Journal
BIORESOURCE TECHNOLOGY
Volume 112, Issue -, Pages 254-260Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.02.057
Keywords
Lipopeptides; Rice straw; Solid state fermentation; Response surface methodology
Funding
- National Basic Research Program of China [2011CB100503]
- Ministry of Agriculture of China [2011-G27]
- National Department Public Benefit Research Foundation of Ministry of Agriculture of China [201103004]
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This work was aimed to produce lipopeptides by Bacillus amyloliquefaciens XZ-173 in solid state fermentation using agro-industrial byproducts. A central composite design was used to get the highest lipopeptides production. Results revealed that the optimal conditions for maximum lipopeptides production were 1.79% starch and 1.91% yeast extract by employing 5.58 g soybean flour and 3.67 g rice straw as the solid substrate with initial pH 7.5, moisture content 55% and a 10% inoculum level at 30 degrees C for 2 days. Under these conditions, the experimental yield of lipopeptides reached 50.01 mg/gds, which was very close to the predicted value (49.91 mg/gds). At high concentration, the lipopeptides extracted from fermented substrates showed strong antibiotic activity against Rhizoctonia solani and Ralstonia solanacearum and certain emulsification but good emulsion stability. This is the first report on lipopeptides production that uses rice straw as a major substrate. (C) 2012 Elsevier Ltd. All rights reserved.
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