An alternative way to improve the sensitivity of electronic olfactometers

Mielle, Patrick; Marquis, Florence

doi:10.1016/s0925-4005(99)00158-6

Cited by 33 publications

(30 citation statements)

References 4 publications

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“…They found that the sensor systems worked well together. Recently, Mielle and Marquis [65] strived to overcome a major drawback of electronic noses, the low signal-to-noise ratio caused by noise and sensor drift. Instead of trying to increase the sensitivity of the individual sensors, they chose to investigate the effects of increasing the rate of sample transfer and changing the mode by which the sample is pumped the sensor.…”

Section: Chemical Sensors For Food Analysismentioning

confidence: 99%

Sensors and Food Quality

Connell

Guilbault

2001

Sensors Update

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Production processes require quality control. The quality of food going to the consumer must always be assured. Traditionally this was performed by taking a sample and sending it to a remote laboratory. While this is successful for most samples, this was not always the case. Having remote laboratories means that there could be a significant lag-time between sampling and results. Some unstable samples may have changed or the source material could have been already used/processed by the time they are analyzed. Sensor-based systems, especially those incorporated within flow injection analyzers, can overcome this problem. As the systems can be small and inexpensive relative to other automated analyzers, they can easily be fitted onsite. With the sensors fitted within the production process, a nearly instant reading can be achieved. The advantages and disadvantages of physical, chemical, and biosensors and their applicability to food analysis are discussed. Particular attention is focused on the improvements made to the underlying technology used in biosensor construction.

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Section: Chemical Sensors For Food Analysismentioning

confidence: 99%

Sensors and Food Quality

Connell

Guilbault

2001

Sensors Update

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“…Nevertheless, an appropriate sample preparation method that increases the concentration of relevant compounds exposed to the sensors, whilst reducing the interference of non-relevant compounds, may help to parallel the electronic nose performance to that of the human nose. For that, also other factors that in¯uence the electronic nose performance, as sample handling, sensor technology and pattern recognition techniques are important, as the system should be considered and improved overall (Mielle and Marquis, 1999;Stetter et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Monitoring the aroma production during wine–must fermentation with an electronic nose

Pinheiro

Rodrigues

Schäfer

et al. 2002

Biotech & Bioengineering

104

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This work discusses the feasibility of using the electronic nose for the on-line and real-time monitoring of the production of a complex aroma profile during a bioconversion process. As a case study, the formation of the muscatel aroma during the wine-must fermentation was selected. During wine-must fermentation, aroma compounds responsible for the organoleptic character are produced in the ppm range, while simultaneously one of the main metabolic products, ethanol, is produced in much higher quantities (up to 10% wt). Because the sensors of the electronic nose array are cross-selective to different volatile compounds, it was investigated in detail how far the electronic nose was able to evaluate the aroma profile along the fermentation. This article discusses and evaluates subsequently the integration of a membrane separation process-organophilic pervaporation-for selectively enriching aroma compounds relative to ethanol, to improve sample discrimination.

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“…Nine type of calixarenes have been involved in our study. They are: tetramethylcalix [4]resorcinarene (CA1), tetrapropylcalix [4]resorcinarene (CA2), tetraformyltetrapropoxycalix [4]arene (CA3), calix [6]arene (CA4), hexamethoxycalix [6]arene (CA5), hexapropoxycalix [6]arene (CA6), tert-butylhexamethoxycalix [6]arene (CA7), tert-butylcalix [8]arene (CA8), diethoxyphosphoryl-calix [8]arene (CA9). Structural formulas of these calixarenes are presented in Fig.…”

Section: Sensitive Layers Deposition Methodsmentioning

confidence: 99%

“…A great attention has been recently paid to creation of effective, miniaturized low-cost smart gas-analytical chemical systems ("electronic noses") that can be utilized for environment monitoring, in food and perfume industry, medicine [1][2][3][4][5][6][7][8][9]. Various physical principles are used in these sensor systems: conductivity change (sensors based on conductive polymers) and optical characteristics (SPR), frequency shift (quartz crystal microbalance (QCM) and SAW) and threshold voltage (gas-FET), etc.-but common main feature of all kind of sensors is the presence of sensitive area where adsorption of gas molecules occurs.…”

Section: Introductionmentioning

confidence: 99%