Abstract
The binding of aldehyde on free amino groups of protein takes place during the heating of 2-furfuraldehyde with casein. The reaction is of the 1st order, but becomes a 0 order reaction (with respect to amino groups) in the first reaction stage in case of sufficient excess of 2-furfuraldehyde. Multifold excess of 2-furfuraldehyde is necessary for the complete blocking of free amino groups. The condensation product is transformed by heating to higher temperatures, especially above 100° C, to deep brown coloured polymer products. A free amino group and also another functional group of protein are necessary for the formation of brown pigments. The reaction with other proteins is similar to that of casein.
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