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Microwave mediated preparation of nanoparticles from wx corn starch employing nanoprecipitation
Author(s) -
Juna Shazia,
Hayden Stephan,
Damm Markus,
Kappe Christian O.,
Huber Anton
Publication year - 2014
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.201300067
Subject(s) - corn starch , starch , urea , particle size , chemical engineering , nanoparticle , alkali metal , fractionation , chemistry , particle (ecology) , microwave , materials science , analytical chemistry (journal) , chromatography , nanotechnology , organic chemistry , oceanography , physics , quantum mechanics , geology , engineering
The influence of alkali concentration, temperature, concentration of urea and KSCN on the shapes and sizes of wx corn starch precipitates (isolated via nanoprecipitation) were studied. A strong correlation was found between the molecular and hydrodynamic characteristics, determined by using asymmetrical flow‐field flow fractionation (AF4), and the resultant sizes of micro‐ and nanostructures of wx corn starch precipitates (SEM images). Treatment of wx corn in alkaline media at higher temperatures employing a dedicated microwave reactor resulted in the formation of submicron particles (SEM analysis). The apparent molecular characteristics of wx corn starch heated in 1 M NaOH at various temperatures employing a microwave reactor, decreased with increasing temperature and with a corresponding decrease in particle sizes (SEM images of the precipitates). An expansion and decrease in the overall densities of the starch structures was observed for wx corn in 1 M urea, 0.2 M NaOH at 130°C resulting in smaller particle sizes.