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The problem of obtaining compositions, that would act as biomaterials and fit all demands, is well-known. One the branch of application materials such is the hydrogels. High retention capacity of water and physiological fluids, sufficient physio-mechanical properties and safety of usage are ones of the most relevant specifications for medical hydrogels. It is quite hard to develop such formulations. Perspective initial substances for synthesis are gelatin (peptide native to human collagen) and tannin (natural comp...