John M. Berger | Researchain

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Featured researches published by John M. Berger.

Natural Product Research | 2009

Bakuchiol, an antibacterial component of Psoralidium tenuiflorum

P.-J. Hsu; James S. Miller; John M. Berger

Bioactivity guided fractionation of an EtOAc extract from Psoralidium tenuiflorum (Pursh) Rydb. (family : Fabaceae) yielded the known compound bakuchiol as a racemic mixture. This compound was purified by liquid–liquid partitioning and chromatography followed by NMR and GCMS characterisation. This compound exhibited Staphylococcus epidermidis cytotoxicity. COSY and HETCOR spectra of the isolated bakuchiol indicated two disagreements with previously reported NMR structural assignments; reassignments are described herein. Long-term storage of bakuchiol resulted in degradation to 4-hydroxybenzaldehyde, which was purified and characterised.

Journal of Natural Products | 2002

A new triterpene saponin from Pittosporum viridiflorum from the Madagascar rainforest.

Youngwan Seo; John M. Berger; Jeannine Hoch; Kim M. Neddermann; Isia Bursuker; Steven W. Mamber; David G. I. Kingston

Journal of Natural Products | 2001

Two bioactive saponins from Albizia subdimidiata from the suriname rainforest1

Maged S. Abdel-Kader; Jeannine Hoch; John M. Berger; Randy Evans; James S. Miller; Jan H. Wisse; Stephen W. Mamber; James M. Dalton; David G. I. Kingston

Journal of Natural Products | 2002

Efficient extraction of ginkgolides and bilobalide from Ginkgo biloba leaves.

Dirk Lichtblau; John M. Berger; Koji Nakanishi

Journal of Natural Products | 2002

Isolation and absolute configuration of ent-Halimane diterpenoids from Hymenaea courbaril from the Suriname rain forest.

Maged S. Abdel-Kader; John M. Berger; Carla Slebodnick; Jeannine Hoch; Stan Malone; Jan H. Wisse; Marga C. M. Werkhoven; Steven W. Mamber; David G. I. Kingston

Archive | 2003

METHOD FOR ISOLATING TERPENE TRILACTONES (GINKGOLIDES, BILOBALIDE) FROM LEAVES AND PHARMACEUTICAL POWDERS OF GINKGO BILOBA

Dirk Lichtblau; Nina Berova; John M. Berger; Koji Nakanishi

Pharmaceutical Biology | 1999

The Suriname International Cooperative Biodiversity Group Program: Lessons From The First Five Years

David G. I. Kingston; Maged S. Abdel-Kader; Bing-Nan Zhou; Shu-Wei Yang; John M. Berger; Hendrik van der Werff; James S. Miller; Randall Evans; Russell Mittermeier; Lisa Famolare; M. Guerin-McManus; Stanley Malone; Reggy Nelson; Etienne Moniz; Jan H. Wisse; Dinesh Vyas; J.J. Kim Wright; Songo Aboikonie

Archive | 1999

Biodiversity Conservation, Economic Development, and Drug Discovery in Suriname

Shu-Wei Yang; Hendrik van der Werff; John M. Berger; Maged S. Abdel-Kader; David G. I. Kingston; Jan H. Wisse; Lisa Famolare; Randall Evans; James S. Miller; Russell Mittermeier; Bing-Nan Zhou; Stanley Malone; Marianne Guerin-McManus

Journal of Chemical Education | 2008