Abstract
Piper-chromatographic and radioactive-tracer methods showed that gamma irradiation of oxygenated D-mannose solutions gives D-mannuronic acid, D-mannonic acid, Darabinose. D-erythrose, two-carbon aldehydic fragments. formic acid. and carbon dioxide. Changes in acidity, absorption spectra, and the rate of formation of hydrogen peroxide were measured. Primary and secondary products are distinguished by reference to the yield-dose curves than were obtained from isotope dilution analysis and paper chromatography; there is good agreement between the two methods. Experiments using D/sup -1-14C!mannose indicate directly that the primary degradation processes are (a) oxidation at C(6) and C(1) give mannuronic acid and mannonic acid. respectively: (b) direct scission between C(1) and C(2) io form D-arabinose and formaldehyde; and (c) scission between C(2) and C(3) to give D-erythrose and a two-carbon aldehydic fragment with. simultaneously, direct conversion of the hexose molecule into three two- carbon aldehydic figments. These account for 80% of the initial amount of D- mannose degraded (G 3.5). The results also indicate secondary formation of D- arabinose, D-lyxose, oxalic acid, formic acid. and carbon dioxide. (auth)
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