Concentration and Analysis of Volatile Urinary Metabolites

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Abstract
The headspace concentration of volatile organic metabolites in normal and pathological human urine has been enhanced by the use of a new thermally stable porous polymer. The adsorbent trap becomes an insert for a modified injector port and the sample is heat desorbed and transferred to an open tubular GC column. The adsorbent may be re-used for subsequent analyses once properly conditioned, and aqueous sample storage can be eliminated, as trapped volatiles may be stored and/or shipped to other laboratories in simple containers. Trapped samples stored under various conditions of time, temperature, and container size showed similar profiles. Multiple sampling was made possible by placing several traps in parallel as sulfur compound detection and GC/MS data were required, in addition to flame ionization profiles. Fifty-one compounds have been identified by combined GC/MS.

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