Results 21 to 30 of about 1,312 (193)

Columns in analytical‐scale supercritical fluid chromatography: From traditional to unconventional chemistries

Journal of Separation Science, Volume 46, Issue 18, September 2023., 2023
Within this review, we thoroughly explored supercritical fluid chromatography (SFC) columns used across > 3000 papers published from the first study carried out under SFC conditions in 1962 to the end of 2022. We focused on the open tubular capillary, packed capillary, and packed columns, their chemistries, dimensions, and trends in used stationary ...
Kateřina Plachká, Veronika Pilařová, Ondřej Horáček, Taťána Gazárková, Hana Kočová Vlčková, Radim Kučera, Lucie Nováková   +6 more
wiley   +1 more source

Empirical Hydrogen Bonding Donor (HBD) Parameters of Organic Solvents Using Solvatochromic Probes – A Critical Evaluation

ChemPhysChem, Volume 24, Issue 9, May 2, 2023., 2023
The pKa value of the solvatochromic probe in relation to that of the solvent molecule (pKaS) is decisive for whether acid‐base or volumetric effects, with respect to the molar concentration N of the solvent, preferentially determine the empirically measured polarity parameter.
Stefan Spange, Nadine Weiß
wiley   +1 more source

Mining elements of siderophore chirality encoded in microbial genomes

FEBS Letters, Volume 597, Issue 1, Page 134-140, January 2023., 2023
The genome mining tool antiSMASH is leveraged to make de novo structural predictions for a combinatoric suite of triscatechol siderophores framed on an oligo serine ester backbone with the d‐ and l‐cationic amino acids (CAA) Arg, Lys and Orn.
Alison Butler, Aneta M. Jelowicki, Haley A. Ogasawara, Zachary L. Reitz, Parker R. Stow, Emil Thomsen   +5 more
wiley   +1 more source

Targeting a KRAS i‐motif forming sequence by unmodified and gamma‐modified peptide nucleic acid oligomers

Biopolymers, Volume 114, Issue 1, January 2023., 2023
Abstract Growing interest in i‐motif DNA as a transcriptional regulatory element motivates development of synthetic molecules capable of targeting these structures. In this study, we designed unmodified peptide nucleic acid (PNA) and gamma‐modified PNA (γPNA) oligomers complementary to an i‐motif forming sequence derived from the promoter of the KRAS ...
Srijani Sarkar, Gabriela Colón‐Roura, Alexander Pearse, Bruce A. Armitage   +3 more
wiley   +1 more source

Bio‐inspired building blocks for all‐organic metamaterials from visible to near‐infrared

Nanophotonics, Volume 12, Issue 2, Page 307-318, January 2023., 2023
Abstract Light‐harvesting complexes in natural photosynthetic systems, such as those in purple bacteria, consist of photo‐reactive chromophores embedded in densely packed “antenna” systems organized in well‐defined nanostructures. In the case of purple bacteria, the chromophore antennas are composed of natural J‐aggregates such as bacteriochlorophylls ...
Samuel Thomas Holder, Carla Estévez‐Varela, Isabel Pastoriza‐Santos, Martin Lopez‐Garcia, Ruth Oulton, Sara Núñez‐Sánchez   +5 more
wiley   +1 more source

Validation of an SH‐SY5Y Cell–Based Acetylcholinesterase Inhibition Assay for Water Quality Assessment

Environmental Toxicology and Chemistry, Volume 41, Issue 12, Page 3046-3057, December 2022., 2022
Pesticides in the environment can inhibit acetylcholinesterase (AChE). However, natural organic matter such as dissolved organic carbon (DOC) can be co‐extracted from the environmental samples and can interfere with the AChE inhibition assays that use purified enzymes.
Jungeun Lee, Julia Huchthausen, Rita Schlichting, Stefan Scholz, Luise Henneberger, Beate I. Escher   +5 more
wiley   +1 more source

The Global Polarity of Alcoholic Solvents and Water – Importance of the Collectively Acting Factors Density, Refractive Index and Hydrogen Bonding Forces

ChemistryOpen, Volume 11, Issue 10, October 2022., 2022
The density of the hydroxyl groups and the molar concentration primarily determine the global polarity of the alcohols and water. To identify this effect, the polar dissolved Reichardt dye (ET(30) value), the nonpolar xenon atom (129 Xe chemical shift) and the solvolysis of the weakly dipolar 2‐chloro‐2‐methylpropane (lgk1 of solvolysis) are introduced,
Stefan Spange, Nadine Weiß, Thomas G. Mayerhöfer   +2 more
wiley   +1 more source

Identifying organic chemicals not subject to bioaccumulation in air‐breathing organisms using predicted partitioning and biotransformation properties

Integrated Environmental Assessment and Management, Volume 18, Issue 5, Page 1297-1312, September 2022., 2022
Abstract Because the respiration processes contributing to the elimination of organic chemicals deviate between air‐ and water‐breathing organisms, existing and widely used procedures for identifying chemicals not subject to bioaccumulation in aquatic organisms based on the octanol–water partition ratio KOW need to be complemented with similar ...
Frank Wania, Ying Duan Lei, Sivani Baskaran, Alessandro Sangion   +3 more
wiley   +1 more source

Reactive Extraction of Propionic Acid Using Aliquat-336 in 2-Octanol: Linear Solvation Energy Relationship (LSER) Modeling and Kinetics Study [PDF]

, 2010
Reactive extraction is an important recovery method for extraction of propionic acid from dilute streams, providing numerous advantages like high selectivity and recovery.
Uslu, H., Wasewar, K. L., Keshav, A., Chand, S.   +3 more
core   +4 more sources

Contribution of ionic interactions to stationary phase selectivity in hydrophilic interaction chromatography

Journal of Separation Science, Volume 45, Issue 17, Page 3264-3275, September 2022., 2022
We compared the separation selectivities of 19 different hydrophilic interaction chromatography columns. The stationary phases included underivatized silica and hybrid particles, cyano‐bonded silica, materials with neutral ligands such as amide, diol, pentahydroxy, and urea, zwitterionic sorbents, and mixed‐mode materials with amine functionalities.
Martin Gilar, Kenneth D. Berthelette, Thomas H. Walter   +2 more
wiley   +1 more source