Abstract: This paper compares the quality of orange juice from three cultivars, Beipei 447, Zhongyu 7 and Wuhexuegan produced by two different concentrated orange juice production lines, FMC medium and lab-simulated production lines with the aim of selecting the better of the production lines. The results showed that the Beipei 447, Zhongyu 7 and Wuhexuegan concentration orange juices produced by the industrial production line exhibited 4.78-, 3.81-, and 3.39-fold increases in limonin content when compared with the corresponding fresh juices. By contrast, 2.78-, 2.48-, and 2.32-fold increases in limonin content were observed for Beipei 447, Zhongyu 7 and Wuhexuegan concentration orange juices produced by the lab-simulated production line. Squeezing and homogenization in the production lines had little effect on the quality of concentrated orange juice. The sterilization and concentration modes used in the lab-simulated production line were more conducive to increasing the quality of concentrated orange juice.

Key words: concentrated orange juice, unit operation, production line, quality