Hydroxyacyl-coenzyme A dehydrogenase gene, an acyl-coenzyme A thiolase gene, genetically engineered strains and a use thereof

    公开(公告)号:US10351891B2

    公开(公告)日:2019-07-16

    申请号:US15535274

    申请日:2014-12-12

    Abstract: The present invention provides a hydroxyacyl-coenzyme A dehydrogenase gene, an acyl-coenzyme A thiolase gene, genetically engineered strains and a use thereof. The hydroxyacyl-coenzyme A dehydrogenase gene encodes a protein (i) or (ii) as follows: (i) having an amino acid sequence according to SEQ ID NO 2; (ii) derived by substituting, deleting or inserting one or more amino acids in the amino acid sequence defined by (i) and having the same function as that of the protein of (i). The present invention constructs genetically engineered Mycobacterium strains lacking of a hydroxyacyl-coenzyme A dehydrogenase gene or an acyl-coenzyme A thiolase gene, which are used in the preparation of steroidal compounds, such as 1,4-BNA, 4-BNA, 9-OH-BNA, etc. Further, the invention improves the production efficiency and product quality of steroidal drug, improves the utilization of drug precursors, reduces the production costs, and provides the advantages of mild reaction conditions, environmentally friendly, and high economic and social benefits.

    Methods for preparation of polyester/glyoxalated polyvinyl alcohol semi-interpenetrating polymer network hot-melt adhesive
    29.
    发明授权
    Methods for preparation of polyester/glyoxalated polyvinyl alcohol semi-interpenetrating polymer network hot-melt adhesive 有权
    聚酯/乙二醛聚乙烯醇半互穿聚合物网络热熔胶的制备方法

    公开(公告)号:US09346985B2

    公开(公告)日:2016-05-24

    申请号:US14355525

    申请日:2013-06-20

    Abstract: A polyester/glyoxalated polyvinyl alcohol semi-interpenetrating polymer network hot-melt adhesive and preparation method therefore, mainly includes the steps of: 1) transesterification of certain amounts of dimethyl terephthalate and another dibasic ester with 1,4-butanediol and other diols in the presence of an organotin catalyst under a nitrogen atmosphere in a reactor, completed upon the amount of distillation of a monohydric alcohol byproduct reaching greater than 95% of the theoretical amount; 2) after the temperature is maintained for a period of time, adding in a stabilizer and a polycondensation catalyst and incrementally increasing the temperature to trigger a polycondensation reaction under a reduced pressure to produce particles of a copolymer, and freezing and pulverizing the copolymer particles to produce a powder of a copolyester; 3) uniformly blending a polyvinyl alcohol/glyoxal mixture with the powder produced in step 2) at ambient temperature to produce the target product. The product is capable of forming an internal semi-interpenetrating network at application temperatures.

    Abstract translation: 聚酯/乙二醛聚乙烯醇半互穿聚合物网络热熔胶及其制备方法因此主要包括以下步骤:1)将一定量的对苯二甲酸二甲酯与另一种二元酸酯与1,4-丁二醇和其它二元醇酯交换反应 在氮气气氛下在反应器中存在有机锡催化剂,在一元醇副产物的蒸馏量达到​​理论量的95%以上时完成; 2)在温度保持一段时间之后,加入稳定剂和缩聚催化剂,并逐渐增加温度以在减压下引发缩聚反应以产生共聚物颗粒,并将共聚物颗粒冷冻和粉碎 生产共聚酯粉末; 3)在环境温度下将聚乙烯醇/乙二醛混合物与步骤2)中制备的粉末均匀混合以产生目标产物。 该产品能够在应用温度下形成内部半互穿网络。

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