Non-Ligninolytic TNT Mineralization in Contaminated Soil byPhanerochaete chrysosporium
作者:
Sisir K. Dutta,
Michelle M. Jackson,
Li Hua Hou,
David Powell,
Henry E. Tatem,
期刊:
Bioremediation Journal
(Taylor Available online 1998)
卷期:
Volume 2,
issue 2
页码: 97-103
ISSN:1088-9868
年代: 1998
DOI:10.1080/10889869891214240
出版商: TAYLOR & FRANCIS
关键词: TNT (2,4,6-trinitrotoluene);2Am-DNT (2-amino-4,6-dinitrotoluene);Phanerochaete chrysosporium;TNT-contami-nated soil;ligninolytic;non-ligninolytic.
数据来源: Taylor
摘要:
The explosive 2,4,6-trinitrotoluene (TNT) is widely used and results in widespread soil contamination. The white-rot fungusPhanerochaete chrysosporiumhas been shown to degrade TNT, using the peroxidase enzyme. In this study, we report peroxidase-independent degradation of TNT by non-ligninolyticP. chrysosporium. Significant disappearance of TNT from highly contaminated soil usingP. chrysosporiumhas been observed. Soil highly contaminated with TNT (2270 ppm [10 mM]) was diluted to 100 ppm (0.44 mM) with malt extract medium. Pregrown (48 hours) mycelial pellets ofP. chrysosporiumwere added in 100 mL malt extract medium and incubated in Gledhill flasks. Analysis by high-performance liquid chromatography (HPLC) was conducted on soil extracts at specific time points to estimate the disappearance of TNT from contaminated soil incubated withP. chrysosporium. When the pregrown mycelial pellets were added, TNT disappeared within 48 hours. The dissolved concentration of 2-amino-4,6-dinitrotoluene (2Am-DNT) increased up to the third day, then declined before its final disappearance by day 10. Results show that the pregrown mycelial pellets ofP. chrysosporiummineralized up to 17.3±6.3% [14C]-TNT within 30 days.
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