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首页> 外文会议>International Biohydrometallurgy Symposium, IBS-2001 Sep 16-19, 2001, Ouro Preto, Minas Gerais, Brazil >Bioleaching - a result of interfacial processes caused by extracellular polymeric substances (EPS)
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Bioleaching - a result of interfacial processes caused by extracellular polymeric substances (EPS)

机译：生物浸出-由细胞外聚合物（EPS）引起的界面过程的结果

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Extracellular polymeric substances seem to play a pivotal role in bioleaching - the winning of precious metals as well as acid rock drainage. For a better control of both processes structure and function of extracellular polymeric substances from leaching bacteria are of crucial importance. Our research focussed on Acidithiobacillus ferrooxidans, the composition of its extracellular polymeric substances and further deduction of their function. The extracellular polymeric substances of Acidithiobacillus ferrooxidans consist mainly of neutral sugars and lipids. The functions of the extracellular polymeric substances of this leaching bacterium seem to be (I) to mediate attachment to a (metal) sulfide surface, (II) to concentrate iron(III)ions by complexation through uronic acids or other residues at the mineral surface and, thus, allowing for an oxidative attack on the sulfide. Consequence is the enhancement of metal sulfide, dissolution which may result in an acceleration of 20- to 100-fold over chemical leaching. Experiments were performed to elucidate the importance of the iron(III)ions complexed by extracellular polymeric substances for strain specific differences in oxidative activity for pyrite dissolution. The preliminary data indicate that strains of Acidithiobacillus ferrooxidans with a high amount of iron(III)ions in their extracellular polymeric substances, possess a higher oxidation activity than those with less iron(III)ions. These data provide new insight into the function and, consequently, the advantage extracellular polymeric substances confer to bacteria involved in bioleaching.
机译：细胞外聚合物似乎在生物浸出中起着举足轻重的作用-贵金属的赢取以及酸性岩石的排泄。为了更好地控制过程，来自浸出细菌的细胞外聚合物的结构和功能至关重要。我们的研究集中在酸性氧化铁硫杆菌，其胞外聚合物的组成及其功能的进一步推论上。酸性氧化硫硫杆菌的胞外聚合物主要由中性糖和脂质组成。该浸出细菌的细胞外聚合物质的功能似乎是（I）介导与（金属）硫化物表面的附着，（II）通过糖醛酸或矿物质表面的其他残基络合来浓缩铁（III）离子因此，允许对硫化物的氧化侵蚀。结果是金属硫化物的增加，溶解可能导致化学浸提加速20到100倍。进行实验以阐明与胞外聚合物复合的铁（III）离子对于黄铁矿溶解氧化活性的菌株特异性差异的重要性。初步数据表明，其胞外聚合物中具有大量铁（III）离子的酸性氧化铁硫杆菌属菌株比具有较少铁（III）离子的菌株具有更高的氧化活性。这些数据提供了对该功能的新见解，因此，提供了细胞外聚合物赋予与生物浸出有关的细菌的优势。

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