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3D 打印电极集成传感芯片和即时检测设备,用于无酶电化学检测血液中的尿素。

3-D printed electrode integrated sensing chip and a PoC device for enzyme free electrochemical detection of blood urea.

机构信息

Material Processing and Microsystems Laboratory, CSIR-Central Mechanical Engineering Research Institute, M.G. Avenue, Durgapur, WB 713209, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-Human Resource Development Centre, (CSIR-HRDC) Campus Postal Staff College Area, Sector 19, Kamla Nehru Nagar, Ghaziabad, UP 201002, India.

Material Processing and Microsystems Laboratory, CSIR-Central Mechanical Engineering Research Institute, M.G. Avenue, Durgapur, WB 713209, India.

出版信息

Bioelectrochemistry. 2021 Dec;142:107893. doi: 10.1016/j.bioelechem.2021.107893. Epub 2021 Jul 21.

Abstract

Herein we report a novel electrochemical sensing chip and a point-of-care device (PoC) for enzyme-free electrochemical detection of urea in human blood. The electrochemical sensing chip was developed by 3-D printing of conductive Ag ink and subsequent electrodeposition of AuNP-rGO nanocomposite. Material characterization of the sensing chip was conducted to find a plausible mechanism for the electrochemical reaction with urea. Subsequently, the response with varying concentrations of urea in solution and human blood samples was tested. High peak response current (~5 times than that of the highest reported value), low impedance, rapid sensor fabrication procedure, high selectivity towards urea, excellent linear response (R = 0.99), high sensitivity of 183 μA mM cm, the fast response indicated by high diffusion coefficient, the limit of detection of 0.1 µM, tested shelf life of more than 6 months and recovery rate of >99% ensured the application of the developed sensor chip towards PoC urea detection test kit. A PoC device housing an electronic circuitry following the principles of linear sweep voltammetry and compatible with a sensing chip was developed. A maximum percentage error of 4.86% and maximum RSD of 3.63% confirmed the use of the PoC device for rapid urea measurements in human blood.

摘要

在此,我们报告了一种新颖的电化学传感芯片和一种即时检测设备(PoC),用于在人血中无酶电化学检测尿素。电化学传感芯片是通过导电 Ag 油墨的 3D 打印和随后的 AuNP-rGO 纳米复合材料的电沉积来开发的。对传感芯片进行了材料表征,以找到与尿素发生电化学反应的合理机制。随后,测试了在溶液和人血样中不同浓度的尿素的响应。高峰值响应电流(~比报道的最高值高 5 倍)、低阻抗、快速传感器制造程序、对尿素的高选择性、出色的线性响应(R=0.99)、高灵敏度为 183 μA mM cm、高扩散系数表示的快速响应、检测限为 0.1 μM、超过 6 个月的保质期和>99%的回收率确保了所开发的传感器芯片在即时检测尿素检测试剂盒中的应用。根据线性扫描伏安法的原理开发了一种即时检测设备外壳,并与传感芯片兼容。最大百分比误差为 4.86%,最大 RSD 为 3.63%,证实了即时检测设备可用于快速测量人血中的尿素。

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