The EPR and UV-VIS spectroscopy was used to determine the pH effect on bovine liver catalase. The measurements were made in the pH range from 2 to 10. The positions, shapes and relative intensities of the UVVIS peaks were observed. Spin labelling technique was used to monitor the molecular dynamics of catalase. Treatment with acid or alkaline solutions causes spectral changes which may be due t...

This research has studied equilibrium adsorption isotherms of Ketotifen on carbon nanotube. And also results of experiments through Freundlich,Temkin and Langmuir models have been studied and it has found different parameters of these models for carbon nano-tube adsorbent. According to the error rate for each model, we obtained a good agreement between these data which it showed the best agreem...

In this study, zero-, first-, secondand third-order derivative spectrophotometry methods were developed for the determination of metoprolol in pharmaceutical preparations. In zero order spectrophotometry, absorbance values were measured at 276 nm in zero order spectra of solution of metoprolol in methanol in the range of 240-310 nm. In first derivative spectrophotometry, absorbance values were ...

BACKGROUND Paraquat (PQ) is a world-wide used herbicide and also a type of common poison for suicide and accidental poisoning. Numerous studies have proved that the concentration of serum PQ plays an important role in prognosis. Spectrophotometry, including common spectrophotometry and second-derivative spectrophotometry, is commonly used for PQ detection in primary hospitals. So far, lack of s...

Terdapat beberapa aktifitas biologis dalam daun jarak pagar antara lain sebagai
 antidiabetes dan antihipertensi. Flavonoid adalah senyawa metabolit sekunder yang
 bertanggung jawab terhadap tersebut. Penelitian ini bertujuan untuk
 menghitung kandungan total flavonoid ekstrak pagar, serta
 mengidentifikasi alkaloid, terpenoid, saponin, flavonoid, tanin terdapat pada pagar. ...

Three fluorescent asymmetric bis-urea receptors (L1-L3) have been synthesised. The binding properties of L1-L3 towards different anions (fluoride, acetate, hydrogencarbonate, dihydrogen phosphate, and hydrogen pyrophosphate HPpi3-) have been studied by means of 1H-NMR, UVVis and fluorescence spectroscopies, single crystal X-ray diffraction, and theoretical calculations. In particular, a remarka...

The objectives of this study were to characterize a synthesis brom-isoflavanone (notated IF) with possible pharmacological activities, water insoluble and to examine the potential of beta-cyclodextrin to improve this property and obtain inclusion compounds that were analysed by different techniques: UV-Vis, IR, 1HNMR spectroscopy, thermal analysis. The presence of β-cyclodextrin rises the conte...