The simplified acid peroxydisulphate digestion of soil water extract was evaluated for determination of total dis solved phosphorus by molybdenum-blue colorimetry in comparison with direct P-detection in water extract by the ICP-AES technique. The research was conducted on 79 agricultural soils with different agrochemical characteristics. The results of the colorimetric P detection in water ext...

Nanozyme-based chemical sensing is a rapidly emerging field of research. Herein, a simple colorimetric assay for the detection of hydrogen peroxide and glucose based on the peroxidase-like activity of V₂O₅ nanozymes has been established. In this assay, the effects of pH, substrate, nanozyme concentrations and buffer solution have been investigated. It was found that compared with 3,3',5,5'-tetr...

Episulfides were determined by a simple colorimetric assay using 4-(p-nitrobenzyl)-pyridine, which has been used previously for the detection and analysis of epoxides, organophosphates, and other alkylating agents. With episulfides, absorbance was directly proportional to concentration up to an absorbance of at least 1.0. No interference was observed with a variety of non-episulfide sulfur-cont...

Abstract Sweat analysis is a non-invasive, simple, and convenient means of disease detection, which extremely useful in human daily supervision. This work demonstrates the design nanosilica biosensor for sensitive, low-cost colorimetric sensing glucose pH sweat. The biosensing interface was prepared by chemical vapor deposition, surface modification, superwettable patterning, regions functional...

Antibodies against Mycoplasma gallisepticum (M. gallisepticum) block the antigenic epitopes of bioaptamer-binding to PvpA protein, resulting in a lighter colorimetric detection.

Herein we introduce an enzyme-free and amplified colorimetric detection strategy, which is based on gold nanoparticle (AuNP) aggregation through target-catalytic DNA circuits (HCR and CHA).

An indole-azadiene conjugate (1), synthesized by facile one-step condensation, behaves as a highly selective probe for detection of fluoride ion both in colorimetric and fluorometric analyses. The probe 1 shows F(-)-selective color change from colorless to yellow and appearance of green fluorescence. 1H NMR analysis and ab initio calculation reveal that the F(-)-induced colorimetric and fluorom...

The discovery of the DNA-mediated assembly of gold nanoparticles was a great moment in the history of science; this understanding and chemical control enabled the rational design of functional nanomaterials as novel probes in biodetection. In contrast with conventional probes such as organic dyes, gold nanoparticles exhibit high photostability and unique size-dependent optical properties. Becau...

A new colorimetric and fluorescent probe was reported, which can be used in a very low dosage (<20 nM) for rapid, highly selective and sensitive detection of biothiols.

A new ratiometric and colorimetric fluorescent probe for the highly selective, sensitive and facile detection of Hg(2+) has been rationally developed.