GC/MS Off-Flavor Analyzer
Analytical System for Reliably Identifying Odor-Causing Substances
Process Flow Using the GC-MS Off-Flavor Analyzer
Three Different Types of Columns Can Be Selected for Detecting a Wide Variety of Components with High Sensitivity.
Three types of stationary liquid-phase columns are included, so that the optimum column can be selected based on the physical properties of the target components. A handbook provided with the system lists the detection limit for each registered component using the respective columns, which makes it easy to determine which column should be selected.
Example: Comparison of peak shapes obtained using columns with slight versus high polarity
Mass Chromatograms of Isovaleric Acid
(Left: Inert Cap 5Sil/MS, Right: Inert Cap Pure-WAX)
Using the slightly polar column to analyze highly acidic components, such as isovaleric acid, causes peak tailing, whereas using the highly polar column improves the peak shape, which enables measuring the component with high sensitivity.
InertCapTM 5MS/Sil (30 m, 0.32 mm I.D., df = 0.5 μm)
InertCapTM 17MS (30 m, 0.25 mm I.D., df = 0.25 μm)
InertCapTM Pure-WAX (30 m, 0.25 mm I.D., df = 0.25 μm)
Note: InertCap is a registered trademark of GL Sciences Inc.
MRM and SIM Analysis Can Detect Odor Threshold Concentration Levels.
Since some odor components have a low odor threshold, low concentration levels need to be detected to identify the causative substances. High-sensitivity MRM/SIM analysis by GC-MS(/MS) can reliably detect even trace components near the odor threshold (a few pg/g).
Mass Chromatograms of 2,4,6-Trichloroanisole (estimated concentration of 18.166 pg/g) in Food with an Odd Odor (Left: Scan analysis, Right: MRM analysis)
Odors Can Be Confirmed Efficiently Using Predicted Retention Time Display Function.
On systems with a sniffer unit, odor components identified from the database can be confirmed. The system includes a function that displays estimated retention times for detected components, so that they can be confirmed based on time.