Abstract
AbstractA method of carbonyl groups determination in starches oxidized with nitrogen tetroxide or sodium has been modified. The carbonyl groups undergo the reduction with sodium meta periodate borohydride, added in known excess in alkaline medium. The unconsumed amount of hydride is then oxidized with sodium periodate in alkaline medium and unconsumed iodate determined iodometrically. A blank test is unavoidable. Standard deviation 0.106% and variation coefficient 6,960% were found from 10 determinations of carbonyl groups in a sample of starch treated with nitrogen tetroxide to low degree of oxidation. Similarly, standard deviation 0,802% and variation coefficient 3,290% of dialdehyde starch, oxidized to high degree of oxidation by sodium metaperiodate, were found.
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