Greek researchers have developed a new paper-based DNA biosensor for milk adulteration detection, which uses the properties of gold nanoparticles for visual detection. DNA from milk-based yoghurt samples was isolated, and species-specific DNA sequences for cow, sheep and goat were amplified and identified by the biosensor using specific DNA probes. The proposed paper-based DNA biosensor offered 10 times higher detectability than other methods, good specificity and reproducibility. It has the potential to be applied to other foods.
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