The regulation and control preservation method that a kind of leaf vegetables mixed atmosphere for foreign-going ship is preserved
Technical field
For the regulation and control preservation method that the leaf vegetables mixed atmosphere of foreign-going ship is preserved, belong to agricultural storage technical field of preservation of fresh.
Background technology
The typical leaf vegetables such as green vegetables, romaine lettuce, three-coloured amaranth, hair Chinese cabbage, medicine celery, spinach, Lettuce, caraway is the vegetables that Chinese residents generally eats.But the physiological metabolism effect of these vegetables enlivens, and especially its transpiration is very vigorous, except medicine celery, its blade table area is very large, thus, and this several vegetables very easily dehydration; And these vegetables are easily rotted.In addition, the storage temperature of these several vegetables is all lower, and too high storage temperature easily causes vegetables weightless, and occurs serious rotten problem.Therefore, the freshness date adopting some more effective means to extend these vegetables is extremely important.
The kind of existing vegetable fresh-keeping processing technology mainly contains following several method.First method is vegetable cold storing technology, does not namely regulate the gas component in preservation of vegetables environment, carries out cryopreservation to vegetables.The method is very general, has some advantages, mainly: refrigeration cost is low, does not need to be equipped with air distributing device etc., also obviously can extend the freshness date of vegetables.But the method also has certain drawback, such as: vegetables easily occur in cold storage procedure yellow, rot etc. anomaly.Second method, for adopting low temperature and high relative humidity preservation technique, is kept at uniform temperature (0-4 DEG C) by vegetables, and regulating environmental humidity is also higher simultaneously.This technology can suppress vegetables to a great extent, especially the respiration of leaf vegetables and transpiration, and the dehydration wilting problem of leaf vegetables obtains obvious control, and the freshness date of vegetables is also extended significantly.But vegetables easily accelerate the generation of problems such as rotting because humidity is too high.In addition, the 3rd class methods adopt to pass into a certain amount of inert gas in preservation of vegetables environment and the mode of carrying out preservation by low temperature.But the method has some defects: the concentration of the inert gas in a, storeroom is difficult to keep in balance unanimously; B, indifferent gas are known from experience and are passed in and out fresh-keeping warehouse because of staff or run off in a large number because of reasons such as the air-tightness of equipment and gas exchanges; After c, deliver from vault indoor are full of inert gas, indoor oxygen concentration may reduce, and thus personal security may be endangered; D, equipment cost are high, and because complete equipment must be equipped with a set of inert gas control device, thus cost can increase.
Above three kinds of modes all have certain value in the controlled atmosphere process of vegetables, but, for leaf vegetables, also has a kind of controlled atmosphere mode, namely by regulating the gas component (mainly changing the ratio of oxygen, carbon dioxide and nitrogen) in fresh-keeping warehouse, and relative humidity in regulation warehouse body and Ku Wen realize the target of the freshness date of significant prolongation vegetables.This technology has many-sided advantage, the quality that can obviously slow down in fresh-keeping of vegetables process declines, and extends the freshness date of vegetables as far as possible, and thus this technology is specially adapted to the special occasions needing long-term storage vegetables, such as oceangoing voyage, and technical costs is relatively low.Thus, this technology possesses very strong market using value and potentiality.
Wu Yadong discloses the air regulating fresh-keeping method (CN 103004969 A) of a kind of spinach, this patent by need fresh-keeping spinach pluck, sorting, precooling, sterilization treatment, subsequently, spinach low barrier packing box or packaging bag are packed, in the packing container of spinach, pass into the mist of oxygen, carbon dioxide and nitrogen, gas ratio is followed successively by: 1%-8%, 1%-6%, 85%-95%.Refrigerate under being placed on low temperature.The method consists of adjustments of gas and adopts cryopreservation mode, and thus spinach respiration can be suppressed to greatest extent; In addition, employing controlled atmospheric packing can suppress the moisture loss in spinach, and thus, equipment does not need to be equipped with fixing damping device.In addition, this technique also has other advantages, such as: with low cost; Because packed and transported and deposit position are relatively easy, the controlled atmospheric packing bag of vegetables is very convenient.
Lu Lixin and Cai Ying has invented a kind of method (publication number: CN 101228892A) of film, ozone pretreatment and microporous barrier controlled atmospheric packing combine freshness.This method is by Ozone Water process mushroom, and mushroom again through chitosan solution coating problems, then dries, and is placed in polypropylene pallet, packs with microporous barrier involution, stores at 0-5 DEG C.This invention effectively can reduce the clump count on mushroom surface, reduces the respiratory rate of product; Gas and relative humidity in effective control packaging, reduce becoming sour of product, guarantees the security that product is edible, extends the shelf life of product.But this technique is not by regulating the gas component in mushroom storage ambient, thus, this technique, with regard to fresh-keeping effect, can continue to optimize.By changing the temperature conditions in storage ambient, the shelf life of mushroom and edible quality can further be extended.
Hua Jingqing has invented a kind of air regulating fresh-keeping method about wild four leaf vegetables (publication number: CN 103392788 A), adopt wild four leaf vegetables, by plucking raw material, precooling and selecting, subsequently, the certain density saline solution of raw material is soaked, through dehydration and sterilization treatment, subsequently, controlled atmospheric packing is carried out to vegetables, using a certain proportion of oxygen, carbon dioxide and nitrogen as controlled atmospheric packing gas, refrigerates.This invention can reduce the change of the nutritional labeling of four leaf vegetables after controlled atmosphere, keeps its original freshness to greatest extent, color and luster and local flavor, can reach and prolong storage period, and play the object filling up market surplus and deficiency.
Kingliness friend, Zhu Jiying and Wang Juan disclose the patent (publication number: CN 101011178A) of the air regulating fresh-keeping method of a kind of Dual Mushroom mushroom, the method is that Dual Mushroom mushroom is placed in air-conditioned cold store, regulate relative humidity, the temperature of air-conditioned cold store, and change the concentration proportioning of oxygen, carbon dioxide and the nitrogen in air-conditioned cold store, cryopreservation is carried out to Dual Mushroom mushroom.This technique has some advantages: this invention compared with prior art, can effectively solve Dual Mushroom mushroom adopt rear easy parachute-opening, brown stain and quality deterioration fast, be difficult to the difficult problems such as long-term accumulating, and making the shelf time of Dual Mushroom mushroom extend to 15 days, its operating procedure is simple, cost is lower, processing procedure is without chemical residual.
Shen Lian waits clearly people (1999) to have studied the controlled atmospheric packing of green vegetables.They adopt controlled atmospheric packing, blanching process to green vegetables, and employ suction ethylene agent.Research shows that the blanching process of proper temperature can alleviate the yellow in green vegetables storage, and the ethylene absorbent of more than 2% concentration significantly can affect the storage of green vegetables.In addition, they find to adopt 2%O
2+ 2%CO
2controlled atmospheric packing mode, the performance optimal of vegetables.But, blanching process in this technical scheme is inapplicable for business-like fresh-keeping of vegetables pattern, the vegetables after to blanching are needed to drain or the process such as dehydration, technique is relatively relatively complicated, and, ethylene absorbent compare be applicable to small lot and short-term storage, be not very applicable to oceangoing voyage.
Promotion carries out 1-MCP process to pakchoi, find that 1-MCP process can suppress SOD, CAT, APX and POD in vegetables active, and for the increase of the electrical conductivity in fresh-keeping of vegetables process, there is obvious inhibitory action, in addition, 1-MCP effectively can delay soluble protein in vegetables and chlorophyllous decline.
The people such as Guo Yuhua (2008) have studied the nanometer controlled atmospheric packing technique of Lettuce.They find, using molecular sieve nanometer air-conditioning preservative film after the packaging of Lettuce, because molecular sieve is to the gas-selectively of the uniqueness of oxygen and carbon dioxide, fresh-keeping effect is very good.Sieve technology has good preservation for vegetables, and there is future application prospect very widely, but, adopt the controlled atmospheric packing mode of molecular sieve, comparatively be applicable to small lot occasion, further, in freezer, the amount of storage of vegetables can be subject to the restriction of the stacking mode of sack and sack, compares and is applicable to small lot batch manufacture.
Guo Xin have studied the dynamic air conditioning technology of green vegetables, namely by the ethylene removal technology in research green vegetables controlled atmosphere process, to ensure the low ethylene content in preservation of vegetables process.This technology in laboratory conditions, achieves good effect.But whether the method is applicable in large-scale production, need discussion and research.Further, the method requires higher to the consumption of ethylene scavenger, and uses and inconvenience.
Generally, occurred a lot of technology about vegetables controlled atmosphere at present both at home and abroad, these technology have achieved certain effect.But existing research nearly all concentrate on single vegetables and fruits fresh-keeping on, and very deficient about the paper information of the controlled atmosphere of multiple vegetables of the same type, and the whole world also nobody application cross the patented technology of the controlled atmosphere technology about mixed greens.And the present invention mainly with multiple typical leaf vegetables (green vegetables, romaine lettuce, medicine celery, three-coloured amaranth, hair Chinese cabbage etc.) for raw material, be placed in same air-conditioned cold store, adopt certain storage condition (gas composition, relative humidity and temperature), realize the target extending the freshness date of several vegetables as far as possible.In fact, in the occasion that some are special, especially in oceangoing voyage, because the quantity of modified atmosphere fresh-keeping storage is very limited, and crewman is very large for the demand of the kind of vegetables and quantity, therefore, oceangoing voyage must be faced with under various vegetables is placed in same ca cold storage condition, therefore, a kind of leaf vegetables mixed atmosphere stored manner is invented extremely important.
The present invention, compared with existing controlled atmosphere mode, has more following advantages.The present invention adopts modified atmosphere fresh-keeping storage to store.On the one hand, the mixing that the present invention is directed to various vegetables is fresh-keeping, thus, goes for more occasion, during fresh-keeping of vegetables, can not be subject to the quantitative limitation of modified atmosphere fresh-keeping storage number, according to the characteristic of different vegetable, can increase the kind of vegetables, and technology application is more convenient.On the other hand, by monitoring the conditions such as temperature, gas component and humidity in controlled atmosphere process in real time, the present invention can realize the storage condition of real-time monitoring fresh-keeping of vegetables process, and extend the freshness date of vegetables as far as possible to greatest extent, delay the loss of vegetables Middle nutrition composition, and keep local flavor and the matter structure of vegetables as far as possible.In addition, the present invention can regulate and control the ethylene contents in the storehouse body in controlled atmosphere process, and is therefrom removed by ethene by other gases, can reduce the short aging effect of ethene to vegetables as far as possible.Finally, the present invention is applicable to oceangoing voyage.
Summary of the invention
The object of this invention is to provide the regulation and control preservation method that a kind of leaf vegetables mixed atmosphere for foreign-going ship is stored, to overcome the defect that existing controlled atmosphere mode exists.
Technical scheme of the present invention: the regulation and control preservation method that a kind of leaf vegetables mixed atmosphere for foreign-going ship is stored, adopts two-part controlled atmosphere to leaf vegetables, comprises the steps:
(1) pluck, sorting: for needing fresh-keeping typical leaf vegetables, lower abbreviation typical case leaf vegetables: green vegetables, romaine lettuce, three-coloured amaranth, water spinach, hair Chinese cabbage, medicine celery, spinach, Lettuce, caraway carry out plucking, sorting;
(2) basket is filled: be respectively charged in different baskets by the typical leaf vegetables after harvesting, sorting;
(3) precooling: the typical leaf vegetables of dress is carried out precooling operation;
(4) sterilizing: modified atmosphere fresh-keeping storage is carried out sterilization treatment;
(5) two-part controlled atmosphere: by the basket outer cover last layer preservative film of the typical leaf vegetables of dress, preservative film specification is long × wide × thick: 1m × 1m × 0.05mm, and is placed in modified atmosphere fresh-keeping storage, setting controlled atmosphere parameter; Adopt two-part controlled atmosphere mode, first 20 days, gas component was: 4 ± 1% O
2, 96 ± 1% N
2, temperature: 1 ± 0.5 DEG C, relative humidity 90 ± 4%; After 20 days, gas component is: 6 ± 1% O
2, 94 ± 1% N
2, temperature: 1 ± 0.5 DEG C, relative humidity 85 ± 5%; Fresh-keeping warehouse is built with corresponding humidity sensor and the automatic damping device controlled, monitor the humidity condition in storehouse at any time, if humidity is not as good as minimum relative humidity, then automatically control according to the measured data of humidity sensor the steam that damping device sprays into appropriate atomization in storehouse, to ensure that vegetables humidity meets specification.
Selected vegetables all select medium well carrying out to pluck, and the vegetables occurring mechanical damage, yellow, brown stain, wilting and rot are removed in vegetables in sorting.
The length of often kind of vegetables basket used, width and height dimension are 510cm × 355cm × 310cm; Every basket of vegetables quality remains on 4.2-7.9kg.
The precooling temperature of modified atmosphere fresh-keeping storage is regulated to be set as when the precooling of step (3) operates: 1-3 DEG C, pre-coo time >=12h.
Step (4) described sterilization treatment refers to and arrange air sterilization system in modified atmosphere fresh-keeping storage, adopts ozone gas to carry out sterilizing to vegetables.
Beneficial effect of the present invention:
Compared with common controlled atmosphere mode or refrigeration, adopt method of the present invention, can extend shelf life when vegetables mix Tibetan significantly, can slow down the decline of nutritional quality to greatest extent, in addition, the present invention is specially adapted to oceangoing voyage.Adopt method of the present invention, at controlled atmosphere after 45 days, the weight-loss ratio of Typical Vegetable all lower than 3%, the nutritional labeling chlorophyll of vegetables and the retention rate of Vc higher than 60%, the hardness of Typical Vegetable be these vegetables fresh time more than 70%, show that the quality of vegetables is better.These data are far above most controlled atmosphere data.Finally, the color and luster of the vegetables after controlled atmosphere is better, with fresh vegetables relatively.After storage in 45 days, therefore, this air regulating fresh-keeping method is specially adapted to the occasions such as such as oceangoing voyage.
Detailed description of the invention
Embodiment 1: three kind
typical case leaf vegetablesmixed atmosphere storage control methods
1) spinach, Lettuce and three-coloured amaranth select maturity to be medium well, carry out plucking and sorting, remove the vegetables wherein having occurred yellow, brown stain, wilting, mechanical damage and rotted;
2) spinach, Lettuce and three-coloured amaranth are respectively charged in different baskets; And overlap last layer preservative film, its specification is long × wide × thick: 1m × 1m × 0.05mm, the length, width and height of often kind of vegetables basket used are followed successively by 510cm, 355cm and 310cm, and every basket of vegetables quality is at 4.2-7.9 kg.
3) vegetables after harvesting, sorting are carried out precooling operation; The temperature of modified atmosphere fresh-keeping storage is set to: 1-3 DEG C, pre-coo time >=12h.
4) carry out sterilization processing with ozone generator to storehouse and vegetables, sterilizing time is set as 1-2h.
5) open modified atmosphere fresh-keeping storage, modified atmosphere fresh-keeping storage condition setting is divided into two sections, first 20 days, adopts following condition: concentration 4 ± 1%, 96 ± 1% N of oxygen
2, temperature 1 ± 0.5 DEG C, relative humidity 90 ± 4%.After 20 days, adopt following condition: concentration 6 ± 1%, 94 ± 1% N of oxygen
2, temperature 1 ± 0.5 DEG C, relative humidity 85 ± 5%.
6) at the end of the shelf time of 45 days, the quality of vegetables is better.Vegetables color and luster and fresh vegetables difference not obvious, the storage rate of Vc is higher than 69%, and Chlorophyll preservation is higher than 75%, and vegetables matter structure is more crisp.
The mixed atmosphere storage control methods of embodiment 2: five kinds of typical leaf vegetables
1) green vegetables, romaine lettuce, three-coloured amaranth, hair Chinese cabbage and medicine celery select maturity to be medium well, carry out plucking and sorting, remove the vegetables wherein having occurred yellow, brown stain, wilting, mechanical damage and rotted;
2) three-coloured amaranth and medicine celery are respectively charged in different baskets; And overlap last layer preservative film, its specification is long × wide × thick: 1m × 1m × 0.05mm, the length, width and height of often kind of vegetables basket used are followed successively by 510cm, 355cm and 310cm, and every basket of vegetables quality is at 5.5-7.2kg.
3) vegetables after harvesting, sorting are carried out sterilization and precooling operation.Sterilization and precooling are synchronously carried out, be about to the basket outer cover last layer freshness protection package of dress vegetables, and be placed in modified atmosphere fresh-keeping storage, vegetables are placed in modified atmosphere fresh-keeping storage, ozone generator is also placed in modified atmosphere fresh-keeping storage, synchronously carry out sterilization processing to modified atmosphere fresh-keeping storage and vegetables, the temperature arranging modified atmosphere fresh-keeping storage is set as: 1-2 DEG C, first modified atmosphere fresh-keeping storage is carried out to the sterilization processing of 1-1.5h, subsequently, carry out precooling, precooling temperature is set to: 1-2 DEG C, and pre-coo time is more than or equal to 12 hours.
4) vegetables adopt two-part controlled atmosphere mode.Modified atmosphere fresh-keeping storage condition setting is divided into two sections, first 20 days, adopts following condition: concentration 4 ± 1%, 96 ± 1% N of oxygen
2, temperature 1 ± 0.5 DEG C, relative humidity 90 ± 4%.After 20 days, adopt following condition: concentration 6 ± 1%, 94 ± 1% N of oxygen
2, temperature 1 ± 0.5 DEG C, relative humidity 85 ± 5%.
5) at the end of the shelf time of 45 days, the quality of vegetables is better.Vegetables color and luster and fresh vegetables difference not obvious, the storage rate of Vc is higher than 64%, and Chlorophyll preservation is higher than 69%, and vegetables matter structure is more crisp.
The mixed atmosphere storage control methods of embodiment 3: seven kinds of typical leaf vegetables
1) green vegetables, spinach, three-coloured amaranth, water spinach, caraway, hair Chinese cabbage and medicine celery select maturity to be medium well, carry out plucking and sorting, remove the vegetables wherein having occurred yellow, brown stain, wilting, mechanical damage and rotted;
2) green vegetables, spinach, three-coloured amaranth, water spinach, caraway, hair Chinese cabbage are respectively charged in different baskets from medicine celery; And overlap last layer preservative film, its specification is long × wide × thick: 1m × 1m × 0.05mm, the length, width and height of often kind of vegetables basket used are followed successively by 510cm, 355cm and 310cm, and every basket of vegetables quality is at 5.5-7.2kg.
3) vegetables after harvesting, sorting are carried out sterilization and precooling operation.Sterilization and precooling are synchronously carried out, be about to the basket outer cover last layer freshness protection package of dress vegetables, and be placed in modified atmosphere fresh-keeping storage, vegetables are placed in modified atmosphere fresh-keeping storage, ozone generator is also placed in modified atmosphere fresh-keeping storage, synchronously carry out sterilization processing to modified atmosphere fresh-keeping storage and vegetables, the temperature arranging modified atmosphere fresh-keeping storage is set as: 1-2 DEG C, first modified atmosphere fresh-keeping storage is carried out to the sterilization processing of 1-1.5h, subsequently, carry out precooling, precooling temperature is set to: 1-2 DEG C, and pre-coo time is more than or equal to 12 hours.
4) vegetables adopt two-part controlled atmosphere mode.Modified atmosphere fresh-keeping storage condition setting is divided into two sections, first 20 days, adopts following condition: concentration 4 ± 1%, 96 ± 1% N of oxygen
2, temperature 1 ± 0.5 DEG C, relative humidity 90 ± 4%.After 20 days, adopt following condition: concentration 6 ± 1%, 94 ± 1% N of oxygen
2, temperature 1 ± 0.5 DEG C, relative humidity 85 ± 5%.
5) at the end of the shelf time of 45 days, the quality of vegetables is better.Vegetables color and luster and fresh vegetables difference not obvious, the storage rate of Vc is higher than 61%, and Chlorophyll preservation is higher than 62%, and vegetables matter structure is more crisp.