Abstract
The presences of furfural and 5-hydroxymethylfurfural in darkend tomato products were confirmed. The furfurals were characterized as the anti-forms of 2, 4-dinitrophenylhydrazone derivatives.Furfurals were extracted from the sample with ether and separated into furfural and 5-hydroxymethylfurfural by steam distillation. Furfurals were derived into hydrazones in the usual manner. Each hydrazone derivative was purified by column chromatography on acid alumina with benzene-ethyl acetate as eluent, respectively and recrystallized from ethanol-ethyl acetate. UV and IR data of purified hydrazones were identical with those of the authentic samples.
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