Use of Doehlert design for optimizing the digestion of beans for multi-element determination by inductively coupled plasma optical emission spectrometry
Abstract:Neste trabalho a otimização de um procedimento rápido e de baixo custo para digestão ácida de feijão foi desenvolvida. Elementos essenciais (Ca, Cu, Fe, K, Mg, Mn, Ni, P, Zn) e não essenciais (Al, Ba, Sr) foram determinados por espectrometria de emissão óptica com plasma indutivamente acoplado (ICP OES). Foi utilizado planejamento fatorial de dois níveis fracionário com cinco fatores (volumes de HNO 3 e H 2 O 2 , tempo, temperatura do bloco e tamanho de partícula). O fator temperatura foi o parâmetro mais impo… Show more
“…al., 2008). The aim was to optimize the recovery percentage of several elements with respect to the temperature and the volume of concentrated nitric acid from which we take only the recovery percentage of manganese (for details, see (Dos Santos et. al., 2008).…”
Section: Example: Analysis Of a Doehlert Design For Two Variablesmentioning
Varmuza studied chemistry at the Vienna University of Technology in Austria. As one of the pioneers in chemometrics, his research activities in chemoinformatics and chemometrics involve development and applications of methods for spectra-structure relationships (MS and IR), structure-property relationships (QSPR), and classification of materials in archaeometry and cosmo chemistry. Since 1992 he has been a professor at the
“…al., 2008). The aim was to optimize the recovery percentage of several elements with respect to the temperature and the volume of concentrated nitric acid from which we take only the recovery percentage of manganese (for details, see (Dos Santos et. al., 2008).…”
Section: Example: Analysis Of a Doehlert Design For Two Variablesmentioning
Varmuza studied chemistry at the Vienna University of Technology in Austria. As one of the pioneers in chemometrics, his research activities in chemoinformatics and chemometrics involve development and applications of methods for spectra-structure relationships (MS and IR), structure-property relationships (QSPR), and classification of materials in archaeometry and cosmo chemistry. Since 1992 he has been a professor at the
“…However, it is necessary to mention the possible presence of inorganic contaminants in plants, which, although generally inferior to foods of animal origin, should also be investigated, since it poses an imminent risk to health maintenance [18]. In recent work, concentrations of Pb in samples of carioca beans varied between 4.6 and 6.2 μg g −1 [19]. These concentrations are above the maximum tolerance limit (LMT) recommended by the Brazilian legislation for legumes in natura or industrialized (0.50 μg g −1 ) [20].…”
The methods used to estimate the bioavailability of elements have different approaches. These tests are based on selective extraction or simulation of the physiology of the gastrointestinal tract. The sample preparation methods require studies about extraction procedures, thermal treatment, and decomposition of organic matter. The method of decomposing organic matter assisted by microwaves introduced adequate results for most chemical elements in pulses. The content of the elements present in the extracts obtained by employing the method physiologically based extraction test (PBET) is lower than those obtained by simple bioaccessibility extraction test (SBET) due to complexing effects of metal ions. The mineral content in the gastric and intestinal stages can vary significantly with the investigated leguminous species and the elements. The thermal processing can affect the concentrations of the elements analyzed in samples from leguminous species. This results from the heat capacity to change the speciation of chemical elements. The change speciation may modify the solubility and mobility of chemical species under the conditions of the gastrointestinal tract, which alters the bioavailability. In this sense, it can be concluded that the domestic cooking process can influence the nutritional and toxicological potential of pigeon pea, cowpea, and mangalo.
The results highlighted the possibilities offered by the employment of multifactorial optimization towards the improvement of performance of tandem mass spectrometry techniques.
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