| Characteristic Chain-End Racemization Behavior during Photolysis of Poly(L-lactic acid). | |
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MedLine Citation:
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PMID: 21790202 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Photolysis of poly(L-lactic acid) (PLLA) has many unclear points, such as the degradation mechanism, kinetics, products, and racemization mechanism. To clarify these features of PLLA photolysis, the relationship between photolysis and racemization was examined. The hexad stereosequential analysis of photodegraded PLLA was investigated to specify the racemized positions within a chain in comparison with hydrolysis and thermal degradation. Results from 13C NMR spectra of UV-irradiated PLLA samples indicated that the samples have racemized D-lactate units at chain-ends. From the comparison of racemization behavior among photolysis, hydrolysis, and thermal degradation, it was confirmed that the preferential racemization behavior of each of these three degradation processes is characteristic and distinct, being identified as chain-end racemization, poor racemization, or internal-unit racemization, respectively. The characteristic chain-end racemization behavior of photolysis was first confirmed in this study. |
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Authors:
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Nobuhiko Yasuda; Takayuki Tsukegi; Yoshihito Shirai; Haruo Nishida |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-27 |
Journal Detail:
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Title: Biomacromolecules Volume: - ISSN: 1526-4602 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-7-27 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100892849 Medline TA: Biomacromolecules Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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