Growth and laccase production kinetics ofTrametes versicolorin a stirred tank reactor

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Abstract

White rot fungi are a promising option to treat recalcitrant organic molecules, such as lignin, polycyclic aromatic hydrocarbons, and textile dyes, because of the lignin-modifying enzymes (LMEs) they secrete. Because knowledge of the kinetic parameters is important to better design and operate bioreactors to cultivate these fungi for degradation and/or to produce LME(s), these parameters were determined using Trametes versicolor ATCC 20869 (ATCC, American Type Culture Collection) in a magnetic stir bar reactor. A complete set of kinetic data has not been previously published for this culture. Higher than previously reported growth rates with high laccase production of up to 1,385 U l-1 occurred during growth without Symbol or glucose limitation. The maximum specific growth rate averaged 0.94 ± 0.23 day-1, whereas the maximum specific substrate consumption rates for glucose and ammonium were 3.37 ± 1.16 and 0.15 ± 0.04 day-1, respectively. The maximum specific oxygen consumption rate was 1.63 ± 0.36 day-1.

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