FEATURES OF THE TECHNOLOGY OF LIPOSOMAL FORMULATION OF A ANALOGUE HYPOTHALAMIC HORMONE SOMATOSTATIN

Background. In connection with the prospect of the use of an analog of the hypothalamic hormone somatostatin synthesized by the laboratory of chemical synthesis Institute of experimental diagnostics and chemotherapy of FSBI «N.N. Blokhin Russian Cancer Research Center» and showed a high anti-tumor activity as a drug arises a need to establish an optimal technology of its receipt. In preliminary studies in a modelformulation for an analog of the hypothalamic hormone somatostatin selected liposome technological process of which has a series of specific steps comprising. Objective. Development of technology for obtaining liposomal formulation hypothalamic hormone somatostatin analogue. Materials and methods. Liposomes analog of the hypothalamic hormone somatostatin obtained by method Bengema in modification for hydrophobic substances. To reduce the diameter of the liposome are used methods extrusion, homogenization and ultrasonic. Analysis of the size of the liposomes was performed by correlation spectroscopy light scattering using nanosizer. The pH of the liposomal dispersion was determined by potentiometry. The quantitative content of the drug substance was determined by spectrophotometry using a standard sample with X (282 ± 3) nm and an alcoholic solution of empty liposomes as a reference solution. Amount of incorporated drug was calculated as the ratio of the concentration of drug in the liposome dispersion after filtration to the concentration of drug in the dispersion after preparation. Results and Conclusion. The hydrophobic nature of the substance causes an analog of the hypothalamic hormone somatostatin technological features of obtaining liposomal formulation. Since the step of forming a film of the lipid substance is dissolved in an organic solvent together with lipids, film is hydrated by a solution of cryoprotectant. Grinding liposomes an analog of the hypothalamic hormone somatostatin appropriate to be carried out using homogenization or extrusion methods, due to the high efficiency of these methods, the preservation stability of the liposomes and a high percentage of inclusion an analog of the hypothalamic hormone somatostatin, included in the liposomal bilayer. At the stage of separating the non-inclusion of substance an analog of the hypothalamic hormone somatostatin due to the insolubility of the substance in the water, you can use the filtering method, without the need for complicated procedures gel filtration, dialysis, etc. Furthermore the process of separating a substance not included can be combined with the sterilization of the liposome dispersion by selecting a particular filter material.