Department of Chemistry, Faculty of Sciences, Shahid Chamran University, Ahvaz, Iran.
Analyst. 2012 Nov 21;137(22):5334-8. doi: 10.1039/c2an35504c.
In this paper, we have developed a simple colorimetric method for detection of resorcinol (RE); the method is based on the reaction of RE with silver ions (oxidizing agent) in the presence of starch as a stabilizer and formation of silver nanoparticles (AgNPs). At nanometer dimensions the electron cloud can oscillate on the particle surfaces when dispersed in liquid media so these nanoparticles exhibit a strong UV-Vis extinction band. A UV-Vis spectrophotometer is used to monitor the changes of the localized surface plasmon resonance (LSPR) of AgNPs at a wavelength of 430 nm. There is a linear relationship between absorbance intensity of AgNPs and the concentration of RE over the range of 4 × 10(-6) to 1.1 × 10(-5) mol L(-1) at 430 nm. The detection limit was 1.2 × 10(-6) mol L(-1). The proposed method has been successfully applied for the determination of RE in anti-acne solution and spiked shampoo samples.
本文开发了一种简单的比色法检测间苯二酚（RE）的方法；该方法基于在淀粉存在下，RE 与银离子（氧化剂）的反应，形成银纳米粒子（AgNPs）。在纳米尺寸下，当分散在液体介质中时，电子云可以在颗粒表面上振荡，因此这些纳米颗粒表现出很强的紫外-可见消光带。使用紫外-可见分光光度计监测在 430nm 处 AgNPs 的局域表面等离子体共振（LSPR）的变化。在 430nm 处，AgNPs 的吸光度与 RE 的浓度在 4×10(-6)到 1.1×10(-5)mol L(-1)范围内呈线性关系。检测限为 1.2×10(-6)mol L(-1)。该方法已成功应用于抗粉刺溶液和加标洗发水样品中 RE 的测定。
