Accelerated biodegradation of poly(vinyl alcohol) by glycosidations of the hydroxyl groups or addition of sugars
In: Biomacromolecules, Jg. 5 (2004), Heft 3, S. 1029-1037
academicJournal
- print,
Zugriff:
Biodegradabilities of N-acetyl-D-glucosamine (GlcNAc)- (1) and chitobiose-substituted (2) poly(vinyl alcohol)s (PVA)s in a soil suspension (pH 6.5) were investigated at 25 °C for 40 days. Biochemical oxygen demand of 1 with a degree of substitution of 0.2-0.3 (DP = 430-480) was higher than that of PVA under the degradation condition. Size exclusion chromatography, 1H NMR, and Fourier-transform infrared measurements of the recovered sample indicated that biodegradation of the PVA main chain was accelerated by partial glycosidation of hydroxyl groups in PVA. Similar acceleration was observed in a PVA/GlcNAc (50:50, w/w) mixture. Microbes which relate with degradation of the glycosidated polymers were grown in a culture medium including the soil suspension and the polymer as the carbon source. Polyacrylamide gel electrophoresis (SDS-PAGE) and IR measurements indicated that a cell-free extract derived from GlcNAc-substituted PVA was different from that in the PVA/GlcNAc mixture. The results suggested that the PVA main chain in GlcNAc-substituted PVA was cleaved by a different microorganism or via a mechanism different from that in the mixture. Chitobiose-substituted PVA 2 showed more enhanced acceleration, indicating that the sugar length influenced the degradability.
Titel: |
Accelerated biodegradation of poly(vinyl alcohol) by glycosidations of the hydroxyl groups or addition of sugars
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Autor/in / Beteiligte Person: | TAKASU, Akinori ; TAKADA, Mizuho ; ITOU, Hisashi ; HIRABAYASHI, Tadamichi ; KINOSHITA, Takatoshi |
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Zeitschrift: | Biomacromolecules, Jg. 5 (2004), Heft 3, S. 1029-1037 |
Veröffentlichung: | Washington, DC: American Chemical Society, 2004 |
Medientyp: | academicJournal |
Umfang: | print, |
ISSN: | 1525-7797 (print) |
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