Studies on Citrus Carotenoids

Part XI. Estimation of blended ratio of juices by the measurement of carotenoid pattern

Abstract

1) Blend juice was produced by the addition of 10, 30, 50% of reconstructed Valencia orange juice(total carotenoids: 0.84mg% and 0.46mg%)to straight Unshiu juice(t.c.: 2.02mg%)and reconstructed Unshiu juice(t.c.: 0.79mg%). Carotenoid pattern of blend juice coincided with the calculated carotenoid pattern when the total carotenoids of both original juices were almost equal. On the other hand, the differences between the calculated pattern and measured pattern was large concomitantly with the increase in the differences in total carotenoids contents between were both original juices.
2) The two carotenoids groups of Dt(total diols)and M(monols)were changed remarkably in the carotenoid patterns of blend juices made by Unshiu juice and Valencia orange juice. When the total carotenoids of both original juices were almost equal, the blended ratio of these original juices could be estimated easily by the measurement of Dt/M value in blend juice.
3) When the total carotenoids and carotenoid pattern were known distinctly, blended ratio of two or three original juices could be estimated by the conditional least-squares method using a computer and this is possible even in the case of different total carotenoids in these juices.
4) These results show that the blended ratio of Unshiu juice and Valencia orange juice are roughly estimated by determining the total catrotenoids, Dt/M value and pulp contents when the total carotenoids and carotenoid pattern of both juices are known distinctly.