Accurate Detection of Irradiated Foods Using DNA-FTIR Analysis

Researchers from Cairo University have investigated the effectiveness of DNA-FTIR analysis in detecting gamma-irradiated calf liver, with a focus on verifying compliance with permissible dose limits. The study aimed to differentiate between various irradiation doses and identify doses that exceed safety limits. The research involved using DNA-FTIR spectroscopy and DNA comet assays to analyze the samples.

Key Takeaways:

• DNA-FTIR combined with scatter plot analysis of spectral band characterization parameters and hierarchical cluster analysis (HCA) was used to detect irradiated calf liver samples.
• The DNA-FTIR spectroscopy and DNA comet assays were performed on 18 liver samples, with six sets of samples prepared for different irradiation doses (1.5, 3, 4.5, 7, and 11 kGy) and one non-irradiated control group (0 kGy).
• The comet test showed a sensitivity of 92% and an accuracy of 83% in distinguishing between irradiated and non-irradiated liver samples, but failed to effectively distinguish between different doses of radiation-induced DNA damage.
• Six DNA-FTIR bands were identified as reliable discriminative markers for determining if a liver sample was irradiated, with the P-O-C symmetric vibration band at 1104 cm(-1) demonstrating optimal discriminative accuracy and sensitivity of 100%.
• The hierarchical cluster analysis (HCA)-dendrogram allowed for successful classification of samples based on the homogeneity of DNA spectral characteristics.
• The study concluded that using DNA-FTIR together with HCA can accurately determine the irradiation history of plant and animal food products, making it a practical and effective method.

Statistics:

• 18 liver samples were analyzed using DNA-FTIR spectroscopy and DNA comet assays.
• 6 sets of liver samples were prepared for various irradiation doses (1.5, 3, 4.5, 7, and 11 kGy) and one non-irradiated control group (0 kGy).
• The comet test showed a sensitivity of 92% and an accuracy of 83% in distinguishing between irradiated and non-irradiated liver samples.
• 6 DNA-FTIR bands were identified as reliable discriminative markers for determining if a liver sample was irradiated.

Sources:

• Fahmy, H. M., et al. "Comparative Dna-based Detection of Irradiated Calf Liver Using Ftir Spectroscopy and Comet Assay." Brazilian Journal of Physics, vol. 55, no. 5, 2025.
• Brazilian Journal of Physics, Springer, One New York Plaza, Suite 4600, New York, NY, United States.