Wireless wearable wristband for continuous sweat pH monitoring

Escobedo, P. et al. (2021) Wireless wearable wristband for continuous sweat pH monitoring. Sensors and Actuators B: Chemical, 327, 128948. (doi: 10.1016/j.snb.2020.128948)

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Abstract

Several studies have shown that the determination of pH in sweat, which is one of the most accessible body fluids, can be an indicator of health and wellness, and even be used for potential disease diagnosis. On that basis, we present herein a wearable wristband for continuous and wireless monitoring of sweat pH with potential applications in the field of personal health assessment. The developed wristband consists of two main parts: a microfluidic cloth analytical device (μCAD) to collect continuously the sweat from skin with a color-based pH sensing area; and a readout and processing module with a digital color sensor to obtain the pH of sweat from the color changes in the μCAD. In addition, the readout module includes a low-power Bluetooth interface to transmit the measurements in real-time to a custom-designed smartphone application. To allow continuous operation, an absorbent pad was included in the design to retire and store thsweat from the sensing area through a passive pump path. It was found that the Hue parameter (H) in the HSV color space can be related to the sweat pH and fitted to a Boltzmann equation (R2 = 0.997). The range of use of the wristband device goes from 6 to 8, which includes the pH range of sweat, with a precision at different pH values from 3.6 to 6.0 %. Considering the typical human sweat rate, the absorbent pad allows continuous operation up to more than 1000 minutes.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Escobedo, Dr Pablo
Creator Roles:
Escobedo, P.Software, Validation, Investigation, Writing – original draft, Visualization, Supervision
Authors: Escobedo, P., Ramos-Lorente, C. E., Martínez-Olmos, A., Carvajal, M. A., Ortega-Muñoz, M., de Orbe-Payá, I., Hernández-Mateo, F., Santoyo-González, F., Capitán-Vallvey, L. F., Palma, A. J., and Erenas, M. M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Sensors and Actuators B: Chemical
Publisher:Elsevier
ISSN:0925-4005
ISSN (Online):1873-3077
Published Online:24 September 2020
Copyright Holders:Copyright © 2020 Elsevier
First Published:First published in Sensors and Actuators B: Chemical 327:128948
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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