Abstract: In an embodiment, the present invention relates to a technique in which small-sized cfDNA is detected, with ultrahigh sensitivity, from a liquid sample such as urine, cerebrospinal fluid, plasma, blood, pleural fluid, or body fluid, is concentrated and isolated, and then is analyzed for gene mutations without PCR. In particular, in a case where a positively charged nanostructure is used, capture and detection rates for cfDNA can be increased. A detection method according to an embodiment of the present invention does not require a PCR amplification reaction, which greatly shortens the time taken to obtain a result. In addition, since direct on-site analysis is possible without the need for specific equipment, it is expected that the present invention can be used as a point-of-care testing (POCT) capable of simultaneously searching multiple genes in a short period of time.

Abstract: Provided is a magnetic nanostructure for detecting and isolating cell-free DNA (cfDNA) that including a cationic polymer and a magnetic-nanoparticle-containing conductive polymer. The magnetic nanostructure for detecting and isolating cfDNA according to the subject matter can significantly improve detection and extraction efficiencies of DNA present in a urine, CSF, blood plasma, or blood sample, and exhibits an enhanced sensitivity. Therefore, it is expected that the magnetic nanostructure for detecting and isolating cfDNA according to the subject matter will be used for extracting DNA for use in a genetic mutation diagnosis service as well as for an early cancer diagnosis and cancer treatment.