A microfluidic preconcentrator for enhanced monitoring of ethylene gas

Dow, Ali B. Alamin; Sklorz, Adam; Lang, Walter

doi:10.1016/j.sna.2011.01.019

Cited by 17 publications

(7 citation statements)

References 15 publications

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“…Moreover, the µPC replaces the injection and the sampling units that are normally used in GC systems. In Dow et al [39], a system is described, which was designed for ethylene detection, but the sensitivity improvement with this µPC could not reach the necessary ppb level. In Lin et al [40] and in Tian et al [41], miniaturized µPC devices are described as well.…”

Section: (D) Gas Chromatographymentioning

confidence: 99%

Ethylene detection in fruit supply chains

Janssen

Schmitt

Blanke

et al. 2014

Phil. Trans. R. Soc. A.

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Ethylene is a gaseous ripening phytohormone of fruits and plants. Presently, ethylene is primarily measured with stationary equipment in laboratories. Applying in situ measurement at the point of natural ethylene generation has been hampered by the lack of portable units designed to detect ethylene at necessary resolutions of a few parts per billion. Moreover, high humidity inside controlled atmosphere stores or containers complicates the realization of gas sensing systems that are sufficiently sensitive, reliable, robust and cost efficient. In particular, three measurement principles have shown promising potential for fruit supply chains and were used to develop independent mobile devices: non-dispersive infrared spectroscopy, miniaturized gas chromatography and electrochemical measurement. In this paper, the measurement systems for ethylene are compared with regard to the needs in fruit logistics; i.e. sensitivity, selectivity, long-term stability, facilitation of automated measurement and suitability for mobile application. Resolutions of 20–10 ppb can be achieved in mobile applications with state-of-the-art equipment, operating with the three methods described in the following. The prices of these systems are in a range below €10 000.

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Section: (D) Gas Chromatographymentioning

confidence: 99%

Ethylene detection in fruit supply chains

Janssen

Schmitt

Blanke

et al. 2014

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Gas chromatography (GC) is a common type of chromatography for separation and analysis of volatile compounds in many research and industrial laboratories [ 15 ]. Although many applications of GC have been used to measure ethylene from fruit, it is a time consuming process and is not easily reproduced as the sampled amount could differ slightly [ 16 , 17 , 18 , 19 ]. An olefin detector based on the metal-organic framework was obtained to measure the ethylene gas by quenching fluorescence [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

A Low Cost Compact Measurement System Constructed Using a Smart Electrochemical Sensor for the Real-Time Discrimination of Fruit Ripening

Chen

Chang

et al. 2016

Sensors

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Ethylene as an indicator for evaluating fruit ripening can be measured by very sensitive electrochemical gas sensors based on a high-resolution current produced by a bias potential applied to the electrodes. For this purpose, a measurement system for monitoring ethylene gas concentrations to evaluate fruit ripening by using the electrochemical ethylene sensor was successfully developed. Before the electrochemical ethylene sensor was used to measure the ethylene gas concentrations released from fruits, a calibration curve was established by the standard ethylene gases at concentrations of 2.99 ppm, 4.99 ppm, 8.01 ppm and 10 ppm, respectively, with a flow rate of 0.4 L·min−1. From the calibration curve, the linear relationship between the responses and concentrations of ethylene gas was obtained in the range of 0–10 ppm with the correlation coefficient R2 of 0.9976. The micropump and a novel signal conditioning circuit were implemented in this measurement, resulting in a rapid response in detecting ethylene concentrations down to 0.1 ppm in air and in under 50 s. In this experiment, three kinds of fruits—apples, pears and kiwifruits—were studied at a low concentration (under 0.8 ppm) of trace ethylene content in the air exhaled by fruits. The experimental results showed that a low cost, compact measurement system constructed by using an electrochemical ethylene sensor has a high sensitivity of 0.3907 V·ppm−1 with a theoretical detection limit of 0.413 ppm, and is non-invasive and highly portable.

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“…In recent years, various kinds of natural disasters and hazardous substances accidents have occurred repeatedly, causing great losses. The deployment of wireless sensor networks (WSNs) in the hazardous area is helpful in real-time monitoring of environmental indicators and improving the efficiency and quality of emergency rescue [1,2].…”

Section: Introductionmentioning

confidence: 99%

Toward Improved RPL: A Congestion Avoidance Multipath Routing Protocol with Time Factor for Wireless Sensor Networks

Tang

Huang

et al. 2016

Journal of Sensors

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Designing routing protocols in Low power and Lossy Networks (LLNs) imposes great challenges. In emergency scenarios, the large and rapid data traffic caused by emergencies will lead to network congestion and bring about significant packet loss and delay. Routing protocol for LLNs (RPL) is the IETF standard for IPv6 routing in LLNs. The basic version of RPL uses Expected Transmission Count (ETX) as the default routing metric; it cannot solve the problem of sudden large data traffic. In this paper, we propose a congestion avoidance multipath routing protocol which uses composite routing metrics based on RPL, named CA-RPL. A routing metric for RPL that minimized the average delay towards the DAG root is proposed, and the weight of each path is computed by four metrics. The mechanism is explained and its performance is evaluated through simulation experiments based on Contiki. Simulation results show that the proposed CA-RPL reduces the average time delay by about 30% compared to original RPL when the interpacket interval is short and has almost 20% reduction in packet loss ratio. The CA-RPL can effectively alleviate the network congestion in the network with poor link quality and large data traffic and significantly improve the performance of LLNs.

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A microfluidic preconcentrator for enhanced monitoring of ethylene gas

Cited by 17 publications

References 15 publications

Ethylene detection in fruit supply chains

Ethylene detection in fruit supply chains

A Low Cost Compact Measurement System Constructed Using a Smart Electrochemical Sensor for the Real-Time Discrimination of Fruit Ripening

Toward Improved RPL: A Congestion Avoidance Multipath Routing Protocol with Time Factor for Wireless Sensor Networks

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