Breakthrough in Food Safety Analysis: Laser-Induced Graphene Sensor for Rapid Salmonella Detection

Strategic Insights -

Research conducted by Iowa State University has led to the development of a new electrochemical immunosensor capable of detecting Salmonella enterica serovar Typhimurium with high sensitivity, rapid response time, and no requirement for sample pretreatment. This innovation uses laser-induced graphene electrodes decorated with nickel oxide nanoparticles to detect the bacteria in food samples, offering a promising new sensing platform for pathogen detection in food safety monitoring.

Key Takeaways:

  • The electrochemical immunosensor developed in this study provides a simple fabrication method followed by functionalization and rapid Salmonella Typhimurium sensing.
  • The sensor exhibits a sensitivity of 3.93 ± 0.25 Ω (log (CFU mL-1)-1) and a limit of detection (LOD) of 8 ± 3 CFU mL-1 in buffer.
  • The sensor also shows a rapid response time of 17 minutes and a wide linear sensing range from 101 to 106 CFU mL-1 in buffer.
  • The LIG-NiO-based immunosensor provides a promising new sensing platform for pathogen detection in food safety monitoring and other electrochemical immunosensing applications.
  • The research has been funded by the National Institute of Food & Agriculture, National Science Foundation (NSF), and United States Department of Agriculture (USDA).
  • The development of this sensor was supported by the collaboration of researchers from Iowa State University, including Carmen L. Gomes, Daniela A. Oliveira, Cicero C. Pola, Zachary T. Johnson, Jonathan C. Claussen, Jingzhe Li, Emily A. Smith, Eric S. McLamore, and Diana C. Vanegas.

Statistics:

  • 3.93 ± 0.25 Ω: sensitivity of the electrochemical immunosensor
  • 8 ± 3 CFU mL-1: limit of detection (LOD) of the sensor in buffer
  • 17 minutes: rapid response time of the sensor
  • 101 to 106 CFU mL-1: linear sensing range of the sensor in buffer
  • 192(6): issue number of the journal Microchimica Acta where the research was published
  • 2025: year of publication of the research findings

Sources:

  • Microchimica Acta, 2025; 192(6)
  • Iowa State University
  • National Institute of Food & Agriculture
  • National Science Foundation (NSF)
  • United States Department of Agriculture (USDA)