55 results about "Active packaging" patented technology

The invention discloses an intelligent developing active packaging film thickness uniformity detection method and system, and relates to the field of film thickness uniformity detection.The intelligent developing active packaging film thickness uniformity detection method comprises the steps that a terahertz time-domain spectrum detection device is arranged, and area scanning is conducted on a to-be-detected developing active packaging film; network edge nodes are set, and data acquisition, data preprocessing and film thickness uniformity judgment are processed step by step; based on a convolutional neural network algorithm, preliminarily confirming the film thickness of the developing active packaging film; environment data are collected, and the film thickness of the color developing active packaging film is corrected through an environment error compensation algorithm; analyzing the influence of different film thicknesses of the developing active packaging films on the data of the terahertz time-domain spectroscopy instrument, and performing feedback correction on the film thicknesses of the developing active packaging films; and carrying out uniformity evaluation on the to-be-detected developing active packaging film area. The method has the advantages that non-contact detection is adopted, the efficiency of detecting the film thickness uniformity of the developing active packaging film is effectively improved, and the error influence caused by the film thickness and the environment is avoided.

The invention discloses a use of a polylactic acid active packaging film in the preservation of B. cerana. The polylactic acid active packaging film is prepared by using an Ag@MOF carrier to load a natural antibacterial agent, which is then fully mixed with polylactic acid and then melt-extrusion blow molding. The packaging film is used to package the B. cerana to achieve active packaging of the B. cerana, inhibit the growth of microorganisms, and extend the shelf life of the B. cerana. The preservation method has a simple process and is easy to operate. The materials used are biodegradable, reducing environmental pollution caused by packaging. The natural antibacterial agent, Litsea cubeba essential oil, is added to the preservative film, which can effectively inhibit the growth and reproduction of major spoilage bacteria isolated and identified from the B. cerana. The Ag@MOF is used to load the Litsea cubeba essential oil, which can effectively control the release rate of the Litsea cubeba essential oil, achieving long-lasting antibacterial and antioxidant purposes. The preservation method can effectively extend the storage period of the B. cerana.

The invention discloses a carbon quantum dot-polyvinyl alcohol composite film and a preparation method thereof, and belongs to the technical field of food packaging fresh-keeping materials. The composite film is prepared by taking apocynum venetum carbon quantum dots and polyvinyl alcohol as raw materials under the action of a plasticizer, wherein the apocynum venetum carbon quantum dots are prepared from apocynum venetum fiber powder, dithiosalicylic acid and urea through a hydrothermal method. The composite film provided by the invention has excellent ultraviolet shielding, pH-responsive fluorescence discoloration, antibacterial and antioxidant properties, and can realize visual monitoring of the freshness of high-protein food. The preparation method disclosed by the invention is simple in process, environment-friendly, suitable for the field of food active packaging and wide in application prospect.

The invention aims to provide a preparation method and application of a CMC / PVA active packaging film coated with chitosan-tannic acid on the surface, and belongs to the field of food preservation. Comprising the following steps: firstly, preparing a CP40 film, and then preparing a CP40 / CT% composite film: preparing a chitosan solution with the mass concentration of 1%, adding tannic acid TA into the chitosan solution, stirring for 30 minutes in a shading manner at room temperature to form a CT coating solution, flatly laying the prepared CP40 film on a planar carrier, coating the surface of a substrate film with the CT coating solution, and putting the composite film and the carrier into a drying oven at 45 DEG C for constant-temperature drying, so as to obtain the CP40 / CT% composite film. And after the solvent of the coating layer is completely volatilized, taking out and stripping to obtain the CP40 / CT% composite film. Under the action of hydrogen bonds and electrostatic attraction, a compact network structure of an amorphous-weak crystal region is formed in the composite film, so that the interface bonding strength of the film is enhanced, and the rigidity and flexibility of the film are balanced. The physical and chemical properties and biological activity of the composite membrane are synergistically optimized, and the composite membrane has obvious degradation signs after being buried in soil for 35 days and belongs to a biodegradable material.

The invention belongs to the technical field of biodegradable composite materials, and discloses a preparation method and application of a PVA-PLA (Polyvinyl Acetate-Poly Lactic Acid) multi-layer high-barrier film based on metal-phenolic network enhancement. The preparation method comprises the following steps: firstly, preparing a PVA (Polyvinyl Alcohol) composite solution containing lignin and a polyphenol compound, and carrying out film casting to obtain a base layer film; then preparing a PLA coating solution containing Femetal ions; and finally, immersing the base layer film into the PLA coating liquid, and constructing a multi-layer structure through solvent volatilization. The core of the invention is that a polyphenol compound in the base layer and Fe in the PLA layer are utilized to form a metal-phenolic aldehyde network coordination bond at an interface, and the metal-phenolic aldehyde network coordination bond is used as a molecular bridge, so that the interface bonding force between PVA and PLA is greatly enhanced, and the problem of interface layering caused by polarity difference between PVA and PLA is effectively solved. Meanwhile, due to the synergistic effect of the lignin and the polyphenol compound, the film is endowed with excellent oxygen, carbon dioxide and water vapor barrier properties and an antibacterial function. The film is green and safe, and is suitable for active packaging of food, especially fresh keeping of fruits and vegetables.

The invention discloses a polyving akohol-based composite film with multiple functions and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite film is prepared by taking polyvinyl alcohol (PVA) as a matrix and introducing an iron-tannic acid coordination complex (Fe-TA) and nano zinc oxide (ZnO NPs). The preparation method comprises the following steps: preparing a PVA solution; the preparation method comprises the following steps: coordinating ferric chloride hexahydrate with tannic acid to form a Fe-TA complex solution, and compounding the Fe-TA complex solution with a PVA solution; and adding the nano-zinc oxide dispersion liquid into the composite liquid, and carrying out defoaming, curtain coating and drying to form the film. Through the synergistic effect of Fe-TA and ZnO NPs, the problems that a pure PVA film is high in hydrophilicity and single in function are effectively solved. The obtained composite film has excellent mechanical strength, high oxygen and water vapor barrier property, efficient near-infrared light thermal response capability and long-acting antioxidant activity, and has wide application prospects in the fields of food active packaging, intelligent packaging and the like. The method is simple in process, environment-friendly and easy for large-scale production.

The invention belongs to the technical field of food packaging materials, and particularly relates to a Co-MOF (at) CEO intelligent active packaging film and a preparation method and application thereof. Cinnamon essential oil is embedded in a cobalt-based metal organic framework to form composite nanoparticles with antibacterial and ammonia-sensitive functions, then the composite nanoparticles and potato starch are mixed, a film is formed through a solution casting method, and the intelligent active packaging film is obtained. According to the preparation method of the intelligent active packaging film provided by the invention, the water solubility of the potato starch packaging film is reduced, the prepared intelligent active packaging film has good antibacterial, antioxidant activity, mechanical and barrier properties and good sensitivity to ammonia, the freshness of meat can be monitored in real time only through the color change of the packaging film, and the method is suitable for large-scale popularization and application. The fresh-keeping and freshness visual monitoring of food such as fish meat and the like can be realized at the same time, and the method has a good application prospect in the field of intelligent active packaging.

The invention discloses a dihydromyricetin enhanced gutta-percha / polylactic acid composite active packaging film and a preparation method thereof. According to the film, gutta-percha and polylactic acid are used as base materials, raspberry tea dihydromyricetin is used as an active component, and synergistic improvement of mechanical properties and biological activity is achieved. The specific preparation method comprises the following steps: dissolving gutta-percha in a first organic solvent to prepare a solution A; polylactic acid and a plasticizer are dissolved in a second organic solvent to prepare a solution B; and mixing the solution A and the solution B, adding dihydromyricetin, carrying out a stirring reaction, and carrying out film casting. The obtained film is faint yellow and semitransparent, the thickness is 30-40 microns, the tensile strength is larger than or equal to 33 MPa, the elongation at break is larger than or equal to 280%, and the good water vapor and oxygen barrier property is achieved. Benefited from the addition of dihydromyricetin, the film has remarkable bacteriostatic activity on escherichia coli and staphylococcus aureus, the DPPH free radical scavenging rate can reach 92.6%, the comprehensive performance is remarkably superior to that of a gutta-percha / polylactic acid composite film, and the gutta-percha / polylactic acid composite film has important application potential in the field of active packaging of food and agricultural products.

The present invention provides a method for preparing a multifunctional polylactic acid active packaging composite film, the preparation method comprising: (1) enclosing cinnamaldehyde in a hydrophobic cavity of hydroxypropyl-β-cyclodextrin, and then cross-linking with cellulose citrate and anthocyanidin; (2) using a pure polylactic acid film as a substrate, compounding the cross-linking system obtained in (1) with polylactic acid by electrospinning; and (3) reacting tannic acid with the composite film prepared in (2) through a host-guest interaction to obtain a multifunctional polylactic acid active packaging composite film. The composite packaging film has multiple functions such as antibacterial properties, antioxidant properties, and intelligent color development, and has improved tensile strength, thereby effectively improving the functions of the polylactic acid film.

The invention discloses a preparation method and application of a compound with emulsifying and antibacterial dual functions, and belongs to the technical field of food active packaging materials. The compound is prepared through a two-step method, a synergistic antibacterial mechanism is formed by means of the hydrophobic binding effect of the amyloid fiber and the cationic electrostatic interaction of the chitosan, and meanwhile excellent emulsion stability and antibacterial activity are achieved through the hydrogen bond-electrostatic interaction of the amyloid fiber and the chitosan. When the compound is applied to preparation of the polysaccharide-based composite film, the mechanical property of the film can be remarkably improved. The raw materials are all natural degradable components, the preparation process is simple, and the obtained composite film can efficiently prolong the shelf life of aquatic products, conforms to the green packaging development trend and has important application value in the field of food active packaging.

The invention belongs to the technical field of food preservation, and provides a gelatin / chitosan film loaded with brown algae extract and a preparation method and application thereof, and the preparation method comprises the following specific steps: (1) mixing brown algae with an ethanol solution, and concentrating to obtain the brown algae extract; (2) mixing a gelatin solution, a chitosan solution, glycerol and the brown algae extract to obtain a film precursor; and (3) carrying out tape casting on the film precursor to obtain the gelatin / chitosan film loaded with the brown algae extract. The brown algae extract is rich in effective active ingredients such as organic acid, so that the film is endowed with good antioxidant and antibacterial properties. By adding the extract, the mechanical property, the water vapor barrier property and the thermal stability of the composite film are effectively improved, and an active packaging material with a uniform structure is formed. In fresh-keeping application, the film effectively delays the quality deterioration process of the instant sea cucumbers in the normal-temperature storage period through the active function of the film, and the texture and sensory quality of the product are remarkably maintained.

The invention belongs to the technical field of food packaging materials and bacteriostatic packaging films, and discloses an active packaging film capable of generating singlet oxygen bacteriostasis based on light driving, a preparation method and application of the active packaging film in fresh keeping of fruits, vegetables and edible mushrooms, and the active packaging film comprises the following steps: S1, obtaining a chitosan film solution A for later use; s2, obtaining a polyvinyl alcohol membrane solution B for later use; s3, obtaining a polyvinyl alcohol / chitosan composite membrane solution D based on food-grade nano silicon dioxide loaded sodium copper chlorophyllin; s4, preparing the bacteriostatic active packaging film, and using the bacteriostatic active packaging film in combination with blue-violet light. The antibacterial film disclosed by the invention has the advantages of high barrier property, ultraviolet-resistant optical property, strong and flexible mechanical property, good thermal stability, biodegradability and antibacterial property of CD-ROM movable product singlet oxygen (1O2). The packaging film can be used as a bio-based active package, can reduce the environmental pollution of a traditional petroleum-based packaging film, can prolong the shelf life of fruits, vegetables and edible mushrooms, and has the dual effects of environmental protection, bacteriostasis and preservation.

The invention belongs to the technical field of intelligent food packaging films, and particularly relates to a preparation method and application of a biomass-based active packaging film. According to the film, a double-network skeleton is constructed by using wood nano cellulose / sodium alginate, so that the film is endowed with excellent flexibility, ultraviolet shielding property and antibacterial activity; furthermore, zein nanoparticles loaded with curcumin are uniformly embedded into the matrix, so that ammonia-sensitive color development and curcumin slow release synergism are realized. Due to the introduction of the curcumin-zein nanoparticles, the mechanical strength, the water-oxygen barrier property, the oxidation resistance and the antibacterial property of the film are further remarkably improved, and reversible color change occurs in the presence of NH3, so that the meat product decay visual detection is realized. Fresh shrimps are packaged with the film and stored at 4 DEG C, the activity of polyphenol oxidase can be remarkably inhibited, blackening and microbial proliferation are delayed, and a green, visible and controllable multifunctional packaging strategy is provided for a meat supply chain.

The present invention relates to a method for producing sodium alginate-based films comprising the Escherichia coli-specific bacteriophage vB_EcoM-P34, intended for use as a packaging material in the food industry.

The application discloses a kind of intelligent active packaging nanofiber membrane materials with pH indication and antibacterial function and its preparation method and application, belong to food preservation material technical field.Preparation method is first mixed with antibacterial agent to prepare core layer spinning fluid, polyvinyl alcohol, octenyl succinate starch and water-soluble pH color response indicator are mixed to prepare shell layer spinning fluid, and the target nanofiber material is obtained by coaxial electrospinning technology one-step forming.The application realizes the accurate core-shell partition loading of pH indicator and antibacterial agent by coaxial spinning, effectively avoids the mutual reaction of both, while greatly simplifying the preparation process, without pre-synthesizing functional nanodispersion.The obtained membrane material has rapid pH response color change and long-acting antibacterial performance, can realize food freshness visual monitoring and preservation, and is suitable for intelligent active packaging of perishable food such as aquatic products.

The application provides an edible active coating for preventing dry consumption under an ultralow temperature condition and a preparation method, and belongs to the technical field of active packaging. The application combines double-layer coatings, inhibits free radical oxidation generated by freezing through an inner antioxidant, and effectively locks water and blocks external oxygen permeation through the synergistic effect of an outer high-barrier structure, thereby significantly improving the freezing preservation effect of food, and the raw materials are natural and safe, the preparation method is reasonable, and the application has good practical application value. The application solves the problems of poor effects of edible freezing protection coatings suitable for extremely cold environments in the prior art.

An entrained polymer is provided that includes in a blended form, a base polymer and a conjugated olefin, optionally lycopene or a derivative thereof. The resulting entrained polymer is useful in the manufacture of packaging for the protection of oxygen-sensitive contents. Also provided are systems and methods for reducing contamination in a product due to oxidation. Also provided are related methods of manufacture and methods of use.

The present application belongs to the technical field of active packaging film, and particularly relates to a controlled-release antibacterial packaging film and a preparation method thereof. The controlled-release antibacterial packaging film comprises the following components in parts by weight: 0.026-4.05 parts of composite nanoparticles, 0.52-10.51 parts of essential oil, 16.89-19.57 parts of plasticizer, 1.35-1.57 parts of auxiliary crosslinking agent, and 67.57-78.31 parts of film-forming base material. The composite nanoparticles are used to stably coat the essential oil droplets to form a stable coated dispersion system. The composite nanoparticles comprise zein and carboxylated cellulose nanowhiskers. The present application uses the method of stably coating essential oil with composite nanoparticles to prepare an essential oil emulsion, which is then added to a film to obtain an antibacterial active packaging film. The release rate of the essential oil is adjusted by adjusting the formula of the composite nanoparticles, so that the essential oil is slowly and continuously released, and the action time of the essential oil is prolonged.

The application provides an egg white protein-based antioxidant composite coating as well as a preparation method and application thereof, and belongs to the technical field of food active packaging. The preparation method comprises the following steps: preparing an egg white protein solution, encapsulating resveratrol Res by a pH driving method, preparing a composite coating liquid, and preparing an antioxidant composite coating. The application adopts a composite coating form in which egg white protein is compounded with pullulan to improve the mechanical performance of the coating, and combines the pH driving method to efficiently deliver resveratrol to improve the antioxidant performance of the coating, so as to ensure the green edible property and the antioxidant property of the coating. The obtained composite coating has an encapsulation rate of Res of greater than or equal to 66%, and a DPPH free radical scavenging rate of greater than or equal to 50%.

The application relates to an active packaging film and a preparation method and application thereof, and the preparation method is as follows: preparing essential oil@polydopamine capsules by self-polymerization oxidation under alkaline conditions; preparing a soybean protein isolate solution; preparing a carboxymethyl cellulose solution; blending and configuring essential oil@polydopamine capsules, the soybean protein isolate solution, the carboxymethyl cellulose solution and a plasticizer into a film-forming solution, performing vacuum degassing, adopting a solution casting method to form a film, demolding after drying, and obtaining the active packaging film. Compared with the prior art, the preparation method adopted by the application is simple in operation, non-toxic and harmless, low in cost, the polydopamine capsules are covalently combined with the soybean protein isolate and the carboxymethyl cellulose to form a cross-linking network structure such as a phenolic amine, and the prepared active packaging film has good mechanical properties, antioxidant properties, antibacterial properties and degradability, and has potential application value in the field of food packaging and preservation.

The present invention relates to a method (100) for obtaining multifunctional alginate-based packaging films that are sensitive to pH changes in the environment, have barrier properties against UV and

This invention provides a composite film, its preparation method, and its application, relating to the field of polymer composite packaging materials technology. The raw materials for the composite film include modified nanocellulose and polyphenol extract in a mass ratio of 2-18:1. The modified nanocellulose is obtained by oxidative modification and nano-sizing of cellulose, and its surface carboxyl group content is 0.5-1.8 mmol / g. This invention improves the tensile strength of the composite film and also exhibits inhibitory effects on common foodborne pathogens (Escherichia coli, Staphylococcus aureus), possessing antibacterial and antioxidant capabilities. Furthermore, it simultaneously achieves high optical transparency, high active ingredient loading, efficient UV shielding, and low migration, making it particularly suitable for food active packaging with high requirements for visual appearance and safety, and easy for industrial production.

The invention discloses a bean dreg cellulose antibacterial film based on deep-eutectic solvent extraction and a preparation method of the bean dreg cellulose antibacterial film, and relates to the field of high-value cyclic utilization of food byproducts and active packaging materials. A specific deep eutectic solvent (choline chloride-lactic acid) system is adopted, a complex hydrogen bond network among protein, fat and cellulose in the bean dregs can be effectively destroyed in one step, high-selectivity removal of impurities is achieved, the holocellulose content of the bean dregs is remarkably increased to 75% from 52% of the raw material, and through simple post-treatment of the tannic acid solution, the content of holocellulose in the bean dregs is greatly increased. Natural antibacterial components are successfully introduced into a cellulose network, the film is endowed with a remarkable antibacterial function, the film shows excellent film-forming property, light transmittance and thermal stability, and a basis is provided for application of the film in the field of packaging. According to the preparation process disclosed by the invention, the use of a large amount of traditional high-pollution acid and alkali is avoided, the process conditions are mild, the energy consumption is relatively low, the main raw materials are derived from food byproducts, and the requirements of green chemistry and sustainable development are met.

This invention discloses a corn protein-based composite film for synergistic degradation of ethylene and antibacterial effects, and its preparation method, belonging to the field of food active packaging materials and fruit and vegetable preservation technology. The composite film comprises zein, quercetin, and the plasticizer glycerol. The quercetin content is 0.5%–3% of the zein content, and the film is obtained by casting. The quercetin is uniformly dispersed in the zein matrix. The preparation method is as follows: zein is dissolved in an 80%–95% ethanol aqueous solution, and glycerol is added and mixed. Quercetin is dissolved in anhydrous ethanol and stirred in the dark. The two are mixed to obtain a film-forming solution, which is poured into a mold and dried at 20–30°C and 50%–80% relative humidity for 24–48 hours before the film is removed. This invention utilizes the adsorption and enrichment of ethylene by zein, and the photocatalytic effect of visible light-excited reactive oxygen species generated by quercetin synergistically achieves efficient ethylene degradation. Simultaneously, the reactive oxygen species generated by this photocatalysis achieve an antibacterial effect, combining the advantages of natural raw materials, simple preparation, and ease of large-scale production.

The invention provides a food source-based active coating for preventing dry consumption under an ultralow temperature condition and a preparation method thereof, and belongs to the technical field of food active packaging. According to the invention, through the combination of the two coatings, the inner antioxidant inhibits free radical oxidation generated by freezing, and the outer high-barrier structure effectively locks water and blocks the synergistic effect of external oxygen permeation, the freezing and fresh-keeping effect of food is significantly improved, the used raw materials are natural and safe, the preparation method is reasonable, and good practical application value is achieved. The problem that in the prior art, an edible freezing protection coating suitable for an extremely cold environment is poor in effect is solved.

The application discloses an ultrasonic preparation method and application of a polysaccharide fruit and vegetable fresh-keeping film loaded with nano essential oil emulsion, and relates to the technical field of food active packaging material preparation. The application takes pullulan as a matrix, and prepares a fruit and vegetable fresh-keeping film by loading soybean protein isolate / turmeric essential oil nano-emulsion and soybean protein isolate / orange essential oil nano-emulsion prepared by ultrasonic regulation control, and studies the mechanical properties, barrier properties, structural characteristics and antibacterial activity of the emulsion prepared by ultrasonic compared with the emulsion prepared without ultrasonic. Meanwhile, the application takes strawberries as a research object, studies the influence of the fresh-keeping film on the fruit fresh-keeping effect, and can meet the requirements of food active packaging, is beneficial to the development of green and environment-friendly food packaging materials, and has a potential application prospect.

The invention discloses a caffeic acid carbon dot / pullulan-chitosan nano composite film for fresh keeping of fresh poultry meat and a preparation method of the caffeic acid carbon dot / pullulan-chitosan nano composite film, and belongs to the technical field of food packaging materials. According to the invention, pullulan and chitosan are used as a composite matrix, and caffeic acid derived carbon dots are used as a nano functional filler to be compounded to form the film. According to the invention, natural caffeic acid is converted into nano carbon dots, and the nano carbon dots are uniformly dispersed in a polysaccharide matrix, so that the problems of easy migration and single function of active components in a traditional active package are solved. The obtained nano composite film not only has high mechanical strength and good moisture resistance, but also has excellent and lasting antioxidant and antibacterial activity. When being applied to packaging of fresh meat products, the preservative can effectively inhibit microbial growth and fat oxidation, significantly delay spoilage and prolong shelf life. The invention provides a new strategy for developing high-performance and environment-friendly active food packaging materials.

The application relates to a packaging antenna based on a three-dimensional stacking technology and an antenna array, belongs to the technical field of packaging antennas, and solves the problem that existing antenna processes are difficult to realize integrated packaging; the application forms an electrical connection channel between three layers of rewiring layers through metal columns and feed lines, enables an active device to receive and send radio frequency signals in an electrical connection mode, limits the interval height of the rewiring layers to be within 50 microns, meets the packaging requirements of the three-dimensional stacking technology, feeds signals to antenna radiation patches in a coupling feeding mode through microstrip feed lines, does not need electrical connection, reduces space occupation, can increase the antenna bandwidth in a manner of stacking multiple radiation patches, further optimizes the antenna performance, fully utilizes the space size of the overall active packaging, integrates the antenna and the active device, reduces the packaging cost, realizes low-cost design of the packaging antenna, and has good application prospect and economic value.

The application belongs to the field of cowpea preservative, and particularly relates to a modified cowpea porous starch adsorbing rutin composite film and application thereof. Cowpea starch is used as raw material to prepare porous starch (PS) through composite enzymolysis, and octenyl succinic anhydride (OSA) is used to modify the hydrophobicity of the porous starch, so as to obtain OSA-PS with amphiphilic structure. Then, the porous structure and hydrophobic sites of OSA-PS are used to realize efficient adsorption and loading of rutin (RUT), so as to obtain OSA-PS-RUT composite particles (OPR), and the OPR is introduced into a gelatin / sodium alginate (GS) film base system to prepare OPR / GS active composite films with different addition amounts. The film can realize stable maintenance of cowpea storage quality through synergistic effect of multiple ways such as bacteriostasis, antioxidant, water loss reduction and construction of suitable gas microenvironment, and provides experimental basis and theoretical support for application of natural degradable active packaging materials in the field of fruit and vegetable preservation.