Simulation and Non-Invasive Testing of Vinegar Storage Time by Olfaction Visualization System and Volatile Organic Compounds Analysis.
TL;DR: In this paper, a reaction chamber with an arc baffle embedded in the front of the air inlet for drainage effect was designed, and the velocity of field and particle distribution of flow field in the reaction chamber was simulated by COMSOL Multiphysics.
Abstract: An olfactory visualization system conducts a qualitative or quantitative analysis of volatile organic compounds (VOCs) by utilizing the sensor array made of color sensitive dyes. The reaction chamber is important to the sensor array’s sufficient and even exposure to VOCs. In the current work, a reaction chamber with an arc baffle embedded in the front of the air inlet for drainage effect was designed. The velocity of field and particle distribution of flow field in the reaction chamber was simulated by COMSOL Multiphysics. Through repeated simulation, the chamber achieved optimal result when the baffle curvature was 3.1 and the vertical distance between the baffle front end and the air inlet was 1.6 cm. Under the new reaction chamber, principal component analysis (PCA) and linear discriminant analysis (LDA) were employed to identify vinegar samples with different storage time through analyzing their VOCs. The LDA model achieved optimal performance when 8 principal components (PCs) were used, and the recognition rate was 95% in both training and prediction sets. The new reaction chamber could improve the stability and precision of an olfactory visualization system for VOCs analysis, and achieve the accurate differentiation and rapid discrimination of Zhenjiang vinegar with different storage time.
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TL;DR: In this paper, the authors used physical interventions (ultrasonic field, alternating magnetic field, or combination of both) to assist the aging process with naturally brewed vinegar as a case example.
6 citations
TL;DR: In this article , a review briefly describes that bionic noses with multiple transduction mechanisms are developed based on gas molecules' physical properties: electrical conductivity, visible optical absorption, and mass sensing.
2 citations
TL;DR: In this paper , a 4×3 olfactory sensor array was prepared using 12 chemical dyes (porphyrins) to collect volatile odor information from stored wheat, and a dung beetle optimizer (DBO) algorithm was used to determine the best characteristic color variable combination.
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TL;DR: A simple optical chemical sensing method that utilizes the colour change induced in an array of metalloporphyrin dyes upon ligand binding while minimizing the need for extensive signal transduction hardware is reported.
Abstract: Array-based vapour-sensing devices are used to detect and differentiate between chemically diverse analytes. These systems--based on cross-responsive sensor elements--aim to mimic the mammalian olfactory system by producing composite responses unique to each odorant. Previous work has concentrated on a variety of non-specific chemical interactions to detect non-coordinating organic vapours. But the most odiferous, toxic compounds often bind readily to metal ions. Here we report a simple optical chemical sensing method that utilizes the colour change induced in an array of metalloporphyrin dyes upon ligand binding while minimizing the need for extensive signal transduction hardware. The chemoselective response of a library of immobilized vapour-sensing metalloporphyrin dyes permits the visual identification of a wide range of ligating (alcohols, amines, ethers, phosphines, phosphites, thioethers and thiols) and even weakly ligating (arenes, halocarbons and ketones) vapours. Water vapour does not affect the performance of the device, which shows a good linear response to single analytes, and interpretable responses to analyte mixtures. Unique colour fingerprints can be obtained at analyte concentrations below 2 parts per million, and responses to below 100 parts per billion have been observed. We expect that this type of sensing array will be of practical importance for general-purpose vapour dosimeters and analyte-specific detectors (for insecticides, drugs or neurotoxins, for example).
1,314 citations
TL;DR: The use of submerged bacterial culture and a continuous aeration system has been used to produce wine vinegar in most Mediterranean countries and extensively used as a condiment, acidifying and food preserving agent as discussed by the authors.
Abstract: Wine vinegar is produced in most Mediterranean countries and extensively used as a condiment, acidifying and food preserving agent. Traditional production requires maturation in wood for many years to obtain a high acetic degree and the resulting product is relatively expensive. New technologies are being designed to overcome this difficulty with the objective of producing vinegars with a similar quality and at the same time less expensive. These methods of production involve the use of submerged bacterial culture and a continuous aeration system. Recent research is focussed in improving yield and quality of the final product.
213 citations
TL;DR: In this paper, the measured data from the individual systems are combined for improved estimation of black tea quality, and it is found that for the combined system, both the clustering and classification rates improve when compared to individual systems.
121 citations
TL;DR: In this paper, the authors reported fabrication and characterization of high sensitivity capacitive humidity sensors based on ZnO nanorods, which have been grown by means of chemical bath deposition.
Abstract: Recently, humidity sensors due to their broad applications in meteorology, health science, food science, and agriculture have been under extensive investigation. We report fabrication and characterization of high sensitivity capacitive humidity sensors based on ZnO nanorods. ZnO nanorods have been grown by means of chemical bath deposition. We have observed that by changing the seed layer thickness, nanorods with different aspect ratios and densities could be achieved. Furthermore, it is demonstrated that decreasing the density of nanorods has a positive effect on the response of the sensor. Moreover, an equivalent circuit model is proposed to explain the sensing mechanism. The devices were also simulated with COMSOL Multiphysics and a very good agreement with experimental data was observed. Finally a solution for increasing the sensitivity of the sensors is proposed.
70 citations
TL;DR: A planar microstrip ring resonator structure on alumina was developed using the commercial FEM software COMSOL, leading to an optimized design of a miniaturized microwave gas sensor that was successfully operated at room temperature as a humidity sensor.
Abstract: A planar microstrip ring resonator structure on alumina was developed using the commercial FEM software COMSOL. Design parameters were evaluated, eventually leading to an optimized design of a miniaturized microwave gas sensor. The sensor was covered with a zeolite film. The device was successfully operated at around 8.5 GHz at room temperature as a humidity sensor. In the next step, an additional planar heater will be included on the reverse side of the resonator structure to allow for testing of gas-sensitive materials under sensor conditions.
62 citations