Most of the citrus processing plants in Florida producing frozen orange concentrate are now using various types of equipment and processes, which are usually referred to as “pulp washing”, for the water extraction of fruit solids from orange pulp. Such processes, which were added for the first time in some Florida plants during the 1957–58 citrus season, have been adopted extensively during the 1958–59 season because of two reasons, (a) the increase in yield of soluble solids from fruit made possible by the water extraction of orange pulp from juice finishers and (b) the possibility for improving the quality of frozen orange concentrate by substitution of pulp washing procedures for a double juice finishing operation. That an increase in yield results from water extraction of pulp has been definitely established, but the question concerning the effect of such a process on the quality of frozen orange concentrate is still being debated by many persons in the industry.

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