نتایج جستجو برای: microwave digestion
تعداد نتایج: 86421 فیلتر نتایج به سال:
lawsone a natural pigment present in the henna leaves has been used as a skin and hair dye since 1400 bc. the concentration of this natural compound in leaves varies from place to place depending upon many of the environmental factors and the highest quantity reported so far is about 1% of the dry mass. heretofore, it has been reported that natural colored extracts and isolate from henna leaves...
Hydride generation atomic absorption spectrometry (HGAAS) was applied for determination of selenium content in dried aerial parts of wild and cultivated Teucrium species (Lamiaceae) growing in Croatia: T. arduini L., T. chamaedrys L., T. flavum L., T. montanum L., T. polium L., and T. scordium L. subsp. scordioides Schreb. Special attention was paid to the wet oxidation procedure for the sample...
The present study was carried out to quantitatively analyze the levels of six potentially toxic heavy metals viz., arsenic (As), lead (Pb), cadmium (Cd), mercury (Hg), chromium (Cr) and nickel (Ni) in ten important Indian medicinal plants. The air dried powdered plant materials were subjected to microwave assisted wet digestion for the preparation of test samples. The samples were analyzed by u...
Accelerated proteolytic cleavage of proteins under controlled microwave irradiation has been achieved. Selective peptide fragmentation by endoproteases trypsin or lysine C led to smaller peptides that were analyzed by matrix-assisted laser desorption ionization (MALDI) or liquid chromatography-electrospray ionization (LC-ESI) techniques. The efficacy of this technique for protein mapping was de...
A procedure based on radiochemical neutron activation analysis was developed for the determination of chromium in biological materials. The procedure consists of irradiation of reference and test samples in a nuclear reactor, microwave sample digestion, selective and quantitative radiochemical separations of chromium and gamma-ray spectrometric measurement of 51Cr. Separation of chromium from t...
Recent studies have demonstrated that 30% of the world’s population suffers anemia, half cases are related to iron deficiency, and most common treatment is use supplementation. In this framework, zinc determination from different dietary supplements was performed by flame atomic absorption spectrophotometry. Concerning dissolution supplements, direct acid dissolution, wet digestion, microwave d...
A new selenized yeast reference material (SELM-1) produced by the Institute for National Measurement Standards, National Research Council of Canada (INMS, NRC) certified for total selenium (2,059+/-64 mg kg(-1)), methionine (Met, 5,758+/-277 mg kg(-1)) and selenomethionine (SeMet, 3,431+/-157 mg kg(-1)) content is described. The +/-value represents an expanded uncertainty with a coverage factor...
Iron, copper, zinc, manganese, nickel, cobalt, lead, cadmium and chromium in various apricot soil samples were determined by atomic absorption spectrometry this study. Microwave digestion method wet ashing efficiency compared for of the samples. Recovery values nearly found quantitative. The analysis results evaluated. accuracy procedures was confirmed analyzing Montana Soil Apple Leaves certif...
Municipal solid waste incineration fly ash is generated in a significant amount; it is classified as hazardous waste in Taiwan. In order to reduce the volume of treated fly ash, a sintering technology can be considered. However, a traditional sintering consumes too much energy because of the limit of heat transfer. Hence, a microwave process which can provide quick, uniform, and selective heati...
The nonenzymatic digestion of proteins by microwave D-cleavage is an effective technique for site-specific cleavage at aspartic acid (D). This specific cleavage C-terminal to D residues leads to inherently large peptides (15-25 amino acids) that are usually relatively highly charged (above +3) when ionized by electrospray ionization (ESI) due to the presence of several basic amino acids within ...
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