Degradation of poly( d-lactic acid) by a thermophile

A thermophile, which was isolated from soil as a microbe degrading poly(butylene succinate- co-butylene adipate) and identified as Bacillus stearothermophilus, was applied to degradation of poly( d-lactic acid) (PDLA) film. In the cultivation at 60 °C, the strain grew on PDLA and the dissolved total...

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Bibliographic Details
Published in:Polymer degradation and stability 2003, Vol.81 (1), p.167-171
Main Authors: Tomita, Kosuke, Tsuji, Hideto, Nakajima, Tomohiro, Kikuchi, Yumi, Ikarashi, Kensaku, Ikeda, Noritoshi
Format: Article
Language:English
Subjects:
Applied sciences
Bacillus stearothermophilus
Biodegradation
Chemical reactions and properties
Degradation
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Poly( d-lactic acid)
Thermophile
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Summary:A thermophile, which was isolated from soil as a microbe degrading poly(butylene succinate- co-butylene adipate) and identified as Bacillus stearothermophilus, was applied to degradation of poly( d-lactic acid) (PDLA) film. In the cultivation at 60 °C, the strain grew on PDLA and the dissolved total organic carbon (TOC) concentration in the medium changed according to the growth stage, i.e., after the TOC rapidly reached the minimum, it increased gradually. As for residual PDLA, gel permeation chromatograms showed a marked shift of the whole peak to low molecular weight region, and moreover, degree of crystallinity increased, while melting temperature decreased. PDLA was proved to be highly degraded by this strain.
ISSN:0141-3910
1873-2321
DOI:10.1016/S0141-3910(03)00086-7