147results about How to "Extended storage period" patented technology

The invention discloses a fresh-keeping method for fruits and vegetables, which comprises the following steps that: (1) selecting fruits and vegetables and encasing in boxes; (2) prestorage: disinfecting the prestorage room and placing in fruit boxes full of fruits and vegetables; when the prestorage begins, turning on an ultrasonic humidifiens and an ozone generator to control the relative humidity of the prestorage room less than 80 percent, the ozone concentration of the prestorage room between 5 and 20mg / m<3>; (3) storing in the storeroom: disinfecting the storeroom and placing in the prestored fruit boxes and at the same time turning on the ultrasonic humidifiens and the ozone generator to control the relative humidity of the storeroom between 80 percent and 98 percent, the ozone concentration of the storeroom between 5 and 20mg / m<3>. The invention combines ultrasonic humidifying with ozone sterilization to carry out humidification and sterilization and antisepsis to the fruits and vegetables, etc., stored in the storeroom; moreover, synchronically preventing fresh fruits and vegetables from wilting and decay, which greatly reduces the decay rate of raw material and keeps the raw material in good state, thus acquiring a longer preservation period.

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 discloses a knapsack type walking high-legged vehicle for roxburgh rose picking, which comprises a knapsack moving mechanism, a shearing and fastening mechanism, a conveying mechanism, arotary screening mechanism and an oscillating and bin-packing mechanism, wherein the shearing and fastening mechanism is arranged on the right side wall of the knapsack moving mechanism, the conveying mechanism is arranged on the left side of the knapsack moving mechanism, the oscillating and bin-packing mechanism is arranged on the knapsack moving mechanism, and the rotary screening mechanism isarranged on the oscillating and bin-packing mechanism. The invention belongs to the technical field of agricultural machinery, and particularly provides the knapsack type walking high-legged vehiclefor roxburgh rose picking which has the advantages of high practicability and comfort, simple operation, convenient movement, high safety coefficient, and nondestructive picking of roxburgh rose. Theknapsack type walking high-legged vehicle for roxburgh rose picking can overcome the problem of difficult picking of roxburgh rose in the middle of a plant, can automatically and nondestructively screen roxburgh rose in real time, and can automatically bin the screened roxburgh rose, so that the storage time of the roxburgh rose is effectively prolonged and the transportation and sales of the roxburgh rose are convenient.

The invention discloses a controlled atmosphere storage process of such fresh Chinese herbal medicines as fresh cordyceps, fresh ginseng and fresh gastrodia elata. The process comprises the following steps: (1) fresh Chinese herbal medicine screening; (2) cleaning and sterilization: the special deep cleaning and ultraviolet sterilization are performed for the fresh Chinese herbal medicines; (3) quantitative detection: the quantitative detection of conventional items is performed for the fresh Chinese herbal medicines; (4) air distribution: a controlled atmosphere distributor is used for preparing a needed controlled atmosphere proportion; (5) air charging: a controlled atmosphere packer is used for charging air; (6) packing: a sealing machine is used for packing the air-charged fresh medicines; (7) sterilization: the ultraviolet sterilization is performed for the fresh Chinese herbal medicines packed in the controlled atmosphere packages; and (8) warehousing: the sterilized packaged products are transported into a refraction house below 0 DEG C for storage. The controlled atmosphere storage process can prolong the storage period of such fresh Chinese herbal medicines as fresh cordyceps, fresh ginseng and fresh gastrodia elata, prevents the fresh Chinese herbal medicines from being moisturized, mildewed and damaged by worms, delays the loss of effective components of the fresh Chinese herbal medicines, and effectively guarantees the quality of the fresh Chinese herbal medicines.

The invention discloses a storing and fresh preserving method for white flammulina velutipes, which pertains to the technical field of storage and fresh preservation of agricultural commodity. The method comprises the steps of: (1) harvesting, finishing and grading of the white flammulina velutipes; (2) preparation of anti-browning inhibitors and the treatment thereof; (3) treatment of low temperature and dryness; (4) vacuum packaging; (5) storage at ice temperature until delivering out of a storehouse and distributing to the market. The white flammulina velutipes stored by the method is characterized by reducing the rotting rate, enzymatic browning and the respiration rate, lengthening the preservation period which reaches 20 to 30 days, keeping the original color, fragrance, taste, shape and nutrition, etc., and reaching a commodity rate over 95 percent. The anti-browning inhibitors are the food additives which are permitted by the country and are safe and reliable. The method of the invention can be widely applied in the fields of production, storage and fresh preservation and operation of the flammulina velutipes.

The Chinese chestnut preserving process includes the following steps: picking chestnut, piling in reasonable mode, threshing and eliminating some water, soaking with pretreating agent, treating with preservative, improved sand preservation or film tent storage, and management in preserving period. To Chinese chestnut with pest, some fumigating step to killing pest in added before threshing and water elimianting step. The said process is simple, practical and suitable for small scale storage without using refrigerating equipment, and can reduce cross infection, increase the disease resistance of Chinese chestnut, reduce water loss during storage and prolong the preserving period of Chinese chestnut.

The invention belongs to the technical field of high polymer materials and preparation thereof, and particularly relates to primer-free polyurethane glass cement. The primer-free polyurethane glass cement comprises the following components in percentage by weight: 19-20% of dioctyl phthalate, 35-40% of polyurethane prepolymer, 17-20% of calcium carbonate, 5.0-6.0% of spherical silica powder, 2.5-3.0% of titanium dioxide, 1.0-5.0% of calcium oxide, 10.0-14.0% of carbon black, 5.0-6.0% of gas-phase silica, 0.03-0.06% of dibutyltin dilaurate and 0.3-0.6% of glycidoxy propyl trimethoxy silane KH560. The primer-free polyurethane glass cement provided by the invention can be adhered in a primer-free manner, thereby being environmental-friendly, economical and solvent-free, and the primer-free polyurethane glass cement has the advantages of high bonding strength, high curing speed, high thixotropy, etc. The primer-free polyurethane glass cement is widely used for adhering and sealing windshield glass and side window glass of railway vehicles, cars and ships with matrix iron plates and aluminum plates.

The invention relates to a food preservative, in particular to a special preservative for processing peaches, which comprises the following components in percentage by weight: 15+ / -1.5% of potassium permanganate, 15+ / -1.5% of alkali metal hydroxides, 6%+ / -1.0% of reducing substances, 3+ / -0.5% of alkali metal oxides, 3+ / -0.3% of cyclopropene or 1-methylcyclopropene, 2.5+ / -0.2% of sodium hypochlorite or sodium chlorate, 2+ / -0.2% of dehydrating agent, 1.5+ / -0.3% of zinc oxide, 1.5+ / -0.15% of ascorbic acid, 0.5+ / -0.05% of sodium polyacrylate, and 50+ / -5% of inorganic carriers. The special preservative for processing peaches achieves the purpose of preservation through adjusting the concentration of oxygen and carbon dioxide, and the preservation period of preserved peaches can not be shortened by the influence of water or steam, and adopted raw materials and components in the formula have the characteristics of safety, broad spectrum, high efficiency, low price and no public nuisance, therefore, the special preservative for processing peaches is suitable for industrialized mass production.

The invention discloses a composite grape fresh-keeping paper and a process for preparation, which belongs to the fruit and vegetable storage and fresh-keeping technique field. The paper is composed of upper, middle and lower layers of base materials with same shapes and sizes, wherein B area of the upper layer is sprayed with citric acid; the middle layer is of polythene plastic film; No. 1 area of the lower layer is glued with all-time releasing fresh-keeping agent, No. 2 area is glued with delayed slow-releasing fresh-keeping agent, No. 3 area is glued with quick-effective fresh-keeping agent. After the paper is unfolded and used, bacterial sources during the initial storage period, the whole storage period and the after-storage period are respectively inhibited by the bacteria inhibitor released by No. 3, No.1 and No.2 areas by stages, which achieves the aim of lengthening the storage and fresh-keeping period and keeping the quality of the grape. The paper of the invention can be widely used by fruits farmers, heavy sale dealers and manufacturing enterprises.

The invention provides a herbicide additive, a herbicidal composition containing the herbicide additive and production equipment. Mineral oil and an assistant are mixed in proportion to obtain the herbicide additive almost having no polarity, and after mixing with herbicide raw drugs, the herbicide additive is not easy to cause decomposition of the herbicide raw drugs, thereby ensuring the weeding effect. At the same time, the added mineral oil also has very strong affinity or solubility to weed leaf wax coat and cellulose, thereby greatly improving the weeding effect. The herbicidal composition provided by the invention has outstanding control effect on eleusine indica, conyza Canadensis and cyperus rotundus three field dominant weed.

The present invention is three-stage pressure-reducing preservation method for long term storage of perishable fruits and vegetable, and belongs to the field of fruits and vegetable preserving technology. The three-stage pressure-reducing preservation method includes: 1) the first fruits and vegetable storing stage of 5-10 days at high vacuum of 5-20 KPa pressure to control water losing rate of 2-3.5 %; 2) the middle stage of 10-30 days in intermediate vacuum of 20-60 KPa pressure to control water losing rate of 1-2 %; and 3) final stage of 10-30 days at low vacuum of 60-100 KPa under humidity of 93-98 % without further water loss, to maintain the fresh state, flavor and post-mature performance. The present invention has long storage term of perishable fruits and vegetable.

The invention discloses an ice temperature combined freshness protection method for modified atmosphere storage of fruits and vegetables, so as to provide a method capable of improving the storage quality of fruits and vegetables and prolonging the refreshing time of fruits and vegetables. The method includes the following steps: performing ultraviolet treatment to harvested fruits and vegetables; performing two-stage cold acclimation for harvested fruits and vegetables placed in a refrigeration house within 12 hours, wherein the temperature of the first-stage cold acclimation for 24 hours is controlled to be within 4.5-5.5 DEG C, and the temperature of the second-stage cold acclimation for 24 hours is controlled to be within minus 0.5-0.5 DEG C; fruits and vegetables subjected to acclimation are placed in a freshness protection bag, tightening the bag opening, placing the bag in an ice-temperature refrigeration house and storing at the temperature of minus 1.2- minus 0.2 DEG C, wherein the thickness of the freshness protection bag is 0.03-0.05 mm. The freshness protection method provided by the invention adopts the ultraviolet treatment, two-stage cold acclimation for adaptation and then packaging through the freshness protection bag for ice-temperature freshness protection in sequence, and keeps the original sensory quality and physicochemical quality of fruits and vegetables and has long storage refreshing time through the combination of the technologies and all technological parameters.

The invention relates to a method for preserving and ripening bananas. The method comprises the following steps: (1), harvesting raw materials which meet the harvest standards; (2), performing pretreatment before preservation by soaking fruits in a pretreatment agent; (3), treating with an edible coating agent; (4), treating the fruits with an ethylene absorbent; (5), packing the fruits with antifogging preservation bags; (6) preserving at an appropriate low temperature; (7), performing preservation-stage management; and (8), ripening before sale. The method provided by the invention prolongs the fresh-keeping period of banana fruit preservation to the greatest extent, greatly improves the commercial quality of bananas by the scientific and reasonable ripening technology, and increases the economic benefits.

The invention discloses a water ploughing system for culturing vegetables and applicant thereof. The water ploughing system comprises a liquid storing system, a nutrient solution circulating system, a planting platform system and a protection system, wherein the liquid storing system mainly comprises a water reservoir, a liquid storing well and an oxygen increasing device; the water reservoir is connected with the liquid storing well by a pipeline; the liquid storing well is arranged under the earth surface; the elevation position of the water reservoir is higher than that of the liquid storing well; the oxygen increasing device comprises a return pipe and an air pressure pump; the nutrient solution circulating system mainly comprises a suction pump, a liquid feeding pipeline and a liquid returning pipeline; the planting platform system comprises a planting groove and a bedstead; the planting groove comprises a groove body and a groove cover; the groove cover and the groove body are movably connected; and the bottom of the groove body has the radian; the protection system mainly comprises a sunshade net, the minimum cover range of which is the planting platform system. The system overcomes the technical problem that the temperature of the nutrient solution in the traditional water ploughing culture is difficult to control, the dissolved oxygen is not enough and the production cost is overhigh; therefore, the system is suitable for the cultivation of various leaf vegetables and can realize the high-quality efficiency production of vegetables.

The invention discloses a fresh-keeping method for storing and transporting vegetables and fruits in an airtight environment and belongs to the field of fresh-keeping process for vegetables and fruits. The method comprises the following steps: collecting raw materials, pre-cooling raw materials, and air-tightly packaging, storing and transporting the raw materials, wherein an oxygen generating agent which is peroxide is added during the air-tightly packaging and storing process. According to the method provided by the invention, the oxygen generating agent is utilized to have chemical reaction with the CO2 (carbon dioxide) in the airtight environment and the evaporated H2O (water) formed by the vegetables and fruits, thereby generating O2 (oxygen), consuming CO2, relatively increasing the O2 concentration and decreasing the CO2 concentration under the airtight condition, and preventing the vegetables and fruits from anaerobic respiration or / and CO2 poisoning, so as to promote the storage, transportation and fresh-keeping effects for vegetables and fruits and prolong the storage, transportation and fresh-keeping period. The fresh-keeping method provided by the invention has the advantages that the operation is simple and feasible, the production cost is low, the practicability is strong and the batch storage and transportation can be realized.

The invention relates to the photovoltaic field, providing silica powder coated with a passivating layer on the surface, in particular providing silica powder with the passivating layer on the surface in the field of production and processing of silicon chips. The invention also relates to a passivation processing method of silica powder. The invention provides silica powder coated with a passivation layer on the surface, wherein the surface of the silica powder is coated with a layer of compact passivating layer which is silicon dioxide. The invention also provides a passivation processing method of silica powder coated with a passivation layer, comprising the following steps: adding strong oxidizing agent into the silica powder; and leading the strong oxidizing agent to react with the surface of the silica powder to generate a compact silicon dioxide layer. In the invention, strong oxidizing agent is added to carry out passivation processing on the silica powder to obtain silica powder coated with a passivation layer on the surface, thus meeting the condition that silica powder can be stored in water or air for a long time, while the oxidation ratio of silica powder is maintained at a lower range, thus greatly improving storage limits of the silica powder and simultaneously improving utilization ratio of silica powder.

The invention discloses a grain storage device convenient to transport. The grain storage device convenient to transport comprises an outer framework and a soft bag, wherein the soft bag is placed inside the outer framework and is fixed on the outer framework; the outer framework comprises transverse beams and longitudinal beams; the top of the soft bag is provided with filling openings used for filling of grains, inflation valves and air exhaust valves; the lower portion of the side face of the soft bag is provided with a grain outlet; each corner of the outer framework is provided with a standard corner piece which is provided with a hanging hole used for hanging; the transverse beams of the bottom of the outer framework are provided with forklift shipment-starting structures; hook and loop fastener strips are arranged on the periphery of the soft bag and the inner side faces of the outer framework; a ladder is arranged on the outer side of the outer framework. The grain storage device convenient to transport has the advantages that the grains are convenient to transport and store, loss of the grains in the transportation process is reduced, and the grains can be stacked to be high to be stored.

The invention relates to an environment-friendly fruit and vegetable cold storage and preservation method, which includes: (1) sterilization treatment; (2) color protection treatment: fruits and vegetables are then precooled in a freezer under 0 DEG C to 5 DEG C for 1 to 3 hours, and are put into a washing basket after being taken out, water which is at 45 DEG C to 50 DEG C is first used for sprinkling for 5 to 10 minutes, water which is at 3 DEG C to 5 DEG C is then used for sprinkling for 5 to 10 minutes, the fruits and the vegetables are taken out and then are immersed for 15 to 20 minutesin water which is at 32 DEG C to 35 DEG C, and finally, the fruits and the vegetables are immersed for 22 to 25 minutes in water which is at 1 DEG C to 5 DEG C; (3) spraying of a preservative; (4) low-temperature storage. The pollution-free greenhouse fruit and vegetable cold storage and preservation method has the advantages of realizing high preservation speed and an excellent melon, fruit and vegetable preservation function, inhibiting the metabolism of the fruits and the vegetables and the breeding and spreading of pathogenic bacteria, delaying the after-ripening and senescence of melons,the fruits and the vegetables, preventing rotting and deterioration, decreasing the browning rate and the rotting rate, and achieving the effects of preservation, peculiar smell elimination, browningresisting, storage time prolongation and outward transportation range broadening.

The invention discloses a method for embedding hydroxytyrosol by taking gelatinized ginkgo starch as a wall material and adopting spray drying technology. The method comprises: taking ginkgoes as a raw material, removing hulls and inner peel, performing ginkgo starch extraction, deproteinization and fat removal, performing gelatinization at a certain condition to prepare gelatinized starch, and performing freeze drying; taking a certain amount of gelatinized ginkgo starch, performing redissolution to prepare a uniform starch gel solution, adding a hydroxytyrosol solution for eddy mixing, performing high-pressure homogenization, and performing spray drying with the air intake temperature being 130-200 DEG C and the air-out temperature being 60-120 DEG C; and packaging the dried gelatinized-ginkgo-starch-embedded hydroxytyrosol powder in a brown or dark sealing bag and waiting for embedding rate determination. According to the preparation method, the defect that the quality of hydroxytyrosol is severely reduced in a storage process of hydroxytyrosol is overcome. The method is simple in treatment process, and the adopted gelatinized ginkgo starch is free of toxic or side effect. Through the sealing shell formed through hydroxytyrosol embedding, the problem of photosensitivity and oxidizability possibility of hydroxytyrosol is solved, and loss of biological components is reduced. The stability of hydroxytyrosol is improved, and the storage period is prolonged.

The invention discloses a multi-item urine test paper box. The multi-item urine test paper box comprises a urine collection box and a test box which are connected in series, wherein an opening is formed in the upper surface of the urine collection box; multi-item urine test paper is mounted in the test box and comprises a urine conveying layer with a water absorption function and a plurality of detection pads, and the urine conveying layer is located below the plurality of detection pads and used for conveying urine to the plurality of detection pads for reaction; a through hole is formed between the urine collection box and the test box, and the urine is transferred to the test box from the urine collection box through the through hole. With adoption of the multi-item urine test paper box, human urine can be collected directly, a process for soaking the detection pads in the urine can be finished automatically, so that the user experience is excellent, and pollution of a urine analyzer is avoided.

The present invention relates to a heterogeneous mixture pouch assembly to seal first and second products in different sections. More specifically, the heterogeneous mixture pouch assembly configuresthe first and second products by dividing regions, and the first and second products are immediately mixed and reacted just during use so that effective skincare components contained in the first andsecond products are prevented from being degenerated and oxidized due to mixing of the first and second products before use by a customer (problems likely to be generated when the first and second products are mixed to be distributed are solved). Since the synergetic effect can be induced to the maximum during usage through fixing, the first and second products are reacted to cause gelation (hardening) or to be swollen or emulsified due to the generation of carbonic acid, moisturization, sedation, and lifting properties effective to the skin are achieved, and a product type to increase skin penetration power can be made.

The invention discloses a granulating-dedicated coarse feed composite mildew inhibitor and a preparation method thereof, especially relates to a dedicated composite mildew inhibitor for making granulated coarse feed and a preparation method thereof, and aims to solve the problem of no a mildew inhibitor product, which is dedicated for coarse feed in the feed market at present. The formula of the composite mildew inhibitor comprises following components: calcium propionate, potassium sorbate, sodium benzoate, dimethyl fumarate, zeolite powder, aflatoxin degrading enzyme, and carriers. The preparation method comprises following steps: first, weighing 4.5 kg of calcium propionate, 5 kg of potassium sorbate, 4.5 kg of sodium benzoate, 6.0 kg of dimethyl fumarate, and 8.0 kg of aflatoxin degrading enzyme; secondly, pre-mixing the components in a small feed mixing machine for 10 minutes, then adding 27.0 kg of zeolite powder and 45.0 kg of corncob powder, putting the mixture into the small feed mixing machine again, and mixing for another 15 minutes so as to obtain the product. The granulating-dedicated coarse feed composite mildew inhibitor has the advantages of no toxicity, no accumulation in animal bodies, and no affection on nutrition value and palatability of coarse feed.

A preservative for fresh cherry fruits is prepared from the following ingredients: 400-600 g of purified water, 8-12 g of corn peptide, 4-6 g of sodium sulfite, 8-12 g of curcumin, 8-12 g of procyanidine, 40-60 g of liquor, 18-22 g of soya lecithin, 4-6 g of watermelon polysaccharide, 8-12 g of benzoic acid, 2-4 g of vitamin E, 3-5 g of a propolis extract, 3-5 g of a peach extract, 3-5 g of a cinnamon extract, 4-6 g of se-enriched yeast, 3-5 g of a capsicum extract and 7-9 g of modified starch. The preservative is simple and feasible, is economic and practical, and is safe and stable. A longer preservation period is provided for normal-temperature transport and sale of cherries for producers and dealers, and edible period is prolonged for consumers. The preservative of the invention has a wide application prospect.

The invention discloses a preservation method capable of simulating vital activity rhythm of cold-sensitive fruits and vegetables to reduce cold damage, and provides a fruit and vegetable preservation and fresh-keeping method with a long preservation time and a good fresh-keeping effect, based on diurnal change laws of natural environment temperature and physiologic growth characteristics of the fruits and vegetables in the growth process of the fruits and vegetables. Particularly, the preservation method comprises the step of preserving the treated and sealed fruits and vegetables in a constant temperature humidity chamber under a temperature rhythm mode. With adoption of the temperature rhythm high-humidity preservation technology, the longer preservation and fresh-keeping time and the better preservation quality can be achieved by physiologically accommodating the fruits and vegetables, inhibiting the respiratory action of the fruits and vegetables, preventing the cold damage, and reducing moisture loss of the fruits and vegetables by keeping high humidity; the fresh-keeping effect is apparently better than the constant temperature preservation mode and the other temperature-variable preservation modes; the preservation method is suitable for various cold-sensitive fruits and vegetables.

The invention provides a fruit and vegetable fresh keeping integrated machine. The fruit and vegetable fresh keeping integrated machine comprises cold chain equipment, an air pipeline, a refrigeratingand cooling device, a heating and warming device, a humidifying and sterilizing device and a computer control system. The invention also provides a fruit and vegetable fresh keeping method. The fruitand vegetable fresh keeping method comprises the following steps of according to requirements of different fruits and vegetables, presetting storage and fresh keeping parameters through the computercontrol system; and according to actual monitoring data, controlling the working condition of the refrigerating and cooling device, the working condition of the heating and warming device and the working condition of the humidifying and sterilizing device, and performing monitoring and controlling on the temperature, the humidity and the ozone concentration in the cold chain equipment in a real-time manner, so that the storage and fresh keeping period of fruits and vegetables is prolonged.

The invention relates to the technical field of ecological restoration, and particularly discloses a turf replanting utilization method and application. According to the method, when turf blocks are stacked and stored after being stripped, the stacking vitality change of the turf blocks is predicted according to the stripping stacking season of the turf blocks, geocells with side holes are adopted as framework supporting materials to slow down vitality attenuation, the turf blocks and the earthwork standard rooms are laid back on slopes along the contour lines at intervals during replanting, the geocells are filled with soil, and plants are sown. According to the method, the stacking duration of the turf blocks can be determined, the activity of the turf in the stacking process can be kept, the laying survival rate can be increased, the geocells can be recycled, the problem that the geocells in high and cold freezing and thawing areas are damaged by freezing and pulling is solved, the interference of livestock grazing on greening sites can be relieved, and the comprehensive effect of turf protection and slope vegetation recovery can be improved.

The invention discloses a storing and fresh keeping method of fresh cut lettuces. The storing and fresh keeping method comprises the following steps of processing raw materials: impregnating processed lettuces in test compound fresh-keeping liquid for 3-9 minutes, wherein the test compound fresh-keeping liquid is prepared from the following components in compounding ratio: 0.01%-0.08%w / v of glucose oxidases, 0.03%-0.12%w / v of ascorbic acid, 0.01%-0.05%w / v of calcium chloride, and 0.03%-0.1%w / v of cysteine; taking out the processed lettuces, drying the taken lettuces at normal atmospheric temperature, and loading the dried lettuces in a fresh-keeping bag; and placing the processed lettuces in environment that the temperature is 0-4 DEG C and the relative humidity is 70%-85%, and performing refrigeration. According to the fresh keeping method disclosed by the invention, the reddish-brown degree of the fresh cut lettuces is greatly reduced, the quality is good, the rotting rate is low, original texture, nutrition and flavor of the fresh cut lettuces can be well maintained, and the storing and fresh keeping period is greatly prolonged. The storing and fresh keeping method is simple and quick to operate, and high in reliability, and the fresh keeping period of the fresh cut lettuces is greatly prolonged.

The invention provides application of potassium persulfate in preparing potassium monopersulfate compound salt and a preparation method of the potassium monopersulfate compound salt. The preparation method of the potassium monopersulfate compound salt comprises the following steps: step a, adding hydrogen peroxide into a reactor, and controlling the temperature to be 2 DEG C below zero to 5 DEG C;dropwise adding oleum into the reactor under the condition of stirring and carrying out thermal insulation for 25 to 35 minutes to obtain peroxide reaction liquid; step b, controlling the temperaturein the reactor to be 18 to 22 DEG C and dropwise adding a solution containing the potassium persulfate into the peroxide reaction liquid; then controlling the temperature to be 23 to 27 DEG C and adding an alkaline potassium compound to obtain neutralized reaction liquid; step c, carrying out cooling crystallization on the neutralized reaction liquid, centrifuging, drying and adding an anticakingagent, thus obtaining a product. The preparation method of the potassium monopersulfate compound salt, disclosed by the invention, has the advantages of simple production process, capability of completing the reaction at normal pressure, no special requirements on the equipment and suitability for large-scale industrial production.

The invention relates to the field of food processing, and specifically relates to an antiseptic color-protecting composition, an antiseptic color-protecting liquid, and a processing and freshness-keeping method of fresh-cut apple fruits. The antiseptic color-protecting composition comprises the following ingredients in parts by weight: 4.0-9.9 parts of vitamin C, 0.08-0.12 part of citric acid, and 0.01-0.03 part of natamycin. By performing freshness-keeping treatment on fresh-cut apple fruits with the antiseptic color-protecting composition provided by the invention, the fresh-cut apple fruits treated with the antiseptic color-protecting composition are significantly improved in appearance, color, luster and taste after storage; moreover, browning of the fresh-cut apple fruits is slowed down, and storage of the fresh-cut apple fruits is prolonged.