The present invention relates to delivering sample preparation technologies to enhance the performance of point-of-care agricultural diagnostics by improving the capacity to detect trace contaminations of pathogenic organisms along the entire food supply chain including pre- and post-harvest processing and distribution. Sample preparation is crucial for adequate test performance of downstream diagnostics like LAMP and supports sensitive detection of bacterial contaminates. This invention increases the speed and scale of routine pathogen surveillance and the efficacy of management response and mitigation of foodborne disease outbreaks.