Selective and sensitive onsite detection of phthalates in common solvents

Venkatesh, S., Yeung, C.-C., Sun, Q.-J., Zhuang, J., Li, T., Li, R. K.Y. and Roy, V. A.L. (2018) Selective and sensitive onsite detection of phthalates in common solvents. Sensors and Actuators B: Chemical, 259, pp. 650-657. (doi: 10.1016/j.snb.2017.12.107)

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Abstract

Phthalates, which are proven to have adverse health effects, are globally restricted for use in all kinds of plastics through various regulations. Although there are laboratory based techniques for phthalate detection, there is a pressing need for a field based technique so samples can be pre-screened. Here, we report a molecularly imprinted polymer (MIP) functionalized extended gate field effect transistor (EGFET) as a field sensor to identify di-2-ethlyhexyl phthalate (DEHP), which is the one of the most commonly used phthalate. In DI water, DEHP is detected at the extremely low concentration of 25 μg/L while exhibiting excellent selectivity. We are able to tune the linear dynamic range of the sensor by synthesizing the MIP with a different monomer-to-template ratio and by choice of the functional monomer. Finally, the sensor is calibrated for DEHP in artificial saliva at sub 50 μg/L, showing applicability in phthalate migration tests, which are used in assessing the safety of plastic toys. Furthermore, our sensor platform can be further extended to identify other phthalates as fast pre-screening tool.

Item Type:Articles
Additional Information:Research Grant Council of HKSAR Project (No. T42-103/16 & C7045-14E).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Vellaisamy, Professor Roy
Authors: Venkatesh, S., Yeung, C.-C., Sun, Q.-J., Zhuang, J., Li, T., Li, R. K.Y., and Roy, V. A.L.
College/School:College of Science and Engineering > School of Engineering
Journal Name:Sensors and Actuators B: Chemical
Publisher:Elsevier
ISSN:0925-4005
ISSN (Online):1873-3077
Published Online:18 December 2017
Copyright Holders:Copyright © 2017 Elsevier B.V.
First Published:First published in Sensors and Actuators B: Chemical 259:650-657
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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