cephalomannine/taxus brevifolia

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Taxol and related taxanes. I. Taxanes of Taxus brevifolia bark.

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Prijava / prijava

The published procedures for the isolation of taxol from the Pacific yew (Taxus brevifolia) and other species of Taxus are cumbersome, and the yields of taxol are in the range of 0.0075-0.01%. This paper describes a simple and efficient procedure for the isolation of taxol and its major natural

Seasonal and tissue variation in taxane concentrations of Taxus brevifolia.

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Analysis of seven taxanes: taxol, baccatin III, 10-deacetyltaxol, 10-deacetylbaccatin III, 7-xylosyl-10-deacetyltaxol, cephalomannine and brevifoliol in extracts from bark and foliage of pacific yew (Taxus brevifolia) showed a gradient of decreasing concentration from stem base to branch tip. This

Determination of taxanes in Taxus brevifolia extracts by tandem mass spectrometry and high-performance liquid chromatography.

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Prijava / prijava

A tandem mass spectrometric (ms/ms) method using desorption chemical ionization is described for the quantitation of taxol [1], cephalomannine [2], and baccatin III [3] found in Taxus brevifolia bark and needle extracts. A parent ion scan was used to simultaneously determine the weight percentages

A new large-scale process for taxol and related taxanes from Taxus brevifolia.

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OBJECTIVE In view of the demonstrated antitumor activity of taxol, ready availability of the drug is important. The current isolation methods starting from the bark of Taxus brevifolia involve multiple manipulations, leading to only taxol and in a yield of 0.01%. A new process consisting of a single

Effects of genetic, epigenetic, and environmental factors on taxol content in Taxus brevifolia and related species.

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Prijava / prijava

The demand for taxol, a promising cancer chemotherapeutic agent, far exceeds supply. Presently, taxol is derived from the bark of the Pacific yew, Taxus brevifolia, a small, slow-growing evergreen tree native to the northwestern United States. Knowledge of the distribution and magnitude of genetic

Taxol production in nodule cultures of Taxus.

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Prijava / prijava

The in vitro synthesis of secondary compounds from plants is one source of scarce and valuable phytopharmaceuticals. Often, some level of cellular or tissue differentiation is needed for the biosynthesis of many of these important compounds. Nodule cultures, consisting of cohesive multicellular

Screening of the needles of different yew species and cultivars for paclitaxel and related taxoids.

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Prijava / prijava

The needles of several yew species and cultivars were analysed by high-pressure liquid chromatography for paclitaxel, 10-deacetylpaclitaxel, cephalomannine, baccatin III, 10-deacetylbaccatin III and brevifoliol. About 750 samples were collected from five different locations in the Netherlands and

An enzyme immunoassay for the determination of taxol and taxanes in Taxus sp. tissues and human plasma.

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Prijava / prijava

A rapid and sensitive indirect competitive inhibition enzyme immunoassay (CIEIA) method has been developed for quantitating taxanes in extracts of Taxus brevifolia Nutt. tissue and in human plasma. High titer rabbit polyclonal antibodies (pAb) were raised against a conjugate of 7-succinyltaxol and

Chemical studies on Taxus canadensis.

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Prijava / prijava

A series of new taxanes, 1-93, have been isolated, together with 37 known taxoids including Taxol(®) (paclitaxel) and cephalomannine, from the Canadian yew, Taxus canadensis (Taxaceae) in the past 30 years. These new taxoids possess various skeletons containing 5/7/6, 6/10/6, 6/5/5/6, 6/8/6, and

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