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Techniques & Tools Mass Spectrometry, Gas Chromatography

Surprising Samples

Scent of Cerumen

Submitted by Katharine Prigge, Monell Center, USA

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Photo credit: Chelsea Lewis

Earwax – or cerumen – comprises secretions from specialized sweat glands and fatty materials produced by sebaceous glands. Until now, it has been a little-studied human secretion. We analyzed, for the first time, the volatile organic chemicals in earwax using gas chromatography-mass spectrometry. Differences were detected in the earwax of East Asians and Caucasians, suggesting that earwax is an untapped source of personal information.

Soil on Mars

Submitted by Samuel Kounaves, Tufts University, USA

The first sample of martian soil that the Phoenix Mars lander analyzed in 2008 contained almost 1 percent perchlorate. This unexpected finding has changed the analysis of Mars soil and has wider implications for organics, past and extant life, human exploration, and habitability.

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Photo credit: NASA/JPL/University of Arizona/Texas A&M University

Germ Welfare

Submitted by the Desert Research Institute (DRI), USA

During Desert Research Institute’s (DRI) Lake Vida project, a temporary camp was erected for one month in McMurdo Dry Valleys of East Antarctica to support scientific efforts to study the lake’s ice, brine and underlying sedimentary layers. In November of 2012, a pioneering study co-authored by DRI’s Alison Murray and Christian Fritsen revealed, for the first time, a viable community of bacteria that survives in a dark, salty and subfreezing environment beneath nearly 20 meters of ice.

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Photo credit: Emanuele Kuhn, Desert Research Institute

Inside Amber

Submitted by Jennifer Poulin and Stephanie Vuicic, Government of Canada, Canadian Conservation Institute

Characterization of Canadian amber has revealed the structural role of succinic acid. Fragments of the amber polymers were broken away with their succinyl cross-linkages intact. The work was performed using a novel method of pyrolysis-gas chromatography-mass spectrometry.

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Photo credit: Government of Canada, Canadian Conservation Institute, CCI 123773-0025

 

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