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Type Journal Article - International Journal of Biological Macromolecules
Title Microstructure, thermal properties and crystallinity of amadumbe starch nanocrystals
Author(s)
Volume 102
Publication (Day/Month/Year) 2017
Page numbers 241-247
URL http://doi.org/10.1016/j.ijbiomac.2017.04.030
Abstract
Amadumbe (Colocasia esculenta), commonly known as taro is a tropical tuber that produces starch-rich underground corms. In this study, the physicochemical properties of starch nanocrystals (SNC) prepared by acid hydrolysis of amadumbe starches were investigated. Two varieties of amadumbe corms were used for starch extraction. Amadumbe starches produced substantially high yield (25%) of SNC’s. These nanocrystals appeared as aggregated and individual particles and possessed square-like platelet morphology with size: 50–100 nm. FTIR revealed high peak intensities corresponding to Osingle bondH stretch, Csingle bondH stretch and H2O bending vibrations for SNCs compared to their native starch counterparts. Both the native starch and SNC exhibited the A–type crystalline pattern. However, amadumbe SNCs showed higher degree of crystallinity and slightly reduced melting temperatures than their native starches. Amadumbe SNCs presented similar thermal decomposition property as their native starches. Amadumbe starch nanocrystals may have potential application in biocomposite films due to their square-like platelet morphology.

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