Maltol and sugars in the leaves of Cercidiphyllum japonicum were examined and the presence of maltol (1.8-2.3%), fructose (2.6%), glucose (3.0%), and sorbitol (1.1%) was confirmed. The high amount of sugars was correlated to the amount of maltol all the year. This correlation is interesting from biosynthetic point of view, since it has been expected that maltol is synthesized from a sugar.
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