Yan, Bing published the artcileStructure-Dependent Response of a Chemiluminescence Nitrogen Detector for Organic Compounds with Adjacent Nitrogen Atoms Connected by a Single Bond, Safety of 1-(4-Fluorophenyl)-5-methyl-1H-pyrazole-4-carboxylic acid, the main research area is HPLC chemiluminescence nitrogen detector structure dependent response; single bond connected adjacent nitrogen atom organic compound detector; pyrazole hydrazine triazole derivative HPLC chemiluminescence nitrogen detector; high throughput screening pyrazole hydrazine triazole derivative chemiluminescence detector.
High-throughput screening (HTS) of chem. libraries is indispensable for drug discovery research. However, the HTS data quality for lead discovery, lead optimization, and quant. structure activity relation studies was severely compromised due to the uncertain compound concentrations in screening plates. To address this issue, the authors compared various high-throughput technologies for quantification of compounds in microtiter plate format without the need for authentic compounds as standards and identified the chemiluminescence nitrogen detector (CLND) as the method of choice at the present time. However, the structure dependence of this detector was not well studied. A proposed rule suggested that the only exception to equimolar response is for compounds that contain adjacent nitrogen atoms. The response should be zero when the adjacent nitrogen atoms are connected by a double bond and 0.5 when they are connected by a single bond. The authors studied a broad range of compounds with isolated and adjacent nitrogen atoms. Compounds with isolated nitrogen atoms produce an equimolar response with a 15-20% variation depending on structures and compounds with adjacent nitrogen atoms connected by a double bond giving nearly zero response. The CLND response for compounds containing adjacent nitrogen atoms that are connected with a single bond is highly structure dependent. Substitutions on the nitrogen atoms or nearby in the mol. can increase the CLND response to approach a value higher than the predicted value 0.5 (maximal value 0.82/nitrogen atom). Without substitution, much lower values than predicted (minimal value 0.0-0.08/nitrogen atom) were obtained. Therefore, the prediction of response of 0.5/nitrogen atom for compounds with adjacent nitrogen atoms connected by a single bond should be abandoned. Compounds with similar structures should be used to generate calibration curves for quantification of this class of compounds
Analytical Chemistry published new progress about Chemiluminescence. 217073-76-2 belongs to class pyrazoles-derivatives, name is 1-(4-Fluorophenyl)-5-methyl-1H-pyrazole-4-carboxylic acid, and the molecular formula is C11H9FN2O2, Safety of 1-(4-Fluorophenyl)-5-methyl-1H-pyrazole-4-carboxylic acid.
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics