淀粉基铽(Ⅲ)配合物的制备及荧光检测性能

Preparation and fluorescence detection performance of starch-based terbium(Ⅲ) complex

摘要:

本文制备了一个基于氧化淀粉纳米颗粒(OSNP)的稀土铽(Ⅲ)配合物OSNP@Tb3+，在320 nm的激发波长下，该物质能发射强烈的绿色荧光。将OSNP@Tb3+作为生物荧光探针检测不同抗生素时，发现该物质对呋喃唑酮的检测有较高的灵敏性和选择性。OSNP@Tb3+水分散液的荧光强度随呋喃唑酮浓度的增加逐渐减少，当呋喃唑酮浓度为2.3 × 10-4 mol/L时，荧光基本完全猝灭（猝灭效率 > 90%）。OSNP@Tb3+水分散液对呋喃唑酮的检测呈现较高的猝灭常数〔Ksv = 1.919 × 104 C-1、良好的线性关系 (R2 = 0.992)和低的检测限（1.67 × 10-6 mol/L)〕。

Abstract:

The paper shows a new terbium (Ⅲ) complex OSNP@Tb3+ based on oxidized starch nanoparticles (OSNP), which can emit strong green fluorescence at 320 nm excitation wavelength. The furazolidone will especially behave the highest sensitivity and selectivity during detecting different antibiotics by using OSNP@Tb3+ as fluorescence probe. The luminescence intensity of OSNP@Tb3+ aqueous dispersion gradually decreases with the increase of furazolidone concentration. The luminescence can almost be quenched completely (quenching efficiency > 90%) at the concentration of 2.3 × 10-4 mol/L. OSNP@Tb3+ aqueous dispersion presents high quenching constant (Ksv = 1.919 × 104 (mol/L)-1, good linear relationship (R2 = 0.992) and low detection limit (1.67 × 10-6 mol/L) when it was used for detecting furazolidone.