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Biodegradation of 2-chlorobenzoic acid by Klebsiella oxytoca / Isam H. Aljundi in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7159–7167 Titre : Biodegradation of 2-chlorobenzoic acid by Klebsiella oxytoca : mathematical modeling and effect of some growth conditions Type de document : texte imprimé Auteurs : Isam H. Aljundi, Auteur ; Khaled M. Khleifat, Auteur ; Ali M. Khlaifat, Auteur Année de publication : 2010 Article en page(s) : pp. 7159–7167 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Biodegradation Résumé : Klebsiella oxytoca was grown in batch cultures using a 2-chlorobenzoic acid (2-CBA) containing minimal salt medium. 2-CBA was the sole source for carbon and energy.1H NMR and electron-impact mass spectra results suggested an ortho-cleavage pathway of the 2-CBA degradation. An unstructured model with substrate inhibition was successfully applied to the 2-CBA experimental data at different concentrations. The maximum specific growth rate, saturation constant, and substrate inhibition constant were found to be 0.8573 h−1, 10.441 mM, and 50.95 mM, respectively. All carbon sources exhibited different growth kinetics and caused an increase in bacterial growth several times (2−4 fold). Glucose, sorbitol, and fructose at 0.2% concentration, as additional carbon sources, decreased the initial degradation rates of 2-CBA at ranges of 20−70% lower than that of the control. At the same time, lactose, maltose, and sucrose led to the increase in the 2-CBA biodegradation. Nitrogen sources (except l-prolin) caused an inhibition in 2-CBA degradation by 55, 60, and 33% for yeast extract, casein, and trypton, respectively. The data showed that different initial (inocula) densities affected the induction time for 2-CBA degradation and resulted in the different degradation rates by concentration-dependent manner. 2-CBA degradation was optimally achieved at a 37 °C incubation temperature and a pH of 7.0. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100964f [article] Biodegradation of 2-chlorobenzoic acid by Klebsiella oxytoca : mathematical modeling and effect of some growth conditions [texte imprimé] / Isam H. Aljundi, Auteur ; Khaled M. Khleifat, Auteur ; Ali M. Khlaifat, Auteur . - 2010 . - pp. 7159–7167. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7159–7167 Mots-clés : Biodegradation Résumé : Klebsiella oxytoca was grown in batch cultures using a 2-chlorobenzoic acid (2-CBA) containing minimal salt medium. 2-CBA was the sole source for carbon and energy.1H NMR and electron-impact mass spectra results suggested an ortho-cleavage pathway of the 2-CBA degradation. An unstructured model with substrate inhibition was successfully applied to the 2-CBA experimental data at different concentrations. The maximum specific growth rate, saturation constant, and substrate inhibition constant were found to be 0.8573 h−1, 10.441 mM, and 50.95 mM, respectively. All carbon sources exhibited different growth kinetics and caused an increase in bacterial growth several times (2−4 fold). Glucose, sorbitol, and fructose at 0.2% concentration, as additional carbon sources, decreased the initial degradation rates of 2-CBA at ranges of 20−70% lower than that of the control. At the same time, lactose, maltose, and sucrose led to the increase in the 2-CBA biodegradation. Nitrogen sources (except l-prolin) caused an inhibition in 2-CBA degradation by 55, 60, and 33% for yeast extract, casein, and trypton, respectively. The data showed that different initial (inocula) densities affected the induction time for 2-CBA degradation and resulted in the different degradation rates by concentration-dependent manner. 2-CBA degradation was optimally achieved at a 37 °C incubation temperature and a pH of 7.0. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100964f