title: Production of lipopeptides by Bacillus amyloliquefaciens XZ-173 in solid state fermentation using soybean flour and rice straw as the substrate.
abstract: 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°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.
authors.affiliation: Jiangsu Key Lab for Organic Solid Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhu
authors.forename: Guoyi
authors.initials: G
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Luo
authors.forename: Wei
authors.initials: W
authors.lastname: Ran
authors.forename: Qirong
authors.initials: Q
authors.lastname: Shen
mesh_terms: D000704:Analysis of Variance; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001407:Bacillus / Q000187:drug effects / Q000378:metabolism*; D002244:Carbon / Q000494:pharmacology; D004655:Emulsions; D005285:Fermentation / Q000187:drug effects / Q000502:physiology*; D005433:Flour; D055666:Lipopeptides / Q000096:biosynthesis*; D009584:Nitrogen / Q000494:pharmacology; D012275:Oryza / Q000737:chemistry*; D013025:Glycine max / Q000737:chemistry*; D013997:Time Factors; D014866:Waste Products / Q000032:analysis*
chemical_list: D000900:Anti-Bacterial Agents; D004655:Emulsions; D055666:Lipopeptides; D014866:Waste Products; D002244:Carbon; D009584:Nitrogen