Nucleic Acid Lateral Flow Immunoassay (NALFIA)

Principle of NALFIA

Lateral flow tests based on immunochromatographic principles are currently mainly used for the qualitative analysis of different types of analytes. A new promising application of lateral flow testing is the detection of genetic material. The method, called NALFIA, is a method that combines the principles of molecular biology detection with the principles of immunochemical visualization.

NALFIA is designed to test for the presence of amplified double-stranded nucleic acid sequences specific to the organism analyzed using primers with two different tags. Specifically, after DNA is isolated from the sample, a duplex PCR is performed using two primer sets, one of which is labeled with biotin and the other with either digoxigenin or fluorescein. The PCR solution and avidin-conjugated carbon particles are added directly to a nitrocellulose membrane, and two test lines are immobilized with dioxin- and fluorescein-specific antibodies. The appearance of black lines indicates the presence of a specific amplicon.

Fig. 1 Schematic picture of immunochromatographic test for nucleic acid detection. (Blazkova M, et al, 2009)

Applications of NALFIA

• Clinical Diagnostics
  NALFIA has emerged as a valuable tool in clinical diagnostics, enabling the rapid and accurate detection of infectious diseases, genetic disorders, and cancer biomarkers. It offers a point-of-care solution, allowing for on-site testing without the need for specialized laboratory equipment or extensive sample preparation.
  For instance, NALFIA has been successfully employed in the detection of viral pathogens, such as SARS-CoV-2, providing a rapid and accessible testing method during the COVID-19 pandemic. Additionally, it has shown promise in identifying genetic mutations associated with hereditary diseases, enabling early diagnosis and personalized treatment strategies.
  Please visit our COVID-19 Antigen Lateral Flow Assay Development page to see more.
• Food Safety
  Ensuring food safety is crucial for public health, and NALFIA has emerged as a valuable tool for rapid and on-site detection of foodborne pathogens and contaminants. It offers a convenient and reliable method for screening samples, allowing timely interventions to prevent foodborne illnesses.
  By employing NALFIA, food producers and regulatory authorities can quickly detect pathogens such as Salmonella, Listeria, and E. coli, reducing the risk of contaminated products reaching consumers. Moreover, it can be used to detect allergens and other contaminants, enhancing overall food safety standards.
• Environmental Monitoring
  NALFIA has also found applications in environmental monitoring, enabling the detection of microbial pollutants and the monitoring of water quality. Its simplicity and rapidity make it an ideal tool for on-site testing in remote areas or locations where laboratory facilities are limited.
  By using NALFIA, researchers and environmental agencies can quickly assess the presence of harmful microorganisms in water sources, ensuring the safety of drinking water supplies. It can also aid in the detection of environmental pathogens and the monitoring of pollution levels, contributing to effective environmental management strategies.

In conclusion, by harnessing the potential of NALFIA, researchers, healthcare professionals, and food safety experts can enhance their ability to detect and monitor diseases, ensuring timely interventions and improving overall public health. Creative Diagnostics is committed to advancing NALFIA technology and providing high-quality products to meet the growing needs of the diagnostic industry. With our professional knowledge and commitment to innovation, we continue to support our customers and partners worldwide.