Factors and Trends Affecting the Identification of a Reliable Biomarker for Diesel Exhaust Exposure

David A Morgott, David A Morgott

Abstract

The monitoring of human exposures to diesel exhaust continues to be a vexing problem for specialists seeking information on the potential health effects of this ubiquitous combustion product. Exposure biomarkers have yielded a potential solution to this problem by providing a direct measure of an individual's contact with key components in the exhaust stream. Spurred by the advent of new, highly sensitive, analytical methods capable of detecting substances at very low levels, there have been numerous attempts at identifying a stable and specific biomarker. Despite these new techniques, there is currently no foolproof method for unambiguously separating diesel exhaust exposures from those arising from other combustion sources. Diesel exhaust is a highly complex mixture of solid, liquid, and gaseous components whose exact composition can be affected by many variables, including engine technology, fuel composition, operating conditions, and photochemical aging. These factors together with those related to exposure methodology, epidemiological necessity, and regulatory reform can have a decided impact on the success or failure of future research aimed at identifying a suitable biomarker of exposure. The objective of this review is to examine existing information on exposure biomarkers for diesel exhaust and to identify those factors and trends that have had an impact on the successful identification of metrics for both occupational and community settings. The information will provide interested parties with a template for more thoroughly understanding those factors affecting diesel exhaust emissions and for identifying those substances and research approaches holding the greatest promise for future success.

Keywords: adducts; biodiesel; carbonyls; elemental carbon; exhaust emissions; metabolism; pharmacokinetics; photochemical aging; polycyclics; quinones.

Figures

FIGURE 1.
FIGURE 1.
Exposure-response continuum showing the stages targeted by biomarker development (Manini et al., 2007). © Elsevier. Reproduced by permission of Elsevier. Permission to reuse must be obtained from the rightsholder.
FIGURE 2.
FIGURE 2.
Hypothetical kinetic relationships between different biomarkers of exposure (Henderson et al., 1989).

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Source: PubMed

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