摘要:
Gamma-butyrolactone (“GBL”) and Gamma-hydroxybutyrate (“GHB”) having a unique carbon footprint as defined by the percent modern carbon (pmc) are described herein. The percent modern carbon can be controlled by varying the amounts of biobased, renewable starting materials and petroleum-based starting materials to prepare GBL or GHB having a defined pmc or by preparing mixtures of GBL or GHB prepared from biobased renewable starting materials and GBL or GHB prepared from petroleum-based starting materials.
摘要:
Compositions of polymer blends of polylactic acid (PLA) and polyhydroxyalkanoate are described. In certain embodiments, the PHA is a multiphase copolymer blend having one phase a fully amorphous phase with a glass transition temperature of below 20° C. and is between about 5 to about 45% of the total PHA. Methods of making the compositions of the invention are also described. The invention also includes articles, films and laminates comprising the compositions.
摘要:
Genetically engineered organisms for production of PHA copolymers containing 2-hydroxyacid monomers and the methods of making and using thereof have been developed. The copolymers containing 2-hydroxyacid monomers can be synthesized via biosynthesis by the action of a PHA polymerase in a living cell. By changing the genetic background of the cells, one can control specific metabolic pathways allowing control of the level of glycolic acid co-monomer in the PHA polymer.
摘要:
Toughened polyhydroxyalkanoate resin compositions are disclosed, comprising thermoplastic polyhydroxyalkanoate compositions and a toughener comprising a vinyl acetate homopolymer or copolymer and optionally polyvinyl alcohol.
摘要:
The present invention provides a method of producing polyhydroxyalkanoate (PHA) polymers comprising at least one hydroxyacyl monomer selected from the group consisting of 3-hydroxypropionate, 3-hydroxyvalerate, 4-hydroxybutyrate, 4-hydroxyvalerate, 5-hydroxyvalerate, and 3-hydroxyhexanoate, comprising: expressing in an organism genes encoding a polyhydroxyalkanoate (PHA) synthase and a CoA-dependent aldehyde dehydrogenase, feeding a chemical that is converted by the organism to at least one hydroxyacyl-CoA monomer by an enzyme-catalysed pathway that includes the CoA-dependent aldehyde dehydrogenase activity and allowing polymerisation of the at least one hydroxyacyl-CoA monomer by the PHA synthase to form PHA polymers, and recovering the thus-produced PHA polymers, wherein the organism is produced from a wild-type organism having an endogenous CoA-dependent aldehyde dehydrogenase gene which is modified by gene mutation to increase CoA-dependent aldehyde dehydrogenase activity, or wherein the organism is a recombinant organism in which a gene is recombinantly expressed to encode the CoA-dependent aldehyde dehydrogenase. The present invention also provides a recombinant organism for use in the foregoing method. The present invention also provides a method comprising the step of amplifying a DNA sequence encoding the eutE gene from an E. coli genome using the following oligonucleotides primers: 5' GGT GGT ACC TTA AGA GGA GGT TTT TAT GAA TCA ACA GGA TAT TGA ACA-3' (SEQ ID NO: 1) and 5'-GGT GCG GCC GCT TAA ACA ATG CGA AAC GCA TCG-3' (SEQ ID NO: 2).
摘要翻译:本发明提供了一种生产包含至少一种选自3-羟基丙酸酯,3-羟基戊酸酯,4-羟基丁酸酯,4-羟基戊酸酯,5-羟基戊酸酯和3-羟基己酸酯的羟基酰基单体的聚羟基链烷酸酯(PHA)聚合物的方法, 包括:在生物体中表达编码聚羟基链烷酸酯(PHA)合酶和CoA依赖性醛脱氢酶的基因,通过酶催化途径将由所述生物体转化的化学物质供给至少一个羟酰基-CoA单体,所述酶催化途径包括所述CoA- 依赖的醛脱氢酶活性并允许所述至少一种羟基酰基-CoA单体通过所述PHA合酶聚合形成PHA聚合物,并且回收由此产生的PHA聚合物,其中所述生物由具有内源性CoA- 通过基因突变修饰以增加辅酶A依赖性醛脱氢酶活性或其中 在生物体中是其中基因被重组表达以编码CoA依赖性醛脱氢酶的重组生物体。 本发明还提供了用于上述方法的重组生物体。 本发明还提供了一种方法,包括使用以下寡核苷酸引物扩增编码来自大肠杆菌基因组的eutE基因的DNA序列的步骤:5'GGT GGT ACC TTA AGA GGA GGT TTT TAT GAA TCA ACA GGA TAT TGA ACA- 3'(SEQ ID NO:1)和5'-GGT GCG GCC GCT TAA ACA ATG CGA AAC GCA TCG-3'(SEQ ID NO:2)。
摘要:
The present application provides a method for making poly(3-hydroxypropionate) in a biological system comprising providing one or more substrates selected from the group consisting of 3-hydroxypropionate and 1,3-propanediol, wherein the biological system is selected from the group consisting of bacteria, yeast, fungi, and plants; wherein the biological system expresses enzymes selected from the group consisting of polyhydroxyalkanoate synthase, acyl-CoA transferase, hydroxyacyl CoA transferase, and hydroxyacyl CoA synthetase such that poly(3-hydroxypropionate) accumulates. The present application also provides a method for making a polymer comprising 5-hydroxyvalerate in a biological system comprising providing one or more substrates selected from the group consisting of 5-hydroxyvalerate and 1,5-pentanediol, wherein the biological system is selected from the group consisting of bacteria, yeast, fungi, and plants; wherein the biological system expresses enzymes selected from the group consisting of polyhydroxyalkanoate synthase, acyl-CoA transferase, hydroxyacyl CoA transferase, and hydroxyacyl CoA synthetase such that a polymer comprising 5-hydroxyvalerate accumulates.
摘要:
The present application provides a method for making poly(3-hydroxypropionate) in a biological system comprising providing one or more substrates selected from the group consisting of 3-hydroxypropionate and 1,3-propanediol, wherein the biological system is selected from the group consisting of bacteria, yeast, fungi, and plants; wherein the biological system expresses enzymes selected from the group consisting of polyhydroxyalkanoate synthase, acyl-CoA transferase, hydroxyacyl CoA transferase, and hydroxyacyl CoA synthetase such that poly(3-hydroxypropionate) accumulates. The present application also provides a method for making a polymer comprising 5-hydroxyvalerate in a biological system comprising providing one or more substrates selected from the group consisting of 5-hydroxyvalerate and 1,5-pentanediol, wherein the biological system is selected from the group consisting of bacteria, yeast, fungi, and plants; wherein the biological system expresses enzymes selected from the group consisting of polyhydroxyalkanoate synthase, acyl-CoA transferase, hydroxyacyl CoA transferase, and hydroxyacyl CoA synthetase such that a polymer comprising 5-hydroxyvalerate accumulates.