Stability study of ceftazidime was realized in order to investigate kinetics of degradation of this drug both in powder for injection and reconstituted sample. Ceftazidime was submitted to conditions of accelerated thermal degradation and photodegradation. Analyses of the degraded samples were performed by microbiological assay and decomposition reactions could be described by zero-order and se...

Bladder pain is a characteristic disorder of interstitial cystitis. Diazepam is well known for its antispasmodic activity in the treatment of muscular hypertonus. The aim of this work was to develop and characterize vaginal pessaries as an intravaginal delivery system of diazepam for the treatment of interstitial cystitis. In particular, the performance of two types of formulations, with and wi...

o-Nitrobenzyl-based photolabile surfaces 3 and 4 have been synthesized from 2-phenylcyclohexanone and aminopropylsiloxane-grafted controlled pore glass. The procedures are simple and inexpensive and generate materials whose minimally functionalized reactive chromophore should tolerate a range of subsequent chemistries. Time- and solvent-dependent analysis of photodegradation demonstrates a perf...

A facile method was used for the synthesis of CNTs@TiO2 nanocomposites using a simple apparatus at ambient pressure and temperature. CNTs@TiO2 exhibit core-shell structure without any interfacial adhesive layer on the CNT surface. The photodegradation of methyl orange suggests enhanced photoactivity of CNTs@TiO2 under UV light. The morphology, structure and composition of CNTs@TiO2 were also in...

The photodegradation of the azobenzene chromophore DR1 {4-[N-ethyl-N-(2-hydroxyethyl)amino]-4(?)-nitroazobenzene]} incorporated as a side chain or as a guest in a poly(methyl) methacrylate host has been evaluated as a function of wavelength, temperature, and the atmospheric environment. The effects of these variables on the lifetime of DR1-based electro-optic devices is quantified.

Rates of litter decomposition in dryland ecosystems are consistently underestimated by decomposition models driven by temperature, moisture, and litter chemistry. The most common explanation for this pattern is that ultraviolet radiation (UV) increases decomposition through photodegradation of the litter lignin fraction. Alternatively, UV could increase decomposition through effects on microbia...

background and purpose: highly consumption of antibiotics and their entrance into the environment has increased concerns all over the world. these compounds enter to the environment through an incomplete metabolism and a considerable amount of them cannot be removed using usual waste filtration systems. therefore, the present study aimed to investigate the feasibility of using ultraviolet radia...

in this paper cufe2o4, nanocrystalline powders were prepared. also, the supported cu ferrite was obtained by impregnation of the supports with cu and fe nitrates solutions, for calcination temperature 450 ºc. the samples were characterized by x-ray powder diffraction (xrd) and fourier transform-infrared spectroscopy (ft-ir). photocatalytic degradation of acid red 206 in water was studied. cufe2...

The extraction process of bioactives from the aqueous extract cinnamon (Cinnamomum verum) was optimized using Design Expert 11 program and analysis variance (ANOVA) by considering following parameters: weight (g), power (W), time (s) microwave irradiation. optimal conditions are 4.5 grams, 600 seconds, 150 watts With Cinnamomum verum under titanium (IV) tetrachloride as a precursor, TiO2 nanost...

Platonin (4,4'-dimethyl-3,3'-di-n-heptyl-8-[2-(4methyl-3-n-heptylthiazole)] -2,2'-dicarbocyanine diiodine) is one of the photosensitive trithiazolepentamethine cyanine dyes. Visible light (VL)-promoted photodegradation products of platonin in an aqueous environment were identified as 3-heptyl4-methylthiazoline-2 -carbaldehyde (1), tetradecane-7-thiol (2), 1-nonene (3), heptylamine (4), 3-heptyl...