Abstract
The acetone extract from the fruit body of Sarcodon aspratus (Berk.) S. Ito showed moderate angiotensin I converting enzyme (ACE) inhibitory activity, dMannitol was isolated from S. aspratus by sequential extraction with w-hexane and acetone followed by purification with activated char powder. Yield of the compound was 0.3% based on dry material. D-Arabitol was also found in the acetone extract. These compounds showed moderate ACE inhibitory activities, and the concentrations required to inhibit 50% of the ACE activity (IC_<50>) were 33.4 and 34.5mg/ml, respectively. The inhibition patterns on ACE of these two polyhydric alcohols and D-sorbitol (IC_<50> value: 31.9mg/ml) were investigated using LineweaverBurk plots. As a result, they acted as competitive inhibitors for ACE, suggesting that they are antagonists against the substrate binding to the active site of ACE. These results also indicated that polyhydric alcohols that consisted of a straight chain with more than five carbon atoms were more potent inhibitors.
