Nanoporous gold is like a sponge of tiny pores. It could be used to make new devices to detect pathogens. Credit: Erkin ?eker, UC Davis
UC Davis Dept of Electrical and Computer Engineering demonstrated that they could detect nucleic acids using nanoporous gold, a novel sensor coating material, in mixtures of other biomolecules that would gum up most detectors. This method enables sensitive detection of DNA in complex biological samples, such as serum from whole blood.
“Nanoporous gold can be imagined as a porous metal sponge with pore sizes that are a 1000X smaller than the diameter of a human hair,” said Assist. Prof Erkin Seker. “What happens is the debris in biological samples, such as proteins, is too large to go through those pores, but the fiber-like nucleic acids that we want to detect can actually fit through them. It’s almost like a natural sieve.”
Rapid and sensitive detection of nucleic acids plays a crucial role in early identification of pathogenic microbes and disease biomarkers. Current sensor approaches usually require nucleic acid purification that relies on multiple steps and specialized laboratory equipment, which limit the sensors’ use in the field. The researchers’ method reduces the need for purification.
APPS: It could be translated into the development of miniature point-of-care diagnostic platforms for agricultural and clinical applications. “The applications of the sensor are quite broad ranging from detection of plant pathogens to disease biomarkers,” said Seker. eg seeing pathogen exists on a plant without seeing any symptoms. And in sepsis cases in humans, doctors might determine bacterial contamination much more quickly than at present, preventing any unnecessary treatments.
http://blogs.ucdavis.edu/egghead/2015/09/04/nanoporous-gold-sponge-makes-pathogen-detector/
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