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Trans-3'-hydroxycotinine--a main metabolite in smokers
G B Neurath1, M Dünger, O Krenz
1Institut für Biopharmazeutische Mikroanalytik, Hamburg.
Klinische Wochenschrift
|January 1, 1988
Summary
Trans-3'-hydroxycotinine is the most abundant nicotine metabolite in smokers. This study details its prevalence and excretion rates after administration.
Area of Science:
- Pharmacology
- Metabolism Studies
- Tobacco Research
Background:
- Nicotine metabolism is crucial for understanding smoking behavior and health effects.
- Trans-3 ahydroxycotinine (3HC) is identified as a significant nicotine metabolite in smokers.
Purpose of the Study:
- To investigate the abundance and pharmacokinetic profile of trans-3 ahydroxycotinine in habitual smokers.
- To determine the excretion rates of unchanged trans-3 ahydroxycotinine after oral administration.
Main Methods:
- Habitual smokers (n=9) smoked 19 cigarettes/day for 7 days.
- Blood plasma concentrations of trans-3 ahydroxycotinine were measured.
- Oral administration of 30 mg trans-3 ahydroxycotinine to two subjects.
Main Results:
- Trans-3 ahydroxycotinine is the most abundant nicotine metabolite over a 12-day period (7 smoking, 5 non-smoking days).
- Steady-state plasma concentration of trans-3 ahydroxycotinine is second only to cotinine by day 6 of smoking.
- Cumulative excretion rates of unchanged trans-3 ahydroxycotinine were 81% and 93% in two subjects.
Conclusions:
- Trans-3 ahydroxycotinine is a major and abundant metabolite of nicotine in humans.
- The high excretion rate suggests limited further metabolism of trans-3 ahydroxycotinine.
- Findings contribute to understanding nicotine's metabolic pathways and biomarker development.