Abstract
When a fermentation medium consisting of the high concentration of K2HPO4 and KH2PO4 and glucose as a sole carbon source is autoclaved in the alkaline side, an unknown sugar is formed. This sugar is identified as psicose by paper chromatography and high-voltage paper electrophoresis. The notion that weak alkali causes the isomerization of reducing sugar could account for the formation of psicose in the medium. It is thus concluded that psicose is chemically formed from glucose in the alkaline side and in the high concentration of K2HPO4 and KH2PO4 during autoclaving.
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