Effect of structural characteristics of modified waxy corn starches on rheological properties, film‐forming solutions, and on water vapor permeability, solubility, and opacity of films

Waxy corn starch (amylopectin) and three of its chemical derivatives: acetylated cross‐linked (ACLS), oxidized (OS), and octenyl‐succinylated (OSA), were used together with additives such as Tween 80, sorbitol, and beeswax suspension or safflower oil to test their effect on film‐forming solutions (F...

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Bibliographic Details
Published in:Die Stärke 2012, Vol.64 (1), p.27-36
Main Authors: Pérez‐Gallardo, Alfonso, Bello‐Pérez, Luis A, García‐Almendárez, Blanca, Montejano‐Gaitán, Gerardo, Barbosa‐Cánovas, Gustavo, Regalado, Carlos
Format: Article
Language:English
Subjects:
amylopectin
Beeswax
Biological and medical sciences
Cereal and baking product industries
chemical derivatives
corn starch
Edible films and coatings
Food industries
Fundamental and applied biological sciences. Psychology
Modified corn starch
opacity
permeability
rheological properties
safflower oil
solubility
sorbitol
Starch and starchy product industries
Viscosity
water vapor
waxy corn
Yield stress
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Summary:Waxy corn starch (amylopectin) and three of its chemical derivatives: acetylated cross‐linked (ACLS), oxidized (OS), and octenyl‐succinylated (OSA), were used together with additives such as Tween 80, sorbitol, and beeswax suspension or safflower oil to test their effect on film‐forming solutions (FFS) and films. The objectives of this study were the starch structure characterization, and its correlation with rheological properties of FFS and solubility, opacity, and water vapor permeability (WVP) of the produced films. Analysis of starch structure, rheological characterization, and films micrographs revealed that the starches contained predominantly low MW amylopectin molecules and film properties depended on their ability to reorganize. Additionally, the interaction among groups introduced in modified starches or with additive molecules can hinder or promote starch reorganization, resulting in films with increased or reduced WVP, solubility and transparency properties. Films were obtained by casting and showed a thickness less than 41 µm. Films prepared with OS and beeswax exhibited the best reorganizing capacity of FFS, resulting in less soluble (30.0 ± 1.6%), highly transparent (23.2 ± 3.3 UA × nm) and less permeable films (0.485 ± 0.016 g · mm · m−2 · h−1 · kPa−1). On the other hand, ACLS showed an opposite trend which was attributed to a more open film structure. These results contribute to understand the molecular interactions of waxy starch molecules in FFS which may be useful to design tailored coatings.
ISSN:0038-9056
1521-379X
DOI:10.1002/star.201100042