Y. Аllам, N. V. Dolgаnova OPTIMUM CONDITIONS FOR PRODUCING CHITOSAN FROM SHELL OF GREEN SHRIMP PENAEUS SEMISULCATUS Abstract. <...> The paper studies the conditions for obtaining chitosan from the shells (wastes from cutting the shell) of green shrimp Penaeus semisulcatus, caught in Egypt. <...> Demineralization of raw materials was carried out using 1 M HCl at 45°C for 2 hours, and deproteinization was made with the use of 1 M HCl at 75°C for 4 hours. <...> As a technology of obtaining chitosan there was used deacetylation of chitin (50 g dried shrimp shells), produced in accordance with the previously developed technology using NaOH treatment solution of different concentrations (2.5, 5, 7.5, 10 and 12.5 mol) and by heating (30, 45, 60, 75 and 90°C), which dramatically reduced the time of deacetylation. <...> The dependence of the properties of the chitosan on the concentration of NaOH, temperature and duration of the experiment was examined. <...> The optimal mode of chitosan obtaining – treatment with a solution NaOH with concentration of 10 M at 90°C for 2 hours was set. <...> Followed by extraction of protein matter in alkaline medium (deproteinization), and it is traditionally done by treating shells wastes with aqueous solutions of NaOH or KOH. <...> The effectiveness of alkali deproteinization depends on the process temperature, the alkali concentration, and the ratio of its solution to the shells [4–6]. <...> The chemical compositions, functional properties of shrimp shell chitosan were studied. <...> D.34212 Melsungen, Germany) to pass through a 1.6 mm sieves and stored at 4ºC in tight dark glasses till they were subjected to demineralization and deproteinization process. <...> A preliminary experiment to define the optimum demineralization condition of shrimp shells was carried out using 50 g dried shrimp shells. <...> A preliminary experiment to define the optimum conditions for deproteinization of demineralized shrimp shells and deproteinized was carried out using 50 g demineralized dried shrimp shells. <...> Preliminary experiments were carried out by refluxing chitin in strong NaOH solution at normal atmosphere. <...> A preliminary experiment to define the optimum deacetylation condition of shrimp shell chitin was carried out using 50 g dried shrimp shell chitin (demineralized and deproteinized). <...> Сер <...>