Abstract
Sugar beet molasses is a valuable raw material and it contains high amount of sugar especially sucrose. Therefore, it could be used as substrate for the generation of highly valuable chemicals by microorganisms. Here, considerably high concentrations of molasses were tested for the first time to investigate if they could enhance the growth of Rhodobacter sphaeroides O.U.001 and generations of hydrogen and 5-aminolevulinic acid (5-ALA). Firstly, five distinct growth cultures having sugar contents of 34 g/L, 41 g/L, 48 g/L, 55 g/L and 61 g/L were made ready using molasses. Then, in batch processes, bacterial growth and generations of hydrogen and 5-ALA were investigated in these media. As a result, the highest cell growth (OD660: 9.26, 4.54 g cdw/L) to date was achieved in 34 g/L sugar containing medium. Similarly, the highest quantity of 5-ALA (37.44 mM) to date was attained in the same growth culture. In addition to these significant improvements, at maximum 21.02 mL (0.42 L H2/L) of hydrogen was collected from 34 g/L sugar containing medium. To conclude, using a sugar concentration of 34 g/L yielded the highest bacterial growth and 5-ALA generation so far. And, it also supported the generation of considerable amount of hydrogen.
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