ESR study of the effects of water, methanol, and ethanol on gamma-irradiation of starch

Journal Article · Wed Jul 01 04:00:00 EDT 1981 · J. Polym. Sci., Polym. Chem. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1981.170190712· OSTI ID:6323756

Henderson, A M; Rudin, A

This investigation deals with the nature and relative abundance of stable radicals formed by gamma-irradiation of wheat starch at room temperature. Additions of equal weights of water, methanol, and ethanol were equally effective in reducing the content of stable radicals in starch which contained about 12% water before the additions. When, however, the starting material was dried starch with 2.9% initial water content additional water and methanol were better radical scavengers than ethanol. This difference is attributed to the superior ability of water and methanol to permeate the starch structure. Superficially different ESR spectra were obtained in products made by irradiating starch and starch that contained added water or methanol. Computer simulation of these spectra showed that they could be matched by superposition of the spectra of the same four component radicals, with some adjustments of relative intensities and peak widths. The structure of these radicals have been deduced from the spectral assignments and relative effects of the three solvents used on the intensities of the respective ESR spectra.

• Research Organization: Univ. of Waterloo, Ontario
• OSTI ID: 6323756
• Journal Information: J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 19:7; ISSN JPLCA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALCOHOLS
CARBOHYDRATES
CEREALS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COMPARATIVE EVALUATIONS
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
ETHANOL
GAMMA RADIATION
GRAMINEAE
GRASS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
IONIZING RADIATIONS
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
METHANOL
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PLANTS
POLYMERIZATION
POLYSACCHARIDES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
REAGENTS
RESONANCE
SACCHARIDES
SCAVENGING
STARCH
WATER
WHEAT