Synthesis of long-chain fatty acid starch esters in aqueous medium and its characterization

Kairui Zhang, Fei Cheng, Kang Zhang, Jianbo Hu, Changxue Xu, Yi Lin, Mi Zhou, P. Zhu

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Long-chain fatty acid starch esters are prepared by esterification of stearic acid or lauric acid with corn starch in urea/NaOH aqueous solutions. Effect of esterify condition on the degree of substitution (DS) and the structure and performance of the products are studied. The synthesized starch stearate and starch laurate are obtained a DS of 0.065 and 0.074, respectively, higher than the reported values by the water medium method. Esterification of starch is proved by Fourier transformed infrared and 1H nuclear magnetic resonance. The structure and thermal properties of starch esters are confirmed by X-ray diffraction, Scanning Electron Microscope, Thermogravimetry and Differential Scanning Calorimetry. The results show that the starch esters, with lower crystallinity than starch, has better thermostability, emulsibility, transparency, freeze-thaw stability and moisture absorption than native starch, but higher glass transition temperature (Tg) within the limited DS.

Original languageEnglish
Pages (from-to)136-147
Number of pages12
JournalEuropean Polymer Journal
Volume119
DOIs
StatePublished - Oct 2019

Keywords

  • Degree of substitution
  • Lauric acid
  • Starch esterification
  • Stearic acid
  • Water-medium method

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