The GERSTEL OlfactoryDataInterpreter ODI is a powerful software package for the evaluation of combined GC-O data. In addition to visual evaluation, it also offers additional evaluation options based on the commonly used evaluation algorithms. A diverse range of filtering options reduce the quantity of data to be evaluated. One software package is therefore all that you need to meet your data evaluation needs.
Functional principle of ODI
Data recorded using the ODP Recorder and a commonly used GC/MS system are imported into the ODI. The ODI displays the chromatogram, the olfactogram and the sensory impressions of a sample as an overlay. The data have now been visually prepared and can be evaluated. GC/MS data are identified by means of stored MS libraries. The purification of the assigned mass spectra is performed by means of deconvolution algorithms. Additional evaluations, such as calculating the AEDA to determine aroma dilution factors from multiple GC runs can also be performed.
Identification based on GC-O/MS data
The ODI integrates multiple functions for extraction and interpretation of mass spectra. The MS library search function handles library data formats from variety of producers. The GERSTEL Applications Laboratory recommends the NIST-AMDIS Software, integrated with the ODI-Software for fast and accurate compound identification as well as spectral deconvolution of co-eluting compounds.
Aroma Extract Dilution Analysis AEDA
The ODI enables simplified processing of Aroma Extract Dilution Analysis (AEDA) data. The maximum dilution factor, referred to as the Final Dilution factor (FD) at which a substance is still perceptible at the ODP, is stored together with the sensory impression, Retention Index and identification result. The AEDA report can be exported by copy and paste or imported into MS Excel for further processing.
Panel analysis data and detection frequency
If a sample is analyzed by multiple persons, i.e. a sensory panel investigation, existing panel data can be processed using ODI in order to determine the number of panelists who found each individual olfactory impression. The ODI performs this data analysis by mouse-click and delivers the detection frequency of each compound.
The function "Cumulative Olfactogram" quickly and reliably delivers information as to which compounds contribute to the olfactory impression even when present in minute concentrations. This enables the analyst to identify the main odor active compounds in a sample. The sample is analyzed by GC-O in different dilutions to arrive at the result. The ODI adds the determined intensities for the individual dilutions and calculates the cumulative value.
All GC-O data of a sample can be clearly presented and evaluated using a single software package. For evaluation, the ODI makes use of commonly used MS library formats and deconvolution algorithms. Using the optional NIST database, you can maximize the number of spectra that are identified.