CN1676006A - Glass-state storage method for modifying quick-frozen conditioning fruit-vegetable quality - Google Patents
Glass-state storage method for modifying quick-frozen conditioning fruit-vegetable quality Download PDFInfo
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Abstract
The present invention relates to a vetrification storage method for raising quality of fast-frozen fruit and vegetable. Said method mainly includes the following steps: (1) selecting vegetable and fruit raw material, washing, peeling (coring) and slicing/block cutting; (2) scalding (100 deg.C, 15 sec.) and cooling; (3) conditioning (vacuum osmosis treatment); (4) measuring glass-transition temperature of said raw material; (5) making the conditioned raw material undergo the processes of liquid nitrogen or liquid state CO2 quick dip freezing treatment so as to make the temperature of said raw material be quckly reduced to the required temperature, then packaging; and (6). cold-storing the frozen raw material in freezer chest (temperature can be regulated below the glass transition temperature of said raw material.
Description
Technical field
A kind of glass storage method that improves quick-frozen conditioning fruit-vegetable quality the invention belongs to the technical field of fruit and vegetable fresh preservation, relates to the chilled storage of fruits and vegetables.
Background technology
Chilled storage (cold storage) technology is meant that employing is frozen slowly or the mode of quick-frozen makes material temperature be reduced to the temperature of regulation, and then preserves under the condition of-18 ℃ or-28 ℃.Adopt the food material of chilled storage,, thereby can prolong the shelf-life of product because its temperature is low.Just because of this reason, chilled storage is extensive use in food processing, the frozen food industry has also obtained fast development, food refrigerated patent is also more and more, is exactly to utilize the method that refrigerates to prolong the storage period of fresh leonurus as the preservation method (number of patent application 03118829.X) of the fresh leonurus of people such as Mao Youchang invention; A kind of freezing storage method for fresh date (patent No. 98102227.8) of people such as Deng Ximin invention also is the storage period that prolongs bright jujube by the method for refrigeration.
Though chilled storage can prolong the shelf life of product, improve the storage-stable of product, but because the existence of ice crystal and constantly growth, common frozen food various quality problems can occur in the chilled storage process, as: the change color of product (as enzymatic browning, chlorisis etc.), tissue cave in, juice loss causes nutritional labeling loss, drying loss etc., and the freezing fruits and vegetables that moisture is very high are particularly serious.Thereby influenced matter structure, outward appearance and the nutrition etc. of product greatly, reduced the commercial value of product.
It is temperature-fall period and storage that frozen food formation ice crystal depends primarily on two processes.Slowly freezing in the process, the at first crystallization of extracellular moisture causes the extracellular solution concentration to increase, and intracellular moisture then constantly is penetrated into the extracellular and continues to solidify, and forms bigger ice crystal in extracellular space at last.Cell is subjected to the ice crystal extruding to produce distortion or breaks, and has destroyed the institutional framework of food, and the back juice loss that thaws is many, can not keep original outward appearance of food and freshness, and quality obviously descends.
The excessive problem of ice crystal that causes at slow freezing, usually adopting the method for quick-frozen to solve, is exactly to adopt the method for quick-frozen to solve the fresh-keeping problem of hawthorn as the processing method (number of patent application is 98110541.6) of the quick frozen haw food of Liu Zhiguang application.Because in freezing process fast, quick-frozen can with the shortest time by maximum crystal region, in food tissue, form equally distributed tiny ice crystal, the institutional framework destructiveness is reduced greatly, the food after thawing can keep original color substantially.Song Yinglu also with regard to the application of red date quick-freezing fresh-keeping technology patent (number of patent application is 97108696.6), the freshness date of utilizing the quick-freezing fresh-keeping technology in this patent can prolong red date.But simple quick-frozen can not solve the problem that ice crystal is grown up in the follow-up storage.
Frozen Prepared Food is to be primary raw material with aquatic products, agricultural product or livestock products, through modulation processing, and IQF keeps the frozen food of frozen state, wherein the freezing precook fruits and vegetables have functions such as nutrition, health care because of it becomes a class conditioning food with fastest developing speed (Lv Rongxin, Frozen Prepared Food general situation of development and trend, refrigeration, 1995,4:30-34).Frozen Prepared Food has two characteristics: it also belongs to the frozen food category one, thereby has the problem of frozen food in processing and storage equally; On the other hand, Frozen Prepared Food arrived only need behind consumer's the hand just edible through simple processing, higher to the requirement of product, thereby more will take effective keeping method.At present, also few for the bibliographical information of freezing precook fruit-vegetable food storage practice research, domesticly yet there are no relevant patent application.
The glass storage of frozen food is meant that frozen food is realized vitrifying and in its a kind of method of preserving below the glass transition temperature.The food polymer science theory that U.S. Levince and Slade propose is thought: food material is preserved under glassy state, and all that cause that food quality changes are subjected to the reaction rate of DIFFUSION CONTROLLED all very slow, even can not take place.Therefore food adopts the vitrifying preservation, can keep its original color, shape and nutritional labeling to greatest extent.
At present more to the research of the vitrifying method for preserving of frozen fresh food, as Hua Ze encourage etc. the people (strawberry is freezed the experimental study that vitrifying is preserved. Shanghai University of Science and Technology's journal, 1999,21 (2): 180-183) vitrifying of freezing of having studied fresh strawberry is preserved, the result shows to preserve in the strawberry quality of glassy state and obviously is better than being housed in strawberry quality under the general commercial temperature, field National Day (the refrigeration glass preservation of aquatic products. Zhejiang Shuren University's journal, 2002,2 (6): 66-70) also studied aquatic products and used the problem of refrigeration glass preservation and use prospect.People such as Song Lihua (low-temperature quick-freezing realizes that meat segment glass metallization processes inquires into. Shanghai Communications University's journal (agricultural sciences version), 2002,20 (3): 244-247) studied the technology that low-temperature quick-freezing is realized the meat segment glassization.But FF generally is difficult to reach because its moisture height causes the glass transition temperature of food material very low on the one hand; On the other hand, because a large amount of water exists, make in refrigerating process, to be difficult to realize the complete or most of vitrifying of material, thereby product quality can't obtain maximum maintenance.Conditioning food is owing to passed through the vacuum infiltration processed before freezing, removed most water, can improve on the one hand the glass transition temperature of material, reach vitrifying easilier in the snap frozen process on the other hand, can access greatly the quality of material and keep.But yet there are no the play-by-play of the glass storage aspect of conditioning fruit-vegetable.
Summary of the invention
The method that the purpose of this invention is to provide a kind of quick-frozen conditioning fruit-vegetable storage relates to fruit vegetables storing processing, can be used for the storage of all kinds of quick-freezing fruit vegetables.
Technical solution: the main process of quick-frozen conditioning fruit-vegetable glass storage method comprises: 1) (nuclear), section/piece are chosen, wash, removed the peel to raw materials such as vegetables, fruit earlier.2) sheet that will cut carry out blanching handle (100 ℃, 15s), cooling.3) will cool off good raw material and nurse one's health (as carrying out vacuum infiltration, other processing).4) measure the glass transition temperature of this raw material.5) conditioned raw material is carried out snap frozen again, it is temperature required that material temperature is dropped to rapidly, packs then.6) raw material that freezes be placed in the reach in freezer refrigerate (it is following that the temperature of reach in freezer should be the material glass transition temperature).
The key that realizes the frozen food glass storage is exactly to measure the glass transition temperature of food material, measures the method for glass transition temperature at present and mainly utilizes analytical instrument multiple heat such as DSC, NMR and DMA, machinery, power, electricity.The glass transition temperature of measuring food material among the present invention adopts the DSC-7 instrument, and adopts annealing in process in measuring process.The factor that influences glass transition temperature has a lot, moisture or water activity that wherein topmost influence factor is exactly a food material.Moisture is less than 20% food material, and its glass transition temperature is general＞0 ℃, and moisture is greater than 20% food material, and its glass transition temperature is general＜and 0 ℃.Secondly processing technology is also influential to glass transition temperature, also can influence the glass transition temperature of product as the cooldown rate difference.The condition determination that adopts in the measuring process is also influential to glass transition temperature in addition, and the condition determination that the mensuration of glass transition temperature of the present invention adopts is: 1) temperature drops to-50.00 ℃ by 30.00 ℃, and rate of temperature fall is 20.00 ℃/min; 2) be raised to 30.00 ℃ from-50.00 ℃, heating rate is 20.00 ℃/min; 3) by 30.00 ℃ to-35.00 ℃, rate of temperature fall is 20.00 ℃/min; 4) be incubated 10min down at-35.00 ℃; 5) drop to-50.00 ℃ from-35.00 ℃, rate of temperature fall is 5.00 ℃/min; 6) by-50.00 ℃ to 30.00 ℃, heating rate is 5.00 ℃/min.The material glass transition temperature of measuring among the present invention is about-35 ℃.
General fruits and vegetables are all very high because of moisture, its glass transition temperature is all very low usually, and general refrigerated condition all can't reach, therefore before the glass storage that carries out freezing fruits and vegetables, also to carry out preliminary treatment, to improve its glass transition temperature to raw-food material.The material that is generally used for improving in the fruits and vegetables glass transition temperature mainly is especially some macromolecular compounds of some carbohydrate, what use among the present invention is NOVATION starch and maltose, and these two kinds of compounds can improve the glass transition temperature of food material significantly.
Vacuum infiltration is a kind of permeating method commonly used in the fruits and vegetables, and it is compared with the normal pressure infiltration has lot of advantages, and at first time of penetration is short, and secondly osmotic effect is good, and the nutritional labeling loss is few.Therefore, what the present invention adopted when carrying out the fruits and vegetables conditioning is exactly the method for vacuum infiltration, and infiltration condition is: 25 ℃ of normal temperature, vacuum 0.08-0.1MPa, time of penetration 30min.Thereby the purpose that adopts the infiltration conditioning among the present invention can improve the glass transition temperature of food material on the one hand by the infiltration of carbohydrate; can make raw material lose a part of water by the adding of carbohydrate on the other hand; thereby reduce the ice crystal that generates in cooling or the storage, the institutional framework of better protection product.
The cooldown rate of freezing fruits and vegetables also is an important process of vitrifying preservation.Cooldown rate is slow, and the ice crystal that forms in the material cell is just big, and just big to the institutional framework destruction of material, the vitrifying degree of food material is just low; And cooldown rate is fast, food can pass through maximum crystal region with the shortest time in quick freezing process, in food tissue, can form equally distributed tiny ice crystal, even do not form ice crystal and directly reach vitrifying, destructiveness to institutional framework reduces greatly like this, food after thawing also can farthest keep original color, and can reach the complete vitrifying of food material when cooldown rate is enough fast.What adopt among the present invention is exactly the method for snap frozen, makes food material reach part or all of vitrifying.
Reserve temperature equally also is the most important factor of frozen food glass storage, only reaches the glass storage that enough low temperature just may realize material, and it is fixed that actual temp should come according to the glass transition temperature of material.The reserve temperature that uses among the present invention is-30 to-40 ℃.
Beneficial effect of the present invention: with compare owing to cooling off the background technology that forms the frozen food disorganization that big ice crystal causes at a slow speed, the present invention adopts the processing method of vacuum sugar infiltration in conjunction with snap frozen, not only can prevent the generation of big ice crystal, and overcome the problem of only utilizing method of freezing may cause the low temperature fracture in the background technology.
For the crystallisation problems again that the fluctuation owing to reserve temperature causes, the present invention adopts the method for glass storage can well solve the crystallisation problems again of frozen food.
In a word, compare with background technology, one aspect of the present invention adopts the method for vacuum sugar infiltration, can reduce the ice crystal that frozen food forms in freezing and storage, adopts the method for glass storage can solve the frozen food storage because the fluctuation of temperature causes crystallization more on the other hand.Therefore, adopt the present invention can make the freezing precook fruits and vegetables keep original color, shape and nutritional labeling to greatest extent, prolonged the storage period of freezing precook fruits and vegetables greatly, reduced the waste of raw material, thereby improved the commercial value of product.
The specific embodiment
Embodiment 1: the glass storage of quick-frozen conditioning sweet potato slices utilizes the DSC-7 instrument that the glass transition temperature of the bright sample of Ipomoea batatas (Tg ') is measured, and the result shows that the glass transition temperature (Tg ') of Ipomoea batatas fresh sample is-30.577 ℃.
The technological process of quick-frozen conditioning sweet potato slices: fresh Ipomoea batatas 1kg is through selecting, clean, cut into slices (100 ℃ of (about 4mm), blanchings, 15s), cold water cooling, (vacuum is 0.08～0.1Mpa to carry out the vacuum infiltration dehydration then, time of penetration is 30min, temperature is a room temperature, penetrating fluid is NOVATION 2600 15%w/w), (cooldown rate is 10 ℃/min～20 ℃/min with liquid carbon dioxide (78.9 ℃) fast deep cooling, outlet temperature is-50 ℃), packing, glass storage (reserve temperature is made an appointment with-40 ℃ below glass transition temperature).
Frozen sweet-potato sheet through this processing has all obtained best maintenance on color, outward appearance and nutritional labeling.The browning degree of Ipomoea batatas with to compare obvious minimizing in the same old way, drying loss obviously reduces, eucaryotic cell structure is more complete, nutritional labeling vitamin C loss is also few.
Embodiment 2: the glass storage of quick-frozen conditioning Kiwi berry piece
Utilize DSC-7 that the bright sample of Kiwi berry is carried out the mensuration of glass transition temperature (Tg '), the result shows that the glass transition temperature of the bright sample of Kiwi berry is-36.248 ℃.
The technological process of quick-frozen conditioning Kiwi berry piece: fresh Kiwi berry is selected, (100 ℃ of strippings and slicings, blanching, 15s), cold water cooling, (vacuum is 0.08～0.1Mpa to carry out the vacuum infiltration dehydration then, time of penetration is 30min, temperature is a room temperature, penetrating fluid is maltose (50%w/w), (cooldown rate is 10 ℃/min～20 ℃/min with liquid nitrogen (195.8 ℃) fast deep cooling, outlet temperature is-60 ℃), packing, glass storage (reserve temperature is made an appointment with-40 ℃ below glass transition temperature).
Freezing Kiwi berry piece through this processing has all obtained good maintenance on color, outward appearance and nutritional labeling.Bud green and the bright sample of Kiwi berry piece color is similar, drying loss with to comparing obvious minimizing in the same old way, it is more complete that eucaryotic cell structure keeps, nutritional labeling chlorophyll and vitamin C all keep finely.
Claims (2)
1. the glass storage method of a quick-frozen conditioning fruit-vegetable is characterized in that main process is: with fruit and vegetable materials choose earlier, wash, peeling and/or stoning, section, blanching, cooling, vacuum infiltration dehydration, quick-frozen, packing and glass storage;
Blanching: 100 ℃, 15s;
The vacuum infiltration dehydration: vacuum is 0.08～0.1Mpa, and penetrating fluid is the solution of various carbohydrate, carbohydrate, salt or flavouring, and its mass concentration is 15～50%, and temperature is a room temperature, and time of penetration is 30min;
Quick-frozen: the type of cooling employing liquid nitrogen or the liquid carbon dioxide fast deep of material are freezing;
Glass storage: reserve temperature is-30～-40 ℃ below the glass transition temperature of material.
2. storage practice according to claim 1 is characterized in that fruit and vegetable materials is vegetables, fruit or edible mushroom.
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Cited By (13)
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| CN100433984C (en) * | 2006-07-24 | 2008-11-19 | 海通食品集团股份有限公司 | Method for elevating vitrification transformation temperature of fruit and vegetable integral quick-freeze and quick-freeze method |
| CN101218936B (en) * | 2008-01-25 | 2010-09-08 | 王真明 | Fresh-keeping method for jujube |
| CN101194644B (en) * | 2007-12-26 | 2010-10-13 | 唐明霞 | Natural biological antisepsis method in quick frozen fruits and vegetables process cold preservation |
| CN101194645B (en) * | 2007-12-26 | 2011-05-04 | 唐明霞 | Quick freezing and cold preserving method for fruits and vegetables |
| CN103070221A (en) * | 2013-01-11 | 2013-05-01 | 浙江大学舟山海洋研究中心 | Method for quickly freezing belt fish and belt fish products |
| CN103284084A (en) * | 2012-02-24 | 2013-09-11 | 中科云健康科技(天津)有限公司 | Dried strawberry product with high SOD enzyme activity and its preparation method |
| CN104171995A (en) * | 2014-07-14 | 2014-12-03 | 天津寻味食品生产有限责任公司 | Preparation method and application of bitter gourd tea |
| CN104982501A (en) * | 2015-06-25 | 2015-10-21 | 浙江万里学院 | Method for liquid nitrogen glassy state freezing preservation of Penaeus vannamei |
| CN105211271A (en) * | 2015-11-12 | 2016-01-06 | 宁波市农业科学研究院 | The quick-freeze fresh-keeping method of bamboo shoots |
| CN105831232A (en) * | 2016-04-20 | 2016-08-10 | 南京中丰益农业科技有限公司 | Blanching-hot air-freezing three-stage type gumbo preservation method and application thereof |
| CN106857796A (en) * | 2017-01-13 | 2017-06-20 | 曲阜师范大学 | A kind of method for improving fruit vegetables storing stability |
| CN107318960A (en) * | 2017-08-14 | 2017-11-07 | 韩山师范学院 | A kind of dry processing method of fruit slice |
| CN114258944A (en) * | 2021-12-17 | 2022-04-01 | 农业农村部规划设计研究院 | Potato crop dehydration, frozen storage and fresh-keeping method |
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| CN100433984C (en) * | 2006-07-24 | 2008-11-19 | 海通食品集团股份有限公司 | Method for elevating vitrification transformation temperature of fruit and vegetable integral quick-freeze and quick-freeze method |
| CN101194644B (en) * | 2007-12-26 | 2010-10-13 | 唐明霞 | Natural biological antisepsis method in quick frozen fruits and vegetables process cold preservation |
| CN101194645B (en) * | 2007-12-26 | 2011-05-04 | 唐明霞 | Quick freezing and cold preserving method for fruits and vegetables |
| CN101218936B (en) * | 2008-01-25 | 2010-09-08 | 王真明 | Fresh-keeping method for jujube |
| CN103284084A (en) * | 2012-02-24 | 2013-09-11 | 中科云健康科技(天津)有限公司 | Dried strawberry product with high SOD enzyme activity and its preparation method |
| CN103070221A (en) * | 2013-01-11 | 2013-05-01 | 浙江大学舟山海洋研究中心 | Method for quickly freezing belt fish and belt fish products |
| CN103070221B (en) * | 2013-01-11 | 2015-03-18 | 浙江大学舟山海洋研究中心 | Method for quickly freezing belt fish and belt fish products |
| CN104171995A (en) * | 2014-07-14 | 2014-12-03 | 天津寻味食品生产有限责任公司 | Preparation method and application of bitter gourd tea |
| CN104982501A (en) * | 2015-06-25 | 2015-10-21 | 浙江万里学院 | Method for liquid nitrogen glassy state freezing preservation of Penaeus vannamei |
| CN104982501B (en) * | 2015-06-25 | 2018-09-28 | 浙江万里学院 | A kind of method that Penaeus Vannmei liquid nitrogen glassy state freezes preservation |
| CN105211271A (en) * | 2015-11-12 | 2016-01-06 | 宁波市农业科学研究院 | The quick-freeze fresh-keeping method of bamboo shoots |
| CN105831232A (en) * | 2016-04-20 | 2016-08-10 | 南京中丰益农业科技有限公司 | Blanching-hot air-freezing three-stage type gumbo preservation method and application thereof |
| CN106857796A (en) * | 2017-01-13 | 2017-06-20 | 曲阜师范大学 | A kind of method for improving fruit vegetables storing stability |
| CN107318960A (en) * | 2017-08-14 | 2017-11-07 | 韩山师范学院 | A kind of dry processing method of fruit slice |
| CN107318960B (en) * | 2017-08-14 | 2020-11-06 | 韩山师范学院 | Processing method of dried fruit slices |
| CN114258944A (en) * | 2021-12-17 | 2022-04-01 | 农业农村部规划设计研究院 | Potato crop dehydration, frozen storage and fresh-keeping method |
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