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Detection
Electronic Nose
Metal Oxide Sensors
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Electronic Noses detect and measure volatile organic compounds, whether or not they are an odorant. The Electronic Noses from Alpha MOS use various technologies:
- Metal Oxide Sensors: when volatile compounds are adsorbed onto the surface of the semiconductors this generates a change in the electrical resistance which varies with the type of volatile compound and its concentration. As instruments can include up to 18 cross-selective sensors, the range of solid, liquid or gas samples that can be analyzed is broad.
- Fingerprint Mass Spectrometry: sample headspace is analyzed without prior separation of compounds. If needed, molecules can be identified based on the fragments generated.
- Ultra Fast Gas Chromatography: solid, liquid or gas samples can be analyzed by liquid or headspace injection. C20 are analyzed in less than 60 seconds. After a simultaneous injection on 2 short columns of different polarities coupled to 2 Flame Ionization Detectors (FID), the 2 chromatograms are treated as a global fingerprint. A Kovats database is provided, allowing to search chemical compounds in databases of Kovats retention index.
Electronic Tongue
ChemFET Sensors
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The Electronic Tongue developed by Alpha M.O.S. uses sensors based on the ChemFET technology (Chemical modified Field Effect Transistor) for liquid samples analysis. In the presence of dissolved compounds, a potentiometric difference is measured between each of the 7 sensors and the reference electrode. Each sensor has a specific organic membrane, which interacts with ionic, neutral & chemical compounds present in the liquid sample in a specific manner. Any interaction at the membrane interface is detected by the sensor & converted into an electronic signal.
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