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Preparation of crystalline starch nanoparticles using cold acid hydrolysis and ultrasonication

Authors
Kim, Hee-YoungPark, Dong JuneKim, Jong-YeaLim, Seung-Taik
Issue Date
15-10월-2013
Publisher
ELSEVIER SCI LTD
Keywords
Starch; Nanoparticles; Nanocrystals; Acid hydrolysis; Ultrasonication
Citation
CARBOHYDRATE POLYMERS, v.98, no.1, pp.295 - 301
Indexed
SCIE
SCOPUS
Journal Title
CARBOHYDRATE POLYMERS
Volume
98
Number
1
Start Page
295
End Page
301
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/101865
DOI
10.1016/j.carbpol.2013.05.085
ISSN
0144-8617
Abstract
Waxy maize starch in an aqueous sulfuric acid solution (3.16 M, 14.7% solids) was hydrolyzed for 2-6 days, either isothermally at 40 degrees C or 4 degrees C, or at cycled temperatures of 4 and 40 degrees C (1 day each). The starch hydrolyzates were recovered as precipitates after centrifuging the dispersion (10,000 rpm, 10 min). The yield of starch hydrolyzates depended on the hydrolysis temperature and time, which varied from 6.8% to 78%. The starch hydrolyzed at 40 degrees C or 4/40 degrees C exhibited increased crystallinity determined by X-ray diffraction analysis, but melted in broader temperature range (from 60 degrees C to 110 degrees C). However, the starch hydrolyzed at 4 degrees C displayed the crystallinity and melting endotherm similar to those of native starch. The starch hydrolyzates recovered by centrifugation were re-dispersed in water (15% solids), and the dispersion was treated by an ultrasonic treatment (60% amplitude, 3 min). The ultrasonication effectively fragmented the starch hydrolyzates to nanoparticles. The hydrolyzates obtained after 6 days of hydrolysis were more resistant to the ultrasonication than those after 2 or 4 days, regardless of hydrolysis temperatures. The starch nanoparticles could be prepared with high yield (78%) and crystallinity by 4 degrees C hydrolysis for 6 days followed by ultrasonication. Scanning electron microscopy revealed that the starch nanoparticles had globular shapes with diameters ranging from 50 to 90 nm. (C) 2013 Elsevier Ltd. All rights reserved.
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