IN-VITRO BINDING OF BENZO[A]PYRENE BY EXTRUDED POTATO PEELS

The effects of extrusion conditions on binding of the dietary carcinogen benzo[a]pyrene [B(a)P] were determined using an in vitro digestion model followed by HPLC with fluorescence detection. Extrusion at 110 degrees C and 30% feed moisture resulted in significantly less binding than did nonextruded peels (77% vs 84%), but other conditions did not affect binding. Peels bound more B(a)P than did wheat bran, cellulose, or arabinogalactan. B(a)P dosage was inversely related to the percentage bound. A model system containing cellulose with chlorogenic acid bound all B(a)P added, compared with only 66% by cellulose alone and 32% by a cellulose-quercetin mixture.