Comparative yields of mutagens from cigarette smokers' urine obtained by using solid-phase extraction techniques

Area of Science:

• Environmental Health
• Toxicology
• Analytical Chemistry

Background:

• Cigarette smoking generates numerous mutagens and carcinogens.
• Urinary analysis is crucial for assessing exposure and biological effects of smoking.
• Efficient extraction of urinary mutagens is essential for accurate toxicological testing.

Purpose of the Study:

• To compare the efficacy of different solid-phase extraction adsorbents for concentrating mutagens in smoker's urine.
• To evaluate the mutagenic activity of recovered urinary metabolites.
• To identify the optimal extraction method for subsequent toxicological studies.

Main Methods:

• Urine samples from cigarette smokers were subjected to solid-phase extraction using octadecyl, cyclohexyl, and cyanopropyl bonded silica columns.
• Recovered urinary metabolites were assessed for mutagenic activity using a Salmonella typhimurium microreversion assay.
• The influence of urine pH on mutagen recovery was investigated.

Main Results:

• All tested adsorbents recovered mutagens from urine.
• Cyanopropyl bonded silica columns demonstrated superior performance, yielding higher bioactivity and reduced toxicity.
• Urine pH significantly impacted mutagen recovery, particularly in basified samples, when using cyanopropyl adsorbents.
• Combined adsorbents did not significantly improve recovery compared to single adsorbents.

Conclusions:

• Cyanopropyl bonded silica columns are the preferred method for extracting and concentrating mutagens from cigarette smoker's urine.
• Optimizing urine pH can enhance mutagen recovery efficiency.
• Single adsorbent extraction is sufficient and cost-effective for this application.