title: Influence of phenolic substrates utilised by yeastTrichosporon cutaneumon the degradation kinetics.
abstract: The degradation kinetics of different phenolic substrates utilised byTrichosporon cutaneumR57 was studied. The following compounds were used as substrates:phenol, resorcinol, hydroquinone, 3-nitrophenol, 2,6-dinitrophenol, 3-chloro phenol andp-cresol. The specific degradation rates (Qs) were described by a Haldane kinetic model. The unknown model parameters were estimated using the mathematical optimisation procedure for direct search. The results obtained demonstrated thatQsvaried greatly in the experiments carried out. The level of biodegradability depended on the different structure and toxicity of compounds used as carbon substrates. The highestQsvalues were observed for less toxic hydroxylated phenols (0.77-0.85 h-1), while the most toxic chlorinated phenols were characterised with the lowestQsvalues (0.224 h-1). The results obtained with different concentrations of resorcinol (from 0.2 to 0.8 g L-1) and 2,6-dinitrophenol (from 0.2 to 0.7 g L-1) demonstrated a growing inhibitory effect directly correlating with the extended time necessary for complete degradation of both compounds.
authors.affiliation: Bulgarian Academy of Sciences, Institute of Microbiology , Sofia , Bulgaria.
authors.forename: Maria
authors.initials: M
authors.lastname: Gerginova
authors.affiliation: Bulgarian Academy of Sciences, Institute of System Engineering and Robotics , Sofia , Bulgaria.
authors.forename: Plamena
authors.initials: P
authors.lastname: Zlateva
authors.affiliation: Bulgarian Academy of Sciences, Institute of Microbiology , Sofia , Bulgaria.
authors.forename: Nadejda
authors.initials: N
authors.lastname: Peneva
authors.affiliation: Bulgarian Academy of Sciences, Institute of Microbiology , Sofia , Bulgaria.
authors.forename: Zlatka
authors.initials: Z
authors.lastname: Alexieva
keywords: biodegradation; kinetic parameters; phenol; phenol derivatives; yeast