Application Of Hollow Fiber Ultrafiltration Membrane In Clarification Of Blueberry Juice

In this experiment, wild blueberry fruit as raw material from Daxinganling HeilongjiangProvince, processing conditions enzyme preparation was studied on blueberry juice. The impactof the juice yield on oectinase, cellulase alone and mixing. Determine the optimum process ofMode of action of blueberry juice processing、type enzyme、Add proportion by orthogonalexperiment. Hollow fiber membrane after enzymatic hydrolysis of the blueberry juice furtherclarification and sterilization, affect the application of ultrafiltration technology, product qualityand stability. Optimize the operating conditions of ultrafiltration technology and discusses the gelpolarization generated in the process of ultrafiltration. Dynamics model based on the relationshipbetween the gel membrane resistance polarization. Through research with a view to clarifyingjuice blueberry juice provides a theoretical basis for industrial production.1.The optimum heat treatment blueberry syrup. The results showed,When blanching time isless than2min, juice yield reached a high level, blanching time is the best time of1minblanching time. When blanching time than2min after the juice yield was a significant downwardtrend, because with increasing temperature blanching time causes cell liquid gel reactionoccurred due. And so when blanching2min can make blueberry polyphenol oxidase activitycompletely lost, thus greatly reducing the possibility of the occurrence of juice browning.2. Studied pectinase,cellulase alone on the effect of blueberry juiceclarification,Determining pectinase, cellulase mixing ratio of1:2,Select mixed enzyme dosage,reaction temperature, reaction time, pH4single factor test conditions, By orthogonal experimentaldesign to optimize the process conditions hydrolysis by mixing blueberry juice. The resultingtest concluded that the mixed enzyme dosage0.3g/L, reaction temperature45℃, hydrolysis pH3.5, hydrolysis time120min. Blueberry juice obtained under these conditions was84.82%juice.Soluble solids in vitamin C and other nutrients have been well preserved.3. Polysulfone hollow fiber membrane blueberry juice clarification, Forecasting model onthe basis of single factor, central composite experimental design established operating pressure,liquid flow rate and temperature on membrane flux, Determine the optimum process parameters:temperature35.3℃, operating pressure0.08MPa, liquid flow rate1.3L/min. Under this conditionblueberry juice transmittance reached97.8%, the membrane flux36.59mL/min, significantlyimproved the color of the juice, the juice of total sugar, total acid is not affected significantly.4.To"gellayer resistance"and"osmotic resistance"theory, With blueberry juice flux variationin the ultrafiltration process is based blueberry juice obtained in the ultrafiltration mass transferequations, Also studied the effect of operating pressure on the membrane flux analysis of the main factors causing the ultrafiltration process of mass transfer resistance, based on theoptimization of process parameters on the blueberry juice to explore and establish a system ofultrafiltration mass transfer models. And membrane resistance and concentration polarizationresistance quantitatively described. By blueberry juice ultrafiltration mass transfer studies,regression analysis, Draw blueberry juice ultrafiltration mass transfer equations.