Measurements of Oxidative Potential of Particulate Matter at Belgrade Tunnel; Comparison of BPEAnit, DTT and DCFH Assays

Overview

Journal Int J Environ Res Public Health

Publisher MDPI

Specialties Environmental Health
Public Health

Date 2019 Dec 11

PMID 31817307

Citations 3

Authors

Maja V Jovanovic

Jasmina Z Savic

Farhad Salimi

Svetlana Stevanovic

Reece A Brown

Milena Jovasevic-Stojanovic

Dragan Manojlovic

Alena Bartonova

Steven Bottle

Zoran D Ristovski

Affiliations

Soon will be listed here.

Abstract

To estimate the oxidative potential (OP) of particulate matter (PM), two commonly used cell-free, molecular probes were applied: dithiothreitol (DTT) and dichloro-dihydro-fluorescein diacetate (DCFH-DA), and their performance was compared with 9,10-bis (phenylethynyl) anthracene-nitroxide (BPEAnit). To the best of our knowledge, this is the first study in which the performance of the DTT and DCFH has been compared with the BPEAnit probe. The average concentrations of PM, organic carbon (OC) and elemental carbon (EC) for fine (PM) and coarse (PM) particles were determined. The results were 44.8 ± 13.7, 9.8 ± 5.1 and 9.3 ± 4.8 µg·m for PM and 75.5 ± 25.1, 16.3 ± 8.7 and 11.8 ± 5.3 µg·m for PM, respectively, for PM, OC and EC. The water-soluble organic carbon (WSOC) fraction accounted for 42 ± 14% and 28 ± 9% of organic carbon in PM and PM, respectively. The average volume normalized OP values for the three assays depended on both the sampling periods and the PM fractions. The OP had its peak at 2 p.m.; in the afternoon, it was three times higher compared to the morning and late afternoon values. The DCFH and BPEAnit results were correlated ( = 0.64), while there was no good agreement between the BPEAnit and the DTT ( = 0.14). The total organic content of PM does not necessarily represent oxidative capacity and it shows varying correlation with the OP. With respect to the two PM fractions studied, the OP was mostly associated with smaller particles.

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