The titration of methanobactin with Cu(II) was monitored by both UV/Vis and NMR spectroscopy and indicates that the major transitions occurring when Cu(II) interacts with methanobactin involve a two-step process that is complete by about 0.6 Cu:mb. This suggests that a 2:1 complex is formed between methanobactin and copper at low copper levels. If this complex exists, it would be different than...

Numerical taxonomy characterization of Baccharis genus species was performed using ultraviolet-visible spectrophotometry. The aim was to present a more convenient, more practical, more economic and faster method based on chemometric methods and UV-vis absorbance to give the most information about species identity and discrimination, especially when their classification has been doubtful. Three ...

The detection and assay of vitamin B-2 (riboflavin) was accomplished under aqueous conditions using sodium borate buffering at pH 7.52 conditions. The absorbance spectrum of riboflavin was determined at different pH values utilizing several buffers. The buffer at pH at 7.52 is followed by accurate and sensitive assay of riboflavin by spectrophotometer at 440 nm wavelength. Where indicated an or...

Abstract Since the 2017 REACH restrictions on hexavalent chromium, aeronautics industries have been seeking substitute processes for chromium plating. So far, use of trivalent chromium-based precursors seems to be best solution in terms process adaptation. The development such requires a better understanding plating bath chemistry. More specifically, there is need characterize complexation mech...

Measurement methods for determining the density of compressed materials, being a critical quality attribute, provide an important parameter successful processing. In this study, novel approach was developed compacts using ultraviolet–visible spectrophotometry. The assumption within context that change in affects corresponding color information compact. From obtained spectra visible range, compa...

We report the demonstration of a scanning probe coherent diffractive imaging method (also known as ptychographic CDI) using a compact and partially coherent gas-discharge plasma source of extreme ultraviolet (EUV) radiation at a 17.3 nm wavelength. Until now, CDI has been mainly carried out with coherent, high-brightness light sources, such as third generation synchrotrons, x-ray free-electron ...

Atomic absorption technique is used to determine losartan potassiumthrough the quantitative detection of potassium (K) element in drug.the extraction was carried out by acid digestion and percentagerecovery 97.2%, error percentage -2.8, limit 0.038 μg/ml, relative standard deviation did not exceed 2.58%. The resultswere compared with UV-Visible method 96.5%, 0.93 μg / ml relativestandard more t...