化学合成聚3-羟基丁酸酯薄膜的生物降解性

The Biodegradation of Chemically SynthesizedPoly (3hydroxybutyrate)Films

利用土壤埋藏、海水降解、活性污泥及高等真菌降解实验对化学法合成的聚３－羟基丁酸酯（ＰＨＢ）薄膜进行了生物降解性研究．结果表明，降解ＰＨＢ薄膜的微生物分布比较广泛；水解作用和酸解作用在ＰＨＢ生物降解过程中对其失重率影响很小（３．５％以下）；液态摇动培养不利于木素降解菌云芝５．４８对ＰＨＢ薄膜的降解（培养至第２０ｄ，ＰＨＢ１２和ＰＨＢ２７仅降解１７．８％和１３．５％）；ＰＨＢ薄膜的结晶度比分子量对其生物降解性影响更大。

The biodegradation of chemically synthesized poly(3hydroxybutyrate) (PHB) films was studied by the basidiomycetes,activated sludge,soil,and seawater experiments.It was found that PHBdegrading microorganisms are widely distributed in natural environments;hydrolytic and acidic degradation shows little influence on biodegradation rate of PHB film (below 35%);the shake culture is unfavourable to the biodegradation of PHB12 and PHB27 for Coriolus versicolor 548(degraded 178% and 135% at the 20th day respectively);the biodegradability of PHB film decreases with an increase in its crystallinity,which has a stronger influence over its biodegradation than the molecular weight.