Abstract

BENAVIDES AREVALO, Julie Fernanda  and  TOBON ZAPATA, Gloria Elena. Synthesis, physiochemical and solid state characterization of copper, magnesium, manganese and zinc asparaginates. Rev Cubana Farm [online]. 2013, vol.47, n.2, pp. 157-166. ISSN 0034-7515.

Introduction: the mineral deficiency in the human population has been associated with metabolic, hormonal and immunological disorders. These minerals are generally supplemented with inorganic salts in the body, but they might cause gastric distress and low absorption problems depending on the type of salt used. Previous studies demonstrated adequate absorption and absence of gastric effects when minerals were associated with organic ligands such as enzymes, proteins and particularly amino acids. Objective: to determine the viability of copper, magnesium, manganese and zinc asparaginates as nutritional supplements in a preformulation study. Methods: the synthesis and verification of the formation of complexes were carried out by Fourier transformed infrared spectroscopy and X-ray diffraction of powders. The solubility, the dissociation constant, the dissolution efficiency and the physical solid state properties (morphology, particle distribution and size, Haussner´s index, porosity and compressibility) of these complexes were evaluated. The compatibility of the complex with excipients was determined. Results: the involvement of the asparagine carboxyl group in the formation of the coordination bond of the complex was observed in the infrared spectra. the absence of starting materials and the crystallinity in the complexes were evidenced in the X-ray diffraction of powders. The solubility, the dissociation constant and the dissolution efficiency of the complexes established their amphoteric character. Conclusions: the results achieved in the physical solid state properties, the level of moisture and the compatibility with the formulation excipients indicate that copper, magnesium, manganese and zinc asparaginates have suitable rheological properties for pharmaceutical purposes.

Keywords : minerals; amino acids; complex; solubility; dissolution efficiency; porosity; compressibility and compatibility.

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