Application of atmospheric and room-temperature plasma mutagenesis strain in resisting post-acidification of yoghourt

The invention discloses application of an atmospheric and room-temperature plasma and neomycin combined mutagenesis strain in resisting post-acidification of yoghourt. Through screening of mutagenesis strains and verification tests on the growth characteristics, strain acid resistance activity and post-acidification resistance of the mutagenesis strain, the H-ATP enzyme activity of the mutagenesis strain is lower than that of an original strain, wherein the minimum H-ATP enzyme activity of the mutagenesis strain is 0.57 U/mg; the mutagenesis strain is inoculated into whole milk, the pH value and acidity of fermented milk are measured, the pH change of a control group is maximum, the decrease trend is slowed down after 10 days, the change amplitude of the strain BJT-7 is minimum, and no rapid decrease period occurs; the strain BJT-7 is subjected to continuous subculture in an MRS culture medium for 5 generations and is stored for 6 days at 12 DEG C, and the pH and titration acidity of the strain BJT-7 st