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Abstract
It is shown that 5-hydroxymethylfurfural (HMF) readily reacts with Dreywood’s anthrone reagent at AO C. Gelatins do not give a positive result at this temperature and the normal reaction at 100 C. is therefore ascribed to the presence of a sugar which has first to be decomposed by HMF. The rate of colour formation given by gelatins is similar to that of glucose or dextran (a polyglucose). The sugar in gelatin is believed to be glucose (or possibly mannose or galactose) combined in the form of a polysaccharide.