The banana peels were manually removed and immediately immersed in a 1 % potassium metabisulfite solution for 24 h, to inhibit oxidation. Next, they were arranged in aluminum trays and dried in an oven with forced convection at 60 °c for 24 h. The dried peels were then milled in a knife mill (Marconi brand, model MA340, SP-Brazil). The bran was washed with ethanol, to remove lipid fractions, and dried again in an oven at 60 °c for 24 h. The resulting material was sieved through a 200-mesh sieve, which afforded microparticles.