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In this work hydroxyapatite (HAP) nanoparticles ranging in size from 30 to 150 nm of lamellar and rod-shaped form were obtained by controlled deposition in the presence of a stabilizer. HAP nanoparticle powder in different mass ratios was added to a mixture of biocompatible polymers (sodium alginate and PLGA), which were the dispersion medium of the emulsion. Water or an aqueous solution of sodium citrate was used as the dispersed phase. The internal structure of the matrices was studied by scanning electron micro...