This study was conducted to clarify the relationships between the inorganic constituents contents and the contents of catalpol and free sugars in the rhizoma of Rehmannia gluti nosa.
Nitrogen contents in rhizoma was positively correlated with the contents of catalpol and ethanol extract, whereas it was negatively correlated with that of ash, galactose and fructose.
Calcium contents in rhizoma was highly negatively correlated with the contents of catalpol, ethanol extract and water extract. However, the calcium contents positively correlated with that of ash, acid insoluble ash, fructose and galactose in R. glutinosa. The catalpol cotents was negatively correlated with the contents of ash, galactose and fructose, whereas positively correlated with that of ethanol extract and water extract, and the correlations between extract contents and ash contents showed highly negative significance.
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