Preparation method of low-lactose dairy product rich in honey pomelo fiber

A preparation method of a low-lactose dairy product rich in honey pomelo fiber, comprising the following steps:

• (1) washing, cutting and debitterizing peels of honey pomelos to obtain honey pomelo fiber pieces, and freezing the honey pomelo fiber pieces;
• (2) sterilizing and cooling a milk solution, and performing a first-round of fermentation on the milk solution by inoculating lactic acid bacteria until a lactose content is not reduced anymore;
• curding and centrifuging the milk solution, then collecting precipitates;
• adding water to the precipitates to make the pH value over 5.0, followed by a homogenizing treatment to obtain a first-round fermented milk;
• (3) mixing the honey pomelo fiber pieces with the first-round fermented milk, performing a second-round fermentation on the first-round fermented milk and honey pomelo fiber pieces mixture by inoculating lactic acid bacteria until the lactose content is lower than 0.04% wt/vol;
• or performing a second-round fermentation on the first-round fermented milk by inoculating the first-round fermented milk with lactic acid bacteria until the lactose content is lower than 0.04% wt/vol to obtain a second-round fermented milk, and then mixing the second-round fermented milk with the honey pomelo fiber pieces;
• wherein a mixing method for mixing the honey pomelo fiber pieces with the first-round fermented milk comprises infiltration;
• and
• (4) performing vacuum freeze-drying to obtain dairy products with a lactose content lower than 0.04% wt/vol and having honey pomelo fiber.