Water-Soluble Iridium(III)-Containing Conjugated Polyelectrolytes with Weakened Energy Transfer Properties for Multicolor Protein Sensing Applications

Water-Soluble Iridium(III)-Containing Conjugated Polyelectrolytes with Weakened Energy Transfer Properties for Multicolor Protein Sensing Applications
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用于多色蛋白质传感应用的具有弱能量传递特性的水溶性含铱 (III) 共轭聚电解质

DOI:
10.1021/ma201614z
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发表时间:
2011-10
期刊:
影响因子:
5.5
通讯作者:
Fan Quli
Fan Quli
中科院分区:
化学1区
文献类型:
--
作者:
Huang Wei;Sun Pengfei;Lu Xiaomei;Fan Quli

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通过Suzuki偶联反应合成了以铱配合物((ppy)2Ir(FlPy))为能量受体的阳离子共轭聚电解质(CPE)。具有12mol%(ppy)2Ir(FlPy)(P4)的聚合物在水溶液中由于溶解度限制引起的聚合物聚集而显示出有效的固有荧光共振能量转移(FRET)。因此,在相对高的浓度下,P4在供体激发时发射双发射红色磷光。P4对蛋白质的发射响应的研究揭示了在组蛋白而不是其他蛋白质存在下从主要片段(供体)到(ppy)2Ir(FlPy)单元(受体)的独特减弱的FRET过程。通过这种选择性减弱的FRET过程,P4溶液的发射颜色仅在组蛋白存在下从红色变为淡紫色,从而允许视觉区分组蛋白。此外,P4的这种减弱的FRET的线性也使得能够有效地定量组蛋白,检测限为0.06 μM。这...
Cationic conjugated polyelectrolytes (CPEs) containing an iridium complex ((ppy)2Ir(FlPy)) as the energy acceptor were synthesized via Suzuki coupling reaction. The polymer with 12 mol % (ppy)2Ir(FlPy) (P4) shows efficient intrinsic fluorescence resonance energy transfer (FRET) in aqueous solution due to the solubility-limitation-caused polymer aggregation. Thus, at a relatively high concentration, P4 emits dual-emissive red phosphorescence upon donor excitation. Investigation of the emission responses of P4 toward proteins reveals a unique weakened FRET process from the main segments (donor) to the (ppy)2Ir(FlPy) units (acceptor) in the presence of histone instead of other proteins. With such a selective weakened FRET process, the emission color of P4 solution turns from red into lilac only in the presence of histone, allowing for visual discrimination of histone. Moreover, the linearity of this weakened FRET of P4 also enables effective quantification of histone with a limit of detection of 0.06 μM. Thi...
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