Titlebook: Natural Products in the New Millennium: Prospects and Industrial Application; Book 2002

FRET

Chemical Composition of , and ,ark and core of kenaf were done by GC-MS. The phenolic components of the acetone extracts of both plants were isolated by thin-layer chromatography and their structures established by spectroscopic methods. Several new natural compounds have been identified. The extensive structural elucidation of a

轻快来事

Novel Coumarin Sulfates from , of the 6- and 8-monosulfate of 6,8-dihydroxy-5,7-dimethoxycoumarin. Their structures were determined unambiguously by comprehensive analyses of their NMR and MS data. Attempts to synthesize these compounds by adopting the dicyclohexylcarbodiimide-mediated esterification of their parent highly oxyge

Endemic

Study of the Methanol Extract of ,l (.) and the tetracyclic triterpene 24-methylenecycloartanol (.) were isolated and identified. Their identification was based on spectroscopic data (IR, MS, .H and .C NMR). Scopoletin showed free radical scavenging activity against the 2,2-diphenyl-l-picrylhydrazyl (DPPH) radical and inhibited blea

misshapen

A Short Side Chain Cycloartane and Other Triterpenes from ,an-20-one (.). Its structure was established based on spectroscopic data including one and two dimensional NMR both for proton and carbon assignments The known tetracyclic triterpenes butyrospermol (.), lanosterol (.), 24-methylenelanosterol (.) and the steroid stigmast-4-en-3-one (.), were also iso

Deceit

HAWK

(Willk) P. Silva, Chemotype Celorico da Beira; the First Portuguese Chemotype-halimane, valparane and labdane skeleta. Eleven new compounds have been isolated, three .-halimanes (.), three labdanes (.), four valparanes . and two valparolanes (.). The total composition of the aerial parts of this plant allows the identification of Celorico da Beira . as a new chemotype.

翻动

臭名昭著

Grandstand

HPLC-ESI-MS: An Useful Alternative to FAB-MS in the Analysis of Intact Resin Glycosides from Convolvhnique has allowed a direct mass spectrometric investigation of underivatized resin glycosides. However HPLC coupled technique LC/ESIMS can be an useful and/or complimentary tool for resin glycosides analysis. Like FAB-MS, the use of on-line LC/ESI-MS has produced molecule-related ions in enough eff

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