再生纤维素膜的微生物降解

采用田间掩埋、平皿培养和ＣＯ２释放试验分别测试了再生纤维素膜的生物降解性。试验结果表明：膜的失重随掩埋时间而增加；不同试验菌株对膜有不贩降解活性，其顺序为木霉Ｔ－３１１〉黑曲霉Ａ－３０５〉青霉Ｐ－３０７；掩埋或用菌株Ｔ－３１１接种４２ｄ后，膜的生物降解率可超过７０％；在膜的微生物降解过程中，失重、菌株在膜表面的可见生长和ＣＯ２释放分别是膜不同降解程度的表征，彼此既相关又有区别。

Microbial Degradation of Regenerated Cellulose Film

The biodegradability of regenerated cellulose film was tested by soil-burial test in field, culture-dish test and CO2 evolution test respectively. The results of test are as follows: (1) The mass loss of the film increased with the extension of soil-burial test ; (2) Test strains had different abilities to degrade the film, and the order of their abilities was strain T-311 >strain A-305 >strain P-307 ;the biodegradation rate of the film might exceed 70% during 42 days after the film had been buried or inoculated with strain T-311 ; (4) In the process of biodegradation, mass loss, visible growth of test strains on the film and CO2 evolution are both relative and different indexes for assessing biodegradation degrees of the film.