Current Analytical Chemistry - Volume 5, Issue 4, 2009

The antioxidant activity of honey varies greatly depending on the honey's floral source. There is little knowledge about the profiles of antioxidant substances in honey from different floral sources. The variation in these profiles might be responsible for the widely varying ability of honey to protect against oxidative reactions. Honey is rich in polyphenol compounds, which act as natural antioxidants, and are becoming increas Read More

Copper(II) hexacyanoferrate(III) (CuHCF) modified carbon paste electrode was used for the electroanalytical determination of dipyrone and acetaminophen in pharmaceutical preparations by cyclic voltammetry. Several parameters were investigated for the optimization of the sensor such as composition of the electrode, electrolytic solution, effect of pH, scan rate of potential and interference. The best conditions wer Read More

In this contribution, the rapid and simple determination of vitamins A and E, and vitamin E acetate as internal standard in human plasma by high-performance liquid chromatography with a column-switching technique was proposed. Restricted Access Material - RAM column 25 x 4 mm containing 25 μm C18 alkyl-diol silica support was integrated into lab-made column-switching HPLC system. A monolithic column Chrom Read More

A method for the determination and quantification of collagen types (I - V) using sample pretreatment has been developed. This work is a continuation of our previous work dealing with the determination of collagen types I and III in tissues [1]. The tissues (rat placenta and porcine cartilage) were firstly homogenized with a pestle in a grinding mortar with liquid nitrogen. Collagens were isolated from these tissues by Read More

A novel dispersive liquid phase microextraction using a new temperature-controlled ionic liquid 1-isooctyl-3- methylimidazolium hexafluorophosphate was proposed as novel medium for the determination of dicofol and DDT in environmental water. For one new extraction, a 1.0 ml methanol solution containing 250 mg of the ionic liquid was sprayed into 25 ml of water sample. Meantime the ionic liquid will rap Read More

Full text available

Gas chromatographic analysis of Aromatic Sulfur Compounds in distilled water and seawater samples has been performed after adsorption from 100 mL water sample onto a cartridge containing a mixture of 50 mg NH2- and 50 mg C18-bonded porous silica. The Aromatic Sulfur Compounds are desorbed with a mixture of acetone-trichloromethane (1:1), which is concentrated and analysed by gas-chromatography coupled to Read More

In this paper, a method for the determination of ILs, specifically 1-butyl-3-methyl imidazolium bromide( BMIB), was developped using mercaptoacetic acid (MAA) capped CdTe QDs as fluorescence probe. Under optimum conditions, the enhancement of fluorescence intensity of CdTe QDs was linearly in proportion to the concentration of BMIBin the range of 9.1x10-5-1.1x10-2 mol L-1 with a correlation coefficient of 0.9 Read More

Nano-silver coated silica gel was impregnated with ammonium pyrrolidine-dithiocarbamate (APDC) and used for the separation and preconcentration of lead prior to its determination by flame atomic absorption spectrometry. The silver coated silica gel was prepared by mixing slurried silica gel with solid silver nitrate and sodium boron hydride. The silver coated silica gel was then impregnated with ammonium p Read More

This study focuses on the photoluminescence properties of loracarbef (LOR) ligand and its [Zn(LOR) (H2O)(Cl)]Cl, [Cd(LOR)(H2O)(Cl)]Cl, [Ni(LOR)(H2O)(Cl)]Cl, [Pd(LOR)(H2O)(AcO)]AcO and [Pt(LOR)(H2O)(Cl)]Cl complexes. LOR and the resulting metal complexes gave an intense emission (where λmax = 376 nm) upon irradiation by Ultra-Violet light. The photoluminescence quantum yields and long excited-state lifetimes of Read More