caa a22 4500 467886415 CHVBK 20180406152735.0 cr unu---uuuuu 170328e20060701xx s 000 0 eng 10.1007/s10924-006-0022-7 doi (NATIONALLICENCE)springer-10.1007/s10924-006-0022-7 Degradation of Poly(3-hydroxybutyrate) and Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) by Some Soil Aspergillus spp [Elektronische Daten] [Puspita Sanyal, Parama Samaddar, A. Paul] Systematic screening of 45 soil fungi for degradation polyhydroxyalkanoic acids (PHAs) has led to the selection of 6 potent Aspergillus isolates belonging to A. flavus, A. oryzae, A. parasiticus, and A. racemosus. Degradation of PHAs as determined by tube assay method revealed that these Aspergillus spp. were more efficient in degrading poly(3-hydroxybutyrate) [P(3HB)] compared to copolymer of 3-hydroxybutyric acid and 3-hydroxyvaleric acid (P3HB-co-16% 3HV). Moreover, the extent of degradation in mineral base medium was much better than those in complex organic medium. For all the Aspergillus spp. tested, maximum degradation was recorded at a temperature of 37°C with significant inhibition of growth. The optimum pH range for degradation was 6.5-7.0 with degradation being maximum at pH6.8. The extent of polymer degradation increased with increase in substrate concentration, the optimum concentration for most of the cultures being 0.4% and 0.2% (w/v) for P(3HB) and P(3HB-co-16%3HV) respectively. Supplementation of the degradation medium with additional carbon sources exerted significant inhibitory effect on both P(3HB) and P(3HB-co-16%3HV) degradation. Springer Science+Business Media, Inc., 2006 Polyhydroxyalkanoate nationallicence Poly(3-hydroxybutyrate) nationallicence Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) nationallicence Biodegradation nationallicence Fungi nationallicence Aspergillus nationallicence Sanyal Puspita Microbiology Laboratory, Department of Botany, University of Calcutta, 700 019, Kolkata, India aut Samaddar Parama Microbiology Laboratory, Department of Botany, University of Calcutta, 700 019, Kolkata, India aut Paul A. Microbiology Laboratory, Department of Botany, University of Calcutta, 700 019, Kolkata, India aut Journal of Polymers and the Environment Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 14/3(2006-07-01), 257-263 1566-2543 14:3<257 2006 14 10924 https://doi.org/10.1007/s10924-006-0022-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10924-006-0022-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sanyal Puspita Microbiology Laboratory, Department of Botany, University of Calcutta, 700 019, Kolkata, India aut NATIONALLICENCE 700 1- Samaddar Parama Microbiology Laboratory, Department of Botany, University of Calcutta, 700 019, Kolkata, India aut NATIONALLICENCE 700 1- Paul A. Microbiology Laboratory, Department of Botany, University of Calcutta, 700 019, Kolkata, India aut NATIONALLICENCE 773 0- Journal of Polymers and the Environment Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 14/3(2006-07-01), 257-263 1566-2543 14:3<257 2006 14 10924 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer