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Statements

Subject Item
n2:RIV%2F70883521%3A28610%2F14%3A43871925%21RIV15-MSM-28610___
rdf:type
n5:Vysledek skos:Concept
dcterms:description
The biodegradation of four poly(l-lactic acid) (PLA) samples with molecular weights (MW) ranging from approximately 34 to 160kgmol-1 was investigated under composting conditions. The biodegradation rate decreased, and initial retardation was discernible in parallel with the increasing MW of the polymer. Furthermore, the specific surface area of the polymer sample was identified as the important factor accelerating biodegradation. Microbial community compositions and dynamics during the biodegradation of different PLA were monitored by temperature gradient gel electrophoresis, and were found to be virtually identical for all PLA materials and independent of MW. A specific PLA degrading bacteria was isolated and tentatively designated Thermopolyspora flexuosa FTPLA. The addition of a limited amount of low MW PLA did not accelerate the biodegradation of high MW PLA, suggesting that the process is not limited to the number of specific degraders and/or the induction of specific enzymes. In parallel, abiotic hydrolysis was investigated for the same set of samples and their courses found to be quasi-identical with the biodegradation of all four PLA samples investigated. This suggests that the abiotic hydrolysis represented a rate limiting step in the biodegradation process and the organisms present were not able to accelerate depolymerization significantly by the action of their enzymes. The biodegradation of four poly(l-lactic acid) (PLA) samples with molecular weights (MW) ranging from approximately 34 to 160kgmol-1 was investigated under composting conditions. The biodegradation rate decreased, and initial retardation was discernible in parallel with the increasing MW of the polymer. Furthermore, the specific surface area of the polymer sample was identified as the important factor accelerating biodegradation. Microbial community compositions and dynamics during the biodegradation of different PLA were monitored by temperature gradient gel electrophoresis, and were found to be virtually identical for all PLA materials and independent of MW. A specific PLA degrading bacteria was isolated and tentatively designated Thermopolyspora flexuosa FTPLA. The addition of a limited amount of low MW PLA did not accelerate the biodegradation of high MW PLA, suggesting that the process is not limited to the number of specific degraders and/or the induction of specific enzymes. In parallel, abiotic hydrolysis was investigated for the same set of samples and their courses found to be quasi-identical with the biodegradation of all four PLA samples investigated. This suggests that the abiotic hydrolysis represented a rate limiting step in the biodegradation process and the organisms present were not able to accelerate depolymerization significantly by the action of their enzymes.
dcterms:title
Identification of important abiotic and biotic factors in the biodegradation of poly(l-lactic acid) Identification of important abiotic and biotic factors in the biodegradation of poly(l-lactic acid)
skos:prefLabel
Identification of important abiotic and biotic factors in the biodegradation of poly(l-lactic acid) Identification of important abiotic and biotic factors in the biodegradation of poly(l-lactic acid)
skos:notation
RIV/70883521:28610/14:43871925!RIV15-MSM-28610___
n3:aktivita
n12:S n12:P
n3:aktivity
P(ED2.1.00/03.0111), P(GAP108/10/0200), S
n3:cisloPeriodika
Neuveden
n3:dodaniDat
n8:2015
n3:domaciTvurceVysledku
n16:3917436 n16:4469143 n16:3382257
n3:druhVysledku
n13:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
20289
n3:idVysledku
RIV/70883521:28610/14:43871925
n3:jazykVysledku
n9:eng
n3:klicovaSlova
Polylactic acid; Biodegradation; Abiotic hydrolysis
n3:klicoveSlovo
n10:Biodegradation n10:Abiotic%20hydrolysis n10:Polylactic%20acid
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[03E4FF125438]
n3:nazevZdroje
International Journal of Biological Macromolecules
n3:obor
n18:JJ
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
8
n3:projekt
n15:ED2.1.00%2F03.0111 n15:GAP108%2F10%2F0200
n3:rokUplatneniVysledku
n8:2014
n3:svazekPeriodika
71
n3:tvurceVysledku
Koutný, Marek Stloukal, Petr Verney, Vincent Ramone, Audrey Kucharczyk, Pavel Pekařová, Silvie Husárová, Lucie Commereuc, Sophie
s:issn
0141-8130
s:numberOfPages
8
n19:doi
10.1016/j.ijbiomac.2014.04.050
n11:organizacniJednotka
28610