Chromatographic determination method for 1-nitropyrene and its metabolites in biological samples with fluorescence detection after on-line reduction

Development of analytical methods for polycyclic aromatic hydrocarbons (PAHs) in airborne particulates: a review

In the present work, the different sample collection, pretreatment and analytical methods for polycyclic aromatic hydrocarbons (PAHs) in airborne particulates is systematacially reviewed, and the applications of these pretreatment and analytical methods for PAHs are compared in detail. Some comments on the future expectation are also presented.

Association interaction and voltammetric determination of 1-aminopyrene and 1-hydroxypyrene at cyclodextrin and DNA based electrochemical sensors

The aim of this work was voltammetric determination of 1-aminopyrene and 1-hydroxypyrene using carbon paste electrodes modified with cyclodextrin derivatives and double stranded deoxyribonucleic acid (dsDNA). The detection schemes based on a preconcentration and differential pulse voltammetric (DPV) determination at beta-cyclodextrin and gamma-cyclodextrin modified carbon paste electrode (beta-CD/CPE, gamma-CD/CPE), neutral beta-cyclodextrin polymer and carboxymethyl-beta-cyclodextrin polymer modified screen-printed electrode (beta-CDP/SPE, beta-CDPA/SPE) and dsDNA modified screen-printed electrode (DNA/SPE) are proposed for the trace determination of studied analytes within the concentration range from 2 x 10(-8) to 4 x 10(-7) mol dm(-3) and from 2 x 10(-7) to 4 x 10(-6) mol dm(-3) with the limits of quantification down to 10(-8) mol dm(-3). Depending on pH, 1-aminopyrene interacts with both surface attached CD and DNA by electrostatic bonds and supramolecular complexation while 1-hydroxypyrene associates with the CD hosts via complexation. The 1-aminopyrene interaction with dsDNA was confirmed by fluorimetric measurements in the solution phase using a competing DNA-TO-PRO-3 dye complex. In addition, the effect of temperature on this association was investigated using an electrically heated DNA-modified carbon paste electrode (DNA/CPE).

Chromatographic methods for carcinogenic/mutagenic nitropolycyclic aromatic hydrocarbons

Nitropolycyclic aromatic hydrocarbons (NPAHs), which are known to be carcinogenic and/or mutagenic, are considered to be one of the air pollutants that cause lung cancer. In the last two decades, a number of sensitive and selective methods have been developed for the determination of NPAHs and related compounds in environmental and biological samples. This paper describes the state of the art of the methods and applications.

An on-line reduction HPLC/chemiluminescence detection system for nitropolycyclic aromatic hydrocarbons and metabolites

Various metal powders were batch screened as possible on-line reducers for nitropolycyclic aromatic hydrocarbons (NPAHs), in particular 1,3-dinitropyrene (1,3-DNP, 1,8-DNP and 1-nitropyrene (1-NP) and it metabolites. Zinc was found to be an excellent reducer in chemiluminescent compatible mobile phases without any associated disposal problems. Zinc reducer column parameters, namely pH, buffer concentration, packing composition (zinc:glass beads or zinc:silica gel) and column length were all optimized for the HPLC determination system with chemiluminescence detection, named NPAH analyser. The system consisted of three pumps, sample injector, reducer column packed with zinc:glass beads switching valve with a cutting loop, separation column (ODS), chemiluminescence detector and integrator. The mobile phase for the separation column and chemiluminescence reagent solution were respectively acetonitrile:imidazole-HClO44 and acetonitrile containing bis(2,4,6-trichlorophenyl)oxalate and H2O2. When the reducer column was introduced before the separation column, 1,3-, 1,6- 1,8-DNPs and 1-NP in benzene:ethanol extracts from airborne particulates were separately determined with detection limits of 2-50 fmol, respectively, in a 100 microL sample. When the reducer column was introduced just after the separation column, 1-NP, 1-nitrosopyrene and 1-aminopyrene in the incubation mixture of 1-NP and the Salmonella typhimurium YG1021 strain were separately determined with detection limits as low as sub fmol levels. 1,8-DNP and its metabolite were also separately determined in the incubation mixture of 1,8-DNP and the S. typhimurium TA98 strain.