Reduction of aflatoxin B1 in peanut meal by extrusion cooking

This study explored the feasibility of degrading aflatoxin B-1 (AFB(1) in contaminated peanut meal by extrusion cooking. Peanut meal contaminated with AFB(1) (35.8 +/- 15 mu/kg) was extrusion-cooked in a twin-screw extruder and AFB(1) was quantified by ELISA. The effects of barrel temperature, material moisture content, feed rate, and screw speed as well as their interactions on the reduction rate of AFB(1) in peanuts meal were evaluated by Response surface methodology (RSM) to optimize the extrusion conditions. Under the optimal conditions (barrel temperature of 150 degrees C, material moisture content of 40 g/100 g, feed rate of 17 g/min, and screw speed of 152 rpm), 77.6 +/- 2.2% of AFB(1) was degraded. The barrel temperature and material moisture have significant influences (P < 0.01) on the degradation rate of AFB(1), while the feed rate or screw speed has no significant influence. (C) 2015 Elsevier Ltd. All rights reserved.