Kukhtenkova Elizaveta A. RussiaРязаньRyazan State Medical University academician I. P. Pavlov, 9, Visokovoltnaya St., Ryazan, 390026, Russiakuhta1199@gmail.com Author's articles Polysaccharidebased Biological Activity of Extracts Isolated from Fruits of Crataegus Monogyna of Varying Degrees of Maturity