Results 1 to 10 of about 219,483 (269)
Measurement of the coordination effect of polyphenols used in oil field by colorimetric method [PDF]
E3S Web of Conferences, 2021 Polyphenols are widely used in drilling fluid, cement slurry and water treatment in oil fields. The paper is based on the characteristics of the abundant phenolic hydroxyl groups in plant polyphenol compounds that can form stable complexes with iron ions,
Tian Wen +6 more
doaj +1 more source
Deployable Lab-on-a-Chip Sensor for Colorimetric Measurements
Micromachines, 2023 The infield measurement of nutrients, heavy metals, and other contaminants in water is still a needed tool in environmental sciences. The Lab-on-a-chip approach can develop deployable instruments that use the standardized analytical assay in a ...
Stefan Gassmann +2 more
doaj +1 more source
Frontiers in Microbiology, 2021 The global food waste problem, especially aquatic product spoilage, stimulates the accurate freshness analysis of food products. However, it still remains a great challenge to realize in-field determination of fish freshness at the time of use.
Chen Guo +4 more
doaj +1 more source
Frontiers in Chemistry, 2021 Herein, selenium and nitrogen co-doped carbon quantum dots (Se/N-CQDs) were hydrothermally synthesized by using citric acid, histidine, and sodium selenite, which had sp3 and sp2 hybridized carbon atoms and showed excitation-dependent fluorescence ...
Qinhai Xu +3 more
doaj +1 more source
A multi-functional chemosensor for highly selective ratiometric fluorescent detection of silver(I) ion and dual turn-on fluorescent and colorimetric detection of sulfide [PDF]
Royal Society Open Science, 2018 A multi-functional chemosensor 1 as silver and sulfide detector was synthesized by the combination of octopamine and 4-dimethylaminocinnamaldehyde. Sensor 1 exhibited a ratiometric fluorescence emission for Ag+ from blue to sky. The binding mode of 1 and
Ji Hye Kang +2 more
doaj +1 more source
Sensors, 2023 Fluorescent nitrogen and sulfur co-doped carbon dots (NSCDs) were synthesized using a simple one-step hydrothermal method starting from o-phenylenediamine (OPD) and ammonium sulfide. The prepared NSCDs presented a selective dual optical response to Cu(II)
Roberto Pizzoferrato +4 more
doaj +1 more source
Diagnostics, 2023 Quick and reliable mass testing of infected people is an effective tool for the contingency of SARS-CoV-2. During the COVID-19 pandemic, Point-of-Care (POC) tests using Loop-Mediated Isothermal Amplification (LAMP) arose as a useful diagnostic tool. LAMP
Bruna W. Raddatz +16 more
doaj +1 more source
Frontiers in Chemistry, 2020 Platinum nanozymes exhibiting highly efficient and robust oxidase-like activity are successfully synthesized and modified using sodium alginate (SA-PtNPs). According to a steady-state dynamic assay, Michaelis-Menton constant (Km) is calculated as 11.6 μM,
Shao-Bin He +7 more
doaj +1 more source
Wearable Sensors for the Detection of Biomarkers for Wound Infection
Biosensors, 2021 Infection represents a major complication that can affect wound healing in any type of wound, especially in chronic ones. There are currently certain limitations to the methods that are used for establishing a clinical diagnosis of wound infection. Thus,
Alexandra Pusta +3 more
doaj +1 more source
Recent Advancements in Enzyme-Based Lateral Flow Immunoassays
Sensors, 2021 Paper-based lateral-flow immunoassays (LFIAs) have achieved considerable commercial success and their impact in diagnostics is continuously growing. LFIA results are often obtained by visualizing by the naked eye color changes in given areas, providing a
Donato Calabria +10 more
doaj +1 more source