Valdivia-González M A, Díaz-Vásquez W A, Ruiz-León D, Becerra A A, Aguayo D R, Pérez-Donoso J M, Vásquez C C
Laboratorio de Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Avenida Libertador Bernardo O'Higgins #3363. Estación Central, Santiago, Chile.
Facultad de Ciencias de la Educación, Universidad Central de Chile, Santiago, Chile.
Arch Microbiol. 2018 Mar;200(2):267-273. doi: 10.1007/s00203-017-1438-2. Epub 2017 Oct 11.
The increasing industrial utilization of tellurium has resulted in an important environmental pollution with the soluble, extremely toxic oxyanion tellurite. In this context, the use of microorganisms for detoxifying tellurite or tellurium biorecovery has gained great interest. The ability of different Shewanella strains to reduce tellurite to elemental tellurium was assessed; the results showed that the reduction process is dependent on electron transport and the ∆pH gradient. While S. baltica OS155 showed the highest tellurite resistance, S. putrefaciens was the most efficient in reducing tellurite. Moreover, pH-dependent tellurite transformation was associated with tellurium precipitation as tellurium dioxide. In summary, this work highlights the high tellurite reduction/detoxification ability exhibited by a number of Shewanella species, which could represent the starting point to develop friendly methods for the recovery of elemental tellurium (or tellurium dioxide).
碲在工业上的使用日益增加，导致了可溶性剧毒含氧阴离子亚碲酸盐造成的重要环境污染。在此背景下，利用微生物对亚碲酸盐进行解毒或生物回收碲引起了人们极大的兴趣。评估了不同希瓦氏菌菌株将亚碲酸盐还原为元素碲的能力；结果表明，还原过程依赖于电子传递和ΔpH梯度。虽然波罗的海希瓦氏菌OS155表现出最高的亚碲酸盐抗性，但腐败希瓦氏菌在还原亚碲酸盐方面效率最高。此外，pH依赖的亚碲酸盐转化与二氧化碲形式的碲沉淀有关。总之，这项工作突出了许多希瓦氏菌物种所表现出的高亚碲酸盐还原/解毒能力，这可能是开发回收元素碲（或二氧化碲）友好方法的起点。
