Determination of CO2 sensitivity of micro-organisms in shaken bioreactors. II. Novel online monitoring method

Abstract:
In the present study, a new online monitoring method for the determination of the CO2 sensitivity of micro-organisms, based on the values of the respiration factors [OTR (oxygen transfer rate) and CTR (carbon dioxide transfer rate)], obtained by using the RAMOS (respiratory activity monitoring system) device considering a variety of aeration rates in the measuring flask, is investigated. Based on the data of the OTR, obtained by RAMOS under a variety of specific aeration rates, the proposed new method was developed as an online monitoring method for CO2 sensitivity of micro-organisms in shaken bioreactors. A maximum accumulated CO2 concentration of 12% was derived in applied methods, provided that the cultivation system is carried out under optimal conditions. Additionally, to predict these conditions, an unsteady-state gas transfer model in shaken bioreactors would be very advantageous. The data of OTR obtained using the RAMOS device were analysed and recalculated by a programme considering the calibration factor (Cf ). The major advantage of the new method is the possibility to determine the metabolic activity, regardless of manual sampling.

Keywords:
biomass, bioreactor, carbon dioxide, fermentation, ventilation flask, unsteady model.

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