Apple flavor yeast culture as well as preparation method and application thereof

The invention belongs to the technical field of fermentation, and particularly relates to a preparation method of an apple-flavor yeast culture and application of the yeast culture. The preparation method of the yeast culture comprises the following steps: (1) mixing and crushing soybean meal and corn bran to serve as a base material for later use; (2) preparing kluyveromyces marxianus fermentation liquor; (3) supplementing the mannobiose trisaccharide hydrolysate into the kluyveromyces marxianus fermentation liquor, uniformly mixing, and inoculating into the base material; and (4) carrying out aerobic shallow fermentation on the inoculated base material to obtain the yeast culture after the fermentation is finished. According to the invention, Kluyveromyces marxianus is used as a fermentation strain for solid-state fermentation, and the mannobiose trisaccharide hydrolysate is used as a carbon source, so that the prepared yeast culture has high viable count, and a wet material after fermentation has apple fra