The invention relates to a preparation method of a
black tea concentrated solution. The method includes the steps that firstly, tea leaves are extracted, wherein after
tea leaf raw materials are thrown in, RO water at the temperature of 70-95 DEG C is added, and the
tea leaf raw materials are extracted; secondly, enzymolysis reaction is performed, wherein
tannase, lyticase,
amylase and
protease are sequentially added,
enzymatic hydrolysis reaction lasts for 4-8 hours, and then circumscribed
protease is added; thirdly, separation and
filtration are performed; fourthly, the pH value of a
black tea extracting solution is adjusted, NaHCO3 is added in the
black tea extracting solution, the pH value is adjusted to be 5.0-6.0, and a black tea solution is obtained; sixthly, the black tea concentrated solution is obtained after concentration. The method takes the black tea leaves as raw materials, water serves as solvents in the whole production process, a unique enzymolysis technology is adopted,
enzyme preparations can play the maximum application effect, the yield of the product is increased, taste components become richer, the sweet feeling is improved when the black tea concentrated solution enters the mouth, the
sweetness after taste is improved, the characteristic
flavor of black tea is reserved, and the black tea concentrated solution has tea feeling, and is natural
plant extracts and is a high added-value product.