Izolacija i selekcija mikroalgi za proizvodnju ulja
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Abstract
Proizvodnja biodizela privlači sve veću pažnju istraživača poslednjih godina. Trenutna komercijana proizvodnja biodizela uključuje transesterifikaciju ulja dobijenog iz uljarica. Kako imaju veliku brzinu rasta, visok sadržaj ulja, a mogu se gajiti u sredinama nepovoljnim za rast biljnih vrsta, mikroalge predstavljaju dobru alternativu za proizvodnju ulja. Pored toga, gajenje mikroalgi doprinosi i zaštiti životne sredine u smislu smanjenja sadržaja ugljen-dioksida u atmosferi. U cilju proučavanja mogućnosti gajenja mikroalgi za proizvodnju ulja, izvršena je izolacija i identifikacija 6 sojeva slatkovodnih mikroalgi iz stajaćih voda u okolini Leskovca. Utvrđeno je da mikroalge pripadaju rodovima Chlorococcum, Chlorella, Desmodesmus i Scenedesmus. Izolati su, zatim gajeni u laboratorijskim, kontrolisanim uslovima uz određivanje brzine rasta, produktivnosti biomase i sadržaja ulja. Najveći sadržaj suve biomase utvrđen je kod sojeva Chlorococcum sp. i Desmodesmus sp.1 (1,5 g/dm3), dok se sadržaj ulja kretao u opsegu od 15,8% (Chlorococcum sp.) do 33% (Chlorella sp.). Kako je najveća produktivnost ulja utvrđena kod mikroalgi Chlorella sp. i Scenedesmus sp., ova dva izolata su najpogodnija za dalja proučavanja u cilju poboljšanja prinosa ulja i mogućnosti upotrebe u procesu proizvodnje biodizela.
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