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Methyl jasmonate, a chemical inducer of secondary metabolism, was shown to promote tabersonine 2 biosynthesis in hairy root cultures of Catharanthus roseus. Tabersonine 6,7-epoxidase activity was detected in total protein extract of jasmonate-induced hairy root cultures using labeled 14 C-tabersonine 2. This enzyme converted tabersonine 2 to lochnericine 3 by selective epoxidation at...
Three new xanthone glycosides and a rare flavonoid glycoside have been isolated from the whole plant methanolic extract of Halenia corniculata (Gentianaceae). They were identified as 2,3,7-trimethoxy-1-O-primeverosyloxyxanthone, 2,3,4,7-tetramethoxy-1-O-primeverosyloxyxanthone, 2,3,4,5,7-pentamethoxy-1-O-primeverosyloxyxanthone and 7-O-primeverosylluteolin. Combined HPLC-UV and thermospray MS analyses...
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