Electrochemical impedance spectroscopy based MEMS sensors for phthalates detection in water and juices

Zia, Asif I.; Syaifudin, A. R. Mohd; Mukhopadhyay, Subhas Chandra; Yu, Pak-Lam; Al‐Bahadly, Ibrahim; Gooneratne, Chinthaka P.; Kosel, Jürgen; Liao, Tai-Shan

doi:10.1088/1742-6596/439/1/012026

Cited by 63 publications

(23 citation statements)

References 24 publications

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“…DEHP and DiNP always exist as contaminants in a laboratory setting, so different equipment and reagents, including plastic containers, gloves, aluminium foil and solvent, may contain different phthalates. As a result, the development of a simple detection method is limited by environmental phthalate as a confounding factor . Meanwhile, simple detection methods require a good detection limit (<1 ppm), because some phthalate‐tainted products in the Taiwan food incident of 2011 contained only 1.1 ppm phthalates (Table ).…”

Section: The Plasticizer Adulteration Incident In Taiwanmentioning

confidence: 99%

“…As a result, the development of a simple detection method is limited by environmental phthalate as a confounding factor. 53 Meanwhile, simple detection methods require a good detection limit (<1 ppm), because some phthalate-tainted products in the Taiwan food incident of 2011 contained only 1.1 ppm phthalates (Table 4). Recently, the Food and Drug Administration (FDA) used LC/MS/MS or high-performance liquid chromatography (HPLC) with ultraviolet (UV) detection to analyse various phthalates in food samples, 54,55 and the World Health Organization (WHO) only suggested HPLC and gas chromatography (GC) for detection of DEHP, but no other quick screening methods.…”

Section: Detection Of Dehp and Dinpmentioning

confidence: 99%

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Adverse child health impacts resulting from food adulterations in the Greater China Region

Chow

2017

J Sci Food Agric

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Food adulteration has a long history in human society, and it still occurs in modern times. Because children are relatively vulnerable to food adulterants, studying the health impacts of food adulteration on children is important. This article provides an overview of the child health impacts of food adulterants in two recent food adulteration incidents in the Greater China Region: (1) a plasticizer incident in Taiwan and (2) a 2,4,6-triamino-1,3,5-triazine (melamine)-tainted milk incident in China. The involved food adulterants, di-(2-ethylhexyl) phthalate (DEHP), diisononyl phthalate (DiNP) and melamine, are harmful to the hippocampus, kidneys, reproductive organs and immune system of children, and they also increase the risk of cancer. To detect food adulteration and to avoid further harm caused by food adulteration, simple screening methods have been developed, and they have recently emerged as a new focus area for research. This article also summarizes the simple screening methods used to analyse the aforementioned food adulterants and reports how governments reacted to the recent food incidents. © 2017 Society of Chemical Industry.

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Section: The Plasticizer Adulteration Incident In Taiwanmentioning

confidence: 99%

Section: Detection Of Dehp and Dinpmentioning

confidence: 99%

Adverse child health impacts resulting from food adulterations in the Greater China Region

Chow

2017

J Sci Food Agric

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“…Commercially available photolithography and etching techniques were used for the fabrication process. This type of sensors own advantage of noncontact measurements due to fabrication on a rigid substrate which maintains well-define geometry of the electrode structure essentially required to implement model-based parameter estimation algorithms effectively [27].…”

Section: Sensors Fabrication and Coatingmentioning

confidence: 99%

Post Annealing Performance Evaluation of Printable Interdigital Capacitive Sensors by Principal Component Analysis

Zia

Mukhopadhyay

et al. 2015

IEEE Sensors J.

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The surface roughness of thin-film gold electrodes induces instability in impedance spectroscopy measurements of capacitive interdigital printable sensors. Post-fabrication thermodynamic annealing was carried out at temperatures ranging from 30°C to 210°C in a vacuum oven and the variation in surface morphology of thin-film gold electrodes was observed by scanning electron microscopy. Impedance spectra obtained at different temperatures were translated into equivalent circuit models by applying complex nonlinear least square curvefitting algorithm. Principal component analysis was applied to deduce the classification of the parameters affected due to the annealing process and to evaluate the performance stability using mathematical model. Physics of the thermodynamic annealing was discussed based on the surface activation energies. The post anneal testing of the sensors validated the achieved stability in impedance measurement.Index Terms-Annealing, complex nonlinear least square curve fitting, capacitive interdigital sensors, electrochemical impedance spectroscopy, principal component analysis, printable interdigital sensors, sputtering, thin films.

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“…The electrodes provided alternating power source on the positive terminal and negative terminal and generated alternating current which is provided to the excitation electrode. In figure 2, it shows that the sensor configuration is 1:5, which means that five sensing electrodes are present with respect to one excitation electrode [8]. The presence of a time-dependent voltage signal generates an electric field that bulges out from the sensing electrodes to the excitation electrode through any material situated in close proximity.…”

Section: Sensor Operating Principlementioning

confidence: 99%

Electrochemical impedimetric sensing of nitrate contamination in water

Xie

Zia

Mukhopadhyay

et al. 2015

2015 9th International Conference on Sensing Technology (ICST)

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This paper describes the design and development of a sensing system to detect the nitrate concentration by using planar interdigital sensor immersed in the water sample. Water samples were prepared containing two different salts: Sodium Nitrate (NaNO 3 ) and Ammonium Nitrate (NH 4 NO 3 ) with the concentration ranging from 0.02 PPM to 10 PPM by using the serial dilution method. The water sample was tested by both the commercial equipment (LCR meter) and designed system. Although a difference was observed between these two results, the designed system shows a good linear relationship between the low concentration (0.02 -0.5 PPM) of the water solution and the real part of the impedance. However, the relationship was changed from linear to logarithmic scale at the high concentration (0.05 -10 PPM) of the water solution. The computational formula of concentration was formed from these results. This system has a potential to be used in-situ nitrate contamination detection with real-time monitoring.

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Electrochemical impedance spectroscopy based MEMS sensors for phthalates detection in water and juices

Cited by 63 publications

References 24 publications

Adverse child health impacts resulting from food adulterations in the Greater China Region

Adverse child health impacts resulting from food adulterations in the Greater China Region

Post Annealing Performance Evaluation of Printable Interdigital Capacitive Sensors by Principal Component Analysis

Electrochemical impedimetric sensing of nitrate contamination in water

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