Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume
47, Number 8, September 2009, pp. 670-673
Comparison of Analytical Techniques for Detection
of Geosmin and 2-Methylisoborneol in Aqueous Samples
Barry Hurlburt, Steven W. Lloyd, and Casey C. Grimm
USDA-ARS-SRRC, 1100 Robert E. Lee Blvd., New Orleans, LA 70124
Geosmin and 2-methylisoborneol are secondary metabolites
expressed by a variety of organisms that are responsible for
off-flavors in public water supplies, aquaculture, and a host
of other important products. Hence, there is continuing research
into the causes for their expression and methods to mitigate
it, which require sensitive and accurate detection methods. In
recent years, several new techniques for collecting and concentrating
volatile and semi-volatile compounds have been automated and
commercialized, making them available for use in most laboratories.
In this study, we compared solid-phase microextraction (SPME)
and membrane-assisted solvent extraction (MASE) for the detection
of 2-methylisoborneol and geosmin in aqueous samples. SPME is
the most sensitive of these techniques with a limit of detection
of 25 parts-per-trillion for 2-methylisoborneol and 10 parts-per-trillion
for geosmin but with a large relative standard deviation. MASE
is less sensitive, but provides a greater level of precision,
as well as the ability for multiple injections from the same
sample.
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