Antioxidant Properties of Asian Originated Biomaterials Detected with DNA-wrapped Single Walled Carbon Nanotubes

We synthesized double-stranded deoxyribonucleic acid (dsDNA)-wrapped single walled carbon nanotube complexes (dsDNA-SWNT complexes). These dsDNA-SWNT complexes were applied in detecting antioxidant potencies of two biomaterials: coconut water and banana powder solutions. UV-vis spectroscopy was employed to examine the optical response changes of dsDNA-SWNT complexes when these two biomaterials were injected. The wavelength range was from 700 to 1100 nm. After injecting coconut water or banana powder solutions, absorbance values of (6,5) and (7,5) chirality peaks were increased, and this means that these biomaterials have antioxidant potencies. If the initial absorbance of dsDNA-SWNT complexes is defined as 100%, the absorbance values of (6,5) and (7,5) peaks were increased by 105.01 ± 0.94 % and 104.37 ± 0.93 % respectively when coconut water solution was injected. Additionally, a red-shift was seen in this case. When banana powder solution was injected, the absorbances were increased by 101.73 ± 1.20 % and 101.29 ± 0.89 % respectively. No peak shift was resulted in this case. Atomic force microscopy (AFM) images revealed that structures of SWNTs were clearly seen even after adding coconut water solution.