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    Öğe
    Paramagnetic contribution of serum iron to the spin-spin relaxation rate (1/T2) measured by MRI
    (Springer Wien, 2002) Yilmaz, A; Yurdakoc, M; Bernarding, J; Vieth, HM; Braun, J; Yurt, A
    Spin-spin relaxation time T-2 values of serum with and without iron were measured by magnetic resonance imaging (MRI) to find the proton relaxivity of Fe(III) in serum. T-2 values in serum containing definite amounts of added iron were also measured before and after addition of ascorbic acid. The difference in the 1/T-2 of serum with and without ascorbic acid was used for recalculation of the added iron values, Recalculated iron values confirm that the difference in healthy serum is caused by iron only. In addition, in order to find the paramagnetic contribution of serum iron, T-2 values of iron-deficient, healthy and iron-overloaded serum were measured before and after addition of ascorbic acid. The difference in the 1/T-2 values was then applied to the calculation of the serum iron values. The consistency of iron values determined from the difference to those by autoanalyzer suggests that the differences in diseased serum also represent the paramagnetic contribution of serum iron. The data imply that serum iron content in healthy, iron-deficient and iron-overloaded serum may be assessed by MRI.
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    Öğe
    Solvent extraction of La3+ with ethylenediamine-N,N?-ditetradecyl-N,N?-diacetic acid (EDDAT) in dichloromethane
    (Scientific Technical Research Council Turkey, 1998) Yurdakoc, M; Hosgoren, H
    Ethylenediamine-N,N'-ditetradecyl-N,N'-diacetic acid (EDDAT) was synthesized for the solvent extraction of La3+. EDDAT was prepared from ethylenediamine-N,N'-diacetic acid (EDDA) and tetradecyl bromide in a basic n-amylalcohol-ethanol-water solvent system. The structure of this new extracting reagent was identified according to spectroscopic data, i.e. C-13 NMR, H-1 NMR, and elemental analysis results. The solvent extraction of La3+ with EDDAT in dichloromethane was studied as a function of parameters of the aqueous and organic phases. The optimal extraction conditions were determined. The extraction yield increased with a decrease in hydrogen ions in the aqueous phase. Stripping of the La3+ loaded organic phase was achieved with HCl aqueous solution. The effect of stripping as a function of the HCl concentration was also studied.