γ-聚谷氨酸乙酯与γ-聚谷氨酸苄酯的生物降解性能

Bio-degradation characteristics of poly(γ-glutamic acid) ethyl ester and poly(γ-glutamic acid) benzyl ester

为了了解生物可降解聚合物γ-聚谷氨酸(γ-PGA)乙酯与γ-聚谷氨酸苄酯的生物降解性能,采用枯草杆菌NX-2(Bacillus subtilis)、黑曲霉(Aspergillus niger)和土埋法对γ-PGA乙酯和γ-PGA苄酯的降解性能进行研究,用扫描电镜观察降解结果.结果表明:枯草杆菌对γ-PGA乙酯和γ-PGA苄酯的降解作用优于黑曲霉;相对厚度较大的薄膜,在枯草杆菌NX-2中缓慢降解;在黑曲霉中,γ-PGA乙酯的降解速率相对较慢,薄膜的形态没有发生变化;γ-PGA苄酯的降解性能优于γ-PGA乙酯.

In order to understand the bio-degradation characteritics of poly （γ-glutamic acid） ethyl ester and poly（γ-glutamic acid） benzyl esters. The B. subtilis NX-2 ,A. niger and soil burial test were used. Scanning electron microscopy（SEM） was also used to observe the biodegradability. Results showed that the degradation characteristics of poly （ γ-glutamic acid） ethyl ester and poly （ γ-glntamic acid） benzyl ester with B. subtilis NX-2 was better than that with A. niger. When the ester was a thick film, its degradation rate with B. subtilis NX-2 was a slow one, but with A. niger, the degradation rate of poly （γ-glutamic acid） ethyl ester was lower because of hardly any changes of the shape. The degradation characteristics of poly（γ-glutamic acid） benzyl ester were better than that of poly （γ-glutamic acid） ethyl ester.