高阶连多硫酸盐在嗜酸氧化硫硫杆菌和硫杆菌培养物还原六价铬中的作用。
The role of higher polythionates in the reduction of chromium(VI) by Acidithiobacillus and Thiobacillus cultures.
作者信息
Allegretti P, Furlong J, Donati E
机构信息
Laboratorio de Estudio de Compuestos Orgánicos (LADECOR), División Química Orgánica, Departamento de Química, Facultad de Ciencias Exactas, Universidad National de La Plata, Argentina.
出版信息
J Biotechnol. 2006 Mar 9;122(1):55-61. doi: 10.1016/j.jbiotec.2005.08.031. Epub 2005 Oct 11.
In this paper, we report the chromium(VI) reduction by filtrates of Acidithiobacillus and Thiobacillus cultures. Chromium(VI) reduction by filtrates of A. ferrooxidans cultures under acidic conditions was higher than that observed for A. thiooxidans. However, at pH close to 7, chromium(VI) reduction by filtrates of T. thioparus cultures was as high as that by filtrates of A. thiooxidans cultures and much higher than that observed for A. ferrooxidans cultures at the same pH. The capability of these cultures to reduce chromium(VI) was associated specifically with the fraction of cultures (cells, sulphur and associated sulphur compounds) retained by filtration through a 0.45mum filter. In the fraction that comes from A. thiooxidans culture, polythionates (S(x)O(6)(2-)) with 3-7 sulphur atoms were detected and identified (by HPLC with MS as detector). The model of vesicles containing polythionates, sulphur and water agrees with our results.
在本文中，我们报道了嗜酸氧化亚铁硫杆菌（Acidithiobacillus）和硫杆菌（Thiobacillus）培养滤液对六价铬的还原作用。在酸性条件下，嗜酸氧化亚铁硫杆菌培养滤液对六价铬的还原作用高于氧化硫硫杆菌（A. thiooxidans）。然而，在pH接近7时，排硫硫杆菌（T. thioparus）培养滤液对六价铬的还原作用与氧化硫硫杆菌培养滤液的还原作用相当，且远高于相同pH下嗜酸氧化亚铁硫杆菌培养滤液的还原作用。这些培养物还原六价铬的能力与通过0.45μm滤膜过滤后保留的培养物部分（细胞、硫及相关硫化合物）密切相关。在来自氧化硫硫杆菌培养物的部分中，检测并鉴定出了含3 - 7个硫原子的连多硫酸盐（S(x)O(6)(2-)）（通过以质谱为检测器的高效液相色谱法）。含有连多硫酸盐、硫和水的囊泡模型与我们的结果相符。
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