Synthesis of catechol from biomass-derived carbon sources
    4.
    发明授权
    Synthesis of catechol from biomass-derived carbon sources 失效
    从生物质来源的碳源合成儿茶酚

    公开(公告)号:US5629181A

    公开(公告)日:1997-05-13

    申请号:US122919

    申请日:1993-09-16

    摘要: A method is provided for synthesizing catechol from a biomass-derived carbon source capable of being used as a host cell having a common pathway of aromatic amino acid biosynthesis. The method comprises the steps of biocatalytically converting the carbon source to 3-dehydroshikimate in said host cell, biocatalytically converting the DHS to protocatechuate, and decarboxylating the protocatechuate to form catechol. Also provided is a heterologous E. coli transformant characterized by the expression of genes encoding transhetolase, DAHP synthase, and DHQ synthase, further characterized by the constitutive expression of structural genes encoding 3-dehydroshikimate dehydratase and protocatechuate decarboxylase.

    摘要翻译: 提供了用于从能够用作具有芳香族氨基酸生物合成的共同途径的宿主细胞的来自生物质的碳源合成儿茶酚的方法。 该方法包括在所述宿主细胞中将碳源生物催化转化为3-脱水莽草酸的步骤,将DHS生物催化转化为原儿茶素,并使原儿茶酸脱羧形成儿茶酚。 还提供了异源大肠杆菌转化体,其特征在于表达编码transhetolase,DAHP合酶和DHQ合酶的基因,其特征还在于编码3-脱水酪氨酸脱水酶和原儿茶素脱羧酶的结构基因的组成型表达。

    Process for manufacturing xylose
    5.
    发明授权
    Process for manufacturing xylose 失效
    制造XYLOSE的工艺

    公开(公告)号:US5238826A

    公开(公告)日:1993-08-24

    申请号:US537459

    申请日:1990-06-14

    摘要: Process for manufacture of D-xylose characterized by the fact that:in a first step, syrup of D-xylulose is subjected to an enzymatic isomerization in M.sub.3 providing a mixture of D-xylose and D-xylulose,in a second step, the abovesaid mixture is subjected to chromatographic treatment in M.sub.4 leading to at least two fractions of which one is highly enriched in D-xylose (fraction X.sub.1) et of which the other is highly enriched in D-xylulose (fraction X.sub.2),in a third step, the fraction X.sub.2 is recycled through a pipe P to M.sub.3,the D-xylose being recovered from the fraction X.sub.1, the latter can also be subjected directly to a hydrogenation step.

    摘要翻译: 制造D-木糖的方法,其特征在于:在第一步中,在第二步中,在第一步中,在第二步中,在提供D-木糖和D-木酮糖的混合物的M3中进行D-木酮糖的糖浆进行酶促异构化 混合物在M4中进行色谱处理,导致至少两个级分,其中一种高度富含D-木糖(级分X1)等,其中另一种高度富含D-木酮糖(级分X2),第三步中, 馏分X2通过管P至M3再循环,D-木糖从馏分X1回收,后者也可以直接进行氢化步骤。

    Solubilization and hydrolysis of carbohydrates
    8.
    发明授权
    Solubilization and hydrolysis of carbohydrates 失效
    碳水化合物的溶解和水解

    公开(公告)号:US4713118A

    公开(公告)日:1987-12-15

    申请号:US561148

    申请日:1983-12-14

    CPC分类号: C13K1/02 C13K1/06

    摘要: A process for the modification, solubilization and/or hydrolysis of a glycosidically linked carbohydrate having reducing groups using a mixture comprising water, an inorganic acid and a halide of lithium, magnesium or calcium. The process is particularly useful for converting cellulose (derived for example from waste-paper, wood or sawdust) or starch to glucose. When cellulose is the starting material the preferred halide is a lithium halide. When starch is the starting material a magnesium halide is preferred.

    摘要翻译: 使用包含水,无机酸和锂,镁或钙的卤化物的混合物改性,增溶和/或水解具有还原基团的糖苷连接的碳水化合物的方法。 该方法特别适用于将纤维素(例如衍生的例如废纸,木屑或锯屑)或淀粉转化为葡萄糖。 当纤维素是原料时,优选的卤化物是卤化锂。 当淀粉是原料时,优选卤化镁。