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...

Rapid, precise, accurate, and specific ratiospectra derivative spectrophotometry and a simple UV spectrophotometry using simultaneous equation methods are developed for the simultaneous determination of bisoprolol fumarate and hydrochlorothiazide from combined pharmaceutical dosage forms. For ratiospectra derivative spectrophotometry, the amplitudes were measured at 202.6 nm for bisoprolol fuma...

in the present work, the znfe2o4 nanoparticle has been successfully synthesized. the obtained sample was characterized by x-ray diffraction (xrd), emission scanning electron microscopy (fe-sem) and its optical property was examined by uv-vis spectrophotometer. fe-sem revealed that the particle size of the znfe2o4 of about 47 nm was synthesized. the photocatalytic performance under uv-vis and vi...

The present study aimed to characterize melanin pigment extracted from Gluconobacter oxydans FBFS 97. After 14 days of culture at 28 °C in GY (glucose and yeast extract) liquid-state medium, G. FBFS97 produce the maximum melanin, up about 12–15 mg/L. physicochemical characteristics showed an ability dissolve 1 mol/L NaOH or KOH, insolubility water most organic solvents, such as chloroform petro...

Environmental pollution caused by heavy metal ions has become a major health problem across the world. In this study, selective colorimetric sensor based on starch functionalized silver nanoparticles (St-Ag NPs) for rapid detection of Hg2+ in real samples was developed. The environmentally friendly green approach utilized to synthesize (St-AgNPs). A multi-technique involving UV-Vis absorption s...

The modification of high-performance liquid chromatography parameters leads to a more effective oligonucleotide-A purification process. Using various experimental such as buffer, concentration, and pH, method for optimizing the an on reverse-phase C18 column was created. To purify oligonucleotide-A, High-Performance Liquid Chromatography (HPLC), Ultraviolet-Visible Spectrophotometry (UV-Vis), C...

To develop and validate HPLC UV-visible spectroscopy methods for the determination of Thymoquinone (TMQ) content in different solvent extracts N. sativa L. seed. The evaluation free radical scavenging effect TMQ was investigated. Extraction done by adding 20 mL (hexane, methanol, ethanol, ethyl acetate, water) to 1 g blackseed a conical flask, respectively. mixtures were then incubated water ba...

Abstract This paper explores the cleaning efficacy of polyethylene-supported 15-min photo-crosslinked poly (acrylamide-co-benzophenone) surface-attached gels (SAGs) on gypsum plaster surface models inspired by nineteenth-century casts. Cleaning tests were performed with and without organic inorganic coatings, which had been exposed to accelerated ageing heat, humidity, light after artificial so...