In this study, we developed a 2-Step MVM approach, which enables the uniform enrichment of aroma compounds with vapor pressures (VP) <20 kPa in fermented food samples, while eliminating high concentrations of Ethanol as well as water. The 2-Step MVM consists of two different DHS method parameter sets. In the first DHS sampling step at 25ºC, a carbon based dual-bed adsorbent trap (Carbopack B/Carbopack X) is used, which targets volatile compounds with moderate vapor pressure (1-20 kPa). The second DHS sampling step is performed using a Tenax TA trap at 80ºC targeting volatile compounds with low vapor pressure (<1 kPa) and/or hydrophilic characteristics. The performance of the 2-Step MVM was illustrated with analysis of a wide variety of aroma compounds in two different bread samples made with butter or shortening.

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Dynamic Headspace (DHS)

Automated Dynamic Headspace (DHS) is available for the GERSTEL MultiPurpose Sampler (MPS). The DHS station efficiently extracts and concentrates VOCs from liquid or solid sample placed in standard Headspace vials (DHS) or in larger sample containers up to 1 L volume (DHSLarge). The sample is thermostated and agitated while the headspace is purged with a controlled flow of inert gas, providing controlled and efficient extraction conditions. Sample temperatures can be selected from 10oC to 200oC. Lowering the temperature provides a means of reducing the amount of water vapor released and ultimately retrapped. The DHS station additionally holds a replaceable adsorbent- or sorbent filled tube used for analyte concentration. The temperature of the adsorbent tube during the DHS process can be varied from 20oC to 70oC for optimal trapping of the analytes in question.

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Thermal Desorption Unit (TDU 2)

The worlds most flexible Thermal Desoprtion Instrument

The Thermal Desorption Unit (TDU 2) is a flexible automated solution for thermal desorption and thermal extraction. The TDU 2 fits on top of any modern GC without the need for additional bench space and it is perfectly suited for the analysis of gaseous, liquid and solid samples.

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