Set-style fermented yoghourt rich in probiotics and preparation method of yoghourt

Abstract

The invention discloses set-style fermented yoghourt rich in probiotics and a preparation method of the set-style fermented yoghourt. The method comprises the steps of adding a fermenting agent and a thickening agent into sterilized raw milk to form a feed liquid, and obtaining the yoghourt through fermentation, wherein the fermentation step adopts a two-stage combination fermentation process, and the process comprises two steps of performing middle-temperature fermentation at 30-37 DEG C for 3-6 hours in the front stage and performing hot fermentation at 42-45 DEG C for 1-3 hours in the back stage. The fermenting agent is a direct vat set fermenting agent, which includes lactobacillus bulgaricus, streptococcus thermophilus and probiotics; the inoculation quantities of the lactobacillus bulgaricus subsp. bulgaricus and streptococcus thermophilus are 1.0*10<6>-9.9*10<6>CFU / mL; the inoculation quantity of each of probiotics is 1.0*10<5>-9.9*10<5>CFU / mL. In the yoghourt prepared by the method disclosed by the invention, the viable bacteria count ratio of the probiotics is more than 1-3 orders of magnitude than that of the yoghourt prepared by the traditional fermentation method, and the quantity of the viable bacteria of the probiotics can reach 10<7>-10<9>CFU / mL.

Description

technical field [0001] The invention belongs to the field of food, in particular to a coagulated fermented yoghurt rich in probiotics and a preparation method thereof. Background technique [0002] Probiotics usually refer to a mixture of single or specific microorganisms that can promote human or animal health by ingesting a certain amount and reaching the gastrointestinal tract in the state of live bacteria. Probiotics and their metabolites , can regulate the intestinal micro-ecological balance, achieve the purpose of disease prevention, health care and longevity, and at the same time, probiotics have a strong inhibitory effect on the growth of other harmful bacteria. Studies have shown that probiotics have a variety of promoting effects on human health, such as improving the balance of human intestinal microbial flora, enhancing the body's immunity, lowering cholesterol levels, alleviating lactose intolerance, and inhibiting the formation of tumor cells. In addition to t...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the present invention aims at the fact that the optimal growth temperature of Lactobacillus delbrueckii subsp.bulgaricus and Streptococcus thermophilus in the starter of conventional fermented yogurt is different from that of probiotics, and adopts conventional 42-45 °C fermentation temperature, the rapid proliferation of Lactobacillus delbrueckii subsp. Bulgaricus and St. thermophilus will inhibit the growth of probiotic strains, resulting in insufficient number of viable probiotic bacteria in the product. Or in order to increase the number of viable probiotic bacteria in the product, the inoculum amount of probiotic bacteria has to be increased, thereby increasing the production cost. A method for preparing set yogurt and the yogurt prepared therefrom are provided.

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