Study On The Production Technology Of Clarification Concentrated Jujube Juice

Red jujube is a good tonic fruit, known as the "nutrition health pill". It contains many kinds of ingredients with nutrional function and high biological activites, such as protein, amino acid, many kinds of vitam and trace element, jujube polysaccharide, total flavonoid, cAMP and so on. At present red jujube juice,jujube wine, jujube vinegar, jujube fruit compound drink, jujube solid drink were producted. In this paper, production technology of clarification concentrated jujube juice was studied.The process of hot water extraction, pectinase extraction, red jujube special enzyme extraction were deterimed. The rate of extraction factors including the amount, reaction time, temperature and the times of watter. The pectinase enzymoly was the best process. The optimum enzymolysis condition was 0.6% adding amount of pectinase, adding 5 times of watter, at 50℃ for 3h, under the optimal preparing condition, the rate of exterction could attain 54.75%.Determine the optimum process with pectinase, chitosan and ZTC1+1-Ⅱ natural clarifying agents for jujube juice. The chitosan optimum process was determined with 1.5% pectinase, pH value 3,30℃ for 80min; The pectinase optimum process was determined with 0.7% pectinase, pH value 3,50℃ for 110min; The optimum process was determined with 0.15% clarifier B for 1 hour and then 0.075% clarifier A was added for another 2 hours,with pH value 3 and the temperature 60℃. ZTC1+1-Ⅱ natural clarifying agents can be used for clarifying jujube juice. The final juice had a transmittance 90.98%. The concentrated jujube juice was determined by 60℃,70r/min vacuum concentration.The final concentrated jujube juice concluded 40.58% total sugar,5.21% total acid, 0.0065% cAMP,0.13% total polysaccharide,1.4% organic acid,0.53% oxalic acid,1.1% tartaric acid,3.2% malic acid,0.6% citric acid,0.6% succinic acid.The jujube was brown, sour and sweet and tasty, and have strong jujube aromawa, storage in 4 ℃.The clarification concentrated jujube juice was extracted by pectinase, clarificated by ZTC1+1-Ⅱ natural clarifying agents, and concentrated.The methods is simpled,with low cost and good stability, also could experimental data for the healthy drinking industry development.