A Gas-Phase Colorimetric Sensor for the Detection of Amine Spoilage Products in Packaged Fish

Crowley, Karl; Pacquit, Alexis; Hayes, Jeremiah F.; Lau, King Tong; Diamond, Dermot

doi:10.1109/icsens.2005.1597809

Cited by 14 publications

(16 citation statements)

References 4 publications

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“…By employing the most suitable optical detection method sensitivity issues can be addressed. Methods such as charge coupled devices [31], light wave multimeters [19], flat bed scanners [32][33][34] and photodiodes [35][36][37] have been explored previously. While functional, not all are suitable for the applications outlined earlier in terms of practicality, portability and scalability.…”

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confidence: 99%

A new light emitting diode–light emitting diode portable carbon dioxide gas sensor based on an interchangeable membrane system for industrial applications

Vargas-Sansalvador

Fay

Phelan

et al. 2011

Analytica Chimica Acta

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A new system for CO2 measurement (0-100%) by based on a paired emitter-detector diode arrangement as a colorimetric detection system is described. Two different configurations were tested: configuration 1 (an opposite side configuration) where a secondary inner-filter effect accounts for CO2 sensitivity. This configuration involves the absorption of the phosphorescence emitted from a CO2-insensitive luminophore by an acid-base indicator and configuration 2 wherein the membrane containing the luminophore is removed, simplifying the sensing membrane that now only contains the acid-base indicator. In addition, two different instrumental configurations have been studied, using a paired emitter-detector diode system, consisting of two LEDs wherein one is used as the light source (emitter) and the other is used in reverse bias mode as the light detector. The first configuration uses a green LED as emitter and a red LED as detector, whereas in the second case two identical red LEDs are used as emitter and detector. The system was characterised in terms of sensitivity, dynamic response, reproducibility, stability and temperature influence. We found that configuration 2 presented a better CO2 response in terms of sensitivity.Key words. Carbon dioxide sensor; Gas sensor; Optical sensor; Paired emitter detector-diode sensor; Portable instrumentation. INTRODUCTIONCO2 is an important industrial gas for many different uses that include production of chemicals (e.g. urea ), inert agent for food packaging (to extend the shelf-life of meat, cheese, etc.), beverages, refrigeration systems, welding systems, fire extinguishers, water treatment processes, and many other smaller scale applications [1;2]. In the agro-food industry CO2 is widely used in modified-atmosphere packaging where its task is to inhibit growth of spoilage bacteria [3;4]. For instance, in active packaging technologies a CO2 generating system can be considered as a technique complimentary to oxygen scavenging [5]. High CO2 levels (10-80 %) are desirable for foods such as meat and poultry in order to inhibit surface microbial growth and to extend their life time. The maintenance of CO2 concentration within packages in food [6], as instance using inserted sachets [7;8], must be carefully monitored since CO2 permeability is 3-5 times higher than that of oxygen for most of the plastic films and because CO2 is absorbed by many foods like meat and poultry. Real-time process monitoring is fundamental for effective process control. The rapid development of bioprocess applications together with the agro-food industry have led to an intensive search for new sensors capable of providing real-time information about the state of the processes. Conventional methods for CO2 determination include, among others, infrared spectrometry [9] or electrochemical sensors based on liquid (Severinghaus-type electrodes) or solid electrolytes [10;11]. The most popular sensors used for CO2 gas sensing in biotechnological applications are based on electrochemical measurements that can...

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mentioning

confidence: 99%

A new light emitting diode–light emitting diode portable carbon dioxide gas sensor based on an interchangeable membrane system for industrial applications

Vargas-Sansalvador

Fay

Phelan

et al. 2011

Analytica Chimica Acta

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“…Over the last two decades chemical sensing has consistently remained an important research topic owing to a diverse range of applications in various areas such as clinical assays [1,2,3], food quality monitoring [4,5], process monitoring [6], and environmental sensing [7,8].…”

Section: Introductionmentioning

confidence: 99%

The optimisation of a paired emitter–detector diode optical pH sensing device

Orpen

Beirne

Fay

et al. 2011

Sensors and Actuators B: Chemical

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With recent improvements in wireless sensor network hardware there has been a concurrent push to develop sensors that are suitable in terms of price and performance.In this paper a low cost gas sensor is detailed, and significant improvements in sensor characteristics have been achieved compared to previously published results. A chemical sensor is presented based on the use of low cost LEDs as both the light source and photodetector, coupled with a sensor slide coated with a pH sensitive colorimetric dye to create a simple gas sensor. Similar setups have been successfully used to detect both acetic acid and ammonia. The goal of this work was to optimise the system performance by integration of the sensing technique into a purposely deigned flowcell platform that holds the colorimetric slide and optical detector in position. The reproducibility of the sensor has been improved through this arrangement and careful control of deposited film thickness. The enhanced reproducibility between sensors opens the potential of calibration-free measurement, in that calibration of one sensor can be used to model the characteristics of all sensors in a particular batch.

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“…One way to address the issue of sensitivity is to select the most appropriate optical detection system used in conjunction with the chemical sensing layer. Optical detectors typically employed within optical chemical sensors include LEDs as the light source coupled with a charge coupled device (CCD) [7,8], light wave multimeter [8] and photodiode [9][10][11]. Other optical chemical sensors reported have employed a tungsten-halogen light source coupled with a CCD [12] in addition to flatbed scanners [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The colorimetric pH chemical sensor formulation employed within the WSN system for the detection of acetic acid was adapted from pH chemical sensors developed by Crowley et al which were applied to the real time monitoring of spoilage in fish packaging [9].…”

Section: Introductionmentioning

confidence: 99%

“…Common methods which have typically been employed in the fabrication of chemical sensors include dip-coating [12,24,25], drop-casting [16][17][18]26], spin-coating [11,27,28] and screen printing [9]. Disadvantages associated with these methods can include limited deposition control with regard to film thickness, positioning and patterning capabilities [29].…”

Section: Introductionmentioning

confidence: 99%

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