胞外聚合物对土壤中苯并芘的降解

Degradation of Benzo[a]pyrene in Soils by Extracellular Polymeric Substances

研究从Pseudomonas sp.DNBe-S1中分离出的胞外聚合物(EPS)对苯并芘(Ba P)在污染土壤中的降解。结果表明,EPS的主要成分是蛋白质,含量为68%;EPS可以促进土壤中Ba P的降解,并且Ba P的降解率随着EPS的添加体积增加而提高。35 d后,Ba P在土壤中的降解率从20%(未添加EPS)提高到79%(添加15 m L EPS悬浮液)。该结果可为EPS在多环芳烃(PAHs)污染土壤的生物修复中的作用提供新的见解。

The extracellular polymeric substances（EPS） isolated from Pseudomonas sp. DNBe-S1 was applied in studies of degradation of benzo[a]pyrene（Ba P）in contaminated soils. The results showed that the main composition of EPS was protein with content of 68%, and EPS enhanced Ba P degradation in soils. Moreover, the degradation rate of Ba P increased as the initial addition volume of EPS increased. After 35 days, the degradation rate of Ba P in soils increased from 20%（no EPS addition）to 79%（addition of 15 m L EPS suspension）. The above results can provide new insight into the function of EPS in bioremediation of polycyclic aromatic hydrocarbons（PAHs）contaminated soils.