96 results about "Polyhydroxyalkanoates" patented technology

The invention discloses a polyhydroxyalkanoate water-based barrier coating composition and application, and belongs to the technical field of packaging materials. The composition takes water as a dispersion medium and comprises polyhydroxyalkanoate, a plasticizer, an emulsifier and an inorganic nano filler. The stable emulsion with the volume average particle size of 400-700nm is prepared under specific proportioning and process conditions. After the emulsion is applied to a paper substrate according to the dry film coating weight of 10-12 g / m, the obtained coating shows good comprehensive performance: the oxygen permeability is not higher than 580 cm / m.d, the water vapor permeability is not higher than 290 g / m.d, and the heat sealing strength at 130 DEG C is not lower than 5.0 N / 15 mm. The biodegradable paper-based packaging film does not contain fluorine compounds, can be completely biodegraded, and provides a technical path for sustainable paper-based packaging.

The invention discloses a degradable PHA / PU composite water-based barrier coating and a coated paper product, and belongs to the field of biodegradable polymer coatings. The coating composition comprises a high proportion of polyhydroxyalkanoates as a barrier phase and a bio-based polyurethane as a toughening and heat sealing phase. The key innovation lies in that the cooperation of rigid barrier and flexible functions is realized by accurately regulating and controlling the ratio of two phases and adopting bio-based crosslinking, and the problem that the barrier property, the heat sealability and the flexibility of a traditional single material are difficult to consider at the same time is solved under the condition of low coating amount. The invention provides a full-life-cycle green packaging solution, aims to replace a polyethylene spraying film and a fluorine-containing coating, and has a remarkable application value in the field of food packaging.

The invention belongs to the field of high polymer materials, and discloses a double-trigger programmable degradable PHA composition and a preparation method thereof. A cured film structure formed by the composition sequentially comprises an outer protective layer, a trigger layer and an inner functional layer from outside to inside, wherein the outer protective layer takes polyhydroxyalkanoate as a base material, a reversible cross-linked network is introduced into the outer protective layer, the trigger layer is provided with humidity and ion double-trigger microcapsules, and the inner functional layer is used for bearing functional auxiliaries. The cured film can maintain low permeability and mechanical stability before application. After application, under the synergistic effect of specific moisture and ions, the trigger layer is activated, so that the cured film is subjected to step-type improvement of moisture permeability in a preset time window, and a through hole is formed. And finally, integral disintegration is realized through physical structure failure. The technology can be applied to the fields of seed coating and the like, the activity of a biological base material can be ensured by adopting a low-temperature process with the temperature lower than 50 DEG C, and unification of stable protection before application and on-demand disintegration after application is achieved.

A transformed microorganism having an ability to produce a polyhydroxyalkanoate copolymer containing 3-hydroxyalkanoate monomer units having 8 or more carbon atoms includes: an exogenous gene encoding a polyhydroxyalkanoate synthase having an amino acid sequence of any one of SEQ ID NOS: 1 to 4; or an exogenous gene encoding a protein that has an amino acid sequence having a sequence identity of at least 90% with the amino acid sequence of any one of SEQ ID NOS: 1 to 4 and that has polyhydroxyalkanoate synthase activity.

The present invention relates to a fiber made from a mixture comprising an aliphatic polyester, an aliphatic-aromatic polyester and a polyhydroxyalkanoate, and to a method for producing such a fiber. The invention also relates to a filament suitable for three-dimensional printing, said filament being made from a mixture comprising an aliphatic polyester, an aliphatic-aromatic polyester and a polyhydroxyalkanoate, and to a method for producing such a filament.

The invention relates to a material, suitable for additive manufacturing and in particular for fused deposition modeling, wherein said composite material is obtained by fusion of at least two components: - at least one polymer matrix chosen among polyhydroxyalkanoates (PHA), and - at least one auxiliary filler chosen among biobased fillers consisting of biobased particles comprising lignin, cellulose and hemicellulose, wherein said biobased particles have a lignin / hemicellulose mass ratio from 1 to 6. The invention also relates to an additive manufacturing process and a product obtained by an additive manufacturing process.

The present invention relates to novel carbodiimides, to a process for their production, and to the use of the novel carbodiimides in ester-based polyols, in polyethylene terephthalate (PET), in polybutylene terephthalate (PBT), in polytrimethylene terephthalate (PTT), in copolyesters, in thermoplastic polyester elastomers (TPE E), in ethylene vinyl acetate (EVA), in polylactic acid (PLA) and / or in PLA derivatives, in polybutylene adipate terephthalate (PBAT), in polybutylene succinate (PBS), in polyhydroxyalkanoates (PHA), in blends, in triglycerides, in thermoplastic polyurethanes, in polyurethane elastomers, in PU adhesives, in PU casting resins, for PU coatings or in PU foams as stabilizers.

The present invention concerns a composition for a horticultural pot comprising a solid residue of digestate from methanization and / or a solid residue from composting and a biodegradable polymer chosen from polyhydroxyalkanoates (PHA), its preparation and its use in the manufacture of such a pot.

The technology described herein is directed to engineered chemoautotrophic bacteria and methods of producing sustainable biomolecules. In several aspects, described herein are engineered bacteria and corresponding methods, compositions, and systems for the production of products such as polyhydroxyalkanoates (PHA), sugar feedstocks, and lipochitooligosaccharide (LCO) fertilizers.

A genetically engineered strain of Pseudomonas is provided, which is capable of metabolizing lactose as a sole carbon source in the production of polyhydroxyalkanoates (PHAs). A method of engineering microorganisms and a method of PHA production are also provided, wherein lactose is used as a sole carbon source.

A biopolymer such as poly(gamma glutamic acid) 100, bacterial cellulose (200) and poly(hydroxyalkanoates) (300) synthesised from a biowaste substrate 102, (204, 304) comprising at least one of: a cell

The invention relates to a method for rapidly synthesizing polyhydroxyalkanoate based on segmented feeding oxygen-limiting mixed flora, and belongs to the technical field of solid waste resource utilization. According to the method disclosed by the invention, the functional flora is obtained from the activated sludge through a limited oxygen condition and a feeding mode of separately adding the carbon source and the nutrient solution, so that the synthesis rate of the polyhydroxyalkanoate in a traditional sequencing batch reaction device is effectively improved. In addition, the stability of the polyhydroxyalkanoate synthesized by the functional flora is verified by prolonging the culture time, and the result shows that the polyhydroxyalkanoate can be rapidly and stably synthesized by the functional flora screened under the limited oxygen condition in a sectional feeding mode. The method not only improves the synthesis efficiency of polyhydroxyalkanoate and reduces the production cost, but also has important industrial application value. Through further optimization and large-scale application, the method is expected to play a key role in the fields of environmental protection and bioplastic production.

A process for producing polyhydroxyalkanoates, comprising the steps of: fermenting production medium comprising pongamia oil using bacteria from the Cupriavidus, Burkholderia, or Alcaligenes genera capable of producing polyhydroxyalkanoates; wherein the pongamia oil is extracted from the seeds of Pongamia species and clarified by filtering before the crude, unprocessed pongamia oil is added to the production medium; and extracting the polyhydroxyalkanoates comprising a homopolymer comprising a 3-hydroxybutyrate (3HB) unit amongst other sole PHB polymers from within the bacteria.

The invention provides a method for improving the molecular weight of polyhydroxyalkanoates (polyhydroxyalkanoates, called PHA for short) synthesized by microorganisms, and relates to a method for improving the molecular weight of the polyhydroxyalkanoates (polyhydroxyalkanoates, called PHA for short). By knocking out or knocking down endogenous (intracellular) carboxylesterase, lipase, esterase, thioesterase and PHA degrading enzyme genes of bacteria for synthesizing PHA, the molecular weight of various synthesized PHA is obviously improved. The method has universality for improving the molecular weight of various PHAs synthesized by different species of bacteria, the mechanical property of the PHA can be improved by improving the molecular weight of the PHA, and new performance is provided for expanding the application of the PHA.

To provide a poly(3-hydroxyalkanoate)-based resin-containing fiber capable of yielding a fiber structure that is hard to tear.SOLUTION: The present invention provides a fiber comprising a resin composition, the resin composition comprising a poly(3-hydroxyalkanoate)-based resin and a polylactic acid-based resin, wherein the content of the polylactic acid-based resin is 40-70 pts.wt. per 100 pts.wt. in total of the poly(3-hydroxyalkanoate)-based resin and the polylactic acid-based resin, and the weight average molecular weight of the polylactic acid-based resin is 20,000-120,000.SELECTED DRAWING: None

The present disclosure relates to a polymeric composition having an amorphous polyhydroxyalkanoate (PHA) and a polymer, and uses thereof.

This invention discloses a biodegradable, highly bioactive magnesium bone particle, its preparation method, and its applications, belonging to the field of biomedical materials technology. Using magnesium bone particles as a matrix, an active composite coating layer comprising biodegradable polymer components and inorganic phase components is formed on its surface to construct biodegradable, highly bioactive magnesium bone particles. The biodegradable polymer components are one or more selected from polycaprolactone, polylactic acid, polylactic-co-glycolic acid copolymer, polyhydroxyalkanoates, chitosan, and their derivatives; the inorganic phase is one or more selected from hydroxyapatite, titanium dioxide, calcium phosphate materials, and combinations thereof. The preparation method includes magnesium bone particle matrix preparation, active composite layer slurry preparation, magnesium bone particle coating, and post-treatment. The prepared biodegradable, highly bioactive magnesium bone particles exhibit good degradation regulation performance and excellent bioactivity, and can be used in bone tissue engineering, bone defect repair, and scaffold filling fields.

The invention discloses a self-emulsifying bio-based polyester stabilized multi-class bio-based polymer water-based emulsion as well as a preparation method and application thereof, and belongs to the technical field of bio-based high polymer materials and water-based resin. According to the preparation method disclosed by the invention, a dual-interface synergistic stabilization mechanism is constructed by adopting the self-emulsifying bio-based polyester containing furandicarboxylic acid and the rosin-based component, so that efficient emulsification and interface compatibility of various hydrophobic bio-based film-forming polymers such as polyhydroxyalkanoate and polylactic acid are realized. The emulsion prepared by the invention has excellent storage stability and machining adaptability, maintains extremely high bio-based content and extremely low volatile organic compound residue while remarkably improving the water resistance, oil resistance and gas barrier property of a paper-based coating, and completely meets the safety standard of food contact-grade materials. According to the preparation process, the microstructure of dispersed phase particles is accurately regulated and controlled through phase inversion and high-pressure homogenization, and an ideal green coating solution is provided for high-performance environment-friendly paper-based packaging.

The present invention relates to a method for preparing polyhydroxyalkanoate nanobeads. The present invention optimizes a process in which physical cell disruption is performed in order to directly recover polyhydroxyalkanoates, produced in the cells of polyhydroxyalkanoate-producing bacteria, in the original form thereof, and the recovered polyhydroxyalkanoates are washed. Using the optimized method for preparing polyhydroxyalkanoates according the present invention has the effect that polyhydroxyalkanoates can be prepared with high purity and high yield without an organic solvent, and polyhydroxyalkanoate nanobeads can be directly obtained without a separate forming process.

The purpose of the present invention is to provide a method for producing PHA which enables efficient filtering. The above problem is solved by providing a method for producing PHA, said method comprising a step for using a filtering material having an airflow rate of 0.01-5.0 cc / cm2 / sec to perform dead-end filtration of an aqueous PHA suspension having a pH of 2.5-5.5, wherein the amount of PHA-surface-adhering protein in the aqueous PHA suspension is not more than 2,000 ppm, and the liquid density of the aqueous PHA suspension in the filtration step is 0.50-1.08 g / mL.

This invention relates to the field of downstream product processing technology in bioengineering, specifically disclosing a method for directly extracting polyhydroxyalkanoates (PHA) from fermentation broth using plasticizers. The method includes: first, adding a certain amount of plasticizer to the fermentation broth producing PHA, mixing thoroughly to form a turbid liquid for cell disruption and extraction; then, performing solid-liquid separation to remove the aqueous phase and plasticizer, retaining the PHA-containing solid phase; second, repeatedly washing with detergent to remove residual plasticizer and other impurities, obtaining a solid after solid-liquid separation; finally, drying the solid to obtain the PHA; the plasticizer and detergent used are recycled. This method integrates cell disruption and PHA extraction, featuring a simple process, environmental friendliness, low investment cost, low energy consumption, high production efficiency, high product purity, and stable quality, making it suitable for industrial production.

In alternative embodiments, provided are methods for selecting, isolating and recombinantly engineering methane- and hydrogen-oxidizing autotrophs, including methanotrophic bacteria, for the production of biopolymer, renewable polymer or biodegradable polymer such as polyhydroxyalkanoate (PHA) such as polyhydroxybutyrate (PHB) and co-polymers, and products of manufacture and kits, and methods for using them to produce biopolymer, renewable polymer or biodegradable polymer. Provided and isolation are efficient methane-consuming methane- and hydrogen-oxidizing autotrophic microbes for PHA (for example, PHB and co-polymers) production and methods for using them, which in alternative embodiments the methanotrophs are genetically modified to improve C1 (methane or methanol)-to PHA conversion parameters.

A skin film layer, a sealant film layer, and a combination of a sealant film layer and a skin film layer, wherein the sealant film layer and the skin film layer each contain a blend of 0 to about 80 wt.% polyhydroxyalkanoate (PHA) and about 20 to about 100 weight percent polylactic acid (PLA), and optionally, a small amount of other biopolymers, other polymers, nucleating agents, chain extenders, fatty amides, and fillers; the skin film layer, the sealant film layer, and the combination of the sealant film layer and the skin film layer; and a core film layer containing a blend of about 30 to about 80 wt.% polyhydroxyalkanoate (PHA), about 20 to about 40 wt.% polylactic acid (PLA), and optionally, a small amount of other biopolymers, other polymers, nucleating agents, chain extenders, fatty amides, and fillers; a biaxially stretched industrially or home-compostable film web having at least three coextruded layers selected from the above.

This invention discloses a high-bio-based PHA-acrylate latex paint, its preparation method, and its application, belonging to the field of waterborne coating technology. The film-forming material of this latex paint comprises 60% to 90% polyhydroxyalkanoates (PHA) with a moderate crystallinity of 40% to 60%, and 10% to 40% of a specific bio-based acrylate copolymer with a Tg not exceeding 5℃. This invention constructs a core-shell microstructure of a flexible acrylate phase encapsulating a rigid PHA phase through a key process including ultrasonic treatment. This structure achieves low-temperature film formation without VOC film-forming aids, resulting in a paint film with a bio-based content exceeding 70%, a VOC content below 0.5 g / L, and a wash resistance greater than 7000 cycles, solving the technical challenge of balancing high bio-based content and high performance in PHA coatings.

The invention provides a light response type curcumin antibacterial preservative film and a preparation method and application thereof, the preservative film is of a double-layer composite structure, an inner layer is a light response antibacterial layer which takes polyethyleneimine modified sodium alginate as a base material, is covalently grafted with curcumin through an amido bond and is uniformly dispersed with graphite-like phase carbon nitride (g-C3N4); and the outer layer is a protective barrier layer which takes polyhydroxyalkanoate as a base material and is loaded with nano SiO2 and VE / hydroxypropyl-beta-cyclodextrin inclusion compound. The preparation of the antibacterial film can solve the problem that curcumin is easy to migrate and lose, the efficient antibacterial effect is realized by utilizing the light synergistic effect of g-C3N4 and curcumin, and meanwhile, the outer layer film effectively prevents the damage of illumination to fruits and vegetables while ensuring the light triggering efficiency of the inner layer by scattering strong light and scavenging free radicals. The film has long-acting antibacterial, antioxidant and physical barrier functions, and is suitable for high-quality preservation of foods such as fruits, vegetables and the like.

Biodegradable waste collection bag (1) for the collection of organic waste in accordance with the Bio-Waste Ordinance, comprising: • a foil cover (3) with two carrying handles (1), • Made from extrudable, 100% biodegradable polymer material selected from polyhydroxyalkanoates (PHA), modified regenerated cellulose, starch esters / ethers or mixtures thereof, • a visual design (2) to clearly distinguish from conventional plastic carrier bags, • a liquid-tight seam (4) and a bottom area (5), wherein the film sleeve (3) has a thickness in the range of 21 µm to 26 µm, preferably 23 µm to 25 µm, and a maximum of 80 µm and remains tear-resistant and liquid-tight for at least 10 days when filled (≥ 2-5 l moist biowaste).

The present invention relates to a fiber obtainable by or obtained by a process comprising the steps of: - spinning a melt of an aliphatic polyester, an aliphatic-aromatic polyester and a polyhydroxyalkanoate through a hollow fiber spinning nozzle to obtain a precursor fiber; and - cooling the precursor fiber under a temperature gradient, thereby obtaining a fiber. The present invention also relates to yarns and apparel made from such fibers and to a process for making such fibers.

The present invention relates to the field of anorectal drug delivery, and more specifically, to an anorectal therapeutic drug delivery device, comprising a support frame, an arc-shaped arm plate, and a film applicator fixedly mounted on the inner sidewalls of two sets of arc-shaped arm plates, wherein the inner sidewalls of the film applicator are respectively movably sleeved with a rotating rod and a transmission slide rod at the edge positions on both sides, and a gelatin film is movably sleeved on the outer surfaces of the rotating rod and the transmission slide rod, and the interior of the film applicator is filled with a polyhydroxyalkanoate adhesive. The arc-shaped arm plate is used to expand the interior of the anorectal region, and at this time, the injection barrel is used to apply ointment to the wounds and damaged areas inside the anorectal region at specific points, and the ointment is evenly applied. At this time, tweezers are used to pull the surface of one side of the gelatin film. As the gelatin film is pulled and moved on the surface of the rotating rod, the polyhydroxyalkanoate adhesive can be repeatedly applied to the surface of the gelatin film.

Disclosed is a single-unit biotechnology method for simultaneously recovering polyhydroxyalkanoates (PHAs) and triacylglycerides (TAGs). The present invention relates to a method for producing biomass in the form of a mixed microbial culture containing PHAs and TAGs. More specifically, the method comprises certain steps that occur in a single discontinuous sequential reactor.