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Formation of Deoxycompounds and Malondialdehyde in Irradiated Aqueous Solutions of Carbohydrates and Related Compounds

Heimo Scherz
Radiation Research
Vol. 43, No. 1 (Jul., 1970), pp. 12-24
DOI: 10.2307/3572854
Stable URL: http://www.jstor.org/stable/3572854
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Formation of Deoxycompounds and Malondialdehyde in Irradiated Aqueous Solutions of Carbohydrates and Related Compounds
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Abstract

The formation of malondialdehyde and deoxycompounds in aqueous solutions of carbohydrates and related compounds by irradiation with 10-MeV electrons and ${}^{60}{\rm Co}\text{-}\gamma \text{-rays}$ was investigated. The G-values for these substances were determined as a function of the pH in the absence of oxygen. For the deoxycompounds G-values below 0.1 were obtained at pH 2.0-4.5. In the range of pH 5.0-8.0 the G-values increased greatly, being 0.3 for most of the carbohydrates and 0.7 for some sugar alcohols. Free malondialdehyde appeared at pH 6.0-7.0. Its concentration increased sharply above pH 10, reaching G-values close to 1.0 at pH 13. In acid medium free malondialdehyde was found only in irradiated solutions of pentoses, fructose, glyceraldehyde, and glycerol. Studies using electron- and OH· -radical scavengers ( N2 O, Br-) indicated that the reactions are due to the OH· -radical. The mechanism of these reactions is discussed.

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