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Synthesis of carboxymethyl potato starch and comparison of optimal reaction conditions from different sources
Author(s) -
Bi Yinghui,
Liu Mingzhu,
Wu Lan,
Cui Dapeng
Publication year - 2008
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1102
Subject(s) - sodium hydroxide , starch , scanning electron microscope , fourier transform infrared spectroscopy , molar ratio , isopropyl alcohol , isopropyl , nuclear chemistry , materials science , potato starch , organic chemistry , chemistry , chemical engineering , composite material , catalysis , engineering
Carboxymethyl potato starch (CMPS) was synthesized under heterogeneous reaction conditions. The influences of etherification temperature, alkalization and etherification time, sodium hydroxide to monochloroacetic acid (MCA) molar ratio ( n NaOH / n MCA ), theoretical degree of substitution (DS t ), the ratio of isopropyl alcohol (IPA) volume to starch mass ( v IPA / m st ) on degree of substitution (DS) and reaction efficiency (RE) of CMPS were investigated. Compared with the previous literature data, the results had significant difference for the optimal carboxymethylation conditions of potato starch from different sources. CMPS prepared under optimal conditions showed the highest DS and RE, which were 1.36 and 0.88, respectively. Furthermore, the RE value in this work is considerably higher than that reported in the literature. The time of alkalization and etherification were also discussed independently. In addition, CMPS was characterized by Fourier transform infrared spectrophotometry and scanning electron microscopy (SEM). Copyright © 2008 John Wiley & Sons, Ltd.