Honey contains various compounds that function as antioxidants, one of which is phenolic compounds. The purpose this study was to determine the correlation between content multiflora honey from Malang and Alastuwo on antioxidant activity using DPPH method (2,2-Diphenyl-1-picrylhydrazyl). Qualitative test with FeCl3 color reagent, determination total by UV-Vis spectrophotometry Folin-Ciocalteu r...

Molecular imprinting techniques have reached tremendous importance in the research of new artificial recognition systems. The investigation reports the preparation of Cu (II) ion selective polymer with high specificity and selectivity by molecular imprinting approach. For this 4-vinyl pyridine was chosen as the functional monomer and ethylene glycol dimethacrylate (EGDMA) as the crosslinking ag...

A simple, inexpensive and sensitive kinetic spectrophotometric method was developed for the simultaneous determination of three anti-carcinogenic flavonoids: catechin, quercetin and naringenin, in fruit samples. A yellow chelate product was produced in the presence neocuproine and Cu(I) - a reduction product of the reaction between the flavonoids with Cu(II), and this enabled the quantitative m...

The peculiarities of binding the water-soluble meso-tetra-(4N-oxyethylpyridyl) porphyrin (TOEPyP4) with B-DNA and A-DNA have been studied by means of UV-VIS spectrophotometry and circular dichroism method. The binding constant (Kb) and stoichiometry (n) were determined based on the absorbance spectra for each DNA–porphyrin complex. The free energy, enthalpy and entropy of binding also were calc...

The interaction of 11-mercaptoundecanoic acid capped gold nanoparticles (MUA-GNPs) with europium ions and aminoacids has been studied by UV-Vis spectrophotometry, fluorescence, confocal fluorescence microscopy, resonance light scattering and TEM. Results demonstrated that hyper-Rayleigh scattering emission occurs upon the addition of lysine to the MUA-GNPs-Eu(III) system, thus providing an inhe...

Biologically synthesized nanoparticles have been widely using in the field of medicine. Biogenesis of nanoparticles have proven to be better methods due to slower kinetics and they offer better manipulation and control over crystal growth and their stabilization. The present study revealed that the phytosynthesis of silver nanoparticles from 1 mM AgNO3 solution through the leaf extract of Svens...

In order to compare the catalytic activities of reduced graphene oxide (rGO), graphene oxide (GO), and graphene, we conducted oxidation of 2-aminothiophenol (2-ATP) and reduction of nitrobenzene (NB) in their presence by using high-resolution photoemission spectroscopy (HRPES). In addition, we determined conversion rates of CO to CO2 in the presence of these catalysts by performing a residual g...

Backgrounds and objectives: Myocardial infarction (MI) usually occurs when coronary blood flow decreases abruptly after a thrombotic occlusion of a coronary artery previously affected by atherosclerosis. Sialic acid (SA) is attached to non reducing residues of the carbohydrate chains of glycoproteins and glycolipids. An elevation in serum TSA , LBSA and PBSA concentrations has been observed in ...

The biodegradation of benzo[a]pyrene (BaP) by using Polyporus sp. S133, a white-rot fungus isolated from oil-contaminated soil was investigated. Approximately 73% of the initial concentration of BaP was degraded within 30 d of incubation. The isolation and characterization of 3 metabolites by thin layer chromatography, column chromatography, and UV-vis spectrophotometry in combination with gas ...