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[Screening of microorganism producing polyunsaturated fatty acids with sugarcane molasses].

A strain name LB1 producing polyunsaturated fatty acids with sugarcane molasses was screened form soil samples by the methods of Sudan Black B stain and the determination of PUFAs' iodine value. Based on the grass morphological and physiological characteristics and the sequence similarity of ribosomal DNA-ITS, the strain was identified as Mucor recurvus sp.. The results of L64 (4(3)) orthogonal experiments indicated when Mucor recurvus was cultivated at 28 degrees C for 5 days with 160 r/min, the yields of PUFAs with 10(0) BX sugarcane molasses (pH 6.0) were up to 80.49% content of total fatty acids. The total lipids content was 57.08% of fermentation biomass, which were composed of 15.42% Oleic acid, 14.38% Linolenic, 23.55% gamma-Linolenic, 3.06% alpha-Linolenic, 9.87% Arachidonic acid, 8.14% Eicosapentaenoic acid, 6.07% Docosahexaenoic acid, etc.