Electronic noses: specify or disappear

Mielle, Patrick; Marquis, Florence; Latrasse, C

doi:10.1016/s0925-4005(00)00509-8

Cited by 28 publications

(11 citation statements)

References 4 publications

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“…13 Nevertheless, the inherent disadvantages of e-noses (lack of specificity, instability, lack of repeatability and reproducibility, and consequently poor perenniality of developed databases) were pointed out many times. [14][15][16] Therefore, e-noses hardly meet the requirements in terms of precision, reproducibility, sensitivity, and stability, and they may be used successfully only after recognizing their inherent weaknesses. 14,17,18 After more than two decades of rather intensive research and academic applications (see for example some recent reviews where challenging problems are always mentioned 19,20 ), the e-nose technology is still essentially research laboratory-based with very limited area of routine use or even practical use.…”

Section: Gas Sensor-based Electronic Nosementioning

confidence: 99%

“…[14][15][16] Therefore, e-noses hardly meet the requirements in terms of precision, reproducibility, sensitivity, and stability, and they may be used successfully only after recognizing their inherent weaknesses. 14,17,18 After more than two decades of rather intensive research and academic applications (see for example some recent reviews where challenging problems are always mentioned 19,20 ), the e-nose technology is still essentially research laboratory-based with very limited area of routine use or even practical use. 17,21 Improvements of the technology need developments in the sample handling techniques and in sensors arrays with adaptive profiles.…”

Section: Gas Sensor-based Electronic Nosementioning

confidence: 99%

“…For instance, peach cultivars could be classified and their ripening stage during shelf‐life monitored, mandarin maturity could be followed, and the method was largely investigated for classification of dairy products . Nevertheless, the inherent disadvantages of e‐noses (lack of specificity, instability, lack of repeatability and reproducibility, and consequently poor perenniality of developed databases) were pointed out many times . Therefore, e‐noses hardly meet the requirements in terms of precision, reproducibility, sensitivity, and stability, and they may be used successfully only after recognizing their inherent weaknesses .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Volatile compounds profiling by using proton transfer reaction‐time of flight‐mass spectrometry (PTR‐ToF‐MS). The case study of dark chocolates organoleptic differences

et al. 2019

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Direct‐injection mass spectrometry (DIMS) techniques have evolved into powerful methods to analyse volatile organic compounds (VOCs) without the need of chromatographic separation. Combined to chemometrics, they have been used in many domains to solve sample categorization issues based on volatilome determination. In this paper, different DIMS methods that have largely outperformed conventional electronic noses (e‐noses) in classification tasks are briefly reviewed, with an emphasis on food‐related applications. A particular attention is paid to proton transfer reaction mass spectrometry (PTR‐MS), and many results obtained using the powerful PTR‐time of flight‐MS (PTR‐ToF‐MS) instrument are reviewed. Data analysis and feature selection issues are also summarized and discussed. As a case study, a challenging problem of classification of dark chocolates that has been previously assessed by sensory evaluation in four distinct categories is presented. The VOC profiles of a set of 206 chocolate samples classified in the four sensory categories were analysed by PTR‐ToF‐MS. A supervised multivariate data analysis based on partial least squares regression‐discriminant analysis allowed the construction of a classification model that showed excellent prediction capability: 97% of a test set of 62 samples were correctly predicted in the sensory categories. Tentative identification of ions aided characterisation of chocolate classes. Variable selection using dedicated methods pinpointed some volatile compounds important for the discrimination of the chocolates. Among them, the CovSel method was used for the first time on PTR‐MS data resulting in a selection of 10 features that allowed a good prediction to be achieved. Finally, challenges and future needs in the field are discussed.

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Section: Gas Sensor-based Electronic Nosementioning

confidence: 99%

Section: Gas Sensor-based Electronic Nosementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Volatile compounds profiling by using proton transfer reaction‐time of flight‐mass spectrometry (PTR‐ToF‐MS). The case study of dark chocolates organoleptic differences

et al. 2019

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“…Nevertheless, the term "electronic nose" is being incorrectly used to Grasas y Aceites name different systems, as mass-spectra based system. Other authors use "sensor array technology" (Mielle 2000), "electronic olfactometry" (García et al 2001), "active odour sensing system" (Nakamoto et al 2001) and "artificial olfaction system" (Di , between other synonyms, to refer to a gas sensor system. When an analysis is carried out with an electronic nose, the issues that should be taken into account are: the sampling method, the sensor array and the sensor cleaning.…”

Section: The Electronic Nosementioning

confidence: 99%

Sensors: From biosensors to the electronic nose

García‐González

Aparicio

2002

Grasas y Aceites

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“…8,9 Furthermore, an electronic nose is suitable for nonexpert users and easily applicable to daily life. 10 In traditional biomedical testing, the concentration of ammonia is an important biomarker for the detection of uremia and chronic liver disease. The level of ammonia in the breath of chronic hepatitis patients (0.745 ppm) is significantly greater than that for a normal person (0.278 ppm); 11 patients who have liver failure exhale 4.8-ppm ammonia in their breath.…”

mentioning

confidence: 99%

Detection of Hazardous Vapors Including Mixtures in Varied Conditions Using a Surface-Acoustic-Wave Device

Chiang

Hao

Yang

et al. 2018

ECS J. Solid State Sci. Technol.

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A surface-acoustic-wave (SAW) sensor was used to detect gaseous chemical compounds ammonia, methane and their mixtures in varied environmental conditions. The sensing chamber was improved using top-cover PMMA with 200-μL fluidic channels, compared with a traditional 1-L four-neck bottle. Small concentrations of ammonia (≈ 250 ppb) and methane (≈ 9 ppm) were detectable with this SAW sensor array with a sensing film, PNVP with mesoporous carbon hollow nanospheres. Tests of the stability and repeatability showed that the noise of the frequency change is about ± 12.5 Hz within 410 s; the signal loss is less than 9% after 16 detection cycles. According to the results of the sensing measurements, the frequency shift of the ammonia/methane mixture was equivalent to the sum of the frequency shifts of ammonia and methane. In highly humid conditions the loss of signal of ammonia was much larger than that of methane. Based on the results of quantitative measurements of ammonia/methane gaseous mixtures, we found that the superposition effect between sensing signals for ammonia and methane was useable to predict the signal intensity for ammonia/methane gaseous mixtures at varied relative concentrations. Because of the threat of environmental pollution and its risk to human health, there is a great demand for a gas sensor with high sensitivity, rapid response and a low detection limit that is applicable to a mixture of gases for real-time monitoring. An electronic nose has been widely used in many applications such as for the quality of indoor air, food safety, environmental monitoring and military applications, even in national security issues.1,2 Substantial consideration has been devoted to develop an electronic-nose system in gas sensing of volatile organic compounds without having to identify specific molecular components.3-7 Compared with conventional methods for the analysis of gases, such as use of a gas chromatograph combined with a mass spectrometer (GC-MS) or a (Fourier-transform) infrared spectrometer, an electronic nose has several advantages greatly beneficial for gas detection, including high-throughput sample detection, small size and moderate cost. 8,9 Furthermore, an electronic nose is suitable for nonexpert users and easily applicable to daily life. 10 In traditional biomedical testing, the concentration of ammonia is an important biomarker for the detection of uremia and chronic liver disease. The level of ammonia in the breath of chronic hepatitis patients (0.745 ppm) is significantly greater than that for a normal person (0.278 ppm); 11 patients who have liver failure exhale 4.8-ppm ammonia in their breath. The explosive characteristic of methane is of concern for public safety. In addition, people breathing methane at a high concentration might suffer health problems, resulting in an oxygen deficiency, increased breathing and pulse rates, emotional upset and even death.Many gas-sensing methods include sensor arrays demonstrated with various catalytic metals and chemical compounds, or an opticalfiber gas...

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Electronic noses: specify or disappear

Cited by 28 publications

References 4 publications

Volatile compounds profiling by using proton transfer reaction‐time of flight‐mass spectrometry (PTR‐ToF‐MS). The case study of dark chocolates organoleptic differences

Volatile compounds profiling by using proton transfer reaction‐time of flight‐mass spectrometry (PTR‐ToF‐MS). The case study of dark chocolates organoleptic differences

Sensors: From biosensors to the electronic nose

Detection of Hazardous Vapors Including Mixtures in Varied Conditions Using a Surface-Acoustic-Wave Device

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