Smartphone-assisted colorimetric sensing platform based on molybdenum-doped carbon dots nanozyme for visual monitoring of ampicillin

Sodium alginate hydrogelation mediated paper-based POCT sensor for visual distance reading and smartphone-assisted colorimetric dual-signal determination of l-lactate

“…For the last few years, smartphones have become colorimetric analytical platforms owing to their excellent shooting functions and their powerful image processing application software, 39 including ColorDesk and ColorPicker, which are widely used as color recognition software that could automatically and spontaneously convert any captured colors into values of RGB (red, green, blue), which could be converted into the concentrations of analytes further. 40–42 For instance, Lu et al 43 built an integrated intelligent detection platform, which simply combined the nanozyme reaction with a smartphone application software to detect ampicillin (AMP). Yang et al 44 combined a smartphone with fluorescent hydrogel microspheres to detect lactate.…”

Synthesis of pH-Sensitive Nitrogen-Doped Carbon Dots with Biological Imaging Function and Their Application in Cu2+ and Fe2+ Determination by Ratiometric Fluorescent Probes

“…Carbon dots (CDs) are carbon-based nanomaterials that have excellent optical properties, high chemical stability, good biocompatibility, and low toxicity; hence, they have broad application prospects in biological imaging, , sensing, – drug delivery, , and photocatalysis. , In this way, CDs have attracted increasing attention of researchers worldwide. , The methods for the preparation of CDs include arc discharge, , laser ablation, electrochemical oxidation, chemical oxidation, microwave-assisted, – and hydrothermal ,, methods. Among them, the hydrothermal method is simple and eco-friendly and does not require a complicated technology or special equipment. , Eco-friendly carbon sources (eggs, banana peel, papaya seeds, milk, , and leaves) are widely used for the preparation of CDs .…”

Calcium Fluoride/Manganese Dioxide Nanocomposite with Dual Enzyme-like Activities for Uric Acid Sensing: A Comparative Study of Enzyme and Nonenzyme Methods

“…It is important to note that the colorimetry is perfectly consistent with the aforementioned conditions, as it may detect UA visually by observing the change in color. For example, traditional devices (e.g., spectrophotometers) and even smartphones can detect UA by swiftly capturing colorimetric shifts to visually observe color changes . Approaches for the detection of UA can be divided into enzyme methods and nonenzyme methods depending on whether the natural enzyme (uricase) is used in the detection system.…”

“…For example, traditional devices (e.g., spectrophotometers) and even smartphones can detect UA by swiftly capturing colorimetric shifts to visually observe color changes. 16 Approaches for the detection of UA can be divided into for the optimization of peroxidase-like activity, which combined with uricase to create a cascade reaction system for assessing UA levels in human urine specimens. 17 Nonenzyme methods are established using the principle that UA can induce nanomaterial etching or chromogenic substrate fading to produce color shifts.…”