Studies were carried out on ferulic acid esterase production using a culture of Streptomyces S-10. In optimized condition, enzyme yield was 2.0 mU/ml in NUS medium, containing 1.5% de-starched wheat bran at 30 degrees C and initial pH 6.5 under agitated submerged culture. (c) 2005 Elsevier Ltd. All rights reserved.