Abstract
A nonstructured model has been developed to describe the CO 2 emission during growth of Geotrichum candidum on a lactate + peptone-based liquid medium. From the nitrogen and carbon mass balances, it was shown that about 50% of the total CO 2 released was from the metabolism of the energy supply for biosynthesis, and the remaining from that for maintenance; thus, CO 2 production was considered to be partially associated with growth. The model fitted the experimental data as long as a net growth was observed (0–50 h). The coefficients for growth- and non-growth-associated CO 2 production were A=0.646 (dimensionless) and B=0.017 h −1, respectively. From the coefficients of the model and the CO 2 history data, the biomass kinetics has been reconstructed, and the calculated biomass concentrations agree fairly well with the experimental data. From this, measurement of the CO 2 evolved may be used as an indirect and non-intrusive method of monitoring fungal growth during the first 50 h of cultivation.
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