Figure 5

DNA isolation after collecting sample using poly(L-DOPA)-coated swab. (a) Isolated DNA concentrations, (b) its absorbance ratios of 260 nm/280 nm and (c) agarose gel electrophoresis image of GAPDH PCR product using the isolated DNA from cells directly added to lysis buffer (Control), from cells collected by the swab (Swab-cell) and from saliva spiked with cells collected by the swab (Swab-cell + saliva).