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Electronic AND nose

Paul Brinkman, Anke-Hilse Maitland-van der Zee, Ariane H Wagener
PURPOSE OF REVIEW: The long-term management goals of the inflammatory airway diseases asthma and chronic obstructive pulmonary disease (COPD) are similar and focus on symptom control and reduction of exacerbation frequency and severity. Treatable traits have recently been postulated as a management concept which complements the traditional diagnostic labels 'asthma' and 'COPD', thereby focusing on therapy targeted to a patients' individual disease-associated characteristics. Exhaled volatile organic compounds (VOCs) may be utilized as noninvasive biomarker for disease activity or manifestation in asthma and COPD...
October 15, 2018: Current Opinion in Pulmonary Medicine
Junjun Fan, Wangxiang Zhang, Ting Zhou, Dandan Zhang, Donglin Zhang, Long Zhang, Guibin Wang, Fuliang Cao
Floral scent is important in plant reproduction and also has aesthetic implications. However, the accurate determination of aroma is presently limited by the available collection and analysis tools. In this study, the floral scents of four crabapple taxa exhibiting faint, weak, clear, and strong scent intensities were comparatively analyzed by electronic nose (E-nose) and gas chromatography⁻mass spectrometry (GC⁻MS). The E-nose was able to effectively group the different taxa in the principal component analysis in correspondence with scent intensity...
October 12, 2018: Sensors
Alisa Rudnitskaya
One of the obstacles to the wider practical use of the multisensor systems for gas and liquid analysis-electronic noses and tongues, is the limited temporal validity of the multivariate calibration models. Frequent recalibration of multisensor systems is often excessively costly and time consuming due to the large number of necessary reference sample and their limited availability. There are several circumstances that can invalidate multivariate calibration model. The most common problem in the case of sensor systems is temporarily drift or gradual change of sensor characteristics occurring during sensor exploitation...
2018: Frontiers in Chemistry
Wenjiang Dong, Rongsuo Hu, Yuzhou Long, Hehe Li, Yanjun Zhang, Kexue Zhu, Zhong Chu
In this study, room-temperature drying, solar drying, heat pump drying (HPD), hot-air drying, and freeze drying were applied to investigate the volatile profiles and taste properties of roasted coffee beans by using electronic nose, electronic tongue, and headspace solid-phase microextraction gas chromatography-mass spectrometry (HS-SPME-GC-MS). Results indicated that the drying process markedly affected pH, total titratable acidity, total solids, and total soluble solids. Significant differences existed among all samples based on drying method; and the HPD method was superior for preserving ketones, phenols, and esters...
January 30, 2019: Food Chemistry
Da-Som Kim, Hoe Sung Kim, Jookyeong Lee, Jeong Hoon Pan, Young Jun Kim, Jae Kyeom Kim, Seongmin Woo, Eui-Cheol Shin
In this study, the nutritional, functional, and chemical measurements of sensory attributes of different parts of wasabi, namely, leaf, petiole, and rhizome, were investigated. Proximate composition analysis showed the presence of high amounts of carbohydrates in the rhizome and amino acid composition analysis confirmed high proportions of glutamic acid and aspartic acid in all three parts. While proximate composition showed low lipid content in wasabi, ω-3 fatty acids accounted for a high proportion (>44%) of the total lipids...
September 30, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Soo Jin Lee, Hee-Suk Kwon, Woo-Chang Shin, Jin Young Choi, Bong Soo Noh
Flavor patterns of sweet potato spirits (SPS) made from sul - deot manufactured by sweet potato showed an increasing tendency for aging from 64 to 128 weeks. When the SPS was blended with spirits made from sul - deot manufactured by rice in a 7:3 ratio, showing an increase for aging from 16 to 60 weeks, using a gas chromatography-mass spectrometry with solid-phase microextration. The main compounds showing increasing tendency of the SPS and blended spirits (BS) were iso-amyl alcohol, n-propanol. Especially, ethyl caprylate, and ethyl acetate increased in SPS...
April 2018: Food Science and Biotechnology
Li-Ying Chen, Cheng-Chun Wu, Ting-I Chou, Shih-Wen Chiu, Kea-Tiong Tang
Electronic nose (E-nose) systems have become popular in food and fruit quality evaluation because of their rapid and repeatable availability and robustness. In this paper, we propose an E-nose system that has potential as a non-destructive system for monitoring variation in the volatile organic compounds produced by fruit during the maturing process. In addition to the E-nose system, we also propose a camera system to monitor the peel color of fruit as another feature for identification. By incorporating E-nose and camera systems together, we propose a non-destructive solution for fruit maturity monitoring...
September 27, 2018: Sensors
Paolo Pelosi, Jiao Zhu, Wolfgang Knoll
Odour perception has been the object of fast growing research interest in the last three decades. Parallel to the study of the corresponding biological systems, attempts are being made to model the olfactory system with electronic devices. Such projects range from the fabrication of individual sensors, tuned to specific chemicals of interest, to the design of multipurpose smell detectors using arrays of sensors assembled in a sort of artificial nose. Recently, proteins have attracted increasing interest as sensing elements...
September 27, 2018: Sensors
Yang Tao, Juan Xu, Zhifang Liang, Lian Xiong, Haocheng Yang
This paper proposes a way for drift compensation in electronic noses (e-nose) that often suffers from uncertain and unpredictable sensor drift. Traditional machine learning methods for odor recognition require consistent data distribution, which makes the model trained with previous data less generalized. In the actual application scenario, the data collected previously and the data collected later may have different data distributions due to the sensor drift. If the dataset without sensor drift is treated as a source domain and the dataset with sensor drift as a target domain, a domain correction based on kernel transformation (DCKT) method is proposed to compensate the sensor drift...
September 23, 2018: Sensors
Madara Tirzīte, Māris Bukovskis, Gunta Strazda, Normunds Jurka, Immanuels Taivans
Lung cancer is a very common malignancy with a low five-year survival rate. Artificial olfactory sensor (electronic nose) is a tool that recently has been studied as a probable optimal screening tool for early detection of lung cancer, but still no statistical method has been put forward as the preferable one.
 The aim of the study was to explore the use of logistic regression analysis to analyse patients' exhaled breath samples with electronic nose in order to differentiate lung cancer patients (regardless of the stage of the cancer) from patients with other lung diseases and healthy individuals...
September 17, 2018: Journal of Breath Research
Michiel A G E Bannier, Kim D G van de Kant, Quirijn Jöbsis, Edward Dompeling
The measurement of volatile organic compounds (VOCs) in exhaled breath is a promising tool for diagnosing and monitoring various lung diseases in children. Gas chromatography mass spectrometry (GC-MS) analysis is a frequently used standard technique for VOCs analysis. However, as GC-MS is an expensive and time-consuming technique, hand-held devices or electronic noses (eNoses) have been developed. Recently, the Aeonose was introduced as an easy-to-use handheld eNose capable of point-of-care testing. Although first results using this eNose in adults are promising, studies in children are lacking...
September 14, 2018: Journal of Breath Research
Sofia El Manouni El Hassani, Hendrik J Niemarkt, Hager Said, Daniel J C Berkhout, Anton H van Kaam, Richard A van Lingen, Marc A Benninga, Nanne K H de Boer, Tim G J de Meij
Fecal volatile organic compound (VOC) analysis has shown great potential as a noninvasive diagnostic biomarker for a variety of diseases. Before clinical implementation, the factors influencing the outcome of VOC analysis need to be assessed. Recent studies found that the sampling conditions can influence the outcome of VOC analysis. However, the dietary influences remains unknown, especially in (preterm) infants. Therefore, we assessed the effects of feeding composition on fecal VOC patterns of preterm infants (born at <30 weeks gestation)...
September 11, 2018: Sensors
Anupama Bose, Paramita Bhattacharjee
Our previous investigation had established 4.2 kGy to be the appropriate dosage of gamma irradiation for removal of obnoxious rancid-acid-odor of virgin coconut oil (VCO) on the basis of sensory and electronic nose (e nose) studies. This study endeavored to revalidate the sensory data employing fuzzy logic analysis. An equation has been developed for the first time for deriving defuzzified scores, when the sum of the first and third coordinates of the triplet (a b c) of overall sensory score was greater than 100, i...
2018: MethodsX
Adriana Marcia Graboski, Elisiane Galvagni, Alexandra Manzoli, Flavio Makoto Shimizu, Claudio Augusto Zakrzevski, Thiago Andre Weschenfelder, Juliana Steffens, Clarice Steffens
Aroma is closely related to the food product acceptability and an important product quality indicator. Electronic-nose (E-nose) systems are an interesting alternative to traditional methods of aroma analyses. A lab-made E-nose system equipped with an array of sensing units comprised by gold interdigitated microelectrodes (IDEs) using polyaniline (Pani) as sensitive layers deposited by the in situ and Layer-by-layer (LbL) methods was used to analyze aromas in gummy candies. Different concentrations from artificial aromas (apple, strawberry and grape), added to the gummy candies were evaluated...
November 2018: Food Research International
Yunwei Niu, Zhengmin Yao, Zuobing Xiao, Guangyong Zhu, Jiancai Zhu, Jiaying Chen
Although esters were important odorants in light aroma-type liquor, it was still puzzling that sensory interaction between esters made the odor quality of light aroma-type liquor outstanding. The aim of the paper was to investigate perceptual interaction among esters. The odor thresholds of eighteen esters and 35 binary mixture were determined by a three-alternative forced-choice procedure. The relationship between odor threshold and carbon chain length of homologous ethyl esters was investigated. Moreover, 31 binary mixtures present either a synergistic effect or additive action...
November 2018: Food Research International
Yu Chen, Rachel E Owyeung, Sameer R Sonkusale
In this work, a paper-based optoelectronic sensor (paper-nose) is presented for sensing volatile gases in air. The proposed optoelectronic sensor is a combination of both colorimetric (optical) and chemiresistive (electronic) sensor arrays in order to improve the selectivity of the paper-nose in the complex air background. The optical sensors are based on chemoresponsive dyes, namely Reichardt's dye (2,6-diphenyl-4-(2,4,6-triphenyl-1-pyridinio)phenolate), bromocresol purple, methyl red, bromothymol blue, brilliant yellow and manganese tetraphenylporphyrin (Mn-TPP)...
November 30, 2018: Analytica Chimica Acta
Jonathan R N Lacey, Carlos Kidel, Jildou M van der Kaaij, Paul Brinkman, Edward T Gilbert-Kawai, Michael P W Grocott, Michael G Mythen, Daniel S Martin
Electronic nose (e-nose) devices may be used to identify volatile organic compounds (VOCs) in exhaled breath. VOCs generated via metabolic processes are candidate biomarkers of (patho)physiological pathways. We explored the feasibility of using an e-nose to generate human "breathprints" at high altitude. Furthermore, we explored the hypothesis that pathophysiological processes involved in the development of acute mountain sickness (AMS) would manifest as altered VOC profiles. Breath analysis was performed on Sherpa and lowlander trekkers at high altitude (3500 m)...
September 2018: Physiological Reports
Mahlako Malesele Nkogatse, Motsehoa Cynthia Ramotsehoa, Frederick Christofel Eloff, Caradee Yael Wright
The exposure of outdoor car guards to solar ultraviolet radiation (UVR), the majority with deeply-pigmented skin, to solar UVR was measured for five consecutive days during early spring (September 2017) in South Africa using electronic UVR dosimeters attached to the upper arm of each participant. The exposure of the nape of the neck, forehead, nose, cheek and hand were extrapolated from the measurements. The onsite ambient solar UVR on a flat, horizontal, unshaded surface was measured concurrently. The sun-related knowledge, behaviour and attitudes of the car guards were evaluated using questionnaires...
September 5, 2018: Photochemistry and Photobiology
Xianghao Zhan, Xiaoqing Guan, Rumeng Wu, Zhan Wang, You Wang, Guang Li
As alternative herbal medicine gains soar in popularity around the world, it is necessary to apply a fast and convenient means for classifying and evaluating herbal medicines. In this work, an electronic nose system with seven classification algorithms is used to discriminate between 12 categories of herbal medicines. The results show that these herbal medicines can be successfully classified, with support vector machine (SVM) and linear discriminant analysis (LDA) outperforming other algorithms in terms of accuracy...
September 4, 2018: Sensors
Bartosz Szulczyński, Piotr Rybarczyk, Jacek Gębicki
Malodorous odors, by definition, are unpleasant, irritating smells being a mixture of volatile chemical compounds that can be sensed at low concentrations. Due to the increasing problem of odor nuisance associated with odor sensations, and thus the need to remove them from the air, deodorization techniques are commonly used. Biofiltration is one of the methods of reducing odorants in the air stream. In the paper, the possibility of using an electronic nose as an alternative method to gas chromatography for the online monitoring and evaluation of efficiency of the n -butanol vapors biofiltration process in a transient state was investigated...
2018: Monatshefte Für Chemie
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