The invention relates to a UCNPs probe-based in-situ
dynamic monitoring molecular
interaction method, which comprises: S1, providing a UCNPs probe, the core layer of the UCNPs probe being a
rare earth up-conversion
nanocrystal, the shell layer of the UCNPs probe being an anti-
quenching inert material, and the anti-
quenching inert material
coating the surface of the
rare earth up-conversion
nanocrystal; the surface of the anti-
quenching inert material is modified with ligand molecules, and the ligand molecules are used for being specifically combined with target molecules in a to-be-detected sample; s2, mixing or contacting the UCNPs probe with a to-be-detected sample containing target molecules to construct a to-be-analyzed molecular interaction
system; s3, irradiating the molecular interaction
system by adopting near-
infrared pulse
laser, and collecting the change of the
fluorescence lifetime tau of the UCNPs along with the time t and the change of the
fluorescence intensity I along with the time t in real time to obtain a tau-t curve and an I-t curve; and S4, according to the tau-t curve and the I-t curve, realizing in-situ
dynamic monitoring on the molecular interaction state. According to the method, a
molecular binding / dissociation event is directly converted into a quantifiable and anti-interference optical
signal, and the technical defect that in-situ
dynamic monitoring of molecular interaction cannot be achieved in a traditional technology is overcome.