Pectin substances from sea and freshwater grasses as stabilizers at manufacturing of canned food of type confiture

Works on research of physical and chemical properties of polysaccharides taken from a sea grass zostera nana and fresh-water grass potamogeton perfoliatus, growing in reservoirs of the Volga river delta and in the territories of the Northern Caspian Sea: zosterat and rdestat ammonium. Their similarity to the traditional pectin from land plants (apple pectin) is shown. The aim of the research was to investigate the possibility of using pectin of higher aquatic plants of the Volga-Caspian basin as a stabilizer in the production of canned food like jam. The technology of jams from lemon has been approved and samples of canned food like jam with addition of zosterat ammonium, rdestat ammonium and apple pectin as stabilizers have been obtained. To determine the organoleptic, physical-chemical and microbiological indices of the quality of the studied objects the methods of State Standard 8756.1, State Standard 26313–84, State Standard 26669 have been used. The laboratory experiments showed that by organoleptic and physical and chemical indicators jams with addition of zosterat and rdestat ammonium completely correspond to the indicators of the quality required for the premium jams of State Standard, extended to the jam made of mashed fruits and berries with addition or without addition of pectin. The chemical composition of lemon marmalade is represented mainly by simple carbohydrates (42 %) and hydrolyzable polysaccharides (7.44–7.99 %) and proteins content of which is almost the same in all three kinds of the studied jams – 9.63 %. Acidity of the made marmalade was 2.3–2.4 %, which meets the requirements of the above standard. Besides, microbiological indicators of the quality of the studied objects which met the requirements of industrial sterility for the fruit and fruit-berry pasteurized canned products have been defined.