Diuretic activity of the ethanol and aqueous extracts of the surface layer of Poria cocos in rat
2012
Zhao, Ying-Yong | Feng, Ya-Long | Du, Xiao | Xi, Zhi-Hui | Cheng, Xian-Long | Wei, Feng
ETHNOPHARMACOLOGICAL RELEVANCE: Poria cocos Wolf (Polyporaceae) is a well-known traditional East-Asian medicinal fungus. the epidermis (“Fu-Ling-Pi” in Chinese) of the sclerotia is used as a diuretic. This study was conducted to evaluate of ethanol extract (EE) and aqueous extract (AE) of the diuretic activity of Fu-Ling-Pi in saline-loaded rats. MATERIAL AND METHODS: The EE and AE were orally administered to rats. Urinary excretion rate, pH and electrolyte excretion were measured in the urine of saline-loaded rats. RESULTS: Urinary excretion rates were significantly increased by the EE. The three doses of AE only produced a slight increase urinary output. The EE had little or no effect on K⁺ excretion, but did indeed induce a notable excretion of Na⁺, that was in agreement with the urinary excretion. The three doses of AE produced an increase Na⁺ and K⁺ excretion, but did not arrive at statistical significance. CONCLUSIONS: The present study confirmed that the not aqueous but ethanol extracts of the epidermis of Poria cocos presents a remarkable diuretic effect.
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