Selective Ultra-Trace-Analysis
Selective Ultra-Trace-Analysis

Selective Ultra-Trace-Headspace Analysis of Volatiles using ITEX - FLAVOURSPEC®

Separating complex matrices by GC enables optimal use of the sensitivity of IMS which w.r.t. (off-) flavour inducing compounds is of high interest in food and flavour related applications. Combining this unique set-up with distinguished enrichment properties of thermal desorption by ITEX (In-tube Extraction) DHS (Dynamic Headspace) lead to a benchmark in the field of trace analysis where very lowest (sub ppb) detection limits and enhanced separation characteristics are required.

Selective Ultra Trace Headspace Analysis

Selective Ultra Trace Headspace Analysis:

  • General enrichment of volatile organic compounds in order to gain sensitivity
  • Selective enrichment/controlled depletion of compounds (in order to dispose undesired or perturbing matrix compounds)
  • Highly sensitive detection of green tea fingerprints based on highly volatile and semi-volatile components
  • Alcoholic beverages: Whisky, Wine, Liquors (aging, quality control, flavour analysis, e.g.)
  • Detection of TMA in fish or shrimps
  • Sensitive detection of Geosmin
  • Detection of different ketones in food stuff

 

 

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Analysis of flavors, pesticides, and biomarkers directly from complex food matrix using the automated Vacuum In-Tube Extraction (V-ITEX)
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Analysis of flavors, pesticides, and biomarkers directly from complex food matrix using the automated Vacuum In-Tube Extraction (V-ITEX)

Extraction of volatile compounds is a widely used approach for analysis of foods and beverages.  By the nature of gas phase sampling, the limiting factor for polar analytes are given by low vapor pressure or higher boiling points of semi-volatile compounds. These limitations can be overcome by sampling at decreased pressure levels using vacuum conditions. This has been shown in several publications using vacuum sampling techniques. In this study, a fully automated approach of Vacuum In-Tube Extraction (V-ITEX) is presented, a simple and fully automated technique using PAL system autosamplers. The application examples include flavors, fragrances, off-flavors, pesticides and biomarkers by extractions directly from the food sample matrix, such as Honey, Bee Wax, Cheese, Onions, Blood and Urine.  

Presented by:

Pascal Fuchsmann, Head of Flavor Analytics Agroscope

Stefan Cretnik, Product Manager CTC Analytics AG

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Demonstration of a routine analytical method for the quantitation of volatile organic compounds in drinking water, using the
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The automated ITEX Dynamic Headspace unit demonstrated equivalent accuracy and precision when compared to purge and trap and overall was more sensitive than the other enrichment techniques. The ITEX unit allows for automated analysis and optimization of conditions which drastically reduces analyst’s time when compared to performing the experiments manually with the purge and trap without any reduction in sensitivity, accuracy and reproducibility.

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The analysis of volatile organic compounds (VOCs) is a faster approach to identify the honey’s origin than traditional methods, which is important for the quality control of honeys. In-tube extraction dynamic headspace (ITEX-DHS) is a fully automated microextraction technique, in which the enrichment of analytes takes place by repeated aspiring and dispensing of the sample headspace through a sorbent trap

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