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High resolution rotational Terahertz (THz) spectroscopy has been widelyapplied to the studies of numerous polar gas phase molecules, in particularvolatile organic compounds (VOCs). During the storage of foodstuffs packedunder a protective atmosphere, microbial activity will lead to the generationof a complex mixture of trace gases that could be used as food spoilageindicators. Here we have demonstrated that the THz instrumentation presentlyavailable provides sufficient sensitivity and selectivity to monitor thegeneration of hydrogen sulfide (H2S) in the headspace of packed Atlantic salmon(Salmo salar) fillet portions. A comprehensive comparison was made byselective-ion flow-tube mass spectrometry (SIFT-MS) in order to validate theTHz measurements and protocol. The detectivity of a range of alternativecompounds for this application is also provided, based on the experimentaldetection limit observed and molecular spectroscopic properties. Molecules likeethanol, methyl mercaptan and ammonia are suitable indicators with thepresently available sensitivity levels, while dimethyl sulfide, acetone andbutanone may be considered with a sensitivity improvement of 2 orders ofmagnitude.

Monitoring of food spoilage by high resolution THz analysis