Fexofenadine hydrochloride (FFN), (±)-4-[1-hydroxy-4[4-(hydroxydiphenylmethyl)-1-piperidinyl]-butyl] α,α-dimethylbenzeneacetic acid hydrochloride, is a second-generation antihistamine that is used to treat allergies. The drug is highly hydrophobic and slightly soluble in water. Cyclodextrins are widely used to improve the physicochemical and pharmaceutical properties such as solubility, stability, and bioavailability of poorly soluble drug molecules.Cyclodextrins can molecularly encapsulate various drugs into their hydrophobic cavity without forming any covalent bonds. Cyclodextrin (CDs), especially ß-Cyclodextrin (ß-CD), are widely used in the pharmaceutical field due to its ability to stabilize drug molecules and taste masking purposes. The phase solubility study was performed according to the method of Higuchi and Connors by adding the fexofenadine hydrochloride in excess to different concentrations of cyclodextrin solutions. Phase solubility study records show that the stability constant and complex stoichiometry of FFN-CD complexes increases linearly with CD concentration. Also, an increase in the concentration of β-cyclodextrin leads to an increase in the aqueous solubility of FFN. Complexes were analyzed by UV-VIS spectroscopy using the calibration curve of FFN. Also, UV-VIS spectra indicate a bathochromic shift which proves that complex formation has occurred.Solid inclusion complexes of fexofenadine/β-cyclodextrin and its derivatives were prepared at the molar ratios of 1:1 by the physical mixing method. Characterization of the complexes was performed by using infrared spectroscopy. 

Lignit je mrki ugalj koji u svom sastavu sadrži huminsku kiselinu. Izolacija huminskih kiselina je vrsena iz prethodno oksidovanog i osusenog lignita nakon cega je vrseno preciscavanje. Identifikacija tako dobivenih huminskih kiselina vrsena je FTIR spektroskopijom, a njena karakterizacija UV analizom gde je određivana opticka gustina izolovane huminske kiseline i izvrsena njena kompleksacija sa metalnim katjonima. Podaci dobiveni FTIR spektro­skop­skom analizom za izolovanu huminsku kiselinu ne pokazuju znacajnu strukturnu i hemijsku razliku u odnosu na spektar dobiven za standardnu huminsku kiselinu (Sigma–Aldrich). UV analizom je utvrđeno da izolovana i standardna huminska kiselina imaju E 4 /E 6 odnos u odgovarajucem opsegu od 3–5, sto indicira prisustvo veceg broja alifatskih struktura. Na osnovu stepena humifikacije utvrđeno je da izolovane huminske kiseline pripadaju tipu B dok standardne huminske kiseline pripadaju tipu A. Kompleksacija huminskih kiselina je vrsena rastvorima razlicitih koncentracija nitratnih soli metala i pri razlicitim pH vrednos­tima. Kolicina slobodnog metala merena je metodom ICP-OES. Podaci su analizirani i ANOVA statistickom metodom. Rezultati su pokazali da se povecanjem pH vrednosti sma­njuje koncentracija metalnog jona adsorbovanog na huminsku kiselinu dok se povecanjem koncentracije metala i kolicine huminske kiseline ta moc povecava. Istraživanjem je utvr­đen sledeci niz vezivanja metala za huminsku kiselinu Pb>Zn>Ni>Cu.

Aims: An important property of micelles with particular significance in pharmacy is their ability to increase the solubility of poorly soluble drugs in water thus increasing their bioavailability. It was of interest to increase the solubility of carbamazepine (CBZ) in aqueous media. Therefore, solubilization of carbamazepine (CBZ) in variety of surfactants was investigated. Study Design: In this work the solubilization of carbamazepine (CBZ) was studied in micellar solutions of different anionic and cationic surfactants.

Positive health effects of integral cereals consuming is attributed to bioactive substances. This research is conducted to test antioxidant water extract capacity of different kinds of cereals, compared to the values of total phenols. The total antioxidant capacity was estimated by FRAP assay. The total phenolic content was measured by Folin-Ciocalteau assay. Antioxidant capacity amounted 50,04–385,71 μmol Fe II /L of extract, and values of total phenols 2,95–20,35 mg GA equiv/L of extract on 20°C. The increase of temperature reaction (40°C) resulted in increased content of total phenols in extract and higher value of antioxidant capacity in all extracts. There was significant linear corelation between total phenolic content and FRAP.