Results 21 to 30 of about 1,553,597 (362)

Retention Time Prediction for Chromatographic Enantioseparation by Quantile Geometry-enhanced Graph Neural Network [PDF]

, 2022
A new research framework is proposed to incorporate machine learning techniques into the field of experimental chemistry to facilitate chromatographic enantioseparation. A documentary dataset of chiral molecular retention times (CMRT dataset) in high-performance liquid chromatography is established to handle the challenge of data acquisition.
arxiv   +1 more source

Rapid Characterization and Identification of Flavonoids in Radix Astragali by Ultra-High-Pressure Liquid Chromatography Coupled with Linear Ion Trap-Orbitrap Mass Spectrometry.

Journal of Chromatographic Science, 2015
A simple and effective method was established for separation and characterization of flavonoid constituents in Radix Astragali (RA) by combination of ultra-high-pressure liquid chromatography with LTQ-Orbitrap tandem mass spectrometry (u-HPLC-LTQ ...
Jing Zhang, Xiao-jie Xu, Wen Xu, Juan Huang, Da-yuan Zhu, Xiao-hui Qiu   +5 more
semanticscholar   +1 more source

Bacterial Cell Wall Precursor Phosphatase Assays Using Thin-layer Chromatography (TLC) and High Pressure Liquid Chromatography (HPLC)

Bio-Protocol, 2018
Peptidoglycan encases the bacterial cytoplasmic membrane to protect the cell from lysis due to the turgor. The final steps of peptidoglycan synthesis require a membrane-anchored substrate called lipid II, in which the peptidoglycan subunit is linked to ...
Manuel Pazos, Christian Otten, Waldemar Vollmer   +2 more
doaj   +1 more source

STRUCTURE OF METHYLPHEOPHORBIDE-RCI [PDF]

, 1986
he methanolic extract of the cyanobacterium (blue-green alga) Spirulina geitleri has been treated with methanolic acid to convert all chlorophyllous pigments to their methylpheophorbides.
Budzikiewicz H., Dismukes G. C., Dornemann D., Dornemann D., Dornemann D., Feher G., Fischer H., Fuhrhop J.H., Harrison J. E., Hynninen P. H., Hynninen P. H., Klimov V. V., Knaff D. B., Moore R. E., Norris J.R., O'Malley P. J., Schaffernicht H., Schatz G. H., Scheer H., Scheer H., Senger H., Svec W. A., Thomas J. A., Vacek K., Vierling E., Wasielewski M., Wu S.M., Yuasa M.   +27 more
core   +1 more source

High pressure liquid chromatography of benzimidazolcs

Pesticide Science, 1976
AbstractA laboratory‐assembled high pressure liquid chromatograph with variable wavelength ultraviolet detector is described. The chromatography of the systemic fungicides benomyl, thiabendazole, thiophanate, related fungicides and benzimidazoles (13 compounds in all) is described using reverse phase and adsorption systems.
Austin, D. J., Lord, K. A., Williams, I. H.   +2 more
openaire   +2 more sources

Validation of a chromatographic method to routine analysis of trans-resveratrol and quercetin in red wines [PDF]

Pesquisa Agropecuária Brasileira, 2017
: The objective of this work was to validate a fast method with low-solvent use, for the analysis of trans-resveratrol and quercetin in red wines. The wines were prepared, using a classical method, from the grape (Vitis vinifera) cultivars Cabernet Franc,
Letícia Flores da Silva, Celito Crivellaro Guerra, Ana Beatriz Costa Czermainski, Leonardo Ferrari, Ana Maria Bergold   +4 more
doaj   +1 more source

Reliable LC-MS/MS-based method for trace level determination of 50 medium to highly polar pesticide residues in sediments and ecological risk assessment [PDF]

Anal Bioanal Chem. 2019 Dec;411(30):7981-7996, 2020
The occurrence of polar pesticides in sediments has not been extensively investigated because of their relatively poor hydrophobicity and apparently less persistence in the environment. However, their continuous release into the aquatic systems calls for the evaluation of their potential accumulation in sediments and the role of this matrix as a ...
arxiv   +1 more source

Enricher for Fraction of High-Pressure Liquid Chromatography [PDF]

Journal of Chromatographic Science, 2005
A device is developed for concentrating a dilute solution without losing the components with boiling points slightly higher than the solvent. The device consists of an evaporator, receptor, and approximately 100 capillaries. A dilute solution is introduced into the evaporator and heated at a lower temperature than the boiling point of the solvent with ...
Masayuki Matsui, Tadao Ogawa, Takanori Mizuno   +2 more
openaire   +3 more sources

Analysis of total urinary catecholamines by liquid chromatography: methodology, routine experience and clinical interpretations of results [PDF]

, 1983
A simple routine method is described for simultaneous assay of total urinary adrenaline, noradrenaline and dopamine. The catecholamines are pre-purified on a small ion-exchange column, separated by reversed phase ion-pair liquid chromatography, and are ...
Kees, Frieder K., Schleicher, E. D., Wieland, O. H.   +2 more
core   +1 more source

Glutathione conjugates of the mercapturic acid pathway and guanine adduct as biomarkers of exposure to CEES, a sulfur mustard analog [PDF]

, 2021
Sulfur mustard (SM), a chemical warfare agent, is a strong alkylating compound that readily reacts with numerous biomolecules. The goal of the present work was to define and validate new biomarkers of exposure to SM that could be easily accessible in urine or plasma. Because investigations using SM are prohibited by the Organization for the Prohibition
arxiv   +1 more source