The Study Of Production Technology Of Black Tea Concentrate

Tea concentrated solution storage has many advantages such as low cost,convenient use,and because of the use of the deployment process is convenient,low technical threshold,greatly reduce the construction cost of beverage production enterprises,by the beverage production enterprises welcome,the market prospect is broad.Black Tea concentrated solution mainly takes a total of four key processes:raw materials,hot water extraction,dissolved clarification and membrane.This paper starting from the actual production in the pilot scale experimental effect on the key process and the factors affecting the trend.And the optimized result is obtained as follows:First of all,in the selection of raw materials,through the domestic link Dianhong and Sri Lanka,Keemun Black Tea three kinds of production of raw materials,tea polyphenols,theaflavins,thearubigins and comparison of theabrownin and other biochemical components and color index,found in Sri Lanka red,with quality content high,good quality and appearance characteristics,especially as for Black Tea concentrated solution of raw materials,while the other two kinds of raw materials required by proper blending can improve the applicability of the production as raw materials.Secondly,in the heat extraction process,through the orthogonal experiment of temperature leaching process were studied,polyphenols,time and pH variables of tea caffeine,thearubigins,theabrownins,theaflavins quality components affect the digestion rate,with the increase of temperature,time,tea polyphenols,tea theabrownine(TB)showed a rising trend,thearubigins(TR)and theaflavins(TF)at a certain temperature,its content with the time increased initially and then decreased.And the yield of solution and tea flavor remain as the optimization goal,the key factors were optimized.The results show that the extraction of pH value 7.0,extraction temperature 85,extraction time 15min leaching parameters is optimal.Then,in the progress of dissolved clear,by compounding on tannase and pectinase used to solve the "cold tea mixed problem,the optimized parameters for tannase addition 0.2%,pectinase 1.0%,hydrolysis time 60min,hydrolysis temperature 30?35?.Enzymolysis pH range of 5.0?5.5,in addition,the retention rate and soluble tea milk contact removal rate analysis shows that the condensation temperature of 15?,concentrate the clarity and stability of the best.Finally,in the progress of membrane concentration,used in high-end concentrated juice production commonly used RO reverse osmosis membrane technology,and considering the production efficiency and sensory quality,complete parameter optimization results show that the optimum RO membrane concentration parameters:the temperature is 40?,the pressure is 2.0?2.5MPa.The results of the study in the pilot scale production and application results showed that the production process has the advantages of low temperature extraction technology,simple production process,product quality has the maximum retention of tea juice flavor,anti settling ability,and can be dissolved.