An approach for estimating the maximum specific growth rate of Gluconobacter japonicus in strawberry puree without cell concentration data

作者：Canete Rodriguez A M; Santos Duenas I M; Jimenez Hornero J E; Torija Martinez M J; Mas A; Garcia Garcia I

来源：Biochemical Engineering Journal, 2016, 105: 314-320.

DOI：10.1016/j.bej.2015.10.005

• Maximum specific growth rate
• Gluconobacter japonicus CECT 8443
• Growth kinetics
• Biokinetics
• Biotransformations
• Batch processing

The estimation of the maximum specific growth rate (mu(max)) for non-readily culturable bacteria, growing on complex media containing suspended solids, is a difficult task considering the important problems in obtaining reliable measures of cell concentration. An example of this situation can be a culture of Gluconobacter japonicus growing in strawberry puree for producing gluconic acid. Based on the dependency between energy requirements of the genus Gluconobacter and substrate uptake as well as its constant relationship between gluconic acid production and total substrate uptake, the total substrate concentration profile during the exponential growth phase could be used for estimating mu(max) without cell concentration measures. In this case, the high selectivity of the strain for glucose in comparison to fructose resulted in no fructose consumption during the batch; so, just using the glucose concentrations data during the exponential phase allow us to obtain an estimation of mu(max). Additionally, a rough estimation of the apparent and stoichiometric yields of cell on glucose is also possible.

• 出版日期2016-1-15