"2003-04-01+02:00"^^ . "GA203/99/1457" . . . "Nov\u00FD zp\u016Fsob p\u0159\u00EDpravy gama- a alfa-linolenov\u00FDch mastn\u00FDch kyselin ze semen Ribes nigrum: Enzymov\u00E1 katal\u00FDza v superkritick\u00E9m oxidu uhli\u010Dit\u00E9m" . . "12"^^ . . . "12"^^ . "Neuvedeno."@en . . . "Isomern\u00ED gama-linolenov\u00E1 (GLA) a alfa-linolenov\u00E1 (ALA) kyseliny jsou prekursory eikosanoid\u016F a \u017Eivotn\u011B d\u016Fle\u017Eit\u00FDch slo\u017Eek sav\u010D\u00EDch bun\u011Bk, kter\u00E9 tvo\u0159\u00ED d\u016Fle\u017Eit\u00FD zdroj energie a kter\u00E9 maj\u00ED d\u016Fle\u017Eitou \u00FAlohu ve struktu\u0159e membr\u00E1n a jejich funkci. P\u0159edstavuj\u00ED 2 skupiny (n-6 a N-3) polynenasycen\u00FDch mastn\u00FDch kyselin a maj\u00ED r\u016Fzn\u00FD nutri\u010Dn\u00ED a metabolick\u00FD v\u00FDznam v lidsk\u00E9m t\u011Ble. Projekt se zam\u011B\u0159uje na p\u0159\u00EDpravu ester\u016F GLA a ALA ze semen \u010Dern\u00E9ho ryb\u00EDzu, kter\u00FD se vyzna\u010Duje ojedin\u011Ble bohat\u00FDm obsahem obou kyselin (p\u0159esahuj\u00EDc\u00EDm 10 % ka\u017Ed\u00E9 z nich) ve form\u011B jejich triglycerid\u016F. P\u0159edpokl\u00E1d\u00E1me potvrzen\u00ED hypot\u00E9zy, \u017Ee \u010Dist\u00E9 estery GLA a ALA mohou b\u00FDt p\u0159ipraveny enzymovou hydrol\u00FDzou \u010Di transesterifikac\u00ED katalyzovanou pomoc\u00ED lipas v superkritick\u00E9m oxidu uhli\u010Dit\u00E9m. D\u00E1le p\u0159edpokl\u00E1d\u00E1me, \u017Ee kombinac\u00ED zn\u00E1m\u00FDch v\u00FDhod enzymov\u00E9 katal\u00FDzy s v\u00FDhodami, kter\u00E9 p\u0159in\u00E1\u0161\u00ED pr\u00E1ce v superkritick\u00E9m mediu, je mo\u017Eno (i) v\u00FDznamn\u011B omezit tvorbu vedlej\u0161\u00EDch produkt\u016F p\u0159i enzymov\u00E9 hydrol\u00FDze a transesterifikaci a (ii) zjednodu\u0161it separaci produkt\u016F po" . . "A new route to gamma- and alpha-linolenic fatty acids from Ribes nigrum seeds: enzymatic catalysis in supercritical carbon dioxide"@en . . "1"^^ . "C\u00EDl projektu - studium nov\u00FDch zp\u016Fsob\u016F p\u0159\u00EDpravy gama- a alfa linolenov\u00FDch kyselin ze semen ryb\u00EDzu \u010Dern\u00E9ho - byl v\u00EDce ne\u017E uspokojiv\u011B spln\u011Bn. \u0158e\u0161itel\u00E9 vyu\u017Eili enzymovou katal\u00FDzu lipasami z r\u016Fzn\u00FDch zdroj\u016F p\u0159i alkohol\u00FDze oleje ze semen a prostudovali podm\u00EDnky"@cs . . . . "2"^^ . "The isomeric gama-linolenic (GLA) and alfa-linolenic (ALA) acids are the precursors of eicosanoids and vital components of mammalian cells, providing an important store of energy and playing a leading role in the membrane structures and functions. They represent two different families (n-6 vs. n-3) of polyunsaturated fatty acids, and display different nutritional and metabolic significance in the human body. The project focuses on a production of GLA and ALA esters from blackcurrant seeds that are knowto contain uniquely both acids as triglycerides in amounts extending 10% of each acid. A hypothesis that purified esters cans be prepared via lipase catalyzed hydrolysis / transesterification reactions in supercritical carbon dioxide will be verified. Itis supposed that combining the known advantages of enzymic catalysis with those of employind supercritical medium could (i) reduce substantially an expected formation of side products in the hydrolysis / transesterification reactions catalyzed by a lipas"@en . . . . "0"^^ . "http://www.isvav.cz/projectDetail.do?rowId=GA203/99/1457"^^ . . .