1001results about "Fruits/vegetable preservation by irradiation/electric treatment" patented technology

An ultraviolet (UV) light disinfection method and apparatus is provided that disinfects produce products such as fruits and vegetables by direct exposure to ultraviolet light. The disinfecting UV light eliminates pathogens, such as molds and bacteria from the surfaces that it illuminates. The produce product is disinfected over its entire surface. The produce product can be rotated on a conveyor, to illuminate all of the exterior surface of the produce product with a disinfecting UV light source. To better respond to produce products of varying height and size, the UV light disinfection apparatus can include an automatic actuator. The automatic actuator maintains the UV light source at a preselected level of separation between the produce product and the UV light source. The automatic actuator is responsive to a height sensor that detects the top height of the produce product.

The present invention relates to a method for controlling pathogen growth on live plants and mushrooms using UV-C light and an apparatus for use in the method. Also provided are methods for removing surplus leaves and methods for destroying aerial plant parts prior to harvest of underground roots, tubers or bulbs.

This invention relates to a method, process and apparatus for disinfecting and sterilizing all types of surfaces contaminated with microorganisms and toxic substances to render both inactive. Furthermore, this invention relates to both a method and apparatus for disinfecting and/or sterilizing breathable air and then using this air to protect a confined space from external contamination. The apparatus consists of a new ultra-violet (NUV) source that is more effective than mercury based 254 nm light for destroying DNA of virus, bacteria, spores and cists. It is most effective in breaking chemical bonds in toxic gases and Biotoxins that are useful to terrorists. It is combined with other apparatus that remove particulates and byproducts sometimes produced by the NUV source and maintains positive pressure of the confined space so as to prevent the influx of air from outside the protected zone.

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 a method for preparing fruit-and-vegetable or aquatic leisure foods by freeze-drying and subsequent vacuum microwave combination, which belongs to a field of leisure food processing technique. The main process of the invention is that: after handpicking, blanching for extinguishing enzyme or blanching curing, then cooling soaking and quick freezing in a flavor liquid, the fruit and vegetable or aquatic raw material is freeze-dried to reduce the water content to 60-30 percent and then is vacuum-microwave dried to lead the final water content of fruit and vegetable to be less than 5 percent. The invention adopts a novel combined drying technique of freeze-drying before and subsequent vacuum microwave which is carried out by stages. The technique can not only maintain the nutrition and the form of the product in the maximal degree, but also remarkably shorten the drying time, reduce the drying energy consumption, save the cost and can have remarkable expansion effect at the same time, which improves the comprehensive quality of leisure foods.

An apparatus and a method for drying under reduced pressure using microwaves. The apparatus comprises a chamber (13) for housing an object (11), a depressurizing pump (22) connected to the chamber (13) for depressurizing the inside of the chamber (13), a microwave irradiating device (12) for irradiating microwaves to the object (11) in the chamber (13), an airflow generating device for generating an airflow in the chamber (13) by introducing a gas from the outside to the inside of the chamber (13), and a control device (35) for controlling the above components. The object (11) in the chamber (13) is dried at temperatures below a deterioration temperature of the object (11) by intermittent irradiation of the microwaves under reduced pressure while the airflow is generated around the object (11).

The invention belongs to productive technology for preserving and processing fruits and vegetables, mainly comprising the processes of grading selection, cleaning, arranging and splitting, preserving, dewatering and sterilizing, packing and refrigerating and the like. The technology is mainly characterized in that after two times of sterilizing by ozone and ultraviolet rays in sequence, the fruits and vegetables are soaked by an natural edible antistaling agent to form a film so as to carry out atmosphere packaging by mixed gas, thereby maximally maintaining nutritional quality of the fruits and vegetables, improving edible safety of the fruits and vegetables and prolonging sale and preservation period.

A system and method of maintaining the integrity of freshly harvested, or freshly cut fruits and vegetables. Specifically, the invention focuses on a distinct series of processes which confer a lower total microbial count, delay browning, improve general organoleptic properties, and decrease the amount of chemical contaminants on the exposed surfaces without the use of preservatives. Examples of such process may be applying a first produce integrity maintenance process, a second produce integrity maintenance process, application of an antibrowning agent to the produce by a produce antibrown agent applicator, exposing the produce to ultraviolet light by an ultraviolet light system, and applying an ozone treatment by an ozone treatment system.

A method and device are presented for affecting at least one chemical or mechanical property of a target site (109). A stream of liquid towards a contact with the target site (109) is provided with a predetermined flow rate. Also provided is UV-radiation (103) having predetermined parameters in terms of power, wavelength, duty cycle and repetition rate. The UV-radiation (103) is directed within the stream of liquid (101) along a trajectory of the stream. The stream carrying the UV radiation is maintained in contact with the target site for a time period and under conditions sufficient for affecting the at least one chemical or mechanical property.

This invention involves a yam microwave vacuum freeze-drying technology, packing the Yam slices which is quick-frozen in vacuum tank, opening microwave source under the conditions of 75-145Pa of vacuum, temperature -20DEG C-30DEG C, lyophilized under the electric field intensity 140-220V/cm. During the freeze drying, first keep for 2.5-4 in 140-220V/cm and when the materials have been removed with the 80% water, gradually lower the microwave power, and after 1 to 1.5 hours, when the water in the materials interior is below 5%, the freeze-dried process is over. The invention of microwave vacuum freeze-drying method, has advantages such as short drying time, high-quality dry product, and compared with the conventional freeze-dried, and the drying time can be shortened about 50%.

The invention relates to the technical field of agricultural product preservation, and aims to provide a method for refrigerating and preserving juicy peach fruits. The method comprises the following steps of: precooling the juicy peach fruits; radiating the fruits by using ultraviolet rays; cooling gradually; refrigerating the fruits; heating gradually; and delivering the fruits from a warehouse. The cold injury of the juicy peach fruits in refrigeration can be remarkably prevented by treatment of the ultraviolet radiation and gradient temperature change, the rot is reduced, and the refrigeration preservation period of the juicy peach can reach 60 days. The method is convenient and effective to operate, is convenient to popularize and use, and is suitable for large-scale production.

The invention belongs to the technical field of agricultural and sideline product processing, in particular to a processing method of flexible package fresh bamboo shoots, comprising the specific technological processes: sorting, cleaning/tidying, blanching (killing out), cooling, screening, adding preservative, vacuum packaging, sterilizing, cooling and obtaining finished products. Compared with the current processing method in the market, the invention has unique technology and adopts a sulphur-free formula; the prepared flexible package fresh bamboo shoot has the advantages of high quality, high safety, convenient eating, small loss of vitamin C, convenient storage and transportation, long quality guarantee period (12 months for refrigeration, and 6 months for normal temperature) and the like. The flexible package fresh bamboo shoot prepared with the invention improves the economy of bamboo shoots and is suitable for diversifying consumer demand at present.

The invention discloses a color protection preservation method of a poached green leaf vegetable instant product, belonging to the field of fruit/vegetable food processing. The method mainly comprises the following steps of: performing pretreatment, blanching for enzyme deactivation and vacuum infiltration soaking with a color protection and crisp protection agent (sodium alginate, calcium chloride, potato starch and zinc gluconate) of the green leaf vegetable; and performing secondary color protection preservation soaking by use of the color protection preservation liquid consisting of table salt, edible glycerin, sodium carboxymethylcellulose and sucrose ester. The method reduces the color protection preservation cost, and improves the color of the poached green leaf vegetable product stored in normal-temperature condition. The nano ZnO antibacterial liquid (in which a sodium hexametaphosphate dispersion protector with concentration of 0.015% is added) is subjected to vacuum packing and low-frequency (915MHz) microwave uniform sterilization. The storage temperature is normal temperature. Through the invention, good color and fresh degree of the poached green leaf vegetable instant product are kept in the normal-temperature storage period.

The invention discloses a method and equipment for washing, disinfecting, sterilizing, preserving and processing fruits and vegetables with leaves. The method for washing, disinfecting, sterilizing, preserving and processing the fruits and vegetables with the leaves comprises the following steps: primarily selecting on line, automatically washing by ultrasonic waves, spraying and cleaning, drying and sterilizing, waxing and polishing, sterilizing, sorting and packaging. The preserving and processing method utilizes the ultrasonic waves to wash the fruits and vegetables with the leaves so as to reduce the damages to the fruits and vegetables with the leaves in the washing process; nano-grade natural pure lac wax is used as a raw material and is atomized by externally-arranged pneumatic high pressure through a motor-driven waxing device; under the effect of a precision metering pump, the fruits and vegetables with the leaves continually roll on a flexile hairbrush so that the peels of the fruits and vegetables with the leaves are uniformly coated with the fruit wax; the fruits and vegetables with the leaves are sterilized and disinfected before the waxed and polished fruits and vegetables with the leaves are packaged by grades, so as to further improve the food safety of the fruits and vegetables with the leaves.

The invention provides a preparation method used for instant auricularia auricula, comprising the steps as follows: auricularia auricula is washed; subsequently, the washed auricularia auricula is dried and sterilized in drying and sterilizing equipment so as to lead the weight of water attached to the auricularia auricula to be reduced to below 15% of total weight of the auricularia auricula; subsequently, the auricularia auricula and edible condiment juice are filled in a packaging bag; finally, a vacuum sealing method is used to seal the auricularia auricula and the edible condiment juice in the packaging bag; in the packaging bag, the auricularia auricula is pickled in the edible condiment juice for at least 1-10 hours. The instant auricularia auricula prepared by the preparation method has fresh flavor and good taste; the instant auricularia auricula can be convenient to be eaten by opening the bag and can keep natural taste and nutrient composition.

The invention discloses a method of improving the freezing speed and quality of litchi chinensis through variable frequency ultrasonic enhancement. The method comprises the following steps: pretreating fresh litchi chinensis, precooling, adding refrigerating fluid for impregnating, and conducting variable-frequency ultrasonic treatment, namely treating for 20-60s under the frequency of 20-40kHz by adopting the ultrasonic wave with the power of 40-300W, and then increasing the frequency to 40-80kHz for treating for 20-60s under the equal power. With the method, the freezing speed of the litchi chinensis can be increased, the freezing time can be shortened, and unfrozen juice loss rate can be reduced.

The invention relates to an optical signal technology physical method for preserving vegetables and fruits and an optical signal generating device. By adopting a computer programmable pulse scanning signal generator, the invention controls a light-emitting device with a red, green and blue light source pack to generate a pulse-type optical signal or an optical signal of a pulse-type periodical scanning combined spectrum so as to illuminate fresh vegetables and fruits stored in a storage device under a room-temperature storage condition or a temperature and moisture control condition. Under the physical environmental condition of an artificial optical signal, the illuminated fresh vegetables and fruits obtain photon energy needed for an optical reaction in photosynthesis in an optical signal illumination environment with periodical brightness change so that cell tissues recover metabolism and maintain the slow operation of metabolism and growth inertia; through controlling the optical signal of a periodical pulse spectrum or a periodical pulse scanning spectrum or a periodical pulse scanning combined spectrum, and the illuminance, the pulse period and the combined scanning mode of a visible spectrum optical signal emitted by the red, green and blue light source pack are controllable so as to achieve the aims of controlling the slow growth process of the harvested vegetables and fruits under the room-temperature condition or the temperature and moisture control condition, effectively prolonging the fresh state of the harvested vegetables and fruits by the slow metabolism operation of the preserved vegetables and fruits, keeping the freshness of the stored vegetables and fruits and prolonging the preservation time.

The invention discloses a combined sterilization method for freeze-dried food quality preservation by ozone, ultraviolet rays and nano-silver coating film, which belongs to the technical field of dry food safety control. The main process of the joint sterilization is: for freeze-dried food, use nano-silver for pretreatment of raw materials and ozone sterilization of finished products or a combination of ozone and other technologies to control the microbial content within 1000/g, coliform bacteria group (or Escherichia coli) up to standard (negative). The present invention adopts the method of combining ozone, ultraviolet rays and nano-silver, and also includes a new process for subsequent removal of residual ozone, which not only increases the effect of ozone sterilization, but also makes the product after sterilization can control the microbial content within a safe range, and at the same time It does not damage the quality, characteristics, taste and nutritional content of freeze-dried food.

Methods and apparatus for the sanitation and surface disinfection of edible produce such as lettuce, spinach and other leafy vegetables and fruits and vegetables such as apples, plums, pears, tomatoes having a protective skin. A centrifuge for receiving washed produce may be selectively spun to remove excess washing fluid, irradiated with UV-C energy and/or exposed to an ozone field while within the centrifuge. Air may be used for evaporative drying of the washed produce.

The invention discloses a vegetable fresh-keeping method which includes the steps: (1) sorting and cleaning fresh vegetables, cutting the cleaned vegetables into sections, and placing the vegetables cut into sections into trays; (2) performing sterilization on the trays with the fresh vegetables for 1-15min by leading into low-temperature plasmas; (3) continuing to lead into mixed gas of O2, CO2 and N2 after sterilization, and performing modified atmosphere packaging and refrigeration. The mixed gas of O2, CO2 and N2 generates the low-temperature plasmas through a dielectric barrier discharge device. Microorganisms of the surfaces of the vegetables and the trays can be reduced, corruption rate is slowed down, sense and nutritional quality of products are ensured, the method is obvious in treatment effect, safe, efficient, low in energy consumption, free from exhaust gas residue, simple to operate and convenient and flexible to use, modified atmosphere packaging can be performed by the aid of the trays with stock sizes, and popularization and industrial application are facilitated.

The invention provides a low-temperature plasma method for keeping fresh of fruits and vegetables. According to the method, an apparatus for coupling low-temperature plasmas and a catalyst is utilized to perform cycling processing on ethylene in gardening product storage environment, so that the fresh-keeping period of fruits and vegetable such as bananas, cucumbers and the like are prolonged. Experiments confirm that plasma discharge processing has interference effect on metabolism of stored cucumber and has certain fresh-keeping effect on stored cucumbers; when a plasma reactor performs discharging processing on bananas for 2 h every day, the ethylene gas concentration in the environment is far higher than the ethylene gas concentration of a contrast group; and the ethylene accumulation speed in the environment is high than the ethylene gas degradation speed, therefore the destroy degree on banana pericarp cell membrane systems at room temperature is alleviated, green fading and yellowing of banana pericarp are inhibited, and fresh keeping is facilitated.

This invention relates to a method, process and apparatus for disinfecting and sterilizing all types of surfaces contaminated with microorganisms and toxic substances to render both inactive. Furthermore, this invention relates to both a method and apparatus for disinfecting and/or sterilizing breathable air and then using this air to protect a confined space from external contamination. The apparatus consists of a new ultra-violet (NUV) source that is more effective than mercury based 254 nm light for destroying DNA of virus, bacteria, spores and cists. It is most effective in breaking chemical bonds in toxic gases and Biotoxins that are useful to terrorists. It is combined with other apparatus that remove particulates and byproducts sometimes produced by the NUV source and maintains positive pressure of the confined space so as to prevent the influx of air from outside the protected zone.

The invention belongs to the technical field of food and provides a fresh-keeping technology of cleaning, crispy-keeping, alkaline solution and microwave enzyme inactivation, and vacuum packing of leafy vegetables. The technology has the characteristics that the microwave technology is adopted; the enzyme inactivation effect is good; the inactivation rate of peroxydase can reach 96.8%; the physical appearances of vegetables are better preserved; and the loss of nutrient substances like vitamin c is less. The technology has the advantages that the detect is overcome that when the leafy vegetables are blanched by conventional hot water for a short time, the enzyme inhibition rate is low; the defect is overcome that when the leafy vegetables are blanched by hot water for a long time, the vegetables soften and turn yellow, and the loss of the nutrient elements of vegetables is great; and the alkaline solution and microwave blanching is adopted, so that the thorough inactivation of chlorophyllase is realized, green preserving process can be simplified, and the problem that heavy mental is left over in green preserving liquid is solved.