Document Detail

Screening of microorganisms for biodegradation of poly(lactic-acid) and lactic acid-containing polymers.
MedLine Citation:
PMID:  8779578     Owner:  NLM     Status:  MEDLINE    
The ability of some microorganisms to use lactic acid stereocopolymers and copolymers with glycolic acid as sole carbon and energy sources was studied under controlled or natural conditions. First, 14 filamentous fungal strains were tested in liquid cultures, adopting total lactic acid consumption, nitrogen source exhaustion, and maximal biomass production as selection criteria. Two strains of Fusarium moniliforme and one strain of Penicillium roqueforti were able to totally assimilate DL-lactic acid, partially soluble racemic oligomers (MW = 1,000), and the nitrogen source. Only one strain of F. moniliforme was able to grow on a poly(lactic acid)-glycolic acid copolymer (MW = 150,000) after 2 months of incubation at 28 degrees C on synthetic agar medium. Mycelium development was examined by scanning electron microscopy. F. moniliforme filaments were observed to grow not only at the copolymer surface but also through the bulk of the copolymer. In a second approach, plates made of a racemic poly(lactic acid) were buried in the soil before being incubated in petri dishes containing mineral agar medium under controlled conditions. Five strains of different filamentous fungi were isolated, and their ability to assimilate racemic poly(lactic acid) oligomers was tested in liquid cultures.
A Torres; S M Li; S Roussos; M Vert
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  62     ISSN:  0099-2240     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  1996 Jul 
Date Detail:
Created Date:  1996-09-19     Completed Date:  1996-09-19     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2393-7     Citation Subset:  IM    
Laboratory of Biotechnology, Institut Français de Recherche Scientifique pour le Développment en Coopération, Montpellier, France.
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MeSH Terms
Biodegradation, Environmental
Fungi / growth & development,  metabolism*,  ultrastructure
Fusarium / growth & development,  metabolism,  ultrastructure
Lactates / metabolism*
Lactic Acid*
Microscopy, Electron, Scanning
Penicillium / growth & development,  metabolism
Polyglycolic Acid*
Polymers / metabolism*
Soil Microbiology
Soil Pollutants / metabolism
Reg. No./Substance:
0/Lactates; 0/Polymers; 0/Soil Pollutants; 0/polylactic acid-polyglycolic acid copolymer; 26009-03-0/Polyglycolic Acid; 26100-51-6/poly(lactic acid); 50-21-5/Lactic Acid

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