中文摘要：

环糊精改性聚乳酸（PLA-β-CD）是一种全生物降解的新型生物材料。考察了环糊精改性聚乳酸基生物材料的体外降解行为，包括材料在蒸馏水中的pH值变化和在pH=7．4PBS中的失重率变化。结果表明，PLA-β-CD与PLA的降解行为相似，PLA-β-CD的分子主链没有被破坏，没有出现引入酸酐导致材料酸性进一步增强的现象。

英文摘要：

β-cyclodextrin modified polylactic acid（PLA-β-CD） is a kind of novel fully biodegradable materials. The biodegradation properties of PLA-β-CD were investigated, including the change of pH （distilled water as medium） and weight loss（PBS as medium, pH=7. 4）. The results reveal that the change of pH and weight loss tend to be in accordance with PLA, the main chain structure of PLA-β-CD is maintained and the acidity isn＇t enhanced by the introduction of anhydride.