Ammonium Phosphate as a Sole Nutritional Supplement for the Fermentative Production of 2,3-Butanediol from Sugar Cane Juice

Abstract

The production of 2,3-butanediol by Klebsiella pneumoniae from sugar cane juice supple mented with different salts was studied. This microorganism is able to degrade sucrose pre sent in sugar cane juice containing ammonium phosphate as the sole nutritional supplement. With a sugar cane juice-based medium containing ~180 g sucrose /1 and 8.0 g (NH4)2H P04, / 1, over 70 g 2,3-butanediol plus acetoin / 1 were formed. This result is comparable to that achieved with a sugar cane juice-based medium containing several nutrients, although the kinetic profiles of these runs presented significant differences. With the ammonium phosphate-enriched medium, cell growth was initially favoured by both the strong oxygen supply and the higher water activity due to the lower concentration of nutrients. After 14 h, the limitation in some nutrients led to the interruption of cell growth, and decreasing rates for product formation and substrate consumption were observed. During the stationary phase of this run, sucrose was preferentially converted to product, and the substrate was completely depleted after 35 h of the process. With the complete medium, the substrate was totally consumed after 36 h of run. In this case, the higher initial concentration of nutrients reduced the overall process rate but sustained the cell growth for 27 h. Conversion yields of 0.40 g product / g sucrose and productivities close to 2.0 g/ lxh were obtained under both conditions.

Production of 2,3-Butanediol from Sucrose by a Klebsiella Species

“…Meanwhile, the final ethanol concentration through this fed-batch strategy reached 22.5 g/L, which will further add to the economic value of the process. In all, the final solvent (2,3-butanediol and ethanol) accumulated to 141.9 g/L with a final productivity and yield of 2.18 g/L/h and 0.47 g/g, which is higher than those in previous studies [16][17][18][19][20][21] and only 8.1 g/L less than that of the so far reported highest 2,3-butanediol production, where glucose was used as the substrate [22]. In all, the data here represented the highest 2,3-butanediol bio-production using sucrose as the sole carbon source.…”

“…The production of 2,3-butanediol and ethanol increased sharply with the rapid growth of the mutant strain, indicating that the production of 2,3-butanediol is associated with the cell growth. After 65 h of fermentation, the 2,3-butanediol concentration reached up to 119.4 g/L, which is 1.3-fold higher than that (91.2 g/L) of the wild strain and 1.7-fold higher than that (70 g/L) of other Klebsiella strain when fermenting sucrose [16]. This correlated with the corresponding 1.83 g/L/h and 0.40 g/g of 2,3-butanediol productivity and yield [16][17][18][19][20][21].…”