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Effect of Alkali Treatment on Structure and Properties of High Amylose Corn Starch Film

Alkali treatment is used for melt extrusion film formation with corn starch, but optimal conditions for this procedure are still unknown. In this study, the changes in properties and structure of high amylose corn starch (70%) films with different concentrations of sodium hydroxide (NaOH), prepared...

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Detalles Bibliográficos
Autores principales: Qin, Yang, Zhang, Hui, Dai, Yangyong, Hou, Hanxue, Dong, Haizhou
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6566725/
https://www.ncbi.nlm.nih.gov/pubmed/31130680
http://dx.doi.org/10.3390/ma12101705
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author Qin, Yang
Zhang, Hui
Dai, Yangyong
Hou, Hanxue
Dong, Haizhou
author_facet Qin, Yang
Zhang, Hui
Dai, Yangyong
Hou, Hanxue
Dong, Haizhou
author_sort Qin, Yang
collection PubMed
description Alkali treatment is used for melt extrusion film formation with corn starch, but optimal conditions for this procedure are still unknown. In this study, the changes in properties and structure of high amylose corn starch (70%) films with different concentrations of sodium hydroxide (NaOH), prepared by melting extrusion, were investigated. With increasing sodium hydroxide concentrations, the tensile strength of the high-amylose starch film decreased gradually, while the elongation at break increased. The tensile strength of the high amylose starch (HAS) film with 2% NaOH-treatment was 10.03 MPa and its elongation at break was 40%. A 2% NaOH-treatment promoted the orderly rearrangement of starch molecules and formed an E(h)-type crystal structure, which enlarged the spacing of the single helix structure, increased the molecular mobility of the starch, and slowed down the process of recrystallization; a 10% NaOH-treatment oxidized the hydroxyl groups of the high amylose corn starch during extrusion, formed a poly-carbonyl structure, and initiated the degradation and cross-linking of starch molecule chains.
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spelling pubmed-65667252019-06-17 Effect of Alkali Treatment on Structure and Properties of High Amylose Corn Starch Film Qin, Yang Zhang, Hui Dai, Yangyong Hou, Hanxue Dong, Haizhou Materials (Basel) Article Alkali treatment is used for melt extrusion film formation with corn starch, but optimal conditions for this procedure are still unknown. In this study, the changes in properties and structure of high amylose corn starch (70%) films with different concentrations of sodium hydroxide (NaOH), prepared by melting extrusion, were investigated. With increasing sodium hydroxide concentrations, the tensile strength of the high-amylose starch film decreased gradually, while the elongation at break increased. The tensile strength of the high amylose starch (HAS) film with 2% NaOH-treatment was 10.03 MPa and its elongation at break was 40%. A 2% NaOH-treatment promoted the orderly rearrangement of starch molecules and formed an E(h)-type crystal structure, which enlarged the spacing of the single helix structure, increased the molecular mobility of the starch, and slowed down the process of recrystallization; a 10% NaOH-treatment oxidized the hydroxyl groups of the high amylose corn starch during extrusion, formed a poly-carbonyl structure, and initiated the degradation and cross-linking of starch molecule chains. MDPI 2019-05-26 /pmc/articles/PMC6566725/ /pubmed/31130680 http://dx.doi.org/10.3390/ma12101705 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Qin, Yang
Zhang, Hui
Dai, Yangyong
Hou, Hanxue
Dong, Haizhou
Effect of Alkali Treatment on Structure and Properties of High Amylose Corn Starch Film
title Effect of Alkali Treatment on Structure and Properties of High Amylose Corn Starch Film
title_full Effect of Alkali Treatment on Structure and Properties of High Amylose Corn Starch Film
title_fullStr Effect of Alkali Treatment on Structure and Properties of High Amylose Corn Starch Film
title_full_unstemmed Effect of Alkali Treatment on Structure and Properties of High Amylose Corn Starch Film
title_short Effect of Alkali Treatment on Structure and Properties of High Amylose Corn Starch Film
title_sort effect of alkali treatment on structure and properties of high amylose corn starch film
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6566725/
https://www.ncbi.nlm.nih.gov/pubmed/31130680
http://dx.doi.org/10.3390/ma12101705
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