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PDMPO: a specific silicon or silica, pH sensitive fluorescent probe?

机译：PDMPO：特定的硅或二氧化硅，pH敏感荧光探针？

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摘要

In order to understand Si behavior and biodisponibility in soils and plants, we evaluated the use ofPDMPO(2-(4-pyridyl)-5-((4-(2-dimethylaminoethylaminocarbamoyl)methoxy)phenyl)oxazole) that was supposed to be a Si-specific fluorescence marker and to have a pH-dependent fluorescence. We studied the interactions betweenPDMPOand water-dissolved Si, Al and natural organic matter (humic acids, HA). Six systems with different HA, Si and Al concentrations were studied by fluorescence spectroscopy at pH 4, 7 and 9. The Al-PDMPOcomplex was characterized by infrared spectroscopy and the particle size distribution in solution was characterized by nano tracking analysis. We found that when usual pH buffers are not present, thePDMPOfluorescence was not pH dependent and was not Si-specific. In thePDMPO-Si-HA system, thePDMPOfluorescence signals were greatly enhanced, suggesting the formation of highly fluorescent ternary HA-PDMPO-Si groups. When Al was added to the system, the fluorescence was strongly quenched, suggesting the formation of low-fluorescence quaternary HA-PDMPO-Si-Al groups. ThePDMPOfluorescence is therefore greatly sensitive to complexable metals and to natural organic matter and is therefore difficult to be applied for the quantification of Si or pH in a complex medium.
机译：为了了解土壤和植物中的SI行为和生物特性，我们评估了PDMPO（2-（4-吡啶基）-5 - （（4-（2-二甲基氨基乙基氨基甲酰基）甲氧基）苯基）苯基）恶唑）的用途是一个Si特异性荧光标记物并具有pH依赖性荧光。我们研究了PDMPoand水溶性Si，Al和天然有机物（腐殖酸，HA）之间的相互作用。通过荧光光谱法在pH 4,7和9下研究具有不同HA，Si和Al浓度的六种系统。通过红外光谱表征Al-PDMPocomplex，并通过纳米跟踪分析表征溶液中的​​粒度分布。我们发现，当不存在通常的pH缓冲液时，吡喃氟荧光不是pH依赖性，并且不是特异性的。在ThePDMPO-SI-HA系统中，PDMpof荧光信号大大提高，表明高度荧光三元HA-PDMPO-Si组的形成。当Al被加入系统中时，强烈淬火荧光，表明低荧光季甲基PDMPO-Si-Al组的形成。因此，吡啶氟荧光对可扩散金属和天然有机物极大敏感，因此难以施加在复合介质中的Si或pH的定量。

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  • 来源
    《RSC Advances》 |2020年第51期|共9页
  • 作者

    Merdy Patricia; Neytard Cyril; Meunier Jean-Dominique; Lucas Yves;

  • 作者单位

    Univ Toulon &

    Var Aix Marseille Univ CNRS IM2NP F-83041 Toulon 9 France;

    Univ Toulon &

    Var Aix Marseille Univ CNRS IM2NP F-83041 Toulon 9 France;

    Aix Marseille Univ CNRS INRAE CEREGE IRD F-13545 Aix En Provence France;

    Univ Toulon &

    Var Aix Marseille Univ CNRS IM2NP F-83041 Toulon 9 France;

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  • 正文语种 eng
  • 中图分类 化学;
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