Alterations in structure of biomolecules using ATR-FTIR and histopathological variations in brain tissue of Channa punctatus exposed to 2Naphthalene sufonate.

2Naphthalene sulfonate (2NS) is an intermediate compound used in textile industries. Being nonbiodegradable, the concerns regarding its biotoxicity have risen. In the present investigation the toxic effects of 2NS were analyzed with the help of Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR), which was used to monitor changes in the vibrational modes of functional groups within the biomolecules. After calculating LD 50, one half of LD 50 i.e. 0.33 mg/15 g b.w. was intraperitoneally administrated and the brain tissue was collected for investigation after 96 h of exposure. The spectra observed revealed the significant differences in absorbance and areas between control and treated groups reflecting the change in proteins, lipids and nucleic acid due to toxicity induced by 2NS. In addition, protein secondary structure analysis was focused in this study, which reveals alterations in α helix and β sheet structure after 2NS intoxication. Histopathology of brain was also studied, which reveals changes in the histology of brain in group treated with 2NS. In conclusion, the study highlighted the application of ATR-FTIR and histopathology for toxicity assessment.