. . . . . "I, S, V" . . . "[B1F97E13C34A]" . "\u0160arek, Jan" . "301038" . "1"^^ . "3"^^ . . "353552" . "\u00DA\u0159ad pr\u016Fmyslov\u00E9ho vlastnictv\u00ED; http://www.upv.cz" . . "Zp\u016Fsob p\u0159\u00EDpravy betulin-diacet\u00E1tu z b\u0159ezov\u00E9 k\u016Fry z pap\u00EDren" . "Zp\u016Fsob p\u0159\u00EDpravy betulin-diacet\u00E1tu z b\u0159ezov\u00E9 k\u016Fry z pap\u00EDren" . . "The invention relates to a method of preparation and isolation of betulin diacetate from birch bark from paper mills and its optional processing to betulin, wherein the birch bark is ground, mixed with two- to twenty-fold excess volume of water and is stirred so that all birch bark is dipped, then the fraction of the birch bark which floats on the surface is collected, said collected fraction is dried at the temperature in the range of from 50 to 85 DEG C. and betulin contained is then subjected to an acetylation reaction, after the acetylation the birch bark is dried at the temperature of from 50 to 100 DEG C. and the formed betulin diacetate is then isolated from the birch bark by SE of the birch bark with carbon dioxide at 28-35 MPa and the temperature of from 50 to 100 DEG C. and subsequently, the supercritical extract is recrystallized for direct use or for further processing. The further processing can be basic hydrolysis of the re-crystallized betulin diacetate to betulin."@en . "2009-09-09+02:00"^^ . "METHOD OF PREPARATION AND ISOLATION OF BETULIN DIACETATE FROM BIRCH BARK FROM PAPER MILLS AND ITS OPTIONAL PROCESSING TO BETULIN"@en . "Praha" . . "11310" . . "Univerzita Karlova v Praze, P\u0159\u00EDrodov\u011Bdeck\u00E1 fakulta, Praha, CZ; I.Q.A., a. s., Praha, CZ; Univerzita Palack\u00E9ho v Olomouci, Olomouc, CZ" . . . . "BETULIN; PROCESSING; OPTIONAL; ITS; AND; MILLS; PAPER; FROM; BARK; BIRCH; FROM; DIACETATE; BETULIN; ISOLATION; AND; PREPARATION; METHOD"@en . . "RIV/00216208:11310/09:10000490" . . "Hajd\u00FAch, Mari\u00E1n" . "Zp\u016Fsob p\u0159\u00EDpravy betulin-diacet\u00E1tu z b\u0159ezov\u00E9 k\u016Fry z pap\u00EDren"@cs . "Svoboda, Michal" . . "\u0158e\u0161en\u00ED se t\u00FDk\u00E1 zp\u016Fsobu p\u0159\u00EDpravy betulin-diacet\u00E1tu z b\u0159ezov\u00E9 k\u016Fry z pap\u00EDren, p\u0159i n\u011Bm\u017E se b\u0159ezov\u00E1 k\u016Fra namele, pot\u00E9 se sm\u00EDch\u00E1 s dvou- a\u017E dvacetin\u00E1sobn\u00FDm objemem vody a zam\u00EDch\u00E1 se tak, aby ve\u0161ker\u00E1 b\u0159ezov\u00E1 k\u016Fra byla smo\u010Dena, potom se sesb\u00EDr\u00E1 pod\u00EDl b\u0159ezov\u00E9 k\u016Fry, kter\u00FD plave na hladin\u011B, sesb\u00EDran\u00FD pod\u00EDl b\u0159ezov\u00E9 k\u016Fry se vysu\u0161\u00ED p\u0159i teplot\u011B v rozmez\u00ED 50 a\u017E 85 \u00B0C a pot\u00E9 se betulin obsa\u017Een\u00FD ve vysu\u0161en\u00E9 b\u0159ezov\u00E9 k\u016F\u0159e podrob\u00ED acetylaci, po acetylaci se b\u0159ezov\u00E1 k\u016Fra vysu\u0161\u00ED p\u0159i teplot\u011B v rozmez\u00ED 50 a\u017E 100 \u00B0C a vznikl\u00FD betulin-diacet\u00E1t se pot\u00E9 izoluje z b\u0159ezov\u00E9 k\u016Fry superkritickou extrakc\u00ED b\u0159ezov\u00E9 k\u016Fry oxidem uhli\u010Dit\u00FDm za tlaku 28 a\u017E 35 MPa a teploty 50 a\u017E 100 \u00B0C a n\u00E1sledn\u011B se superkritick\u00FD extrakt p\u0159ekrystalizuje pro p\u0159\u00EDm\u00E9 pou\u017Eit\u00ED nebo dal\u0161\u00ED zpracov\u00E1n\u00ED. Dal\u0161\u00EDm zpracov\u00E1n\u00EDm m\u016F\u017Ee b\u00FDt bazick\u00E1 hydrol\u00FDza p\u0159ekrystalovan\u00E9ho betulin-diacet\u00E1tu na betulin." . . . . "METHOD OF PREPARATION AND ISOLATION OF BETULIN DIACETATE FROM BIRCH BARK FROM PAPER MILLS AND ITS OPTIONAL PROCESSING TO BETULIN"@en . . . . "\u0158e\u0161en\u00ED se t\u00FDk\u00E1 zp\u016Fsobu p\u0159\u00EDpravy betulin-diacet\u00E1tu z b\u0159ezov\u00E9 k\u016Fry z pap\u00EDren, p\u0159i n\u011Bm\u017E se b\u0159ezov\u00E1 k\u016Fra namele, pot\u00E9 se sm\u00EDch\u00E1 s dvou- a\u017E dvacetin\u00E1sobn\u00FDm objemem vody a zam\u00EDch\u00E1 se tak, aby ve\u0161ker\u00E1 b\u0159ezov\u00E1 k\u016Fra byla smo\u010Dena, potom se sesb\u00EDr\u00E1 pod\u00EDl b\u0159ezov\u00E9 k\u016Fry, kter\u00FD plave na hladin\u011B, sesb\u00EDran\u00FD pod\u00EDl b\u0159ezov\u00E9 k\u016Fry se vysu\u0161\u00ED p\u0159i teplot\u011B v rozmez\u00ED 50 a\u017E 85 \u00B0C a pot\u00E9 se betulin obsa\u017Een\u00FD ve vysu\u0161en\u00E9 b\u0159ezov\u00E9 k\u016F\u0159e podrob\u00ED acetylaci, po acetylaci se b\u0159ezov\u00E1 k\u016Fra vysu\u0161\u00ED p\u0159i teplot\u011B v rozmez\u00ED 50 a\u017E 100 \u00B0C a vznikl\u00FD betulin-diacet\u00E1t se pot\u00E9 izoluje z b\u0159ezov\u00E9 k\u016Fry superkritickou extrakc\u00ED b\u0159ezov\u00E9 k\u016Fry oxidem uhli\u010Dit\u00FDm za tlaku 28 a\u017E 35 MPa a teploty 50 a\u017E 100 \u00B0C a n\u00E1sledn\u011B se superkritick\u00FD extrakt p\u0159ekrystalizuje pro p\u0159\u00EDm\u00E9 pou\u017Eit\u00ED nebo dal\u0161\u00ED zpracov\u00E1n\u00ED. Dal\u0161\u00EDm zpracov\u00E1n\u00EDm m\u016F\u017Ee b\u00FDt bazick\u00E1 hydrol\u00FDza p\u0159ekrystalovan\u00E9ho betulin-diacet\u00E1tu na betulin."@cs . . "RIV/00216208:11310/09:10000490!RIV11-MSM-11310___" . . . . . "Zp\u016Fsob p\u0159\u00EDpravy betulin-diacet\u00E1tu z b\u0159ezov\u00E9 k\u016Fry z pap\u00EDren"@cs . . . . .