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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Biodegradation of a Biocide (Cu-N-Cyclohexyldiazenium Dioxide) Component of a Wood Preservative by a Defined Soil Bacterial Community
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Biodegradation of a Biocide (Cu-N-Cyclohexyldiazenium Dioxide) Component of a Wood Preservative by a Defined Soil Bacterial Community

机译：明确的土壤细菌群落对木材防腐剂的杀生物剂（Cu-N-环己基二氮杂二氧化物）组分的生物降解

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The wood protection industry has refined their products from chrome-, copper-, and arsenate-based wood preservatives toward solely copper-based preservatives in combination with organic biocides. One of these is Cu-HDO, containing the chelation product of copper and N-cyclohexyldiazenium dioxide (HDO). In this study, the fate of isotope-labeled (13C) and nonlabeled (12C) Cu-HDO incorporated in wood sawdust mixed with soil was investigated. HDO concentration was monitored by high-pressure liquid chromatography. The total carbon and the δ13C content of respired CO2, as well as of the soil-wood-sawdust mixture, were determined with an elemental analyzer-isotopic ratio mass spectrometer. The concentration of HDO decreased significantly after 105 days of incubation, and after 24 days the 13CO2 concentration respired from soil increased steadily to a maximum after 64 days of incubation. Phospholipid fatty acid-stable isotope probing (PFA-SIP) analysis revealed that the dominant PFAs C19:0d8,9, C18:0, C18:1ω7, C18:2ω6,9, C17:1d7,8, C16:0, and C16:1ω7 were highly enriched in their δ13C content. Moreover, RNA-SIP identified members of the phylum Acidobacteria and the genera Phenylobacterium and Comamonas that were assimilating carbon from HDO exclusively. Cu-HDO as part of a wood preservative effectively decreased fungal wood decay and overall microbial respiration from soil. In turn, a defined bacterial community was stimulated that was able to metabolize HDO completely.
机译：木材保护行业已将其产品从基于铬，铜和砷酸盐的木材防腐剂改进为仅与有机杀菌剂结合的铜基防腐剂。其中之一是Cu-HDO，包含铜和N-环己基二氧化氮（HDO）的螯合产物。在这项研究中，研究了掺有木屑和土壤的木屑中掺有同位素标记的（ 13 C）和未标记的（ 12 C）Cu-HDO的去向。通过高压液相色谱监测HDO浓度。用元素分析仪-同位素比质谱仪测定呼吸的二氧化碳以及土壤-木材-木屑混合物中的总碳和δ 13 C含量。孵育105天后，HDO浓度显着下降，孵育24天后，从土壤呼吸的 13 CO2浓度稳定增加至最大值。磷脂脂肪酸稳定同位素探测（PFA-SIP）分析显示，主要的PFA C19：0d8,9，C18：0，C18：1ω7，C18：2ω6,9，C17：1d7,8，C16：0和C16 ：1ω7的δ 13 C含量很高。此外，RNA-SIP鉴定了酸性细菌门以及苯细菌和Comamonas属的成员，这些成员专门从HDO吸收碳。 Cu-HDO作为木材防腐剂的一部分可有效减少真菌木材腐烂和土壤中的整体微生物呼吸。反过来，刺激了能够完全代谢HDO的特定细菌群落。

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