The invention discloses a method for realizing visual
nucleic acid testing by composite magnetic beads and relates to the technical field of
nucleic acid testing. The method comprises steps as follows:
proteinase K is added to a to-be-tested sample, a lysate and extracting magnetic beads are added and mixed uniformly for a reaction, then the magnetic beads are adsorbed in a magnetic environment, acleaning solution is added, uniform mixing is carried out, the magnetic beads are re-suspended and adsorbed magnetically, liquid is removed, and after
drying is performed, the magnetic beads are re-suspended by an eluent; an isothermal amplification reaction solution and a
biotin modified primer are added, isothermal amplification is carried out, and an amplification product is obtained;
amplicon-targetedly-enriching magnetic beads modified with
avidin and FAM-
DNA-NH2-
fluorescence probe magnetic beads are added,
amplicon magnetic beads are formed after incubation, the magnetic beads are magnetically adsorbed, a supernatant is removed, and mixed magnetic beads are obtained by
drying; and a Cas12a+crRNA premixed solution is added, re-suspending is carried out, and after a reaction, the magnetic beads are magnetically adsorbed, and observation is performed under
blue light. According to the method,
nucleic acid extraction, amplification and detection are completed in a tube, reaction solutions of different conditions are replaced in the processes, free switching of different reaction systems can be realized by extraction samples, primers and probes combined on the magnetic beads, andtherefore, the accurate qualitative detection is completed.