Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2015Scopus SJRQ4/r/bayburt/12473
  Synthesis, characterization and complexation properties of a novel Mg-porphyrazine with metal ions in acetonitrile-chloroform

  Kabay, Nilgün; Baygu, Yasemin; Gök, Yaşar; Başoʇlu, Aysel; Ocak, Ümmühan

  The synthesis and characterization of a novel metal derivative of a peripherally symmetrically tetra-substituted porphyrazine derived from 25,26-dioxa-6,7,9,10,15,16,18,19-octahydro-25H-1,24-methanodibenzo[q,t][1,4,13,16,17,10]tetraoxadithiacyclohenicosine-12,13-dicarbonitrile was carried out. The influence of metal cations such as Zn2+, Fe2+, Mn2+, Ni2+, Co2+, Hg2+ and Cu2+ on the spectroscopic properties of the ligands, the starting material dinitrile and MgPz were investigated in acetonitrile-chloroform solution (1/1) by means of absorption spectrometry. Absorption spectra showed isosbestic points in the spectrophotometric titration of Cu2+ and Hg2+ with MgPz ligand. The results of spectrophotometric titration experiments disclosed the complex stability constant of the novel ligand, MgPz with Cu2+ and Hg2+ cations.

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• MakaleYalnız künye2015Scopus SJRQ1/r/bayburt/12430
  Simple time-saving method for iron determination based on fluorescence quenching of an azaflavanon-3-ol compound

  Başoʇlu, Aysel; Tosun, Gonca; Ocak, Miraç; Alp, Hakan; Yayli, Nurettin; Ocak, Ümmühan

  A simple and time-saving spectrofluorometric method developed using an azaflavanon-3-ol compound was used for the determination of iron in various food samples. Nitric acid and hydrogen peroxide were used for digestion of samples in a closed microwave system. The method was validated by analyzing two certified reference materials (CRM-SA-C Sandy Soil C and Mixed Polish Herbs INCT-MPH-2). Measurements were carried out using a modified standard addition method. The standard addition graph was linear until 21.6 mg/L in the determination of iron(III). Detection and quantification limits were 0.81 and 2.4 mg/L, respectively. Satisfactory accuracy was obtained for spinach, dill, mint, purslane, rocket, red lentils, dry beans, and two iron medicinal tablets. High recoveries were found for streamwater samples fortified at three different concentrations. The method is simple, time-saving, cost-effective, and suitable for the determination of the iron content of foods.

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  AtıfScopus22·WoS19·OpenAlex21

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