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分子印迹聚合物双电化学传感器一步法测定尿白蛋白与肌酐比值(ACR)。

Molecularly imprinted polymer dual electrochemical sensor for the one-step determination of albuminuria to creatinine ratio (ACR).

机构信息

Center of Excellence for Trace Analysis and Biosensor, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand; Division of Physical Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand; Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand.

Center of Excellence for Trace Analysis and Biosensor, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand; Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand; Division of Health and Applied Sciences, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand.

出版信息

Talanta. 2023 Dec 1;265:124769. doi: 10.1016/j.talanta.2023.124769. Epub 2023 Jun 7.

Abstract

The urinary albumin to creatinine ratio (ACR) is a convenient and accurate biomarker of chronic kidney disease (CKD). An electrochemical sensor for the quantification of ACR was developed based on a dual screen-printed carbon electrode (SPdCE). The SPdCE was modified with carboxylated multiwalled carbon nanotubes (f-MWCNTs) and redox probes of polymethylene blue (PMB) for creatinine and ferrocene (Fc) for albumin. The modified working electrodes were then molecularly imprinted with coated with polymerized poly-o-phenylenediamine (PoPD) to form surfaces that could be separately imprinted with creatinine and albumin template molecules. The seeded polymer layers were polymerized with a second coating of PoPD and the templates were removed to form two different molecularly imprinted polymer (MIP) layers. The dual sensor presented recognition sites for creatinine and albumin on different working electrodes, enabling the measurement of each analyte in one potential scan of square wave voltammetry (SWV). The proposed sensor produced linear ranges of 5.0-100 ng mL and 100-2500 ng mL for creatinine, and 5.0-100 ng mL for albumin. LODs were 1.5 ± 0.2 ng mL and 1.5 ± 0.3 ng mL, respectively. The dual MIP sensor was highly selective and stable for seven weeks at room temperature. The ACRs obtained using the proposed sensor compared well (P > 0.05) with the results from immunoturbidimetric and enzymatic methods.

摘要

尿白蛋白与肌酐比值 (ACR) 是慢性肾脏病 (CKD) 的一种方便且准确的生物标志物。基于双丝网印刷碳电极 (SPdCE) 开发了一种用于定量 ACR 的电化学传感器。SPdCE 用羧基化多壁碳纳米管 (f-MWCNTs) 和聚亚甲基蓝 (PMB) 的氧化还原探针修饰,用于肌酐和二茂铁 (Fc) 用于白蛋白。然后,用聚合聚邻苯二胺 (PoPD) 修饰修饰后的工作电极进行分子印迹,形成可分别用肌酐和白蛋白模板分子印迹的表面。将种子聚合物层用第二涂层 PoPD 聚合,然后去除模板以形成两个不同的分子印迹聚合物 (MIP) 层。双传感器在不同的工作电极上呈现出针对肌酐和白蛋白的识别位点,从而能够在方波伏安法 (SWV) 的一次电位扫描中测量每种分析物。所提出的传感器对肌酐的线性范围为 5.0-100ng mL 和 100-2500ng mL,对白蛋白的线性范围为 5.0-100ng mL。LOD 分别为 1.5±0.2ng mL 和 1.5±0.3ng mL。双 MIP 传感器在室温下具有高度选择性和稳定性,可稳定工作 7 周。与免疫比浊法和酶法相比,所提出的传感器获得的 ACR 结果相当(P>0.05)。

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