize were compared with zein films from regular maize types and commercial zein, all without added plasticizers. FINDINGS : QPM zein contained 3.8% cysteine compared with 1.8%–2.7% in regular maize zeins and 1% in commercial zein and the QPM zein had a much higher proportion of γ-zein. QPM zein films cast from glacial acetic acid (GAA) were opaque but absorbed the least liquid (≈16%) and swelled less (≈11%) after buffer immersion than the other zein films and aqueous ethanol-cast films. Notably, the GAA-cast QPM zein films became highly flexible after ambient storage, whereas the other zein films remained brittle. CONCUSIONS : The low buffer uptake and swelling of QPM zein films is attributed to crosslinking involving the cysteine-rich γ-zein polypeptides. Their flexibility is attributed to better solubilization of the zein in GAA and water molecules bound to the γ-zein polypeptides acting as a plasticizer. SIGNIFICANCE AND NOVELTY : QPM zein can enable the formation of flexible zein bioplastics without added plasticizers. en_US
dc.description.department Consumer Science en_US
dc.description.department Food Science en_US
dc.description.librarian hj2024 en_US
dc.description.sdg SDG-02:Zero Hunger en_US
dc.description.sponsorship The South African National Research Foundation. en_US
dc.description.uri https://wileyonlinelibrary.com/journal/cche en_US
dc.identifier.citation Baloyi, J.T., Taylor, J.,& Taylor, J.R.N. (2023). Bioplastic filmmaking properties of quality protein maize (QPM) zein. Cereal Chemistry, 100, 805–815. https://doi.org/10.1002/cche.10665. en_US
dc.identifier.issn 0009-0352 (print)
dc.identifier.issn 1943-3638 (online)
dc.identifier.other 10.1002/cche.10665
dc.identifier.uri http://hdl.handle.net/2263/95300
dc.language.iso en en_US
dc.publisher Wiley en_US
dc.rights © 2023 The Authors. Cereal Chemistry published by Wiley Periodicals LLC on behalf of Cereals & Grains Association. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License. en_US
dc.subject Quality protein maize (QPM) en_US
dc.subject Bioplastic films en_US
dc.subject Y-zein en_US
dc.subject Cysteine en_US
dc.subject Two-dimensional polyacrylamide gel electrophoresis en_US
dc.subject SDG-02: Zero hunger en_US
dc.title Bioplastic film making properties of quality protein maize (QPM) zein en_US
dc.type Article en_US


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