The Formation of 8-OHDG from Toxic Substances Trigger to Free Radicals
Keywords:
Toxicology, 8-OHdG, biomarkers, DNA AdductAbstract
This study is conducted to see the profile of DNA Adduct (8-OHdG) formation as DNA damage indicators, by using calf thymus DNA incubated with toxic and carcinogenic compounds. The compounds which could trigger free radicals in this research are PAH(Benzo[a]Pyrene), and CuCl2. Calf thymus DNA was incubated with Benzo[a]Pyrene and CuCl2 compounds under pH and temperature variations to induce the formation of reactive oxygen species (ROS) in the process of oxidative DNA damage. From this research, all of compounds have potency to trigger the formation of DNA Adduct (8-OHdG). The ratio of absorbance to assess the purity of DNA at 260 nm and 280 nm (λ260/ λ280) is measured at ~1.9. The shifted peaks at λmax are indicating changes on structures of DNA as a result of calf thymus DNA incubation with B[a]P and CuCl2. The highest level of 8-OHdG results in calf thymus DNA incubation with B[a]P and CuCl2 under pH 8.5 and incubation temperature at 60°C, is about 120.856 μg/L.
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