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Separation of triphenyl atropisomers of a pharmaceutical compound on a novel mixed mode stationary phase: A case study involving dynamic chromatography, dynamic NMR and molecular modeling

nalysis of atropisomers is of considerable interest in the pharmaceutical industry. For complex chiral molecules with several chiral centers hindered axial rotation can lead to formation of interconverting diastereomers that should be separable on achiral stationary phases.

出版机构:Elsevier Science

刊物名称:Journal of Chromatography A

出版时间:2010

ISSN:0021-9673

数据源:报刊文摘

Comprehensive separation and identification of chemical constituents from Apocynum venetum leaves by high-performance counter-current chromatography and high performance liquid chromatography coupled with mass spectrometry

For HPCCC separation, four sets of solvent systems, n-hexane?ethyl acetate?acetonitrile?water (1.5:3.5:2:4.5, v:v:v:v), ethyl acetate?methanol?water (5:2:5, v:v:v) and n-butanol?methanol?water (5:1:5, v:v:v) were used for the one-step separation by four stages.

出版机构:Elsevier Science

刊物名称:Journal of Chromatography B, Analytical Technologies in the Biomedical and

出版时间:2010

ISSN:1570-0232

数据源:报刊文摘

Characterisation of blends of polyisoprene and polystyrene by on‐line hyphenation of HPLC and 1H‐NMR: LC‐CC‐NMR at critical conditions of both homopolymers

Blends of polystyrene (PS) and polyisoprene (PI) were analysed by on?line hyphenation of LC at critical conditions and 1H?NMR. Chromatography at critical conditions was established for both PS and PI.

出版机构:WILEY‐VCH Verlag

刊物名称:Journal of Separation Science

出版时间:2010

ISSN:1615-9306

数据源:报刊文摘

Catalytic Enantioselective Ring-Opening Reaction of meso-Epoxides with ArSeH Using a (Salen)Ti(IV) Complex

Enantioselective ring-opening reaction of meso-epoxides with arylselenols using a chiral (salen)Ti(IV) complex as catalyst was realized, and 1,2- arylseleno alcohols were obtained in good yields and up to 80 % ee.

出版机构:Bentham Science Publishers

刊物名称:Letters in Organic Chemistry

出版时间:2010

ISSN:1570-1786

数据源:报刊文摘

Important roles of the hyphenated HPLC‐DAD‐MS‐SPE‐NMR technique in metabonomics

Metabolite identification is a key step for metabonomics study. A fully automated hyphenation of HPLC?diode?array detector (DAD) mass spectrometry (MS) solid phase extraction (SPE)?NMR spectroscopy (HPLC?DAD?MS?SPE?

出版机构:John Wiley & Sons, Ltd.

刊物名称:Magnetic Resonance in Chemistry

出版时间:2009

ISSN:0749-1581

数据源:报刊文摘

Asymmetric Phase Transfer Reactions Catalyzed by Chiral Crown Ethers Derived from Monosaccharides

One of the practical applications of sugar-based crown ethers involves their use as chiral catalysts in enantioselective phase transfer reactions.

出版机构:Bentham Science Publishers

刊物名称:Letters in Organic Chemistry

出版时间:2010

ISSN:1570-1786

数据源:报刊文摘

Characterization of currently marketed heparin products: key tests for quality assurance

During the 2007 2008 heparin crisis, it was found that the United States Pharmacopeia (USP) testing monograph for unfractionated heparin sodium (UFH) did not detect the presence of the contaminant, oversulfated chondroitin sulfate (OSCS) in heparin.

出版机构:Springer Verlag

刊物名称:Analytical and Bioanalytical Chemistry

出版时间:2011

ISSN:1618-2642

数据源:报刊文摘

A simple chromatographic route for the isolation of meso diaminopimelic acid

Meso diaminopimelic acid is an important noncoded amino acid found in Gram?negative bacterial peptidoglycan. In spite of its importance, this stereoisomer is not available commercially.

出版机构:Wiley Subscription Services, Inc., A Wiley Company

刊物名称:Chirality

出版时间:2011

ISSN:0899-0042

数据源:报刊文摘

Structural elucidation of process-related impurities in escitalopram by LC/ESI-MS and NMR

Three impurities were detected in escitalopram bulk drug by HPLC?UV and LC/MS. These impurities were marked as ESC-I, -II and -III. Two of these impurities (ESC-II and -III) were unknown and have not been reported previously.

出版机构:Elsevier Science

刊物名称:Journal of Pharmaceutical and Biomedical Analysis

出版时间:2010

ISSN:0731-7085

数据源:报刊文摘

Identification of radiolysis products of solid thiamphenicol

Spectroscopic and chromatographic methods (HPLC, HPLC?MS, NMR) were used to observe, separate and identify products of radiolysis of thiamphenicol (TF), irradiated in the solid state at room temperature and atmospheric pressure with an electron beam from a linear accelerator to doses between 25 and

出版机构:Elsevier Science

刊物名称:Journal of Pharmaceutical and Biomedical Analysis

出版时间:2010

ISSN:0731-7085

数据源:报刊文摘