期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 59, 期 -, 页码 372-376出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2013.04.080
关键词
Acetylated corn starch; Degree of substitution; FTIR
资金
- National Natural Science Foundation of China [51273086, J1103307]
- Ministry of Education of China [20090211110004]
Acetylated corn starch (ACS) was synthesized by the reaction of native corn starch (NCS) with acetic anhydride (AA) and acetic acid in an aqueous medium in the presence of p-toluenesulfonic acid (PTSA) as a catalyst. The factors that could affect the degree of substitution (DS) of corn starch were investigated which included the reaction temperature and time, the volume ratio of AA to acetic acid and the usage of the catalyst PTSA. The optimal DS of 2.85 was obtained. Fourier transform infrared (FIR) spectrometry showed new bands at 1733, 1375 and 1252 cm(-1). As DS increased, the bands at 3400 cm(-1) and 1083 cm(-1) were gradually weakened. The scanning electron microscopy (SEM) of the ACS indicated that the exterior and interior of native starch were destroyed by the esterification. Wide angle X-ray diffraction revealed that the peaks at 15 degrees, 18 degrees, 20 degrees and 23 degrees were diminished, while the peak at 21 degrees became more distinct as the DS increased. Differential scanning calorimetry (DSC) thermograms exhibited that ACS had some lower gelatinization temperatures and enthalpies than NCS. (C) 2013 Elsevier B.V. All rights reserved.
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