The peroxidase-mimicking function of acetate and its application in single-enzyme-based glucose test paper

Accelerating the peroxidase-like activity of Co2+ by quinaldic acid: Mechanism and its analytical applications

Although enzyme mimics have been widely developed, limited catalytic efficiency is still a bottleneck, especially under neutral condition. Herein, we reported the bioactive quinaldic acid (QA) significantly boosted the peroxidase-like activity of Co²⁺ in the presence of bicarbonate (HCO₃^-). With 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulphonate) (ABTS) as the substrate, the catalytic activity of Co²⁺ (1 μM) was increased by over 300 times upon adding 100 μM QA. The formed Co²⁺ complex had much higher turnover number (5.52 min^-1) than that of cobalt-based nanozymes (0.011-0.51 min^-1) in decomposing H₂O₂. Based on this system, ultrasensitive colorimetric methods for the detection of Co²⁺, bicarbonate and urease activity were achieved with limits of detection of 4.6 nM, 40 μM and 0.00125 U/mL, respectively. For the first time, this work established an ultrasensitive method for the detection of urease activity by activating a peroxidase-like mimic with the produced HCO₃^-.

Lab-on-Paper Devices for Diagnosis of Human Diseases Using Urine Samples-A Review

In recent years, microfluidic lab-on-paper devices have emerged as a rapid and low-cost alternative to traditional laboratory tests. Additionally, they were widely considered as a promising solution for point-of-care testing (POCT) at home or regions that lack medical infrastructure and resources. This review describes important advances in microfluidic lab-on-paper diagnostics for human health monitoring and disease diagnosis over the past five years. The review commenced by explaining the choice of paper, fabrication methods, and detection techniques to realize microfluidic lab-on-paper devices. Then, the sample pretreatment procedure used to improve the detection performance of lab-on-paper devices was introduced. Furthermore, an in-depth review of lab-on-paper devices for disease measurement based on an analysis of urine samples was presented. The review concludes with the potential challenges that the future development of commercial microfluidic lab-on-paper platforms for human disease detection would face.

Facile one-pot synthesis of Mn3O4 nanorods and their analytical application

One-pot synthesis of Mn3O4 nanorods in aqueous solution at room temperature without using templates and surfactants was achieved for the first time, opening a new route for preparing various metal nanorods for detecting H2O2-related targets.