1 23 Biomass Conversion and Biorefinery Processing of Biogenic Material for Energy and Chemistry ISSN 2190-6815 Biomass Conv. Bioref. DOI 10.1007/s13399-013-0090-6 Production and purification of keratinase using chicken feather bioconversion by a newly isolated Aspergillus fumigatus TKF1: detection of valuable metabolites Tanmay Paul, Arpan Das, Arpita Mandal, Suman K Halder, Pradeep K. DasMohapatra, Bikas R. Pati & Keshab C. Mondal