Formation and isolation of nanocrystal complexes between dextrins and n-butanol

Jong Yea Kim, Jae Wook Yoon, Seung Taik Lim

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22 Citations (Scopus)

Abstract

Starch dextrins of different molecular sizes (DP n 311, 142 and 39) were prepared by hydrolyzing a high amylose maize starch in acidic alcohol solutions. The dextrins were dissolved in an aqueous dimethyl sulfoxide solution (90% DMSO), and then the solution was allowed to migrate down into n-butanol separated by a membrane filter. The complex was gradually formed between the dextrin and butanol, and precipitated in the butanol layer. The dextrin-butanol complex yielded V6-I type crystals with broad reflections (d-spacings 1.123, 0.657 and 0.429 nm) under X-ray diffractograms. Platelets of average length less than 100 nm, interspersed in amorphous matrices, were observed in complexes of DP n 311 and 142, but that of DP n 39 showed different morphology, and the formation of complexes was limited. By hydrolyzing the complex of DP n 311 with α-amylase, amorphous matrices were selectively removed, and crystallites of 23-72 nm showing a V6-I X-ray diffraction pattern were obtained. However, crystallites in complexes of DP n 142 and 39 were eroded by amylolysis, forming large aggregates.

Original languageEnglish
Pages (from-to)626-632
Number of pages7
JournalCarbohydrate Polymers
Volume78
Issue number3
DOIs
Publication statusPublished - 2009 Oct 15

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Keywords

  • Complex
  • Dextrin
  • n-Butanol
  • Nanocrystals
  • Starch

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics

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