Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, PR China.
Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, PR China.
Talanta. 2015 Jan;131:678-83. doi: 10.1016/j.talanta.2014.08.025. Epub 2014 Aug 19.
A new sensing system is developed for selective and ultrasensitive detection of iodide based on the inner filter effect (IFE) between conjugated polyelectrolyte-stabilized silver nanoparticles (P1-AgNPs) and 4-oxo-4-(pyren-1-ylmethoxy) butanoic acid (probe 1). P1-AgNPs are designed to be capable of functioning as a composite light-absorber. Meanwhile, probe 1 is selected as an ideal fluorophore because its emission spectrum can perfectly overlap with the absorption band of P1-AgNPs. The intense fluorescence of probe 1 quenched by P1-AgNPs can be efficiently recovered after adding H2O2 and I(-) via the oxidation-etching and regeneration of P1-AgNPs. Under the optimum conditions, this facile IFE-based approach allows the sensitive and selective determination of I(-) in tap water, iodized salt and urine with the detection limit as low as 0.3 nM (S/N=3). Interestingly, the regenerated AgNPs is in smaller size and well-dispersed perhaps due to the particular role of P1 as a polymer localizer containing pyridinyl and sulfonate groups.
一种新的传感系统是基于聚电解质稳定的银纳米粒子（P1-AgNPs）和 4-氧代-4-（芘-1-基甲氧基）丁酸（探针 1）之间的内滤效应（IFE）开发的，用于选择性和超灵敏检测碘化物。P1-AgNPs 被设计为能够作为复合光吸收剂。同时，探针 1 被选为理想的荧光团，因为其发射光谱可以与 P1-AgNPs 的吸收带完美重叠。在加入 H2O2 和 I(-)后，通过 P1-AgNPs 的氧化蚀刻和再生，可以有效地恢复被 P1-AgNPs 猝灭的探针 1 的强荧光。在最佳条件下，这种基于简单内滤效应的方法可以在自来水中、碘盐和尿液中对 I(-)进行灵敏和选择性的测定，检测限低至 0.3 nM（S/N=3）。有趣的是，由于 P1 作为含有吡啶基和磺酸盐基团的聚合物定位剂的特殊作用，再生的 AgNPs 尺寸更小，分散性更好。
