共查询到19条相似文献,搜索用时 61 毫秒
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研究了高分子支撑液膜固定化细胞的制备、性质以及影响其催化氢化可的松→去氢氢化可的松生物转化的各种因素,并与经典珠状包埋法固定细胞的转化作用进行了比较。结果表明前者的△1-脱氢速率和产物转化率均高于后者。在所使用的条件下二者未见机械强度方面明显差别。 相似文献
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生长调节剂对甾体微生物催化转化过程的影响 总被引:3,自引:0,他引:3
利用微生物菌种(如绿僵菌Metarhiziumsp)产生的11α-羟化酶,催化甾体底物16α,17α-环氧黄体酮(16α,17α-epoxy-4-pregnene-3,20-dione)羟化转化为产物11α-羟基-16α,17α-环氧黄体酮,是当前甾... 相似文献
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(一)2-烷基-2-(3'-乙二醇缩酮丁基)-1,3-环戊二酮的不对称还原 甾体不对称全合成中一个重要中间体2可以由三酮化合物1经微生物不对称还原而得。为避免1在还原时所得的桥环副产物8,我们先将三酮1用乙二醇选择性地保护侧链羰基成3,然后将3用啤酒酵母还原,得到了光学活性化合物4而未分离到8。 相似文献
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醋酸纤维素膜固定化脲酶的研究 总被引:9,自引:0,他引:9
酶固定膜反应器兼具有反应和分离两种功能,是酶工程领域中较活跃的研究课题.随着酶固定化技术和水平的提高,各种固定化酶生物反应器不断涌现,其中以采用固定化脲酶技术制作的人工肾最为成功. 相似文献
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The present paper describes the preparation and properties of the encapsulated Arthrobacter simplex cells by liquid surfactant membrane which catalyzes the transformation of biger steroid molecule,i.e.,cortisol into prednisolone.The experimental results indicated that the catalytic transformation took place very well and in some systems the encapsulated cells kept the initial rate of catalytic transformation as good as that of the free cells.The stability of storage is raised by encapsulation.We also investigated various factors which affect the biocatalytic transformation from which we know that the encapsulated cell system is not influenced by the contamination of Bacillus cells which inhibit the free cell system seriously. 相似文献
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This paper describes,the preparation and properties of polymer-supported liquid membrane immobilized cells of Arthrobacter simplex which catalyze the transformation of cortisol into predni-solone.The transforming activity of cells immobilized by this method was compared with that of cells immobilized by traditional entrapment method.The result showed that the transforming activity of the former was obviously higher than that of the latter,and there was no apparent difference of mechanical strength between che former and the latter under our working conditions.The various factors affecting the transformation were studied as well. 相似文献
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消除夹带溶胀的新液膜操作法曹汉瑾,褚莹,何彦涛,吴子生,严忠(东北师范大学化学系长春130024)关键词液膜,油/水乳液,溶胀,夹带,包裹消除液膜操作中的夹带溶胀对液膜的工业化具有重要意义,夹带溶胀分为包裹溶胀和再液化溶胀。前者是乳状液滴上浮时将水相... 相似文献
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YANGYong MAOLu-yuan LILiu-zhu LIUXiao-guang SHIJun CAOShao-kui 《高等学校化学研究》2004,20(2):240-243
Hemeproteins encapsulated in reversed micelle formulated with di-2-ethylhexyl sulfosuccinate (AOT)was found to catalyze the polymerization of o-phenylenediamine (o-PDA) with hydrogen peroxide, whereas o-PDA catalyzed by hemeproteins dissolved in water could only form its trimers. As the nanostructural environment in reversed micelle acts as a certain orientation surrounding medium, it offers a strong electrostatic field that alters the reductive potential of Fe^3 /Fe^2 (Em7) in the heme of hemeproteins and thus increases the catalytic activity of peroxidase accordingly. According to the results of UV-Vis, ^1H NMR and FTIR, the polymer catalyzed by hemoglobin(Hb) in reversed micelle was presumed to be constructed of lines and trapeziforms alternatively. 相似文献
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我们利用离子自组装的方法以含苯甲酸基团的两亲分子A6包覆了含铕的无机多金属氧簇Na9[EuW10O36]。利用红外光谱、热重分析、元素分析等方法对所得有机无机杂化复合物A6Eu进行了详细的结构表征。苯甲酸基团通过分子间氢键相互作用发生的二聚使有机组分形成了枝杈状的Bola型结构,这种结构导致外围的介晶基元以侧向方式连接在无机簇上。我们通过差示扫描量热法、偏光显微镜和变温X射线衍射对A6Eu的热致液晶性质进行了表征。虽然单独的两亲分子A6组装成了简单的近晶结构,但是复合物A6Eu表现出新颖的层状近晶相液晶结构。层状近晶相液晶结构中介晶基元是平行于层面的。由此可见,介晶基元的侧向连接方式对复合物的热致组装结构具有重要影响。多金属氧簇的荧光性质在液晶材料中得到了很好的保持。 相似文献