Abstract
Hydrogen peroxide (H2O2) can be detected in freshly-voided human urine from healthy subjects and has been proposed as a “biomarker” of oxidative stress. This paper summarizes our studies to examine the extent to which urinary H2O2 measurement fulfils the criteria for the “ideal biomarker”. Levels of H2O2, standardised for creatinine, varied widely between subjects. In most subjects, levels also varied considerably when measurements were made at different times and on different days. A reproducible increase in urinary H2O2 was detected in all subjects examined after drinking coffee, a beverage rich in H2O2. By contrast, green tea decreased urinary H2O2 levels. We conclude that the H2O2 in coffee is not excreted into urine. Instead, hydroxyhydroquinone from coffee is absorbed, excreted and oxidises in urine to produce H2O2. No other confounders of urinary H2O2 have been identified to date. Work is underway to compare H2O2 levels with variations in other biomarkers of oxidative damage, to test the possibility that there are daily or other periodic variations in oxidative damage rates.
Keywords: urine, hydrogen peroxide, oxidative damage, coffee, superoxide, flavonoid, hydroxyhydroquinone, ascorbate
Current Medicinal Chemistry
Title: Establishing Biomarkers of Oxidative Stress: The Measurement of Hydrogen Peroxide in Human Urine
Volume: 11 Issue: 9
Author(s): Barry Halliwell, Lee Hua Long, Tsin Pinn Yee, Sharon Lim and Ronan Kelly
Affiliation:
Keywords: urine, hydrogen peroxide, oxidative damage, coffee, superoxide, flavonoid, hydroxyhydroquinone, ascorbate
Abstract: Hydrogen peroxide (H2O2) can be detected in freshly-voided human urine from healthy subjects and has been proposed as a “biomarker” of oxidative stress. This paper summarizes our studies to examine the extent to which urinary H2O2 measurement fulfils the criteria for the “ideal biomarker”. Levels of H2O2, standardised for creatinine, varied widely between subjects. In most subjects, levels also varied considerably when measurements were made at different times and on different days. A reproducible increase in urinary H2O2 was detected in all subjects examined after drinking coffee, a beverage rich in H2O2. By contrast, green tea decreased urinary H2O2 levels. We conclude that the H2O2 in coffee is not excreted into urine. Instead, hydroxyhydroquinone from coffee is absorbed, excreted and oxidises in urine to produce H2O2. No other confounders of urinary H2O2 have been identified to date. Work is underway to compare H2O2 levels with variations in other biomarkers of oxidative damage, to test the possibility that there are daily or other periodic variations in oxidative damage rates.
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Cite this article as:
Halliwell Barry, Long Hua Lee, Yee Pinn Tsin, Lim Sharon and Kelly Ronan, Establishing Biomarkers of Oxidative Stress: The Measurement of Hydrogen Peroxide in Human Urine, Current Medicinal Chemistry 2004; 11 (9) . https://dx.doi.org/10.2174/0929867043365404
DOI https://dx.doi.org/10.2174/0929867043365404 |
Print ISSN 0929-8673 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-533X |
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