baccatin/taxus brevifolia

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Taxane-specific monoclonal antibodies: measurement of taxol, baccatin III, and "total taxanes" in Taxus brevifolia extracts by enzyme immunoassay.

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Three monoclonal antibodies with either specificity to taxol or baccatin III, or cross-reactivity with several common taxanes have been prepared and used to develop sensitive competitive-inhibition enzyme immunoassays. The hybridomas producing these monoclonal antibodies were obtained by fusing

Taxoids from the needles of the Canadian yew.

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Systematic characterization of the taxoids in the needles of Taxus canadensis led to the discovery of seven taxanes along with three known congeners. Their structures were rigorously established by spectroscopic methods as 15-benzoyl-10-deacetyl-2-debenzoyl-10-dehydro-abeo-baccat in III;

Cyclization of geranylgeranyl diphosphate to taxa-4(5),11(12)-diene is the committed step of taxol biosynthesis in Pacific yew.

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The biosynthesis of taxol (paclitaxel) and related taxoids in Pacific yew (Taxus brevifolia) is thought to involve the cyclization of geranylgeranyl diphosphate to a taxadiene followed by extensive oxygenation of this diterpene olefin intermediate. A cell-free preparation from sapling yew stems

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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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

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

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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

Inhibition of cancer cell proliferation and apoptosis-inducing activity of fungal taxol and its precursor baccatin III purified from endophytic Fusarium solani.

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BACKGROUND Taxol (generic name paclitaxel), a plant-derived antineoplastic agent, used widely against breast, ovarian and lung cancer, was originally isolated from the bark of the Pacific yew, Taxus brevifolia. The limited supply of the drug has prompted efforts to find alternative sources, such as

Taxanes from Shells and Leaves of Corylus avellana.

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Paclitaxel is an effective antineoplastic agent originally extracted in low yield from the bark of Taxus brevifolia. Although it was generally considered a particular metabolite of Taxus sp., paclitaxel was recently found in hazel cell cultures. The aim of the present work was to verify whether

[Taxoids: structural and experimental properties].

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Paclitaxel (Taxol) and docetaxel (Taxotere) are the first representatives of a new class of antitumor compounds. These two taxoids are clinically active against breast, ovarian and lung cancers. Taxoids are highly complex diterpenoids form natural origin. Preclinical and clinical developments have

Taxus canadensis abundant taxane: conversion to paclitaxel and rearrangements.

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An efficient conversion of Taxus canadensis abundant taxane, 9-dihydro-13-acetylbaccatin III to baccatin III is described. Since the synthesis of paclitaxel from baccatin III has been reported, this work can be used for additional supply of this powerful anticancer drug. In addition, new taxanes

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

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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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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

Absolute Configuration Determination of a Taxol Precursor Based on Raman Optical Activity Spectra.

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Enantiomeric purity of drugs is essential for their biological activity. In the present study, we investigate the performance of Raman optical activity (ROA) spectroscopy in distinguishing four possible stereoisomers of the synthetic precursor used for the production of taxol from baccatin III.

Tour de paclitaxel: biocatalysis for semisynthesis.

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In collaboration with the National Cancer Institute, Bristol-Myers Squibb has developed paclitaxel for treatment of various cancers; it has been approved by the Food and Drug Administration for the treatment of ovarian and metastatic breast cancer. Originally paclitaxel was isolated and purified

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