3-Hydroxybutyrate polymers
    6.
    发明授权
    3-Hydroxybutyrate polymers 失效
    3-羟基丁酸酯聚合物

    公开(公告)号:US4477654A

    公开(公告)日:1984-10-16

    申请号:US393407

    申请日:1982-06-29

    IPC分类号: C08G63/06 C12P7/62

    摘要: High molecular weight copolymers containing 3-hydroxybutyrate residue, i.e. units of the formula--O.CH(CH.sub.3).CH.sub.2.CO--and up to 50 mole % of residues of other hydroxy acids, viz units of the formula--O.CR.sup.1 R.sup.2.(CR.sup.3 R.sup.4).sub.n.CO--where n is 0 or an integer and, if n=1 and R.sup.2, R.sup.3, and R.sup.4 =H, R.sup.1 is not methyl.The copolymers are made microbiologically: for part of the cultivation the micro-organism is under conditions such that polymer is accumulated, e.g. by limitation of a nutrient, e.g. nitrogen source, required for growth but not polyester accumulation. For at least part of this period of polymer accumulation the substrate is an acid or a derivative thereof that gives the comonomer units. Proprionic acid, which gives polymers where n=1, R.sup.2 =R.sup.3 =R.sup.4 =H and R.sup.1 =C.sub.2 H.sub.5, is the preferred acid.

    摘要翻译: 含有3-羟基丁酸酯残基的高分子量共聚物,即式-O.CH(CH 3)CH 2 CO-的单元,以及至多50摩尔%的其它羟基酸的残基,即式-O.CR1R2的单位。 (CR 3 R 4)n.CO-,其中n为0或整数,如果n = 1且R 2,R 3和R 4 = H,则R 1不是甲基。 共聚物由微生物制成:对于部分培养,微生物处于使聚合物累积的条件下,例如, 通过营养的限制,例如, 氮源,生长所需,但不是聚酯堆积。 对于聚合物积聚的这个时期的至少部分,底物是赋予共聚单体单元的酸或其衍生物。 丙酸,其中n = 1,R2 = R3 = R4 = H,R1 = C2H5的聚合物是优选的酸。

    Separation process
    8.
    发明授权
    Separation process 失效
    分离过程

    公开(公告)号:US4910145A

    公开(公告)日:1990-03-20

    申请号:US374567

    申请日:1989-06-30

    IPC分类号: C12N1/06 C12P7/62

    摘要: An aqueous suspension of micro-organism cells containing a 3-hydroxybutyrate polymer are subjected to a proteolytic enzyme digestion and/or a surfactant digestion in order to solubilise cell material other than the 3-hydroxybutyrate polymer.Prior to, or during the digestion, but before any proteolytic enzyme digestion step, the suspension is heated to at least 80.degree. C. to denature nucleic acids which otherwise hinder separation of the 3-hydroxybutyrate polymer containing residue from the suspension.

    摘要翻译: 将含有3-羟基丁酸酯聚合物的微生物细胞的含水悬浮液进行蛋白水解酶消化和/或表面活性剂消化,以溶解3-羟基丁酸酯聚合物以外的细胞材料。 在消化前或消化期间,但在任何蛋白水解酶消化步骤之前,将悬浮液加热至至少80℃以使另外阻碍从悬浮液中分离含有3-羟基丁酸酯聚合物的残留物的核酸变性。