| boletunones a and b, highly functionalized novel sesquiterpenes from boletus calopus. | highly functionalized novel sesquiterpenes, named boletunones a and b, were isolated from the methanolic extract of the fruiting body of the mushroom boletus calopus. their structures and relative stereochemistry were established by various spectral analyses. [structure: see text] | 2004 | 14986984 |
| free radical-scavenging delta-lactones from boletus calopus. | the methanol extracts from the fruiting body of the mushroom boletus calopus showed free radical-scavenging activity. bioactivity-guided fractionation of the methanol extracts led to a new hydroxylated calopin named calopin b, along with the known delta-lactones calopin and cyclocalopin a. the structure of the new calopin analogue was elucidated by spectroscopic methods. all compounds showed potent free radical-scavenging activity against superoxide, dpph, and abts radicals with ic (50) values o ... | 2006 | 17091435 |
| in vitro inhibitory effects of pulvinic acid derivatives isolated from chinese edible mushrooms, boletus calopus and suillus bovinus, on cytochrome p450 activity. | increasing attention has been focused on food-drug interactions. we have investigated the inhibitory effect of chinese edible mushrooms, boletus calopus and suillus bovinus, on cytochrome p450 (cyp) 1a2, 2c9, 2d6, and 3a4, the main drug-metabolizing enzymes. three pulvinic acid derivatives, atromentic acid (1), variegatic acid (2), and xerocomic acid (3), isolated from boletus calopus and suillus bovinus, revealed nonspecific inhibitory effects on all four cyps. using these compounds, the maximu ... | 2009 | 19352038 |