Herbert Budzikiewicz - Böcker
Visar alla böcker från författaren Herbert Budzikiewicz. Handla med fri frakt och snabb leverans.
2 produkter
2 produkter
Del 92 - Fortschritte der Chemie organischer Naturstoffe Progress in the Chemistry of Organic Natural Products
Fortschritte der Chemie organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products, Vol. 92
Inbunden, Engelska, 2010
2 173 kr
Skickas inom 10-15 vardagar
Resin glycosides are part of a very extensive family of secondary metabolites known as glycolipids or lipo-oligosaccharides and are constituents of complex resins (glycoresins) (1) unique to the morning glory family, Convolvulaceae (2). These active principles are responsible for the drastic purgative action of all the important Convolvulaceous species used in traditional medicine throughout the world since ancient times. Several commercial purgative crude drugs can be prepared from the roots of different species of Mexican morning glories. Their incorporation as therapeutic agents in Europe is an outstanding example of the assimilation of botanical drugs from the Americas as substitutes for traditional Old World remedies (3). Even though phytochemical investigations on the constituents of these drugs were initiated during the second half of the nineteenth century, the structure of their active ingredients still remains poorly known for some examples of these purgative roots. During the last two decades, the higher resolution c- abilities of modern analytical isolation techniques used in conjunction with pow- ful spectroscopic methods have facilitated the elucidation of the active principles of these relevant herbal products. This chapter describes the ethnobotanical information associated with the p- gative morning glory species and how traditional usages were instrumental in plant selection for chemical studies. The advantages and limitations of available analy- cal techniques for the isolation, puri?cation, and structure characterization of the individual constituents of these complex glycoconjugates are also discussed.
596 kr
Skickas inom 5-8 vardagar
Die Massenspektrometrie, besonders in Kombination mit anderen Verfahren hat sich mittlerweile zu einer der wichtigsten Analysemethodenentwickelt, und zwar nicht nur in der Chemie, sondern auch in Nachbardisziplinen wie der Umweltanalytik, den Polymerwissenschaften,oder der Medizin. Die Neuaufl age dieser bewahrten Einfuhrung vermittelt den Nutzern die Grundlagen der Massenspektrometrie, tragt aber auch den rasantenWeiterentwicklungen der letzten Jahre Rechnung. Neben apparativen Neuentwicklungen auf dem Gebiet der Analysatoren sowie bei neuenIonisationsmethoden werden auch inzwischen etablierte Methoden und neue Anwendungsfelder - Umwelt-, Doping-, Lebensmittel-, Proteomics- Analytik - anhand von ausgearbeiteten Beispielen erlautert. Master-Studenten aller chemie-nahen Studiengange werden mit klarer Didaktik Grundlagen, aktuelle Techniken sowie neue Entwicklungenin der Massenspektrometrie vermittelt.