20results about How to "Good fresh-keeping effect" patented technology

The invention belongs to the technical field of biological bacteriostasis and food packaging materials, and particularly relates to a carboxymethyl chitosan-covalent organic framework-nano-silver composite material and a preparation method and application thereof. According to the preparation method of the carboxymethyl chitosan-covalent organic framework-nano-silver composite material, provided by the invention, a metagen is adopted as a reducing agent, and AgNPs is synthesized through a biological method; the COF-AgNPs composite material is prepared by an in-situ growth method, and the ordered porous structure of the COF provides specific constraint for the AgNPs, so that aggregation of the AgNPs is effectively avoided; in addition, COF-AgNPs is added into a CMCS matrix, so that the film-forming ability of the COF-AgNPs is enhanced, and the CMCS matrix is endowed with excellent antibacterial performance and mechanical performance. Therefore, the composite film material prepared by adopting the preparation process can effectively improve the fresh-keeping effect of fruits and vegetables, and has a good application prospect in the field of packaging film materials for fruit and vegetable fresh-keeping.

The invention provides an oat dextran-phenolic acid grafted copolymer, a preparation method thereof and application of the oat dextran-phenolic acid grafted copolymer as an antioxidant antibacterial liquid, and belongs to the technical field of food preservation, phenolic acid and oat dextran are mainly used as reaction substrates, the oat dextran-phenolic acid grafted copolymer is prepared through an N, N '-carbonyldiimidazole method under the assistance of vacuum ultrasound, and the oat dextran-phenolic acid grafted copolymer is used as an antioxidant antibacterial liquid. The synthesis process is simple, the synthesis time can be effectively shortened through vacuum ultrasound, the synthesis efficiency is improved, meanwhile, the oat glucan-phenolic acid grafted copolymer prepared through the N, N '-carbonyldiimidazole method has good antioxidant and antibacterial activity, the shelf life of chilled fresh meat can be effectively prolonged when the oat glucan-phenolic acid grafted copolymer is used for preserving the chilled fresh meat, and the service life of the chilled fresh meat is prolonged. The nutritional ingredients are reserved.

This invention relates to the field of food preservation technology and discloses a liquid preservative for preserving fresh walnut kernels. The preservative comprises a natural preservative, a solubilizing and stabilizing agent, and a solvent. This liquid preservative uses natural phloretin as the preservative component, combined with Tween 80 as a solubilizing and stabilizing agent and ethanol as a solvent. This effectively solves the problems of poor water and oil solubility and inadequate stability of phloretin, allowing it to be stably dispersed in the preservative system and fully exert its antioxidant and antimicrobial effects. Furthermore, the preparation method is simple and easy to implement, and the production process is safe and controllable. It is convenient to use; the preservation of fresh walnut kernels can be achieved through dilution and soaking. The diluted solution can be reused, reducing usage costs. Simultaneously, it can inhibit bacterial growth during the storage of fresh walnut kernels, delay oxidative deterioration, maintain their good appearance and quality, extend shelf life, and meet the market demand for high-quality fresh walnut kernels.

The invention discloses an application of a compound salimusk in bacteriostasis and preservation of strawberries, starting from botryis cinerea which is a main pathogenic bacterium after strawberry fruits are picked, and the bacteriostasis effect of the salimusk on the botryis cinerea is studied. The saxellik belongs to important natural musk, contains terpene and alcohol as main components, and has biological activities such as antibacterial activity, anti-inflammatory activity and anti-oxidation activity. Experiments show that the salimusk can effectively inhibit mycelial growth and spore germination. And the destroying effect of the salimusk on fungal spores is deeply explored by observing the microstructure of the tested strain. The strawberry fresh-keeping agent can effectively delay reduction of weight and hardness and nutrient loss in the strawberry storage process, and is good in fresh-keeping effect. Results show that the salimusk has the potential to replace existing chemical bactericides, and a theoretical basis is provided for development of novel antibacterial preservatives.

This utility model discloses an adjustable fruit and vegetable packaging box, relating to the field of fruit and vegetable packaging box storage technology. It includes a fruit and vegetable packaging box body, a lid, ventilation holes, and a classification and limiting partition. The classification and limiting partition facilitates quick and easy adjustment of the fruit and vegetable box's storage capacity and classifies and limits the placement of fruits and vegetables, improving space utilization. It also facilitates convenient humidity control and further preservation within the box's inner storage area, preventing damage to the fruits and vegetables. The design is convenient to operate, simple in structure, and low in cost.

Transportation fresh-keeping device, including folding support mechanism and fresh-keeping bag.The folding support mechanism includes support column, both ends of which are provided with fixed frame.The fixed frame and support column are assembled to form containing space, and the fresh-keeping bag is arranged in the containing space.The fixed frame is provided with fixed assembly seat on the front surface facing the fresh-keeping bag, and the fresh-keeping bag is provided with fixed assembly part, which is assembled and fixed with the fixed assembly seat.The fixed frame is provided with forklift groove on the back surface away from the fresh-keeping bag.Compared with the prior art, the present application has the following beneficial effects: the fish is preserved by the fresh-keeping bag, and the flowing liquid can be automatically discharged, the fresh-keeping effect is good, and at the same time, the folding support mechanism is used to contain and protect the fresh-keeping bag, the overall structure is light and firm, can be folded and stored, and the occupied space of the device is greatly reduced.The device can be combined, spliced and stacked, the collision between them during stacking is prevented, and the damage rate of the device during transportation is reduced.

The invention relates to the field of processing of sausages, and provides a preparation method of juice-exploded sausages, which solves the defect of poor product quality caused by the defects of the processing method of the sausages in the prior art, and comprises the following preparation steps: (1) preparing raw materials and pickling auxiliary materials; (2) unfreezing the raw material pork, and removing miscellaneous hair, fascia and obvious fat; (3) pickling; (4) stirring and pulping; (5) filling; and (6) twisting, hanging on a rod, cooking and forming, airing, cutting into sections and packaging.

The invention relates to the field of new packaging materials, and provides a composite film for fresh-keeping of green leaf vegetables and a preparation method thereof, the main raw materials of the composite film comprise a base material, citric acid, glacial acetic acid and nicotinamide; wherein the base material is a mixture of chitosan and polyvinyl alcohol; the preparation method comprises the following steps: dissolving and mixing the chitosan and the polyvinyl alcohol, adding a nicotinamide solution, stirring and carrying out ultrasonic treatment to uniformly distribute the components, and finally forming the film by adopting a tape casting process. The composite film can effectively delay oxidation and decay of the green vegetables and remarkably prolong the shelf life of the green vegetables. The composite film has good mechanical properties and flexibility, and is suitable for various fresh-keeping applications. The preparation process is simple, large-scale production is easy, and the material is environment-friendly and biodegradable and has a wide application prospect.

The utility model relates to the technical field of article preservation, in particular to a refrigerator preservation device and a refrigerator. The refrigerator fresh-keeping device comprises a fresh-keeping cabin, a nitrogen making module, a vacuum pump, a first valve and a second valve, the fresh-keeping cabin is provided with an air inlet and an air outlet, the nitrogen making module is provided with a feeding port, a nitrogen outlet, a first oxygen discharging port and a second oxygen discharging port, and a three-way connecting pipe is provided with a first port, a second port and a third port; the nitrogen outlet is communicated with the gas inlet through a first pipeline; the second oxygen outlet is communicated with the first opening through a second pipeline; the second opening is communicated with the air outlet through a third pipeline; the vacuum pump is communicated with the third opening, the first valve is arranged on the second pipeline, and the second valve is arranged on the third pipeline; and one of the first valve and the second valve is opened. By arranging the vacuum pump connected with the nitrogen generation module and the fresh-keeping cabin, oxygen accumulated in the nitrogen generation module is fully discharged, and the fresh-keeping cabin can be vacuumized before and after nitrogen filling, so that the nitrogen utilization rate is high, and the fresh-keeping effect is good.

The present invention discloses a degradable biocomposite film based on protein fiber reinforcement, a preparation method and an application. The degradable biocomposite film based on protein fiber reinforcement claimed in the present invention is prepared from a biodegradable polymer material solution, a protein fiber solution, glycerol and water, wherein the protein fiber solution refers to a protein fiber solution obtained by sequentially subjecting the protein to acid treatment, heat treatment and alkali treatment, and the pH value of the protein fiber solution is 2.0-7.0. A degradable biocomposite film provided by the present invention can effectively avoid a large amount of water loss in food to achieve a better preservation effect; the tensile strength result is not less than 9.0MPa, and the practicality is enhanced; the DPPH free radical scavenging rate is not less than 60%, and the ABTS free radical scavenging rate is not less than 70%. Therefore, the degradable biocomposite film prepared by the present application has a good application effect in terms of anti-oxidation of food.

This utility model relates to the field of quick-freezing and preservation technology, specifically an immersion-type ultra-low temperature quick-freezing device using a recyclable safe liquid cooling fluid. It includes a housing and a foldable shelf located on the outside of the housing. The interior of the housing is divided into upper and lower sections by a partition. A freezing chamber is located in the upper section, and a refrigeration system is located in the lower section. A touchscreen operation panel is located on the upper right side of the outer wall of the housing. A sealing cover hinged to the housing is located above the freezing chamber. A stainless steel material frame is located inside the freezing chamber, and a lifting mechanism is located at the bottom of the material frame. This quick-freezing device employs immersion-type ultra-low temperature liquid quick-freezing entropy reduction technology, uses a recyclable cooling fluid, shortens freezing time, and also has the advantages of low energy consumption, low noise, and suitability for various indoor environments and climates.

The invention discloses a composite preservation method of pineapples. According to the invention, it is found that the preservation effect of film coating treatment of the fruit wax and melatonin mixed solution on pineapples is better than that of single fruit wax film coating or melatonin solution soaking, and maturation and aging of the pineapple fruits are effectively delayed, specifically, color change and hardness reduction of the pineapple fruits are delayed, the water loss rate of the pineapple fruits is reduced, and the respiration of the pineapple fruits is inhibited; the accumulation of MDA, superoxide and active oxygen in the fruits is reduced, the membrane damage of the fruits is reduced, and technical support and theoretical basis are provided for the improvement of post-harvest treatment and storage and transportation technologies of the pineapples.

The utility model discloses an automatic vegetable packaging machine which comprises a machine frame. The feeding frame is movably arranged on one side of the rack; the photoelectric detection device is arranged on one side of the feeding frame; a thin film discharging mechanism is arranged at the bottom of the rack; the bag making device is arranged on one side of the feeding frame and located above the thin film discharging mechanism; the middle sealing mechanism is arranged on one side of the machine frame and used for heating and pressing two overlapped film edges after a packaging bag is formed, and the end sealing mechanism is arranged at the tail end of the machine frame and used for heating, pressing and cutting off the end of the packaging bag. Compared with the prior art, the automatic vegetable packaging machine has the advantages that the functions of automatic vegetable feeding, length detection, packaging, sealing, weighing, labeling and the like can be achieved, the automation degree, the production efficiency and the packaging quality of vegetable packaging are improved, and the increasing requirements for efficient packaging of scenes such as online vegetable selling and the like are met.

The invention relates to the field of health food, in particular to an instant polygonatum and a preparation method thereof. The instant polygonatum is prepared from the following raw materials, measured by weight: 220-250 parts of polygonatum fermentation liquid, 1-5 parts of chitosan, 0.1-1 part of citric acid, 60-80 parts of microcrystalline cellulose, 30-40 parts of starch, 60-80 parts of maltodextrin, 0.1-0.5 parts of sodium trimetaphosphate and an appropriate amount of solvent. The instant polygonatum prepared by the invention is edible for people, can improve human physique, enhance immunity level, increase disease resistance and delay aging.

The temperature and humidity regulation and control device comprises a heat preservation box body and an electric control system, the left portion of the heat preservation box body penetrates through the heat preservation box body, a box door capable of being opened and closed is installed on the left portion of the heat preservation box body, an exhaust pipe penetrating up and down is fixed to the upper left portion of the heat preservation box body, and a three-way pipe is fixed to the upper right portion of the heat preservation box body; a first electric valve for controlling on-off is installed on a through opening in the upper portion of the three-way pipe, a second electric valve for controlling on-off is installed on a through opening in the left portion of the three-way pipe, and a draught fan is installed on a through opening in the bottom of the three-way pipe. Water drops condensed on the surfaces of the pears are separated and gathered through the supporting disc, discharged through the through holes in the wavy bottom and then collected by the water collecting groove, so that contamination of the water drops to other pears is greatly reduced, and infection and damage are reduced; the upper sensor assembly, the electric refrigerating device, the electric heating device and the lower sensor assembly which are arranged on the upper portion and the lower portion of the heat preservation box body respectively are matched with rotation of the draught fan so that the temperature and the humidity in the heat preservation box body can be more uniform.

The utility model relates to the technical field of household appliances, in particular to a refrigerator fresh-keeping device and a refrigerator. A refrigerator fresh-keeping device comprises a vacuum pump, a fresh-keeping cabin, a nitrogen making module, a first pipeline, a second pipeline and a first valve, the fresh-keeping cabin is provided with a gas inlet and a gas outlet, and the nitrogen making module is used for separating nitrogen from oxygen and provided with a feeding port, a nitrogen outlet and an oxygen discharging port; one end of the first pipeline is communicated with the nitrogen outlet, and the other end is communicated with the gas inlet; one end of the second pipeline is communicated with the air outlet, and the other end of the second pipeline is connected with the vacuum pump to vacuumize the fresh-keeping cabin through the vacuum pump; the first valve is arranged on the first pipeline and can respond to the pressure difference between the nitrogen making module and the fresh-keeping cabin to open / close the first pipeline. According to the refrigerator, the vacuum pump is arranged to vacuumize the fresh-keeping cabin, oxygen can be further reduced, meanwhile, the filled nitrogen is completely used for creating a high-nitrogen and low-oxygen environment in the refrigerator, and the utilization rate of the nitrogen is increased.

The application discloses a copper-doped active manganese catalyst, a preparation method thereof and application of the catalyst in fruit preservation, and relates to the field of fruit preservation. The preparation method of the copper-doped active manganese catalyst comprises the following steps: selecting a cheap manganese ore, stirring and dissolving the manganese ore in an ascorbic acid solution, filtering to obtain a low-valence manganese-containing filtrate; adding the low-valence manganese-containing filtrate into a potassium permanganate solution, stirring and reacting at 70-90 DEG C for 12 hours, and filtering to obtain a brown precipitate; preparing a copper sulfate solution with a pH of 4-6, adding the brown precipitate, and stirring and reacting for 12 hours. After the reaction, the mixture is cooled and filtered, and the powder is obtained after drying at 150-160 DEG C; the powder is shaped into particles to obtain the catalyst. Through the doping of copper elements, the catalytic activity of manganese dioxide is significantly enhanced, so that the catalyst can actively and efficiently remove various key factors causing fruit decay and aging; the catalyst is applied to fruit preservation at room temperature, has a long service life, does not directly contact the fruit, and is safe and healthy.

The utility model belongs to the technical field of vacuum pressure switches, and particularly relates to a vacuum pressure switch applied to a refrigerator. The air cover is fixedly installed below the switch base, a containing cavity is formed in the air cover and the switch base, and the diaphragm piece is located in the containing cavity and divides the containing cavity into an upper cavity and a lower cavity. The PCB and the on-off mechanism are located in the upper cavity, a connector is arranged on one side of the PCB, an elastic piece is arranged on the other side of the PCB, and the on-off mechanism is located on the elastic piece side; the jacking mechanism located in the lower cavity conducts jacking or retreating motion due to the change of the pressure intensity in the refrigerator negative pressure fresh-keeping chamber and drives the on-off mechanism to extrude or loosen the elastic piece. Compared with the prior art, the pressure control structure has the beneficial effects that the pressure control structure is modularly designed, so that the assembly and after-sales maintenance and replacement of a product are facilitated, and the production cost is reduced; the pressure change control is realized by the spring, the elastic sheet and the diaphragm sheet, the attenuation is smaller, the control precision of the product is improved, and the service life of the product is prolonged.

The utility model relates to the field of flower cultivation technology especially is a kind of fresh-keeping device for flower cultivation, including water storage tank, the front side fixedly connected with fixed block of water storage tank, the front side fixedly connected with placing rack of fixed block, the top of placing rack is provided with cultivation box, the top of fixed block is provided with bottom plate, the top of bottom plate is provided with spray head, the top fixedly connected with water pump of water storage tank.The utility model has the advantages of good fresh-keeping effect and adjustable spraying range, and in actual use process, the cooperation of water pump, inlet pipe, outlet pipe and spray head can effectively transport water in water storage tank to spray head and spray out, water the flowers in cultivation box, keep the freshness and humidity of flowers, so as to achieve the effect of long-term preservation, by the setting of first drive mechanism, the position of spray head is adjusted, so that spray head can be moved to different positions, and the flowers in each corner are watered.

The invention provides application of an ethylene inhibitor in post-harvest preservation treatment and storage period prolonging of fresh cistanche deserticola. 1-MCP is selected as the ethylene inhibitor. Compared with the prior art, the method has the following advantages: the first research shows that the weight loss ratio and browning degree of fresh cistanche in the storage process of 4 DEG C can be effectively reduced by treating the fresh cistanche with a proper dosage of 1-MCP, and relatively high hardness is maintained, so that relatively good overall appearance is maintained. Meanwhile, the overall quality including sensory quality, physiological quality, effective components, antioxidant activity and flavor of the cistanche deserticola in the low-temperature storage process after the cistanche deserticola is picked is maintained or improved to different extents, and the method is good in preservation effect, low in cost and easy and convenient to operate, provides powerful technical support for universal use of the cistanche deserticola, and has wide application prospects. And more possibilities are provided for modern processing of the cistanche medicinal material and product development based on fresh medicinal materials.