Deoxy-fructosazine and its 6-isomer were isolated from the browning mixture prepared by the reaction between glucose and ammonia in weak acidic medium, and were identified, respectively. The two compounds among all pyrazine derivatives formed in the reaction were incomparably abundant in approximately equal ratio. It was supposed that deoxy fructosazine and its 6-isomer would be formed concurrently by condensation of ammonia with 3-deoxy-glucosone and isoglucosamine.

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The oligosaccharides produced by the title reaction were dealt with. After removal of the most of palatinose the reaction mixture was used as the sample. Carbon-celite chromatography of the sample(40g, 66•‹ Brix)gave three saccharides(saccharide A, B and C), besides palatinose and sucrose. Saccharide A was obtained as syrup(2.0g)and identified as 1-ƒ¿-D-glucopyranosyl-Dfructofuranose by chemical reactions and some chromatographic analyses such as HPLC, GLC, TLC and PC, and by the fragmentation analysis of GC-MS. It tasted sweet.

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