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Arsenic speciation in human urine: are we all the same?
Vivian W-M Lai1, Yongmei Sun, Eon Ting
1Environmental Chemistry Group, Department of Chemistry, University of British Columbia, Vancouver, BC, Canada V6T 1Z1.
Toxicology and Applied Pharmacology
|July 28, 2004
Summary
This study analyzed arsenic speciation in urine after eating mussels, finding arsenobetaine and DMAA as major metabolites. Individual arsenic excretion patterns varied, highlighting the need for better understanding of human arsenic metabolism.
Area of Science:
- Environmental Chemistry
- Human Metabolism
- Analytical Chemistry
Background:
- Arsenic exposure from seafood is a public health concern.
- Understanding arsenic metabolism is crucial for assessing health risks.
- Seafood, like blue mussels (Mytilus edulis), contains various arsenic compounds.
Purpose of the Study:
- To investigate arsenic speciation in human urine after consuming blue mussels.
- To determine the major arsenic metabolites and their excretion patterns.
- To assess the impact of cooking on arsenic speciation in urine.
Main Methods:
- High-performance liquid chromatography-inductively coupled plasma-mass spectrometry (HPLC-ICP-MS) was used for arsenic speciation analysis.
- Urine samples were collected from nine volunteers over a 3-day period post-mussel consumption.
- Analysis focused on identifying and quantifying different arsenic metabolites.
Main Results:
- Arsenobetaine and dimethylarsinic acid (DMAA) were identified as the primary arsenic metabolites in urine.
- Significant levels of unidentified arsenic metabolites were also detected.
- Individual arsenic excretion profiles showed variability, with two subjects exhibiting unusual patterns.
Conclusions:
- Human metabolism of arsenic compounds, particularly from seafood, requires further investigation.
- The presence of unknown metabolites suggests complex metabolic pathways.
- Variations in excretion highlight the need for personalized risk assessment for arsenic exposure.