Effects of acetone, ethanol, isopropanol, and dimethyl sulfoxide on amylose-iodine complex

Albert J. Barrett, Karen L. Barrett, Arshad Khan

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3 Scopus citations


The amylose-iodine (AI) complex formation was studied by absorption spectra in water and water containing varying proportions of ethanol,acetone, isopropanol and dimethyl sulfoxide (DMSO). Complex formation is most favored in pure water and decreases as the proportion of nonaqueous solvent is increased. A decrease in the absorbance intensity at around 615 nm (for AI complex) is accompanied by a peak shift towards 550 nm and an increased absorbance at around 350 nm (for unbound iodine). The amount of the nonaqueous solvent added, as well as the order in which it is added relative to amylose and iodine solution, change remarkably the extent of the AI complex formation. A mechanism of the complex formation is proposed.

Original languageEnglish (US)
Pages (from-to)711-722
Number of pages12
JournalJournal of Macromolecular Science - Pure and Applied Chemistry
Issue number5
StatePublished - Jan 1 1998

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry


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