Aqueous polyfluorene probe for the detection and estimation of Fe<sup>3+</sup>and inorganic phosphate in blood serum
作者:Atul Kumar Dwivedi、Gunin Saikia、Parameswar Krishnan Iyer
DOI:10.1039/c0jm03054f
日期:——
A novel anionic polyfluorene derivative, poly(9,9-bis(6′-sulfate)hexyl) fluorene-alt-1,4-phenylene sodium salt (P1) is synthesized. P1 exhibits exemplary activity towards the selective detection of Fe3+ and phosphates (Pi) under physiological conditions. On binding to Fe3+, exceptional fluorescence quenching of P1 occurred, demonstrated by a >97% reduction in the fluorescence intensity. Furthermore, the P1–Fe3+ assay is highly selective for inorganic phosphate (Pi) anions at biological pH values, observed by complete fluorescence dequenching and confirmed through a >95% fluorescence enhancement. In order to validate its diagnostic potential, this assay was employed to monitor the Pi levels in a competing biological environment like blood serum. At pH 7.4 this assay showed a high specific activity to detect Pi in the bioassay environment, observed by the unique enhancements in fluorescence intensities for varying and low Pi concentrations. Since this assay performed Pi detection at very low concentrations we utilized it successfully for the fluorometric estimation of Pi in blood serum with high accuracy and within short duration. This remarkable ability of P1 to accomplish in situ monitoring and estimation of indispensable biological targets like Fe3+ and Pi rapidly and in label-free conditions, corroborates the extension of this assay system for clinical application.
一种新型阴离子聚芴衍生物--聚(9,9-双(6′-硫酸盐)己基)芴-alt-1,4-苯钠盐(P1)被合成出来。P1 在生理条件下对 Fe3+ 和磷酸盐 (Pi) 的选择性检测具有出色的活性。在与 Fe3+ 结合时,P1 会发生异常的荧光淬灭,表现为荧光强度降低了 >97%。此外,在生物 pH 值下,P1-Fe3+ 分析法对无机磷酸盐(Pi)阴离子具有高度选择性,可通过完全的荧光去淬灭观察到,并通过 >95% 的荧光增强得到证实。为了验证其诊断潜力,该检测方法被用于监测血清等竞争性生物环境中的 Pi 水平。在 pH 值为 7.4 的条件下,该检测方法对生物检测环境中的π具有很高的特异性,在不同的π浓度和低π浓度下,荧光强度都有独特的增强。由于这种检测方法能在很低的浓度下检测 Pi,我们成功地利用它对血清中的 Pi 进行了荧光测定,准确度高,时间短。P1 能够在无标记的条件下快速完成对 Fe3+ 和 Pi 等不可或缺的生物目标的原位监测和估算,这种非凡的能力证实了该检测系统在临床应用中的扩展性。