CAROTENOIDS IN JUICE OF SHAMOUTI ORANGE

SUMMARY— More than 50 carotenoids were isolated from the juice of Shamouti orange (Citrus sinensis [L] Osb.) using a combination of column and thin layer chromatography. In addition to carotenoids usually found in citrus, others not previously detected in common orange varieties were identified. These include γ-carotene, rubixanthin, the new ketones sinthaxanthin and its OH-derivative, as well as lutein 5,6-monoepoxide. The dial-polyol fraction was most predominant yielding about 70% of the total carotenoids. It was established that low pigmentation of Shamouti orange juice is due to its low total carotenoid content rather than the absence of colored carotenoids.     

A Laboratory Plate/Screen-Type Electrostatic Separator for Granular Mixtures: Design,Engineering, and Application

The plate/screen-type electrostatic separator presented in this article provides a user-friendly environment for the experimental modeling of existing industrial units and facilitates investigations aiming at identifying new possibilities for using electric field forces for processing mixed granular solids. This multifunctional unit can be equipped with two different active electrodes, which can be energized from one or two independent high-voltage supplies, and the operator has the choice between two types of grounded electrodes: plate and plate/screen. The experiments carried out on a 50% quartz-50% magnetite mixture demonstrate that the efficiency of the separation can be increased by using a grounded plate/screen electrode and two high-voltage electrodes, energized from different supplies.