Abstract
Acid precipitation was examined in the recovery of pectin from acidic- and alkaline waste fluids from satsuma mandarin (Citrus Unshiu Marc.) cannery. In the alkaline waste fluid, the most desirable precipitation was obtained at pH 1.8, and the recovery yield was about 90%. The higher the pectin concentration in alkaline waste fluid, the higher the recovery yield was. The acidic waste fluid was demethylated with sodium hydroxide prior to acid precipitation, and the most successful recovery yield was obtained at the same pH level. It was found that acid precipitation is much more suitable than ethanol- or calcium precipitation.
