## Abstract Supercritical fluid extraction of oxindole alkaloids from __Uncaria Tormentosa__ is described. The extraction was performed with supercritical carbon dioxide alone and with supercritical carbon dioxide modified with 10% metanol, and the extracts were analyzed by GC/MS and HPLC/MS.
Capillary electrophoretic analysis of oxindole alkaloids fromUncaria tomentosa
✍ Scribed by Hermann Stuppner; Sonja Sturm; Gu¨nther Konwalinka
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 410 KB
- Volume
- 609
- Category
- Article
- ISSN
- 1873-3778
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## Abstract The single‐crystal X‐ray structures of speciophylline, mitraphylline, and rhynchophylline, oxindole alkaloids from the Peruvian climbing vine __Uncaria tomentosa__ (Rubiaceae), were determined. The three compounds show N⋅⋅⋅HN hydrogen bonding, which has not been observed in the crystal
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