1262results about How to "Good fresh-keeping effect" patented technology

The invention discloses a safety and efficient compound food preservative which comprises a first preservative, a second preservative, a third preservative, an acidity regulator, a stabilizer, an emulsifier, a flavoring agent and an anti-caking agent. The safety and efficient compound food preservative can damage microbial cell walls, change permeability of cell membrane, and prevent schizogamy of microbial cell walls, has high inhibitory effect to specific bacteria, yeast, spoilage bacteria, bacillus and the like, can prolong shelf life of products effectively, and can at least double preservation time comparing with conventional preservatives.

The invention discloses a method and a system for preparing restaurant-kitchen wastes into a livestock and poultry feed, wherein the method comprises the following steps: carrying out sorting preprocessing on restaurant-kitchen wastes so as to obtain biodegradable restaurant-kitchen wastes; carrying out solid-liquid separation on the obtained biodegradable restaurant-kitchen wastes; adding bran, corn flour and coarse meal into the obtained product so as to obtain a mixed material; adding composite fungicides into the mixed material according to the inoculum concentration (8-20 wt%) so as to ferment the mixed material; and finally, drying and cooling the fermented mixture, then packing the obtained object so as to obtain a livestock and poultry feed product. The system comprises a feed device, a wet sorting machine, a pressafiner, an agitated mixer, a fermentation tank, a low-temperature drying machine, a crusher and a finished product material storage tank which are sequentially connected; and the system has the advantages that the growth of putrefying bacterias and the reproduction of pathogenic microorganisms in restaurant-kitchen wastes can be inhibited, and the freshness retaining effect and organoleptic quality of the livestock and poultry feed are good; meanwhile, the protein content of the livestock and poultry feed can be improved; in addition, the system is low in used equipment cost, small in energy consumption, high in production efficiency and beneficial to environmental protection.

The invention relates to an orange antistaling agent and is characterized in that the orange antistaling agent is made from components according to the following proportion relationship: 0.2-0.8g of a bactericide; 0.1-0.3g of p-chlorophenoxyacetic acid; 0.001-0.002 L of acetone; 2-5g of Tween 20; 10-20g of chitosan; and 1L of water. The orange antistaling agent provided by the invention can be used to effectively prevent oranges from being rotten during the storage period, prolong the shelf-life of oranges and raise the orange quality. In the meanwhile, the invention also provides a preparation method of the orange antistaling agent and a method for using and processing the orange antistaling agent.

The invention relates to the technical field of food refreshment, and provides a fresh food distribution terminal refreshment system and a work method thereof. A refreshment scheme of a fresh food distribution terminal, the refreshment system of the refreshment scheme and the work method of the refreshment system are provided. According to the refreshment scheme of fresh food, the fresh food involved in fresh food distribution business is classified according to appropriate storage conditions, and for each type of fresh food, the best storage condition is arranged by integrating refreshment modes of lower temperature, low pressure, air regulation and sterilization. The fresh food distribution terminal refreshment system achieving the refreshment scheme comprises a storage system, a man-machine interactive system, a cooling system, an air regulating and controlling system, a sterilizing system and a control system, the fresh food distribution terminal refreshment system can conduct accurate refreshment on the fresh food in the preset work method according to the refreshment scheme, and safety and freshness of the fresh food at the distribution terminal are guaranteed. Meanwhile, the fresh food distribution terminal refreshment system is convenient to operate. The fresh food distribution terminal refreshment system can prompt ordering of the fresh food and development of the distribution business.

The invention discloses a long-acting preservative for quince. The long-acting preservative is prepared by mixing gibberellin, ridomil, 2,4-D sodium salt, thiophanate, citric acid, polychlorinated benzoic acid and water. The invention has reasonable prescription, good preservation effect, long preservation time and low production cost. When in use, fruits are put in the preservative for 2 to 3 minutes.

The invention discloses a quince preservative which is prepared by mixing cellulose, thiophanate methyl, carbendazim, p-hydroxybenzoic acid, vitamin C, maleic hydrazide and water. The invention has reasonable prescription, good preservation effect and low production cost. When in use, fruits are put in the preservative for 1 to 2 minutes.

The invention provides a mildew-proof preservative paper and a preparation method and a preparation device thereof. The preparation device comprises a paper-based layer, a decorative coating and a mildew-proof preservative coating, wherein the mildew-proof preservative coating is arranged one surface of the paper-based layer, the decorative coating is arranged on the other surface of the paper-based layer, the mildew-proof preservative coating is made from a mildew-proof preservative coating raw material and is prepared from, by weight, 20%-60% of resin, 30%-70% of solvent, 0.5%-10% of mildew preventive and 0.3%-5% of additive, the resin is at least one of polyurethane resin, acrylic ester copolymer, polyvinyl alcohol, polyvinylidene chloride, modified polyethylene vinylidene chloride, vinyl-vinyl acetate copolymer, polyvinyl acetate copolymer and vinyl acetate-butyl copolymer, and the solvent is at least one of water and ethanol. The surface of the obtained mildew-proof preservative coating is dense and provided with small pores, the mildew-proof preservative coating has the good effect keeping moisture constant, the mildew preventive is dispersed inside resin, mildewing can be also prevented, and further a good preservation effect is reached.

A grain deposit for cold storage of grains features that it is an underground building, and is a composed of blower, wind channel, cold-air blower, refrigerator, refrigerating chamber, air return channel, grains inlet, cold storage, upper and lower conveyers, transition storage, grain deposit and underground space. Its advantages are not ageing grains, high antistaling effect, not mildewing, and high effect on preventing pests and mouse.

The invention discloses a pot cover which comprises a pot cover body, a sterilizing module, a control device and a shielding module, wherein the sterilizing module comprises an ultraviolet LED lamp, and a light guide pillar is arranged at the light emitting side of the ultraviolet LED light. The pot cover has the advantages that the sterilizing effect is good, and the ultraviolet light is long in service life. The invention also discloses a pot which comprises a pot body and the pot cover covering the pot body. The pot has the advantages that the sterilizing effect is good, and the ultraviolet light is long in service life.The invention further discloses a pot additionally provided with a heat preservation module electrically connected with the control device, wherein the control device is arranged on the pot body and / or the pot cover body and is connected with the heat preservation module or a temperature sensor. The pot has the advantages that the sterilizing effect is good, and the ultraviolet light is long in service life. The invention further discloses a preservation method for food in the pot, which comprises the steps: during cooking, a shielding part covers the pot, a light passage is sealed; and after cooking is ended, preset sterilizing temperature is reached, the shielding part is opened, the light passage is opened, the ultraviolet LED light is turned on, and ultraviolet light is transmitted via the light guide pillar and penetrates through the light emitting side of the sterling module to irradiate food in the pot. The method has the advantages that the operation is simple and convenient, the sterilizing effect is good, and the preservation effect is good.

The invention relates to a formula of an aquatic product composite preservative. The formula of the aquatic product composite preservative is characterized in that the aquatic product composite preservative in each liter of distilled water comprises the following components: 0.4 to 0.6 g of muramidase, 2.5 to 3.5 g of tea polyphenol, 16 to 20 g of carboxymethyl chitosan, 10 to 14 g of nisin, 25 to 35 g of potassium sorbate, 17 to 23 g of sodium alginate, 20 to 30 g of lactobacillus, 1.5 to 2.5 g of propolis extracts and 10 to 14 g of spice extracts; and the spice extracting liquid comprises the raw materials: galangal, garlic, onion, cinnamon, clove and rosemary. The aquatic product composite preservative provided by the invention is prepared by compounding biological preservatives, is safe and non-toxic, has simple preparation and application methods, prominent microbial inhibition effect and good preservation effect, can greatly prolong the shelf life of frozen aquatic products, and has important industrial value.

The invention discloses a method for preparing antibacterial edible films. The method includes adding polysaccharide materials and epsilon-polylysine into a stirring ball mill and enabling the polysaccharide materials and the epsilon-polylysine to carry out ball-milling reaction at the temperature of 25-50 DEG C for the reaction time of 5-10min to obtain polysaccharide and epsilon-polylysine compounds; adding water into the polysaccharide and epsilon-polylysine compounds, gelatin and glycerin to prepare film forming liquor; coating the film forming liquor to form the antibacterial edible films. A mass ratio of the polysaccharide materials to the epsilon-polylysine is 5:0.8-2.2. The method has the advantages that other solvents can be omitted in reaction procedures, the reaction time is short, the temperature is low, products have light colors, good film forming effects can be realized, the films obtained by the aid of the method have broad-spectrum antibacterial activity, and the toughness and the oxygen barrier capacity of the edible films can be improved.

The invention relates to a preservative technique for fresh kiwifruit, which comprises technique processes of cold storage disinfection, precooling, bagging, air regulate case vacuum pumping, air distribution, preservation and unhouse packaging. The technique of the invention carries out laboratory study test on the storage of the fresh kiwifruit, the test shows that the kiwifruit can be preserved for more than 200 days with average fruit firmness more than or equal to 3.0kg / cm<2>, fruit firmness rate more than or equal to 90 percent, commercial fruits rate more than or equal to 95 percent, Vc keeping-rate more than or equal to 80 percent and freshness index more than or equal to 0.90. Pilot scale study was carried out in an air conditioned storehouse in Zhouzhi County Shanxi Province in 2006 by the technique of the invention to store 50 tons of Hayward kiwifruit for 215 days with commercial fruits rate of 96 percent. The invention has the advantages of simple operation, long preservation period, good preservation effect, no environmental pollution, obvious economic benefit, etc., which can be widely applied.

The invention discloses a pot lip which comprises a pot lip body, a sterilizing module, a control device and a distance measuring device, wherein the sterilizing module comprises an ultraviolet lamp and a first driving device; the control device controls the first driving device to regulate the position of the ultraviolet lamp according to distance information fed back by the distance measuring device; a sterilization effect is good. The invention also discloses a pot which comprises a pot body and the pot lip covering on the pot body; the sterilization effect is good. The invention also discloses a pot; a heat preservation module is additionally arranged; the control device is arranged on the pot body and / or the pot lip body, and is connected with the heat preservation module or a temperature sensor; the sterilization effect is good. The invention also discloses a freshness retaining method for food in the pot. The freshness retaining method comprises the following steps: after food cooking is finished, the first driving device is controlled, by the control device, to regulate the position of the ultraviolet lamp of the sterilization module according to the distance information fed back by the distance measuring device, so as to enable the ultraviolet lamp to keep a preset sterilization distance to the food in the pot; the ultraviolet lamp is controlled by the control device to be turned on, and the food in the pot is irradiated by ultraviolet light emitted from the ultraviolet lamp. The operation is simple and convenient; disinfection and sterilization effects are good; a freshness retaining effect is good.

The present invention discloses one kind of lichi and longan preservative with high preserving effect, no toxicity, no environmental pollution and low cost and suitable for industrial production. The preservative consists of queensland arrowroot powder and bisulfite, pyrosulfite or dithionite capable of releasing SO2 when reacting with water and air. When the preservative is used, it is packed into non-woven polypropylene pocket, the pocket is set inside non-woven polypropylene bag for holding lichi or longan, and the bag is sealed and set into some packing box, with the amount of the preservative being 3.1-8.6 % of the weight of lichi or longan.

The invention discloses a plant essential oil micro-emulsion orange fresh-keeping agent and a preparation method thereof. The method comprises the following steps of: 1, adding 0.1 to 5 weight percent of cinnamon essential oil into 0.3 to 15 weight percent of auxiliary emulsifier, and stirring the mixture uniformly to obtain a micro-emulsion oil phase; and 2, adding 30 to 49 weight percent of emulsifier into the micro-emulsion oil phase, stirring the mixture uniformly, then adding quantitative water into the mixture to obtain plant essential oil micro-emulsion raw solution, and storing the raw solution in a thermostatic water bath or an incubator of 25 DEG C. The plant essential oil micro-emulsion orange fresh-keeping agent has good fresh-keeping effect. Proved by experiments, the fresh-keeping agent with low essential oil concentration can remarkably inhibit spore germination and germ tube elongation of penicillium and sour rot bacteria, has good inhibiting effect on pathogenic bacteria in the orange storage process, and can obviously improve the good fruit rate in the orange storage process. The preparation method has simple process, accords with the fresh-keeping development direction of the current fruits and vegetables, and has good development and application potential.

The invention provides a sterilization and deodorization device for a refrigerator and the refrigerator. The sterilization and deodorization device comprises a housing, a sterilization module and a deodorization filtration module filled with sepiolite, wherein an air inlet and an air outlet are formed in the housing, an airflow channel communicated with the air inlet and the air outlet are defined in the housing, the sterilization module is arranged in the airflow channel and used for sterilizing air flowing through the airflow channel at least, and the deodorization filtration module is arranged in the downstream airflow channel of the sterilization module and used for deodorizing the air flowing through the airflow channel at least. The sterilization and deodorization device conducts sterilization and deodorization on the air flowing through the airflow channel through the sterilization module arranged in the airflow channel and the deodorization filtration module filled with sepiolite and arranged in the airflow channel and accordingly conducts sterilization and deodorization on the air in the outside environment of the sterilization and deodorization device indirectly.

The invention provides a method for processing ready-to-use edible fungi. The method comprises the steps of enzyme deactivating, precooking, dewatering, packaging and sterilizing, wherein the enzyme deactivating means processing fresh edible fungi for 5 to 20 minutes by using enzyme deactivating aqueous solution at the temperature of between 95 and 100 DEG C; and the precooking means processing the edible fungi for 8 to 15 minutes by using precooking aqueous solution at the temperature of between 95 and 100 DEG C. An edible fungus product processed by the method of the invention not only maintains the original nutritive materials of the edible fungi and the edible function and the appearance characteristics of plant dietary fibers but also endows the product with good color, smell and taste, and has the characteristics of low oil content, no oily mouthfeel, ready-to-use performance and the like; and the edible fungi which have strong seasonal characteristics, difficult fresh preservation, unique flavor, comprehensive nutrient and strong heath care functions can be processed into new modern and convenient edible fungus products with the unique flavor.

The invention relates to a fresh tealeaf modified atmosphere freshness retaining cabinet which comprises a cuboid cabinet body. An opening is formed in the front side of the cuboid cabinet body. An opening door is hinged to the front side of the cabinet body in a sealing mode. Three parallel partitioning plates are fixedly arranged in the cabinet body horizontally at intervals up and down. The partitioning plates divide the cabinet body into four independent spaces. The three upper spaces are independent temperature spaces, and the bottom independent space is a temperature, humidity, gas and mould proof performance multifunctional adjusting box. Control displaying panels are arranged in the corresponding partitioning plates on the upper portions of the temperature spaces. A tealeaf organic glass box for tealeaf temperature, humidity, gas and mould proof performance adjusting and controlling is arranged on the corresponding partitioning plate in each independent temperature space. The fresh tealeaf freshness retaining cabinet is provided with three relatively-independent tealeaf placing boxes, the three spaces have different storing temperatures respectively, three tealeaf freshness retaining conditions for different temperature requirements can be provided, freshness retaining pertinence is high, and freshness retaining effect is good.

The invention provides a grafting method of an ornamental elm. Scion used in the operation process is treated by 2% cross-linked chitosan solution before storage, so that the fresh-keeping effect of the scion is improved and the stored scion has higher activity; when a rootstock is cut, the section of the rootstock is formed a 15-degree angle with limb, so that the separation of cortex and xylem is more favorable, and the grating efficiency is increased; when the scion is cut, two faces are long cutting faces, so that the contact area between the rootstock and a scion forming layer is increased, and the combination of the rootstock and the scion is more firm; moreover, since the grating method provided by the invention is fast in speed and high in efficiency, the water loss of the rootstock and the scion is less, and the oxidation and browning degree of the incision is low, so the survival rate of the graft can be greatly improved, and the survival rate of the graft is above 95%. The grating method of the ornamental elm provided by the invention is simple and easy to carry out; the ornamental elm grafted by the method can grow fast and shape rapidly, the crown size in the current year can reach above 1.2 m; the ornamental elm can be transplanted in the same year for grafting, thus, the grafting method is a garden and horticultural technique with stronger practicability.

The invention provides a litchi preservative which is composed of the following components in parts by mass: 2-3 parts of lignin, 2-3 parts of sucrose ester, 0.8-1.2 parts of sodium sorbate, 0.2-0.4 part of calcium chloride, 0.1-0.15 part of calcium stearate, 0.02-0.03 part of sodium tartrate, 0.008-0.012 part of sodium alginate and 200-210 parts of water. The invention also provides a preparation method of the litchi preservative, which comprises the following steps: mixing the sucrose ester, sodium sorbate, sodium alginate, calcium chloride, calcium stearate and water according to the formula, stirring for 20-25 minutes, heating to 50-55 DEG C, adding the lignin and sodium tartrate according to the formula, stirring for 10-15 minutes and cooling to room temperature. The litchi preservative has the advantages of simple preparation method, reasonable formula, low cost and favorable preservation effect, is convenient to operate, and can prolong the litchi preservation period by 22-30 days.

The invention discloses a moisturizing refrigerator and a moisturizing control method thereof. The moisturizing refrigerator comprises a refrigerating chamber in which a moisturizing buffer space for generating condensate water is arranged; and an air guiding device and a moistening device are also arranged in the refrigerating chamber, wherein the air guiding device is used for guiding air in the refrigerating chamber into the moisturizing buffer space, and the moistening device is used for moistening the refrigerating chamber by utilizing the condensate water generated in the moisturizing buffer space. Because the water vapor circulation in the refrigerating chamber is enhanced, the humidity in the refrigerating chamber can be effectively increased and kept at 80%-90%, andthe refreshing effect of the refrigerating chamber is obviously improved.

Disclosed are a refrigerator and a food preservation method thereof. The refrigerator comprises a storage chamber and a gas storage tank; the gas storage tank is applicable to storing compressed gas of low oxygen concentration; the gas storage tank is used for charging the low oxygen concentration gas into the storage chamber. The low oxygen concentration gas helping store foods for a longer period of time is charged into the storage chamber of the refrigerator; required parts are simple, cost is low, low oxygen environment can be quickly provided for the storage chamber by the gas storage tank, and the requirement for food preservation is met.

The invention relates to antistaling agents for fresh kiwi fruit slices, fresh-keeping products and a fresh-keeping method, wherein the antistaling agents comprise a cleaning agent and a color-protection agent; the fresh-keeping products contain a cleaning agent, a color-protection agent, N2 and polyethylene fresh-keeping bags; and the fresh-keeping method, which comprises steps of selection of kiwi fruits, fresh slice cut pretreatment, cleaning treatment, color-protection treatment and N2-charging fresh-keeping treatment, maintains the nutrient composition and freshness of the peeled fresh kiwi fruit slices within a certain amount of time.

The invention discloses a storage and fresh-keeping comprehensive treatment method for Huangguan pears. The comprehensive treatment method comprises seven steps of harvesting in the optimum period, calcium supplementing treatment, film coating treatment, 1-methylcycloproene treatment, packaging, pre-cooling and refrigerating; and the method comprises the steps of pre-cooling in the harvesting period and after the harvesting period as well as other treatment steps, all the steps are interlocked and indispensable, and the method has a good fresh-keeping effect. The method disclosed by the invention can effectively control the phenomena that the Huangguan pears are softened, wilted and decayed, and have superficial browning spots and thinned flavors, and the like in the process of storage, thereby facilitating the original flavor and quality of fruits.

The invention discloses an antiseptic and fresh keeping method for oranges. The method is characterized in that orange fruit is subjected to hot water spraying treatment on the basis of clean water soaking cleaning, then, the orange fruit is soaked into chitosan compound solution containing essential oil for carrying out film coating treatment, next, the orange fruit is packed by a fresh keeping bag containing 1.5 to 2.5 weight percent of nanometer titanium dioxide and 0.8 to 1.2 weight percent of inorganic nanometer antibacterial agents, and the hot water spraying treatment has the conditions that the water temperature is 60 to 65 DEG C, the height from the fruit surface is 0.4 to 0.6meter, the water pressure is 1.5 to 2.0 atmospheric pressure, and the spraying time is 15 to 20 seconds; and the addition quantity of essential oil is 1.8 to 2.2ml / L, volatile essential oil in the essential oil accounts for 50 to 60 percent, and the orange essential oil accounts for 50 to 40 percent. Themethod has the advantages that the hardness, the soluble solids, the titratable acid and the vitamin C content of the orange fruit can be effectively maintained, and the weight loss ratio ascending and the fungus decay occurrence after the orange picking are inhibited, so the preservation period is effectively prolonged.

The invention relates to a household intelligent fruit and vegetable storage and fresh-keeping device. The household intelligent fruit and vegetable storage and fresh-keeping device implement intelligent storage and fresh keeping by combining three basic processes of acceleration of ripening, fresh keeping and decay suppression according to the characteristics of stored fruits and vegetables, and the switch of the basic processes and the adjustment of temperatures, humidity and ozone content of the basic processes are completed by an automatic control system according to varietal characteristics and jump characteristics in botany of the stored fruits and vegetables. The switch of the basic processes is determined by detecting characteristic gases released from the fruits and vegetables. The whole process does not need human intervention, and the current states of the fruits and vegetables are fed back by a man-machine interactive system. The household intelligent fruit and vegetable storage and fresh-keeping device can distinguish green mature, red mature and decay of the stored fruits and vegetables, can help a user to improve the edible quality of the fruits and vegetables, and has the advantages of being low energy consumption, good effect, no pollution and convenience in operation when being used for storing and keeping fresh of the fruits and vegetables, thus being especially suitable for home use.

A special strawberry transportation box with the refrigeration function comprises a box cover and a containing box body. The containing box body is covered with the box cover. The containing box body comprises a box body shell, a lining containing case and a bottom ice case. The lining containing case and the bottom ice case are arranged in the box body shell. The bottom ice case is arranged at the bottom of the lining containing case. A cold air inlet is formed in the bottom of the lining containing case. A middle separation board is arranged in the lining containing case and is hollow. An ice adding opening is formed in the upper portion of the middle separation board. Cold air outlets are formed in the two sides of the middle separation board. The left side and the right side of the lining containing case are provided with a left extension board and a right extension board respectively. A left ice holding cavity is formed by the left extension board, the left side wall of the lining containing case and the box body shell and a right ice holding cavity is formed by the right extension board, the right side wall of the lining containing case and the box body shell. The invention further provides a use method of the special strawberry transportation box with the refrigeration function. The method comprises the specific steps of adding refrigeration ice, placing strawberries, sealing the box cover and the like. According to the special strawberry transportation box with the refrigeration function and the use method of the special strawberry transportation box with the refrigeration function, the fresh preservation effect is good and refrigeration-type long-distance transportation of the strawberries is facilitated.

The invention discloses an intelligent humidity regulating fruit and vegetable box of a high-humidity refrigerator. The intelligent humidity regulating fruit and vegetable box comprises a box. An upper cover plate is arranged on the top of the box, a plurality of moisture-permeable through holes are formed in the upper cover plate, and an automatic humidity regulating functional material block is arranged on the upper surface of the upper cover plate and is positioned at the moisture-permeable through holes; a humidity regulating box covers the automatic humidity regulating functional material block, and the bottom of the humidity regulating box is connected onto the upper cover plate; an automatic regulating door is hinged to the humidity regulating box; the middle of the side, which faces the automatic regulating door, of the automatic humidity regulating functional material block is protruded to form an ejecting protrusion, a gap is reserved between the ejecting protrusion and the automatic regulating door, and a gap is reserved between the top surface of the automatic humidity regulating functional material block and the top of the humidity regulating box. The intelligent humidity regulating fruit and vegetable box has the advantages that moisture of the fruit and vegetable box can be sucked or released by the aid of moisture absorption and swelling characteristics of the automatic humidity regulating functional material block, manual operation can be omitted in humidity regulating procedures, extra energy also can be omitted, the high internal humidity of the fruit and vegetable box can be timely and effectively maintained, condensed water generated in the fruit and vegetable box can be reduced, and the fresh-keeping capacity of the fruit and vegetable box can be greatly improved.

The invention discloses a citrus fruit natural composite antistaling agent comprising the following ingredients by mass percent: 1-2.5 percent of film-forming agent, 1-3 percent of glycerol, 0.02-0.05 percent of emulsifier, 1.5-3 percent of acetic acid, 0.1-0.3 percent of preservative and balance of water, wherein the preservative is one of cinnamon oil and caryophyllus oil or the mixture of the cinnamon oil and caryophyllus oil. The citrus fruit natural composite antistaling agent can keep the citrus fruit fresh while ensuring food safety, playing good preservation effect and ensuring food safety; the citrus fruit refreshed by the antistaling agent, even the Shatang mandarin hardest in preservation, is low in rotting rate and has good fruit rate more than 93 percent in 30-day storage andtransportation process; and the a citrus fruit natural composite antistaling agent can greatly prolong the storage period of the citrus fruit and ensure the quality of the citrus fruit.

The invention relates to a refrigeration and freezing device and a drawer assembly thereof. The drawer assembly comprises a barrel body with the front side opened, a drawer capable of being inserted into the barrel body in a front-and-back push-and-pull manner and an electric control lock mechanism. The electric control lock mechanism is configured to be controllably switched to a locking state so as to lock the drawer to the barrel body or switched to an unlocking state so as to relieve locking on the drawer when the drawer is completely pushed into the barrel body. The electric control lock mechanism is provided with an unlocking button protruding and extending downwards, and the unlocking button is configured to be capable of enabling the electric control lock mechanism to be switched to the unlocking state from the locking state when pressed upwards. According to the refrigeration and freezing device and the drawer assembly thereof, the drawer and the barrel body can achieve automatic locking and unlocking, user operation is facilitated, and the drawer can still be unlocked when the electric control lock mechanism is powered off or breaks down.