Transglycosylation reactions employing .beta.-galactosidase
    8.
    发明授权
    Transglycosylation reactions employing .beta.-galactosidase 失效
    使用β-半乳糖苷酶的转糖基化反应

    公开(公告)号:US5876981A

    公开(公告)日:1999-03-02

    申请号:US733232

    申请日:1996-10-17

    CPC classification number: C12P19/26 C12P19/14

    Abstract: .beta.-Galactosides are synthesized using a transglycosylation reaction catalyzed by .beta.-galactosidase. The reaction employs a carbohydrate donor having a glycosidic leaving group attached to its anomeric carbon and an oxo group attached to the C-6 carbon. Strong leaving groups are preferred over weak leaving groups. The method can be carried out in aqueous solution without organic solvents to give the transglycosylation product in high yields and high regioselectivity. The synthesis of lactosamine using this methodology with galactose oxidase (GO) and .beta.-galactosidase has been accomplished. (FIG. 3). The methodology affords simple reaction conditions and minimal purification steps. In addition, the intermediate substrates maintain high stability, the process affords high yields and the enzymes and reagents employed are commercially available with high stability and low costs.

    Abstract translation: β-半乳糖苷是使用由β-半乳糖苷酶催化的转糖基化反应合成的。 该反应采用具有与其端基异构碳连接的糖苷离去基团和与C-6碳连接的氧代基团的碳水化合物供体。 强离去基团优于弱离去基团。 该方法可以在没有有机溶剂的水溶液中进行,以高收率和高区域选择性得到转糖基化产物。 已经完成了使用该方法与半乳糖氧化酶(GO)和β-半乳糖苷酶合成乳糖胺。 (图3)。 该方法提供简单的反应条件和最小的纯化步骤。 此外,中间基材保持高稳定性,该方法提供高产率,所用的酶和试剂可以高稳定性和低成本商购。

    Coupler
    9.
    发明授权
    Coupler 失效
    耦合器

    公开(公告)号:US4408372A

    公开(公告)日:1983-10-11

    申请号:US198726

    申请日:1980-10-20

    CPC classification number: F16B21/073 Y10T24/45775

    Abstract: A coupler for joining two objects comprises an insertion member attached fast to one of the objects and a reception member attached fast to the other object and used for admitting the insertion member into fast engagement therewith. The insertion member is provided with a setting portion for fast attachment to the aforementioned one object and a shaft extended from the setting portion and possessed of a radially expanded engaging portion at the leading end thereof. The reception member is provided with two generally semicylindrical shells connected to each other through a thin-walled hinge portion and adapted to form one cylindrical shape upon being closed onto each other along the matched edges thereof and a plurality of resilient engaging pieces regularly spaced in the longitudinal direction on the inner wall of each of the shells.

    Abstract translation: 用于连接两个物体的联接器包括快速附接到物体之一的插入构件和快速附接到另一物体的接收构件,并用于允许插入构件与其快速接合。 插入构件设置有用于快速附接到上述一个物体的设置部分和从设置部分延伸并且在其前端具有径向扩张的接合部分的轴。 接收构件设置有两个通常半圆柱形壳体,通过薄壁铰链部分相互连接,并且适于在沿其匹配边缘彼此闭合时形成一个圆柱形形状,并且多个弹性接合件在该 每个壳体的内壁上的纵向方向。

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