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Two New Flavonol Glycosides From The Aerial Parts of Lotus lalambensis Growing in Saudi Arabia
Hanan M. El-Youssef,Brian T. Murphy,Masouda E. Amer,Adnan J. Al-Rehaily,Maged S. Abdel-Kader,David G. I. Kingston 한국생약학회 2008 Natural Product Sciences Vol.14 No.2
Phytochemical study of the aerial parts of Lotus lalambensis Schweinf resulted in the isolation and identification of two new flavonol glycosides; kaempferol 3-O-(5"-acetyl)-apioside-7-O-α-L-rhamnopyranoside (1) and kaempferol 3-O-α-[β-D-xylosyl-(1"" → 2")-L-rhamnopyranoside]-7-O-α-L-rhamnopyranoside (2). Structures were determined utilizing different physical, chemical, spectroscopic data including 2D-NMR experiments and HRFABMS.
Deuteromethylactin B from a Freshwater-derived Streptomyces sp.
Anam F. Shaikh,Maryam Elfeki,Samantha Landolfa,Urszula Tanouye,Stefan J.Green,Brian T. Murphy 한국생약학회 2015 Natural Product Sciences Vol.21 No.4
Compared to their terrestrial and marine counterparts, little is known about the capacity of freshwater-derived actinomycete bacteria to produce novel secondary metabolites. In the current study, we highlight the disparities that exist between cultivation-independent and -dependent analyses of actinomycete communities from four locations in Lake Michigan sediment. Furthermore, through phylogenetic analysis of strains isolated from these locations, we identified a Streptomyces sp., strain B025, as being distinct from other Streptomyces spp. isolated from sediment. Upon fermentation this strain produced a rare class of eight-membered lactone secondary metabolites, which have been for their antitumor properties. We used spectroscopic and chemical derivitization techniques to characterize octalactin B (1) in addition to its corresponding novel, unnatural degradation product (2).