Using a small and inexpensive biosensor, researchers at the University of British Columbia (UBC) have developed a novel low-cost technique that quickly and accurately detects cryptosporidium contamination in water samples.

Cryptosporidium is an intestinal pathogen and one of the leading causes of respiratory and gastrointestinal illness in the world. Drinking water contaminated with the parasite can result in diarrhea and, in extreme cases, can even lead to death.

“Current methods for detecting cryptosporidium require filtering large volumes of water, separating out the organisms, staining them with a fluorescence label and trying to identify the pathogen using a microscope,” said George Luka, a doctoral student at UBC Okanagan’s School of Engineering and lead author if the study. “The process is extremely slow, expensive, and doesn’t yield reliable results.”

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Image Credit: University of British Columbia

Luka says there is an urgent need to develop a fast, flexible, accurate, and real-time detection tool to meet the challenge of protecting water consumers from this common and potentially dangerous contaminant.

To solve this problem, Luka and his colleagues tested a specially designed and calibrated biosensor. Using varying concentrations of the pathogen in water samples, they were able establish its ability to detect cryptosporidium contamination.

“The biosensor performed exactly as we were hoping and was able to measure cryptosporidium contamination rapidly and without the need for complex preparations and highly-trained technicians,” said Luka. “This is an impressive solution that can easily be integrated into inexpensive and portable devices to test drinking water in real-time anywhere in the world.”

Luka also said the biosensor can be expanded to measure other biomarkers and hazards.

“The technology has real potential to be used to test all kinds of biological contamination, both in medical and environmental applications,” said Luka. “A handheld sensor that tests the safety of our water and our environment could soon become a reality.”

The research was published recently in the journal Sensors and was funded by the India-Canada Centre for Innovative Multidisciplinary Partnerships to Accelerate Community Transformation and Sustainability (IC-IMPACTS).

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