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

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

doi:10.1080/10601329808000974

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

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

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Abstract

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 language	English (US)
Pages (from-to)	1603-1614
Number of pages	12
Journal	Journal of Macromolecular Science - Pure and Applied Chemistry
Volume	35
Issue number	10
DOIs	https://doi.org/10.1080/10601329808000974
State	Published - 1998

All Science Journal Classification (ASJC) codes

Ceramics and Composites
General Chemistry
Polymers and Plastics
Materials Chemistry

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

abstract = "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.",

author = "Barrett, {Albert J.} and Barrett, {Karen L.} and Arshad Khan",

note = "Funding Information: We acknowledge a research development grant from Penn State and a DuBois Educational foundation grant for the partial support of this work, and the experi - mental assistance of C. Palmer and R. Shook",

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T1 - Effects of acetone, ethanol, isopropanol and dimethyl sulfoxide on amylose-iodine complex

AU - Barrett, Albert J.

AU - Barrett, Karen L.

AU - Khan, Arshad

N1 - Funding Information: We acknowledge a research development grant from Penn State and a DuBois Educational foundation grant for the partial support of this work, and the experi - mental assistance of C. Palmer and R. Shook

PY - 1998

Y1 - 1998

N2 - 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.

AB - 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.

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

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