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Disaccharide Formation in Thermal Degradation of Lactose

Laboratory of Animal Products Technology, College of Agriculture, Tohoku University Sendai, Japan

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ABSTRACT

Formation of oligosaccharides, especially disaccharides, from heating lactose in solid state and in molten state was examined. In heated lactose in solid state, lactulose, 3-0-ß-D-galactopyranosyl-D-glucose, and 6-0-ß-D-galactopyranosyl-D-glucose were detected. In the molten state, 6-0-ß-D-galactopyranosyl-D-galac-tose was detected in addition to the former three disaccharides. The identity of these compounds produced from lactose was established by methylation analysis and hydrolysis.

Analyses of the relative amounts of these disaccharides during the pyrolytic process showed that pyrolysis of lactose proceeded simultaneously through aldose-ketose isomerization, hydrolysis of lactose, and condensation of the resulting monosaccharides in the primary stage without cleavage of the carbohydrate carbon skeleton.

¹ Division of Research and Development, Zenkoku Nohkyoh Milk Industry Co., Tomisato, Chiba Ken.