Fluorescent ratiometric indicators based on Cu(II)-induced changes in poly(NIPAM) microparticle volume.

Fluorescent ratiometric indicators based on Cu(II)-induced changes in poly(NIPAM) microparticle volume.
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DOI:
10.3390/s130101341
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发表时间:
2013-01-21
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Burdette S
Burdette S
中科院分区:
其他
文献类型:
--
作者:
Osambo J;Seitz WR;Kennedy DP;Planalp RP;Jones AM;Jackson RK;Burdette S

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由热响应聚合物 N-异丙基丙烯酰胺 (polyNIPAM)、金属离子结合配体和经历荧光共振能量转移 (FRET) 的荧光团对组成的微粒已被制备和表征。添加 Cu(II) 后,微粒会膨胀或收缩,具体取决于聚合物主链上是否引入或中和电荷。微粒形态的变化转化为 FRET 对中每个荧光团发射的变化。通过测量添加 Cu(II) 时 FRET 对之间的发射强度比,可以定量溶液中金属离子的浓度。这种比率荧光指示剂是利用发射光谱监测环境水样中 Cu(II) 热力学活性的持续努力中的最新技术。
Microparticles consisting of the thermal responsive polymer N-isopropyl acrylamide (polyNIPAM), a metal ion-binding ligand and a fluorophore pair that undergoes fluorescence resonance energy transfer (FRET) have been prepared and characterized. Upon the addition of Cu(II), the microparticles swell or contract depending on whether charge is introduced or neutralized on the polymer backbone. The variation in microparticle morphology is translated into changes in emission of each fluorophore in the FRET pair. By measuring the emission intensity ratio between the FRET pair upon Cu(II) addition, the concentration of metal ion in solution can be quantified. This ratiometric fluorescent indicator is the newest technique in an ongoing effort to use emission spectroscopy to monitor Cu(II) thermodynamic activity in environmental water samples.
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