a new method for the determination of trace copper(ii) in food samples by cloud point extraction(cpe) combined with flame atomic absorption spectrometry(faas) is presented and evaluated. the method is based on the fact that hydrophobic complex of copper(ii) with sodium diethyldithiocarbamate (ddtc) was formed at ph 6.0 and subsequently the hydrophobic complex was extracted into surfactant-rich ...

reactions of free radicals and reactive oxygen species (ros) with biological molecules in vivo play an important physiological role in many diseases. 2,2-diphenyl-1-picrylhydrazyl (dpph) is a stable free radical and often used as a routine reagent to evaluate the antioxidant capacity of an antioxidant. this study was undertaken to investigate the free radical-scavenging and antioxidant activiti...

a new method for analysis of trace amount of rh(iii) ions by magnetic activated carbon modified with 2,3,5,6-tetra(2-pyridyl)pyrazine (mac/tppz) as the magnetic sorbent has been proposed. the proposed adsorbent was found to be advantageous over conventional solid phase extraction (spe) in terms of operational simplicity and low time-consuming. the experimental parameters affecting the extractio...

in the present study, the concentrations of three heavy metals including lead (pb), zinc (zn) and arsenic (as) in 72 different honey samples collected from north-western regions of iran were investigated using atomic absorption spectroscopy method. all metals were detected in 88.88% of the honey samples. the range of metals contamination in honey samples was 0.01 to 11.09 ppm. zn was the most a...

entomopathogenic fungi produce secondary metabolites which may bioactively help fungus in its virulence toward insect hosts. beauveria bassiana produces several toxic low molecular compounds in vitro as well as in vivo, the most important of them is beauvericin. the beh isolate of the fungus was selected for beauvericin assay. beauvericin was obtained from surface and submerged cultures of the ...

abstractbackground : the presence of primordial radionuclide in human habitats has always been a source of prolonged exposure. measurement of naturally occurring radionuclides in the environment can be used as baseline to evaluate the impact of non-nuclear activities and also routine releases from nuclear installations.   materials and methods: a total of 56 samples from 18 different foodstuff ...

Introduction Foodstuffs are known to contain natural and artificial radionuclides. Determination of radionuclide concentration is of great significance for the protection of human health. The main objective of the present study was the quantification of radionuclides in tea samples, cultivated in Guilan Province in North of Iran. Materials and Methods The activity concentrations of 226Ra, 232Th...