Journal
CARBOHYDRATE POLYMERS
Volume 84, Issue 4, Pages 1413-1418Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2011.01.056
Keywords
Carboxymethyl cassava starch (CMCS); Nano-sized flake; Ultrasonic irradiation
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Funding
- National Key Technology RD Program [2007BA134B00]
- Natural Science Foundation of Zhejiang Province [Y4080107]
- Wenzhou Science & Technology Bureau Program [G20090079]
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An efficient method was described for the synthesis of nano-sized flake carboxymethyl cassava starch (CMCS) with high-degree substitution under ultrasonic irradiation. The scanning electron micrographs (SEM) revealed that nano-sized CMCS flakes with the substitution degree of 1.15 were in shape of hexagon with smooth surface and with the size of 100-400 nm. The substitution degree of carboxymethylation had a great influence on the morphology and the size of these CMCS. In addition, the effect of reaction parameters on DS value of CMCS was also studied, including the influence of the molar ratio of NaOH/starch, the molar ratio of monochloroacetic acid (MCA)/starch, reaction temperature, ultrasonic power and sonication time. (C) 2011 Elsevier Ltd. All rights reserved.
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