9 resultados
BACKGROUND
Artemisinin (ART) is an efficacious and safe anti-malarial drugs but has low oral bioavailability and auto-induction profiles during multiple dosing. The pharmacokinetic disadvantages have been found to partially depend on the induction of cytochrome P-450 enzymes by ART and resulted in
OBJECTIVE
To investigate the chemical constituents of dried whole plants of Artemisia annua.
METHODS
The chemical constituents were isolated by repeated silica gel chromatography, medium pressure column chromatography, and semi-preparative HPLC, and their structures were elucidated by spectroscopic
OBJECTIVE
A pot experiment with variable fertilizer treatments was carried out to study the influence of fertilization on the concentration and accumulation of polyphenols, scopoletin, chrysosplenol-D and chrysosplenetin in roots, stems and leaves and their antioxidant activities. The main aims were
Artemisia annua tea is a popular dosage form used to treat and prevent malaria in some developing countries. However, repeated drinking leads to an obviously decreased efficacy, which may be related to the induction of metabolizing enzymes by artemisinin. In the present study, the ability of
Artemisia arborescens, also known as tree wormwood, is a typical species of the Mediterranean flora. It has been used in folk medicine for its antispasmodic, anti-pyretic, anti-inflammatory, and abortifacient properties. In the current study, the application of multidimensional comprehensive gas
A phytochemical reinvestigation of the aerial parts of Artemisia sieversiana gave a new guaianolide and two known flavones (chrysosplenetin and 5-hydroxy-3',4',6,7-tetramethoxyflavone). Antifungal fractions derived from the chloroform extract of A. annua afforded two cadinane derivatives (arteannuin
BACKGROUND
Natural products, including those derived from higher plants have, over the years, contributed greatly to the development of modern therapeutic drugs. Due to the medicinal importance in traditional practice and the diversified biology and chemistry of the constituents from Artemisia spp.,
OBJECTIVE
To study the chemical constituents of Artemisia rupestris.
METHODS
The chemical constituents were isolated by column chromatography on silical gel and sephadex LH - 20. Their structures were elucidated on the basis of spectral analysis.
RESULTS
8 compounds have isolated from this plant,
Two new thiophene derivatives (1 and 2), a new sesquiterpene (3), and 15 known compounds (4-18) were isolated from the whole plants of Artemisia rupestris. The new compounds (1-3) were elucidated by extensive spectroscopic techniques including