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羧甲基-β-环糊精可减轻萘生物降解过程中镉、钴和铜的毒性。

Carboxymethyl-beta-cyclodextrin mitigates toxicity of cadmium, cobalt, and copper during naphthalene biodegradation.

机构信息

Kimberly - Clark Corporation, Corporate Research & Engineering, 2100 Winchester Road, Neenah, WI 54956, USA.

出版信息

Bioresour Technol. 2010 Apr;101(8):2672-7. doi: 10.1016/j.biortech.2009.10.073. Epub 2009 Dec 4.

Abstract

Hazardous waste sites are commonly contaminated with both organic and metal pollutants. Many metal pollutants have been shown to inhibit organic pollutant biodegradation. We investigated the ability of a modified, polydentate cyclodextrin (carboxymethyl-beta-cyclodextrin, CMCD) to reduce the toxicity of 33.4 microM cadmium, cobalt or copper during naphthalene degradation by a Burkholderia sp. in 120 h aerobic, batch studies. The highest investigated concentration of CMCD, 3340 microM, reduced cadmium, cobalt, and copper toxicity. With each metal, the length of the lag phase was reduced (by as much as 108 h with cobalt or copper), the cell yield was increased (by as much as a factor of 16 with cobalt), and the growth rate was increased (by as much as a factor of 31 with cobalt). The degrader was unable to use CMCD as the sole source of carbon and energy. Our data suggest that the ability of CMCD to complex metals plays an important role in its ability to mitigate metal toxicity and that CMCD has the potential to enhance biodegradation in organic and metal co-contaminated environments.

摘要

危险废物场地通常受到有机污染物和金属污染物的共同污染。许多金属污染物已被证明会抑制有机污染物的生物降解。我们研究了一种改良的、多齿环糊精(羧甲基-β-环糊精,CMCD)在有氧、批量研究中,在 120 小时内降低 33.4μM 镉、钴或铜对伯克霍尔德氏菌属(Burkholderia sp.)降解萘的毒性的能力。在研究的最高 CMCD 浓度 3340μM 时,降低了镉、钴和铜的毒性。对于每种金属,滞后期的长度都缩短了(钴或铜缩短了多达 108 小时),细胞产量增加了(钴增加了多达 16 倍),生长速率增加了(钴增加了多达 31 倍)。该降解菌无法将 CMCD 用作唯一的碳源和能源。我们的数据表明,CMCD 与金属形成配合物的能力在其减轻金属毒性的能力中起着重要作用,并且 CMCD 有可能增强有机和金属污染物共存环境中的生物降解。

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