Readily processed clear fruit juices contain variable amounts of collo
idally dissolved pectic substances. Separation of fruit juice polysacc
harides by anion-exchange-chromatography yielded mainly arabinogalacta
ns (type II) and rhamnogalacturonans. The addition of small amounts of
the residual pectins to colloid free juices resulted in a up to 60 %
reduction of the flux rates in micro- and ultrafiltration systems.