Selection of Red Raspberry Juice Clarifier and Optimization of Its Clarification Process

Using red raspberry juice as the experimental material,the single factor test of red raspberry juice was performed using five clarifying agents:chitosan,gelatin,PVPP,pectinase and bentonite. Using the transmittance of red raspberry juice as the index,the clarification effect of five clarifiers was compared,and the best clarification conditions of red raspberry juice were selected by orthogonal optimization test. The results showed that in the single-factor test,five clarifiers had a certain degree of clarifying and decolorizing effects on red raspberry juice,chitosan and gelatin had better clarifying effect on red raspberry juice,PVPP and bentonite were the second,and the clarification effect of pectinase was not good. Chitosan had the best clarification effect at a mass concentration of 1.8 g/L,a clarification temperature of 40℃ and a clarification time of 36 h through orthogonal optimization tests and verification tests. A clear,transparent and uniform red raspberry juice with a light transmission of 96.7% was obtained. The process can provide reference for the comprehensive development and utilization of red raspberry resources.