Akademik Veri Yönetim Sistemi
PREPARATIVE BIOCHEMISTRY & BIOTECHNOLOGY, cilt.44, sa.4, ss.332-341, 2014 (SCI-Expanded)
Considering the vast number of scientific reports on various potential uses of fungi, there was an attempt to select the best lipid producer of some fungi at optimized conditions (Aspergillus versicolor, Rhizopus oryzae, Rhizopus arrhizus, Tramates versicolor). The aim was to offer new fields of use to the industries already culturing and using such materials. Aspergillus versicolor mycelia were found to be accumulating the highest amount of lipids. Experiments to improve lipid accumulation and transesterification properties were performed in molasses medium; the first steps were testing the effects of different pH values and different nitrogen sources on lipid accumulation. Various concentrations of KNO3 (0.5, 1.0, 1.5gL(-1)) and molasses (6%, 8%, 10%) were tried in order to find the optimum carbon and nitrogen requirements. Maximum lipid content was 22.8% in the samples containing 6% molasses solution and 1.0gL(-1) KNO3 at pH 4 after 10 days of incubation. The highest fatty acid ethyl ester yield of these samples was 77% (5.0 ethanol:oil, 0.4 sulfuric acid:oil at 30 degrees C for 6hr). Since the crude lipids were rich in C16 and C18 fatty acids, this was considered as suitable feedstock for biodiesel production.