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اطلاعات انتشار: Iranian Journal of Chemistry and Chemical Engineering (IJCCE)، بيست و نهم،شماره۴(پياپي ۵۶)، ۲۰۱۰، سال ۰
تعداد صفحات: ۱۰
Adsorption of Bovine Serum Albumin (BSA) onto calcium Hydroxyl Apatite (HA), Ca10PO4(OH)2, has been studied by Ultra Violet (UV) spectroscopy. The adsorption isotherms of BSA onto the HA surface at 291.7 K and 303.2 K were satisfactorily presented by Langmuir equation and the evaluated parameters are reported. The specific surface area of HA has been measured by the BET method. The obtained value for the used HA sample was 63 m2\g. The effect of pH on BSA adsorption onto the HA in presence of salts KCl and NaF and phosphate ion has been investigated. In the fixed concentration of BSA (1 mg\mL) it is shown that the pH decreasing causes to increase of the adsorption of BSA onto HA. Considering the role of effective factors in BSA adsorption onto HA such as the size and charge of the BSA and the surface energy of HA showed that the electrostatic repulsion forces between HA and BSA cause a decrease in BSA adsorption onto HA. Also the obtained results indicated that the surface energy of HA predominates the effect of size and charge of BSA.
نویسنده(ها): Aghabozorg، Hossein، Firoozi، Najmeh، Roshan، Leila، Mirzaei، Masoud، Shokrollahi، Ardeshir، Aghaei، Roghayyeh، Aghlmandi، Ziba
اطلاعات انتشار: Iranian Journal of Chemistry and Chemical Engineering (IJCCE)، سي ام،شماره۴(پياپي ۶۰)، ۲۰۱۱، سال ۰
تعداد صفحات: ۱۲
In the crystal structure of the title polymeric compound, [C42H38N6O33Sr5.2(H2O)]n, five independent metal atoms (Sr1–Sr5) have different coordination environments. The S 1 and Sr5 atoms are nine coordinated and feature distorted tricapped trigonal–prismatic and capped square–antiprismatic geometries, respectively. The rest SrII atoms have eight coordination numbers. These units are connected via the carboxylate O atoms of mono– and di anionic forms of pyridine– 2,6–dicarboxylic acid, (pydcH2), and bridging water molecules that resulted in the formation of polymeric layers in 3–D. In the crystal structure, non–covalent interactions consisting of hydrogen bonds (O—H···O and C—H···O), – [interplanar distances of 3.413(2); 3.601(2) Å] and CO··· [O··· distances of 3.249(3); 3.275(3) Å] stacking interactions play an important roles in stabilizing the structure. The protonation constants of propane–1, 2–diamine (1, 2–pn) and pyridine–2,6–dicarboxylate ion (pydc)2–, the equilibrium constants for the pydc–1,2–pn proton transfer system and the stoichiometry and stability of this system with Sr2+ ion in aqueous solution were investigated by potentiometric pH titrations. The stoichiometry of one of the most abundant complexed species in solution was found to be the same as that of the crystalline SrII complex.
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