Micro-nano-bio acoustic system for the detection of foodborne pathogens in real samples

Publication date: 15 July 2018 Source:Biosensors and Bioelectronics, Volume 111 Author(s): George Papadakis, Pavla Murasova, Audrey Hamiot, Katerina Tsougeni, Georgia Kaprou, Michael Eck, David Rabus, Zuzana Bilkova, Bruno Dupuy, Gerhard Jobst, Angeliki Tserepi, Evangelos Gogolides, Electra Gizeli The fast and efficient detection of foodborne pathogens is a societal priority, given the large number of food-poisoning outbreaks, and a scientific and technological challenge, given the need to detect as little as 1 viable cell in 25 gr of food. Here, we present the first approach that achieves the above goal, thanks to the use of a micro/nano-technology and the detection capability of acoustic wave sensors. Starting from 1 Salmonella cell in 25 ml of milk, we employ immuno-magnetic beads to capture cells after only 3 h of pre-enrichment and subsequently demonstrate efficient DNA amplification using the Loop Mediated Isothermal Amplification method (LAMP) and acoustic detection in an integrated platform, within an additional ½ h. The demonstrated 4 h sample-to-analysis time comes as a huge improvement to the current need of few days to obtain the same result. In addition, the work presents the first reported Lab-on-Chip platform that comprises an acoustic device as the sensing element, exhibiting impressive analytical features, namely, an acoustic limit of detection of 2 cells/μl or 3 aM of the DNA target and ability to detect in a label-free manner dsDNA ...
Source: Biosensors and Bioelectronics - Category: Biotechnology Source Type: research