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A novel approach for determination of phytic acid in cereals has been applied in 2 traditional methods. In the first, phytic acid in a sample extract is first separated and concentrated by ion-exchange chromatography. The phytic acid concentrate is then quantitatively determined as phosphorus by inductively coupled plasma atomic emission spectrometry (ICP-AES). In the second method, extracted phytic acid is first precipitated by FeCl3 solution. The complexed iron is converted to ferric hydroxide by adding NaOH, thus releasing phytic acid as soluble sodium phytate. Phytate is then quantitatively determined as phosphorus by ICP-AES. In these methods, both the difficult acid digestion and the spectrometric determination of phosphorus found in traditional methods are eliminated by using ICP-AES. This results in a method that is simpler, faster, and more accurate than earlier procedures.
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PMID:Determination of phytic acid in cereals using ICP-AES to determine phosphorus. 202 74

Some ambiguity is still involved in the interpretation of the growth mechanism of monodispersed hematite (alpha-Fe2O3) particles in dilute FeCl3 solutions. Namely, there are two entirely different proposals on this issue, viz. aggregation of preformed primary particles of alpha-Fe2O3 itself and reprecipitation of the ionic species through dissolution of the preformed beta-FeOOH particles. In order to resolve this problem, the formation process was followed in detail through TEM, Electron Diffraction, XRD, FT-IR, and ICP spectrometry along with quantitative analyses on seed effects. As a result, it has been concluded that the nuclei of the hematite particles are initially generated with the formation of beta-FeOOH particles and that they are grown by deposition of the solute originally present in the solution phase and indirectly furnished from the beta-FeOOH by dissolution. As the concentration of the solute is lowered by the growth of the hematite particles, they continue to grow with the solute provided mainly from the beta-FeOOH in a steady-state of the dissolution of beta-FeOOH and growth of alpha-Fe2O3. The basic formation mechanism is common to the ellipsoidal particles grown in the presence of phosphate ions and spherical particles in their absence.
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PMID:Formation Mechanism of Monodispersed alpha-Fe2O3 Particles in Dilute FeCl3 Solutions 897 68

Conducting polypyrrole (PPy) powder synthesized by using FeCl3 x 6 H2O and/or Fe(NO3)3 oxidants was impregnated in silver salt solutions. The stability and decomposition of the material was followed by thermogravimetric measurements. The total silver content was determined by atom absorption spectroscopy (ICP-AAS). The heat and electric conductivities of the composites were measured and correlated with the silver content. The incorporated silver was speciated and measured by X-ray diffraction (XRD). The spectra proved that the chemical state of the silver incorporated into the composite depends on the anion used in the polymerization process. In the case of the polymerization in a nitrate ion containing solution, the impregnation leads exclusively to the formation of metallic silver. The size distribution of the AgCl and Ag nanoparticles, determined from transmission electron microscopy (TEM) pictures in the different composites, proves the formation of a rather uniform species below 10 and 7 nm, respectively. The observations can be correlated with the different interactions in the PPy-chloride/nitrate-silver systems. The redox type interaction based conclusions can be considered as a guide during the preparation of other metal-conducting polymer composites.
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PMID:Characterization of polypyrrole-silver nanocomposites prepared in the presence of different dopants. 1685 34