Abstract
ABSTRACTSoluble solids (SS) recovered by countercurrent washing of citrus juice pulp are concentrated by evaporation and sold primarily for use in beverage bases and other food uses. On a pilot plant scale, treatment of the finisher pulp with pectolytic enzymes resulted in increasing the yield of recoverable SS from 65–80 kg SS/ton pulp (oranges) and from 45–50 kg SS/ton (grapefruit). High viscosity of pulp‐wash liquids and other citrus processing liquids was found to be a deterrent during concentration by evaporation. Enzyme‐treated liquids were concentrated in a medium‐temperature evaporator to over 70° Brix and relative viscosities in the range of 1700–2200 centipoises; however, due to gel formation, nontreated liquids had to be pumped out of the evaporator at 25–35° Brix with a relative viscosity of over 20,000 centipoises. Careful use of enzyine to increase SS yields or lower viscosity during pulpwashing did not adversely affect the °Brix, acid, pH or clouding ability of the concentrated pulp‐wash.
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