15 results about "Polyhydroxybutyrate" patented technology

Abstract: A biodegradable polymer composi on, according to the present inven on, comprises polyhydroxybutyrate and poly(3- hydroxybutyrate-co-3-hydroxyhexanoate) blended with thermoplas c starch, one or more compa bilizers selected from the group consis ng of dihexyl sodium sulfosuccinate and maleic anhydride, and one or more addi ves selected from the group consis ng of microcrystalline cellulose and cellulose. Methods of producing a biodegradable polymer use processed cannabis waste as a carbon source. Abstract:

The present disclosure relates to fiber and a method to obtain a fiber / filament comprising lignin, the method comprising the following steps: mixing 60-90 % (v / v) of lignin with a 10 to 40%(v / v) of solvent to obtain a lignin solution; providing polymer pellets; coating the polymer pellets by spraying the lignin solution; drying coated polymer pellets for removing the solvent through evaporation; placing the dried coated pellets into a melt-spinning equipment to obtain the fiber / filament. It also relates a fiber comprising: 70 to 95% (w / w) of a polymer selected from a list consisting of polylactic acid, polyhydroxyalkanoates, polyhydroxybutyrate, polycaprolactone or their mixtures; and 5 to 30% (w / w) of lignin.

This application relates to the field of film packaging technology, and particularly to a high-toughness biaxially oriented polyglycolic acid (PGA) film and its preparation method. The film has a three-layer structure: the upper and lower surface layers comprise an anti-sticking masterbatch and a PGA composite resin, and the core layer comprises a PGA composite resin. The composite resin comprises PGA, a PGA toughening agent, a hydroxyl fatty acid ester, a chain extender, and an antioxidant. The PGA toughening agent is a copolymer polymerized from ε-caprolactone, glycolide, succinic acid, and butanediol, and the hydroxyl fatty acid ester is poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) with a 3-hydroxyhexanoate unit molar content ≥25%. This application achieves synergistic toughening through the toughening agent and PGA, combined with the chain extender and antioxidant, significantly improving film toughness and processing stability while ensuring high barrier properties, high transparency, and high strength, making it suitable for high-requirement packaging applications.

The application discloses cupriavidus capable of producing polyhydroxyalkanoate by using various carbon sources such as ethanol and application thereof. Cupriavidus The strain sp.ZWJ01 has a preservation number of CGMCC No.37462 in the China General Microbiological Culture Collection Center. The strain can grow and accumulate poly-3-hydroxybutyric acid ester by using various substances such as ethanol, volatile fatty acid and sugar as carbon sources; can grow by using mixed carbon sources of ethanol+propionic acid or ethanol+valeric acid and accumulate poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid ester) in cells; and can grow by using mixed carbon sources of ethanol+gamma-butyrolactone or ethanol+1,4-butanediol and accumulate poly(3-hydroxybutyric acid-co-4-hydroxybutyric acid) in cells, and has a good application prospect.

This invention discloses a biodegradable, three-proof (oil-proof, water-proof, and gas-proof) fabric, comprising, from top to bottom, a three-proof functional surface layer, an adhesive layer, and a biodegradable fiber layer; the upper surface of the three-proof functional surface layer has a microscopic uneven structure; the biodegradable fiber layer is a blend of polylactic acid (PLA) fiber and poly(3-hydroxybutyrate) fiber. This invention employs a multi-layer structure to achieve both the three-proof and gas-proof functions and the biodegradability of the fabric. The microscopic uneven structure of the three-proof functional surface layer increases the contact angle between the fabric surface and pollutants, thereby achieving an oil- and water-repellent three-proof effect. The biodegradable layer, made by blending polylactic acid (PLA) fiber and poly(3-hydroxybutyrate) fiber, achieves the fabric's biodegradability. The source of the blended fibers no longer depends on petrochemical products, and under appropriate conditions, it can achieve complete biodegradation, generating harmless small molecules, making it environmentally friendly.

This invention provides a recombinant bacterium and its applications. After specific genetic engineering modifications, this recombinant bacterium can synthesize polyhydroxybutyrate (PHB) using one-carbon compounds such as methanol or carbon dioxide as a carbon source. Specifically, the metabolic pathway of the recombinant bacterium, after optimization, enables the efficient synthesis of PHB from methanol as a raw material via metabolic intermediates such as formaldehyde, 3-phosphoglyceric acid, and acetyl-CoA. The recombinant bacterium constructed in this invention can effectively utilize low-cost carbon sources such as methanol or carbon dioxide to produce PHB, and has promising prospects for industrial application.

This invention discloses a network-like porous poly(3,4-hydroxybutyrate) microsphere, its preparation method, and its applications, belonging to the field of biomedical materials technology. The microspheres exhibit a villous network structure with a continuous, irregular "ridge-valley" topology on their surface. The network-like porous poly(3,4-hydroxybutyrate) microspheres provided by this invention maintain good structural integrity even after 6 months of in vivo implantation, significantly increase ATP levels in fibroblasts under glucose-free conditions, and inhibit cell senescence. They also induce macrophages to transform from a pro-inflammatory M1 phenotype to a pro-repair M2 phenotype, avoiding the excessive inflammatory response commonly seen in PLLA-type microspheres, and demonstrate superior collagen regeneration promotion compared to PLLA-type microspheres. Furthermore, they facilitate cell adhesion and proliferation.

This invention discloses a slow-release electrospun fiber sex pheromone for the Asian corn borer, its preparation method, and its application, relating to the field of pest control technology. The method employs coaxial electrospinning technology, using polyhydroxybutyrate (PHB) as the shell and polylactic acid-glycolic acid (PLA) copolymer as the core, loaded with Asian corn borer sex pheromones to prepare a core-shell structured nanofiber membrane. By optimizing the flow rate ratio of the shell and core layers, the resulting fiber membrane exhibits uniform fiber diameter, and the core-shell structure is clearly visible via TEM. FTIR and TGA analyses confirm successful loading of TDA into the fibers. The fiber membrane has a drug loading of 12.09%, an encapsulation efficiency of 78.56%, and an effective release time of up to 138 days, significantly superior to monoaxial fibers, achieving a 42% burst release inhibition rate in the initial release phase. Field trapping trials show that this fiber membrane is more effective at trapping Asian corn borers than monoaxial electrospun fibers and commercially available butyl rubber stopper carriers.

The application provides a polyhydroxyaliphatic ester material and a preparation method and application thereof, and belongs to the technical field of high polymer materials.The polyhydroxyaliphatic ester material according to the application is prepared from the following components in parts by weight: 40-90 parts of a first polymer and 10-20 parts of a second polymer; wherein the first polymer is composed of two or more polyhydroxyaliphatic esters, and the two or more polyhydroxyaliphatic esters at least include 8-22.5% of poly-3-hydroxybutyric acid ester by mass percentage; and the second polymer is selected from at least one of poly-lactic acid, poly-epsilon-caprolactone, polybutylene succinate, polybutylene succinate-adipate, polybutylene terephthalate-adipate and polyglycolic acid.The polyhydroxyaliphatic ester material not only has good stiffness and toughness, but also is easy to degrade.

This invention discloses a method for preparing functional chemicals from waste polyhydroxybutyrate (PHB). Specifically, it relates to a method for the continuous, low-temperature pyrolysis of waste PHB using a Lewis base-alcohol composite catalyst to prepare high-purity chemicals, comprising the following steps: S1: Preparation of catalyst-active precursor: A Lewis base is reacted with a high-boiling-point fatty alcohol to generate a Lewis base-alcohol composite catalyst with pyrolysis activity in situ; S2: Continuous pyrolysis of PHB and chemical recovery: Waste PHB is crushed and continuously fed into a reactor containing the catalyst described in step S1, and pyrolyzed under reduced pressure. Butenoic acid is obtained by distillation. This invention uses a Lewis base-alcohol composite catalyst to achieve continuous and efficient pyrolysis of waste PHB to synthesize functional chemicals. This process has a low reaction temperature and a high product yield (>99%), effectively promoting the chemical recycling of waste plastics and reducing environmental pollution.

The application discloses a depolymerization method of polyester microplastics, and belongs to the technical field of environmental pollutant treatment. The method specifically comprises the following steps: mixing polyester microplastics and a mixed solvent, and performing reaction in a closed reaction container to obtain a depolymerization product. The polyester microplastics comprise at least one of polylactic acid (PLA), polyethylene terephthalate (PET), polyhydroxybutyrate (PHB) and polybutylene succinate (PBS). The method can realize universal depolymerization of various polyester microplastics under mild reaction conditions, the depolymerization efficiency can be more than 90%, and the product is single, easy to separate and recycle. The whole process has the advantages of green environmental protection, simple operation, low energy consumption, low equipment requirement and the like, is suitable for degradation and environmental remediation of microplastics, and provides an effective and sustainable technical approach for treating microplastic pollution.

This application discloses a bio-compound fertilizer and its preparation method, belonging to the field of organic fertilizer technology. The bio-compound fertilizer consists of inorganic nutrient components, synergistic components, compound functional microbial agents, and modified coating components. This application prepares a modified coating by blending polyacrylic acid and polyβ-hydroxybutyrate, and adding sodium alginate and nano-silica for modification. This coating can precisely respond to changes in rhizosphere pH and nutrient concentration to regulate nutrient release. This invention can achieve stable retention of live microorganisms and intelligent controlled nutrient release, is suitable for various crops and adverse soil conditions, and solves the pain points of existing products such as live bacteria inactivation and nutrient release imbalance, making it suitable for large-scale agricultural planting.

The present disclosure provides a bioprocess for the simultaneous production of Polyhydroxybutyrate (PHB) and Violacein pigment in a single fermentation using a Himalayan bacterial isolate Iodobacter sp. PCH 194, having accession number MTCC 25171. PHB has plastic properties, renewable origin and bio-degradable nature. It can be used for various packaging applications replacing the petrochemicals-based plastics, thus providing greener alternative to environment. Violacein pigment has anti-oxidant, anti-tumoral, anti-bacterial, and photo-protective properties and can be used in cosmetics and pharmaceuticals applications. The present disclosure provides production process of two valuable products i.e. PHB and violacein pigment in a single bioprocess, therefore, is economically attractive, time saving, and commercially feasible process.

The present invention relates to ocular compositions for the controlled release of a therapeutic agent. The ocular composition comprises at least 20% w / w of a therapeutic agent; 5 to 75% w / w of a photopolymerizable composition selected from the group consisting of fragments or monomers of polyalkylene glycol mono-acrylate, polyalkylene glycol diacrylate, polyalkylene glycol methacrylate and polyalkylene glycol dimethacrylate, and mixtures, copolymers, and block copolymers thereof; 0.1 to 40% w / w of a biodegradable polymer selected from the group consisting of lactide / glycolide copolymer (including poly(lactide-co-glycolide) (PLGA)), poly (L-lactide) (PLA), polyhydroxyalkanoates, including polyhydroxybutyrate, polyglycolic acid (PGA), polycaprolactone (PCL), poly (DL-lactide) (PDL), poly (D-lactide), lactide / caprolactone copolymer, poly-L-lactide-co-caprolactone (PLC) and mixtures, copolymers, and block copolymers thereof; and a photoinitiator.