AI Article Synopsis
- High-amylose potato starches were genetically modified to enhance their granule structure, resulting in higher amylose content and longer amylopectin chains.
- The structural changes improved the film properties, including better barrier and tensile strength, making these films stronger and more durable than those made from wild-type starch.
- The modified starches showed lower oxygen permeability, positioning them as a potential eco-friendly alternative to non-renewable barrier materials in packaging applications.
Article Abstract
High-amylose potato starches were produced through genetic modification resulting in changed granule morphology and composition, with higher amylose content and increased chain length of amylopectin. The increased amylose content and structural changes in amylopectin enhanced film-forming behavior and improved barrier and tensile properties in starch films. The molecular structure in these starches was related to film-forming properties. Solution-cast films of high-amylose starch revealed a homogeneous structure with increasing surface roughness at higher amylose content, possibly due to amylose aggregation. Films exhibited significantly higher stress and strain at break compared with films of wild-type starch, which could be attributable to the longer chains of amylopectin being involved in the interconnected network and more interaction between chains, as shown using transmission electron microscopy. The oxygen permeability of high-amylose starch films was significantly decreased compared with wild-type starch. The nature of the modified starches makes them an interesting candidate for replacement of non-renewable oxygen and grease barrier polymers used today.
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| http://dx.doi.org/10.1016/j.carbpol.2015.05.024 | DOI Listing |
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