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Microwave assisted acetylation of mung bean starch and the catalytic activity of potassium carbonate in free‐solvent reaction
Author(s) -
Bushra Maisa,
Xu XiaoYun,
Pan SiYi
Publication year - 2013
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.201200081
Subject(s) - starch , potassium carbonate , potassium , vinyl acetate , chemistry , catalysis , nuclear chemistry , solvent , transesterification , organic chemistry , polymer chemistry , copolymer , polymer
Mung bean starch acetate has been successfully produced with transesterification reaction of the starch under microwave assistance using vinyl acetate (VAC) as esterifying agent and potassium carbonate (K 2 CO 3 ) as a catalyst. Various concentration of potassium carbonate (0–0.117 mmoleq/AGU) was resulted in starch acetate with increased mood of the degree of substitution (DS = 0.003–0.27) in a short time. An increase in the degree of substitution, resulting in increase of the peak intensity of ester carbonyl group (CO) at 1742 cm −1 , which was further proved by FTIR. Obvious change in the starch granules morphology, increasing in the hyrophilicity and decreasing in the temperature and enthalpy of gelatinization were noticed accordingly to the degree of the starch modification. The X‐ray pattern of native starch was A type, with similar pattern in modified derivatives.