We measure optical absorption in color-producing enzymatic reactions for biochemical analysis with a microscale optofluidic device. Cavity-enhanced laser spectrophotometry is performed on analytes within a microfluidic channel at visible wavelengths with silicon nitride microring resonators of 100 µm radius and quality factor of ~180,000. The resonator transmission spectrum is analyzed to deter...

Aim to develop a method for standardization of licorice herb.
 Material and methods. The material the study was herb harvested in Alekseevka settlement Samara Region (2021), Tatarskaya Kargala village Sakmarskiy area Orenburg (2017), Derzhavinsk city Republic Kazakhstan (2018), Bol'shaya Chernigovka Bol'shchernigovsk (2019), commercial sample root raw from AO "Krasnogorskleksredstva". In a...

Visible spectrophotometry is used to study the kinetic of ligand exchange in the system Cu(salpn)/H2salen with or without triethylamine (NEt3) and H2O in acetonitrile solvent at 25 ± 0.1°C and 0.01 M NaNO3 (H2salen and H2salpn are N,N'-ethylen-bis(salicylaldimine) and N,N'-propylen-bis(salicylaldimine), respectively). It is found that the reaction rate is first-order with respect to Cu(salpn). ...

The influence of water on the interaction between iron(III) and indole-3-acetic acid (IAA) was studied in different organic solutions using rapid-scan stoppedflow spectrophotometry and rapid-freeze/quench Mössbauer spectroscopy. Measurements were also performed in ethanol– water and acetone–water mixtures. The results showed that the interaction between Fe and IAA resulted in dimeric Fe–IAA com...

Accepted: May 25, 2011; Published: August 30, 2011 Abstract The adsorption and transformation of K2Cr2O7 at natural hermit crab shell powder was studied by UV-visible spectrophotometry. K2Cr2O7 is adsorbed at natural hermit crab shell powder, and follows the Freundlich adsorption model with the adsorption constant of KF=888.8 and adsorption free energy change of 16.83 kJ.mol . The adsorbed K2Cr...

Thiocolchicoside is a centrally acting muscle relaxant and used in combination with many NSAIDs for the treatment of various musculoskeletal disorders. As it is less sedative than other centrally acting muscle relaxants hence frequently prescribed for low back pain (LBP), orthopedic, traumatic and rheumatologic disorders. It is available in market in single component and as multicomponent formu...

An electrochemical sensor for amperometric detection of hydroxylamine was developed by electrodeposition of hybrid copper-cobalt hexacyanoferrate films on a glassy carbon electrode. The modified electrode could reduce the overpotential of the hydroxylamine oxidation by about 400 mV. This sensor exhibited a linear relationship between the response current and the hydroxylamine concentration in t...

In the present work, TiO2 nanoparticle and multi-walled carbon nanotubes composite powder is prepared hydrothermally. After doctor blading the paste from composite powder, the resulted composite film is sensitized with Cu-based metal-organic frameworks using a layer-by-layer deposition technique and the film is characterized using FE-SEM, EDX, XRD, UV/Visible spectrophotometry and photoluminesc...

* Corresponding Author: Tel.: +91 9436508446; fax: +91 3812374802. E-mail address: [email protected]; [email protected] Abstract Interaction of pinacyanol chloride (PIN) with anionic surfactants at premicellar and postmicellar concentration range was studied by visible spectrophotometry and these interaction produces a blue shift metachromatic band (at ~ 490 nm), which gradually shifted t...

Aim to develop a methodology for qualitative and quantitative analysis of flavonoids in the herb Achillea millefolium L.
 Material methods. The material study was yarrow harvested 2020 2021, an industrial sample from JSC "Krasnogorskleksredstva". Additionally, we used reference samples flavonoids: rutin, quercetin, kaempferol, cynaroside, luteolin, received previously during our studies ra...