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Urine-Powered oPAD Takes Point of Care Testing to a New Low (Cost)

March 13th, 2012 Gavin Corley Diagnostics

Prof. Richard Crooks and doctoral student Hong Liu at the The University of Texas at Austin have developed an  origami-inspired paper sensor which may be used to test for a variety of diseases. The sensor, cheekily dubbed “oPAD” (origami Paper Analytical Device), was designed as a low cost, parallel point of care testing device.

The sensor is based on similar technology to existing paper fluidics testing devices such as home pregnancy testing strips. A hydrophobic material, such as wax or photoresist, is patterned onto chromatography paper. These hydrophobic channels direct a test sample of urine, blood, or saliva to spots on the paper where test reagents have been embedded.

The origami approach adopted by the researchers means that several tests may be run simultaneously using a single sample at an extremely low cost. The sensor is so easy to develop it could potentially be fabricated using an inkjet printer, some special inks for the reagents and some neat folding. The researchers have also been experimenting with a low cost, pee-powered, battery system for the sensor, to facilitate tests that require an energy source. Salt in the urine samples acts as an electrolyte for the battery to power the sensor.

The results of the team’s experiments with the oPAD were published in October in the Journal of the American Chemical Society and details of the battery system were published last week in Analytical Chemistry. Provocative titles aside, we think this is a fantastic innovation and are looking forward to seeing how it progresses from here.

Press release: Origami-Inspired Paper Sensor Could Test for Malaria and HIV for Less than 10 Cents, Report Chemists

Abstract in Journal of American Chemical Society: Three-Dimensional Paper Microfluidic Devices Assembled Using the Principles of Origami

Abstract in Analytical Chemistry: Paper-Based Electrochemical Sensing Platform with Integral Battery and Electrochromic Read-Out

Gavin Corley

Gavin holds a first-class Bachelor’s degree in Electronic Engineering degree from the University of Limerick and a Ph.D. in Biomedical Engineering from the National University of Ireland, Galway. He is currently a post-doctoral research and project leader at the NUI Galway where he has spent the last 2 years leading the product development and commercialization of two novel technologies for the management of varicose veins and chronic venous leg ulcers. He has published several research papers in the fields of anatomy, physiology and medical physics and is the lead author of one patent application to date. In his free time Gavin has been known to swim, cycle and hum a tune or two.

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