申请人:Ceskoslovenska akademie ved
公开号:US04097470A1
公开(公告)日:1978-06-27
Polymeric form of a biologically active compound containing at least one -NH.sub.2 group in its molecule, adapted for the protracted release of said biologically active compound by enzymatic cleavage of the polymer in vivo in the organism. The active compound is bonded by its -NH.sub.2 group to the carboxylic group of an L-amino acid as for instance, .beta.-phenylalanine, tyrosine, tryptophane, lysine, arginine, glycine, alanine, leucine, citruline or ornithine, which latter is in twin bonded by its amino group to the terminal carboxylic group of the side chain of a substituted amide or ester of acrylic or methacrylic acid, said side chain constituting a linear moiety containing at least 3 carbon atoms. The latter compound or monomer is copolymerized with a hydrophilic monomer such as, N-alkylmethacrylamide, N-alkylacrylamide, N,N-dialkylacrylamide, wherein alkyl has 1-6 carbon atoms and may contain 1 to 3 OH groups, or glycol acrylate or methacrylate alone or in admixture, and which copolymer may contain further monomeric components, for example, cross-linking agents. It is the copolymer which constitutes the subject matter of the invention, i.e., the biologically active substance bearing -NH.sub.2 groups in a form releasable by enzymatic cleavage. The copolymer can also be prepared using as the monomer a compound containing the bonded L-amino acid and in which the terminal carboxylic group has been converted to the reactive ester. The active compound is then bonded to the thusly prepared reactive polymer. The enzymatic release of the active compound bearing -NH.sub.2 groups can be controlled, i.e., regulated by the size of the side chain carrying the L-amino acid.
一种
生物活性化合物的聚合物形式,其分子中至少含有一个-NH.sub.2基团,适用于通过体内的酶解聚合物来延长释放所述
生物活性化合物。活性化合物通过其-NH.sub.2基团与L-
氨基酸(例如β-苯丙
氨酸、
酪氨酸、色
氨酸、赖
氨酸、精
氨酸、甘
氨酸、丙
氨酸、亮
氨酸、瓜
氨酸或
鸟氨酸)的羧基团键合,后者通过其
氨基团与
丙烯酰或甲基
丙烯酰酸的取代酰胺或酯的侧链的末端羧基团相双键合,所述侧链构成至少含有3个碳原子的线性基团。该化合物或单体与亲
水性单体(例如N-烷基甲基
丙烯酰胺、N-烷基
丙烯酰胺、N,N-二烷基
丙烯酰胺,其中烷基具有1-6个碳原子,可能含有1到3个OH基团,或者仅含有或与混合物中的
甘醇丙烯酸酯或
甲基丙烯酸酯一起)共聚合而成,该共聚物可以包含进一步的单体组分,例如
交联剂。共聚物构成了本发明的主题,即以酶解可释放含有-NH.sub.2基团的
生物活性物质的形式。共聚物也可以使用含有键合L-
氨基酸的单体来制备,其中末端羧基团已转化为反应性酯。然后将活性化合物键合到这样制备的反应性聚合物上。带有-NH.sub.2基团的活性化合物的酶解释放可以通过携带L-
氨基酸的侧链的大小来控制或调节。