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首页> 外文期刊>Environmental Science & Technology >Redox Reactions of Phenazine Antibiotics with Ferric (Hydr)oxides and Molecular Oxygen
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Redox Reactions of Phenazine Antibiotics with Ferric (Hydr)oxides and Molecular Oxygen

机译：吩嗪类抗生素与三氧化二铁和分子氧的氧化还原反应

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摘要

Phenazines are small redox-active molecules produced by a variety of bacteria. Beyond merely serving as antibiotics, recent studies suggest that phenazines play important physiological roles, including one in iron acquisition. Here we characterize the ability of four electrochemically reduced natural phenazines-pyocyanin (PYO), phenazine-1-carboxylate (PCA), phenazine-1-carboxamide, and 1-hydroxyphenazine (1-OHPHZ)-to reductively dissolve ferrihydrite and hematite in the pH range 5-8. Generally, the reaction rate is higher for a phenazine with a lower reduction potential, with the reaction between PYO and ferrihydrite at pH 5 being an exception;the rate decreases as the pH increases; the rate is higher for poorly crystalline ferrihydrite than for highly crystalline hematite. Ferric (hydr)oxide reduction by reduced phenazines can potentially be inhibited by oxygen, where O_2 competes with Fe(lll) as the final oxidant. The reactivity of reduced phenazines with O_2 decreases in the order: PYO > 1-OHPHZ > PCA. Strikingly, reduced PYO, which is the least reactive phenazine with ferrihydrite and hematite at pH 7, is the most reactive phenazine with O_2. These results imply that different phenazines may perform different functions in environments with gradients of iron and O_2.
机译：吩嗪是由多种细菌产生的小的氧化还原活性分子。除了仅用作抗生素外，最近的研究表明吩嗪还起着重要的生理作用，包括铁的摄取。在这里，我们表征了四种电化学还原的天然吩嗪-花青素（PYO），吩嗪-1-羧酸盐（PCA），吩嗪-1-羧酰胺和1-羟基吩嗪（1-OHPHZ）的能力，可还原地溶解亚铁酸盐和赤铁矿。 pH范围5-8。通常，对于具有较低还原电位的吩嗪，反应速率较高，PYO与亚铁水合物在pH 5下的反应除外；该速率随pH的升高而降低；结晶性较差的三水铁矿的比率高于结晶性较高的赤铁矿的比率。还原的吩嗪还原三水合铁可能会受到氧气的抑制，其中O_2与作为最终氧化剂的Fe（III）竞争。还原的吩嗪与O_2的反应性依次降低：PYO> 1-OHPHZ> PCA。令人惊讶的是，还原的PYO是在pH值为7时与亚铁盐和赤铁矿反应最少的吩嗪，是与O_2一起反应性最高的吩嗪。这些结果表明，在铁和O_2的梯度环境中，不同的吩嗪可能发挥不同的作用。

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  • 来源
    《Environmental Science & Technology》 |2008年第7期|p.2380-2386|共7页
  • 作者

    YUN WANG; DIANNE K. NEWMAN;

  • 作者单位

    Department of Biology, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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