Guo Jian-Feng, Huo Dan-Qun, Yang Mei, Hou Chang-Jun, Li Jun-Jie, Fa Huan-Bao, Luo Hui-Bo, Yang Ping
Key Laboratory of Biorheology Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, China.
Key Laboratory of Biorheology Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, China.
Talanta. 2016 Dec 1;161:819-825. doi: 10.1016/j.talanta.2016.09.032. Epub 2016 Sep 12.
Herein, we have developed a simple, sensitive and paper-based colorimetric sensor for the selective detection of Chromium (Ⅵ) ions (Cr (VI)). Silanization-titanium dioxide modified filter paper (STCP) was used to trap bovine serum albumin capped gold nanoparticles (BSA-Au NPs), leading to the fabrication of BSA-Au NPs decorated membrane (BSA-Au NPs/STCP). The BSA-Au NPs/STCP operated on the principle that BSA-Au NPs anchored on the STCP were gradually etched by Cr (VI) as the leaching process of gold in the presence of hydrobromic acid (HBr) and hence induced a visible color change. Under optimum conditions, the paper-based colorimetric sensor showed clear color change after reaction with Cr (VI) as well as with favorable selectivity to a variety of possible interfering counterparts. The amount-dependent colorimetric response was linearly correlated with the Cr (VI) concentrations ranging from 0.5µM to 50.0µM with a detection limit down to 280nM. Moreover, the developed cost-effective colorimetric sensor has been successfully applied to real environmental samples which demonstrated the potential for field applications.
在此，我们开发了一种简单、灵敏且基于纸张的比色传感器，用于选择性检测六价铬离子（Cr(VI)）。硅烷化二氧化钛修饰的滤纸（STCP）用于捕获牛血清白蛋白包覆的金纳米粒子（BSA-Au NPs），从而制备了BSA-Au NPs修饰的膜（BSA-Au NPs/STCP）。BSA-Au NPs/STCP的工作原理是，在氢溴酸（HBr）存在下，锚定在STCP上的BSA-Au NPs会被Cr(VI)逐渐蚀刻，这是金的浸出过程，因此会引起可见的颜色变化。在最佳条件下，基于纸张的比色传感器与Cr(VI)反应后显示出明显的颜色变化，并且对各种可能的干扰物具有良好的选择性。比色响应的量依赖关系与Cr(VI)浓度在0.5μM至50.0μM范围内呈线性相关，检测限低至280nM。此外，所开发的具有成本效益的比色传感器已成功应用于实际环境样品，证明了其在现场应用中的潜力。
