• YAKHAK HOEJI
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• v.50 no.1
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• pp.15-20
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• 2006

Puerarin and daidzin have been isolated from Puerariae thunbergiana Benth. Structures were determined by spectroscopic methods. Compounds showed weak antimicrobial activity against S. mutans, S. epidermidis, S. aureus, and C. albicans (MIC, $800{\mu}g/ml$). However, these compounds were not antioxidative. Puerariae thunbergiana Benth. extracts against microorganisms were evaluated in terms of the minimum inhibitory concentrations (MIC). In general, C. albicans was stronger antimicrobial activity than the other microorganisms. The antioxidative activity of was observed in the etyl acetate extract ($IC_{50},\;119.87{\pm}0.16\;{\mu}g/ml$). The DPPH radical scavenging effect ($IC_{50},\;1,673.3{\pm}0.54\;{\mu}M$) of the puerarin was comparable with that of synthetic antioxidant, BHA $(IC_{50},\;88.39{\pm}1.1){\times}10^{3}{\mu}M$. These results suggest that puerarin and daidzin have a potential antimicrobial activity.

• Archives of Pharmacal Research
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• v.26 no.3
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• pp.210-213
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• 2003

Puerariae Flos is a traditional herbal medicine that has long been used as a treatment for colds, diabetes, and hangovers. The herbal medicine contains a wide variety of isoflavones such as kakkalide, tectoridin, and tectorigenin. This study demonstrates that the substances undergo a certain degree of change depending on the storage period by the method of HPLC and $^{13}C-NMR$, and that the HPLC analysis can be used to determine the freshness of Puerariae Flos.