Výsledky vyhledávání - "Ulrich Woiwode"

Comparison of small size fully porous particles and superficially porous particles of chiral anion-exchange type stationary phases in ultra-high performance liquid chromatography: effect of particle and pore size on chromatographic efficiency and kinetic performance

Autor: Wolfgang Lindner, Kristina Schmitt, Michal Kohout, Ulrich Woiwode, Tong Zhang, Michael Lämmerhofer

Publikováno v: Journal of Chromatography A. 1569:149-159

Recent advancements in particle design are common in reversed-phase liquid chromatography (RPLC), but in chiral separations their use is still sporadic in commercially available chiral stationary phases (CSPs). Due to reported lower mass transfer res

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::05d70d8744394a407ac27f84f2e6a9bf
https://doi.org/10.1016/j.chroma.2018.07.056

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Enantioselective multiple heartcut two-dimensional ultra-high-performance liquid chromatography method with a Coreshell chiral stationary phase in the second dimension for analysis of all proteinogenic amino acids in a single run

Autor: Ulrich Woiwode, Michael Lämmerhofer, Stephan Buckenmaier, Stefan Neubauer, Wolfgang Lindner

Publikováno v: Journal of Chromatography A. 1562:69-77

A multiple heartcut (MHC) 2D-UHPLC method with UV detection has been developed for the enantioselective analysis of complex amino acid mixtures in a single run. The MHC method is based on an achiral gradient RPLC separation with 1.8 μm C18 phase (10

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67a35d50d30af7e643964b778dd7176e
https://doi.org/10.1016/j.chroma.2018.05.062

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Zwitterionic codeine-derived methacrylate monoliths for enantioselective capillary electrochromatography of chiral acids and chiral bases

Autor: José Manuel Herrero-Martínez, Yubo Ma, Martina Ferri, Wolfgang Lindner, Enrique Javier Carrasco-Correa, Guillermo Ramis-Ramos, Ulrich Woiwode, Michael Lämmerhofer

Publikováno v: ELECTROPHORESIS. 39:2558-2565

Thiol-ene click reaction of N-acetyl-L-cysteine methyl ester to codeine, followed by reaction with allyl isocyanate and hydrolysis to the corresponding zwitterionic chiral selector and its subsequent bonding to the surface of a methacrylate monolith

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af73bb53723f02de7822092484278cc9
https://doi.org/10.1002/elps.201800126

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Surface-anchored counterions on weak chiral anion-exchangers accelerate separations and improve their compatibility for mass-spectrometry-hyphenation

Autor: Orlando L. Sánchez-Muñoz, Ulrich Woiwode, Wolfgang Lindner, Aleksandra Zimmermann, Michael Lämmerhofer, Adrian Sievers-Engler

Publikováno v: Journal of Chromatography A. 1503:21-31

In the present work we propose new variants of chiral stationary phases (CSP) with tert-butylcarbamoylquinine (tBuCQN) as chiral selector molecule. Four tBuCQN-CSPs with distinct bonding chemistries are compared in terms of their pH-dependent surface

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::38d97200cd2c9888053fb144471c7329
https://doi.org/10.1016/j.chroma.2017.04.054

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Evaluation of superficially porous particle based zwitterionic chiral ion exchangers against fully porous particle benchmarks for enantioselective ultra-high performance liquid chromatography

Autor: Christian Geibel, Ulrich Woiwode, Tong Zhang, Kristina Dittrich, Michal Kohout, Michael Lämmerhofer, Wolfgang Lindner

Publikováno v: Journal of chromatography. A. 1603

Zwitterionic chiral ion-exchange selectors (ZWIX) obtained by conjugation of quinine and 2-aminocyclohexanesulfonic acid via a carbamate bond were immobilized on three different silica particle types, viz. 120 A 3 μm fully porous particles (FPP), 20

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::405af3957f693b119a41f61d1842d8f1
https://pubmed.ncbi.nlm.nih.gov/31235330

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Preparation and characterization of poly(3-mercaptopropyl)methylsiloxane functionalized silica particles and their further modification for silver ion chromatography and enantioselective high-performance liquid chromatography

Autor: Xingyu Chen, Marc Wolter, Christian Geibel, Michael Lämmerhofer, Ulrich Woiwode

Publikováno v: Journal of Chromatography A. 1643:462069

The present work reports on the preparation of polythiol-functionalized silica particles by thermally and photo-initiated radical addition reactions using poly(3-mercaptopropyl)methylsiloxane (PMPMS) as sulfhydryl group-rich surface modification reag

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c8a73fb41f99b40a06f091c4fd18e8c3
https://doi.org/10.1016/j.chroma.2021.462069

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Preparation of fluorescent labeled gentamicin as biological tracer and its characterization by liquid chromatography and high resolution mass spectrometry

Autor: Michael Lämmerhofer, Ulrich Woiwode, Adrian Sievers-Engler

Publikováno v: Journal of Pharmaceutical and Biomedical Analysis. 121:307-315

This work deals with the preparation of single-labeled bioconjugates of the antibiotic Gentamicin (GT) with the sulforhodamine-derived fluorescence dye Texas Red(®)-X (TR), its purification by high-performance liquid chromatography (HPLC) and its ch

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8fddbdaf8f9946655af715e0eaa2e8f5
https://doi.org/10.1016/j.jpba.2015.12.053

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Stable-bond polymeric reversed-phase/weak anion-exchange mixed-mode stationary phases obtained by simultaneous functionalization and crosslinking of a poly(3-mercaptopropyl)methylsiloxane-film on vinyl silica via thiol-ene double click reaction

Autor: Jeannie Horak, Ulrich Woiwode, Wolfgang Bicker, Aleksandra Zimmermann, Michael Lämmerhofer, Stefanie Bäurer, Orlando L. Sánchez-Muñoz, Markus Kramer, Wolfgang Lindner

Publikováno v: Journal of chromatography. A. 1593

A polymeric reversed-phase/weak anion exchange (Poly-RP/WAX) mixed-mode stationary phase has been prepared by coating of a poly(3-mercaptopropyl)methylsiloxane film on vinyl-modified silica (100 A, 5 μm) and simultaneous in situ functionalization wi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d6623cead06d45d48795173f77d9d42
https://pubmed.ncbi.nlm.nih.gov/30739756

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Imaging Peptide and Protein Chirality via Amino Acid Analysis by Chiral × Chiral Two-Dimensional Correlation Liquid Chromatography

Autor: Ulrich Woiwode, Michael Lämmerhofer, Wolfgang Lindner, Roland Reischl, Stephan Buckenmaier

Publikováno v: Analytical chemistry. 90(13)

The present contribution illustrates the utilization of a chiral × chiral two-dimensional liquid chromatography (2DLC) setup with tert-butylcarbamoyl quinine chiral stationary phase (CSP) in the first dimension (1D) and tert-butylcarbamoyl quinidine

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a523be84d1c699e4c4e762312d749113
https://pubmed.ncbi.nlm.nih.gov/29871488

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Complementary enantioselectivity profiles of chiral cinchonan carbamate selectors with distinct carbamate residues and their implementation in enantioselective two-dimensional high-performance liquid chromatography of amino acids

Autor: Michael Lämmerhofer, Martina Ferri, Wolfgang Lindner, Ulrich Woiwode, Norbert M. Maier

Publikováno v: Journal of chromatography. A. 1558

A cardinal requirement for effective 2D-HPLC separations is sufficient complementarity in the retention profiles of first and second dimension separations. It is shown that retention and enantioselectivity of chiral selectors derived from cinchona al

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::16420b10f5fe6f2d5c9960421f26f4f3
https://pubmed.ncbi.nlm.nih.gov/29759645

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