in this assay, edible cattle tissues from local markets of ardabil, a province of iran, were examined for residues of tetracycline antibiotics (tetracycline, oxytetracycline and chlortetracycline). in total, 110 samples of triceps, gluteal muscle, diaphragm, kidney and liver were randomly obtained from the local markets of the city of ardabil. solid-phase extraction (spe) and high-performance l...

aquatic plants have been used prevalently in china since 3000 years ago due to having various chemical compounds for diseases prevention and cure. dunaliella salina is one of the micro algae in marine ecosystems containing beta-carotene, retinal, apocarotenoides, ketones, aldehydes and epoxides which enable it to absorb free radicals and produce singlet oxygen.  in many studies, the anti-cancer...

is a useful method. Although there have been some reports9~11) on the HPLC analysis of PGs and TX using 9-anthryldiazomethane (ADAM), these methods have less sensitivity than HPLC for the quantitative determination of PGs and TX in human plasma. The purpose of this investigation was to establish an HPLC method for the determination of PGs and TX in biological samples. For the analysis of PGs an...

Solid-state extraction of plasma or serum offers significant advantages over traditional liquid-liquid methods in cortisol determinations by liquid chromatography (HPLC). Sample preparation is facilitated and HPLC column contamination is minimized. Extract yield from the solid-state columns is enhanced by sample pretreatment with methanol. Cortisol values by solid-state extraction/HPLC correlat...