CN101438730B - Method for preparing dry red date and red date produced thereby - Google Patents
Method for preparing dry red date and red date produced thereby Download PDFInfo
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- CN101438730B CN101438730B CN2008102405384A CN200810240538A CN101438730B CN 101438730 B CN101438730 B CN 101438730B CN 2008102405384 A CN2008102405384 A CN 2008102405384A CN 200810240538 A CN200810240538 A CN 200810240538A CN 101438730 B CN101438730 B CN 101438730B
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Abstract
The invention discloses a preparation method for red dates by microwave vacuum drying, and red dates prepared thereof. The method comprises the following steps: pretreatment of the red dates, microwave vacuum drying of the pre-treated red dates and packing the red dates which undergoes microwave vacuum drying. The step of microwave vacuum drying to the red dates is as follows: the red dates are put in a microwave vacuum dryer, and the sectional microwave vacuum drying is carried out on the red dates; in the early stage of drying, the degree of vacuum in the drying chamber is maintained between 2 kPa to 15 kPa, the microwave power is selected between 1W/g to 5W/g, the drying temperature is controlled below 50 DEG C, and the drying time ranges from 10 min to 30 min; and in the later stage of drying, the degree of vacuum in the drying chamber is maintained between 2 kPa to 15 kPa, the microwave power is reduced to a magnitude of 0.5W/g to 3W/g, the drying time lasts for 20 min to 60 min, and the water content of the dried red dates ranges from 5 percent to 16 percent. The preparation method has rapid drying, is highly effective, energy-saving, environment-friendly and sanitary, can effectively maintain the original color, aroma, taste, active ingredients and the nutrient content of the red dates and provides the high-quality microwave-vacuum-dried red dates.
Description
Technical field
The present invention relates to a kind of food-processing method, relate in particular to a kind of processing method of dry red date.
Background technology
Red date is the exclusive fruit of China, and the whole world has only China to have the good jujube cultivars of commerial growing.Red date nutrient and health care are worth high, are famous and precious food, are again the good merchantable brands of nourishing.Be rich in vitamin C in the red date, vitamin B1, B2, A and vitamin E; Contain 16 seed amino acids, the arginine and the histidine that can not synthesize in 8 kinds of essential amino acids and the child's body are wherein arranged.Red date is except that containing above-mentioned common nutrient, also contain and have the very specific function composition of high bioactivity on a small quantity,, alkaloid general as: organic acid, three mushroom class materials, polysaccharide, cycli phosphate gland former times (C-AMP), soap two, flavones, gland and go out alcohol etc., these compositions are material bases that red date has plurality of health care functions.
Red date after gathering is used to eat raw on a small quantity, total output be made into dried jujube more than 95%, make it be suitable for storage and following process.The drying common employing of date is at present dried and heated-air drying, and be 20～24d the drying time of drying, and long-time airing is damaged the nutriment in the jujube fruit, has reduced jujube fruit matter, not only takes a lot of work but also time-consuming.Restricted by natural conditions, often meet rain in the mature period and rot, it is rotten to cause jujube really to go rotten, and bright jujube loss generally reaches 25%～30% of total output.Shorten to 18～24h the drying time of heated-air drying, baking temperature is about 65～70 ℃, and long-time high temperature drying causes the decline of higher organoleptic quality and nutritional labeling easily.
In addition, Chinese patent (publication number CN1543816, name is called a kind of fresh-keeping treating method of date) a kind of food fresh-keeping method disclosed, this method is carried out bright jujube selected earlier, choose disease worm jujube, slurry jujube, blue or green jujube, by size, maturity carries out classification, carries out preliminary treatment then, comprises cleaning, softening, stoning, section etc.To be positioned over that certain vacuum degree scope is in 267-400Pa (2-3Torr) hothouse through pretreated bright jujube section or bright jujube again, carry out processed in the two-sided dull and stereotyped radiant heat transfer formula vacuum drier of 10-45 ℃ of atmosphere temperature, with steam as heat medium, the dividing wall type heat supply, pressure is 0.01-0.03Mpa, 3-5 hour heat time heating time, decide on kind, slice thickness.This method as heat medium, is carried out processed to red date with steam, and therefore, still need reach 3-5 hour heat time heating time, caused the decline of nutritional labeling, and energy consumption is big.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method and prepared red date thereof of energy-efficient dry red date.
For achieving the above object, the invention provides a kind of preparation method of dry red date, comprise pre-treatment step, pretreated red date is carried out the step of micro-wave vacuum and the step that the red date behind the micro-wave vacuum is packed red date.
Wherein, described pre-treatment step to red date comprises red date is carried out assortment, cleaning, stoning.
Wherein, the step that red date is carried out micro-wave vacuum comprises puts into microwave vacuum dryer with red date, red date is carried out the micro-wave vacuum of segmentation.
Wherein, the micro-wave vacuum step that red date is carried out segmentation comprises carries out drying and later stage drying in early stage to red date, wherein, in the early stage drying, indoor vacuum 2～15kPa keeps dry, microwave power is chosen in 1W/g～5W/g, and baking temperature is controlled at below 50 ℃, drying time 10～30min; In the later stage drying, vacuum remains in 2～15kPa scope in the hothouse, and microwave power is reduced to 0.5W/g～3W/g, drying time 20～60min, the water content that is dried to red date is 5%～16%.
Preferably, in the early stage drying, vacuum remains on 15kPa in the hothouse, and microwave power is 4W/g, and be 10min drying time.
Preferably, in the later stage drying, vacuum remains on 15kPa in the hothouse, and microwave power is 2.5W/g, and be 26min drying time.
And the step that red date is packed comprises that the employing high-barrier composite material packs.
In addition, for achieving the above object, the present invention also provides a kind of preparation method of above-mentioned micro-wave vacuum red date prepared dry red date.
Wherein, the Vit C contents storage rate reaches 55.63% in this drying red date, and water content is between 7～11%.
The method of micro-wave vacuum red date of the present invention, because what micro-wave vacuum adopted is that radiation passes energy, it is the whole heating of medium, need not other heat catalysis, so speed is fast, efficient is high, shorten arid cycle greatly, shorten to 1～2h drying time, reduced energy consumption, meet the policy guidance of national energy-saving and emission-reduction.And vacuum environment has reduced the baking temperature of red date, can effectively avoid heat-sensitive ingredients and easy destroyed decomposition of oxidizing component and oxidation reaction in the red date, the infringement product quality.Simultaneously, realized the effect of sterilization health by microwave.And this method also is suitable for effects such as suitability for industrialized production.
In addition, the prepared micro-wave vacuum red date of the present invention keeps the original color of red date, shape, active component and nutritional labeling effectively.This product not only can be used as cooks congee or the dietary product of Baoshang, also can be used as the instant food of leisure
Description of drawings
Fig. 1 is preparation method's flow chart of microwave vacuum heat drying red date of the present invention.
Fig. 2 is preparation method's concrete steps flow chart of microwave vacuum heat drying red date of the present invention.
The specific embodiment
The present invention adopts microwave vacuum drying technology to carry out the drying processing of red date.Micro-wave vacuum is to utilize microwave energy to carry out drying under vacuum condition.Microwave is meant the electromagnetic wave of frequency 300 megahertz to 300 gigahertzs, under the effect of microwave electromagnetic field, polar molecule in the medium transfers the alternation of following microwave electromagnetic field to and oriented from original warm-up movement state, produced fierce frictional impact, make the molecule of polarity obtain energy, present significant fuel factor, material surface and temperature inside raise rapidly simultaneously, moisture in the evaporation material, thereby microwave energy is converted into heat energy carries out dry materials, therefore, improve rate of drying greatly, shortened drying time.Vacuum environment has reduced the pressure of microwave drying system, vacuum is high more, the absolute pressure of environment is low more, the boiling temperature of water is low more, baking temperature is low more, and the oxygen in the drying medium is rare more simultaneously, can reduce because the material change color that heat effect and oxidation cause, can avoid material suffered pyrolytic damage in dry run, highly beneficial to preserving original color of material and heat-sensitive substance etc.Property rapidly and efficiently and vacuum drying low temperature drying characteristics that micro-wave vacuum combines microwave drying can realize the quick low temperature drying of material, obtain high-quality dry products.
Fig. 1 is preparation method's flow chart of microwave vacuum heat drying red date of the present invention, as shown in Figure 1, the preparation method of micro-wave vacuum red date of the present invention comprises pre-treatment step (S1) to red date, pretreated red date is carried out the step (S2) of micro-wave vacuum and the step (S3) that the red date behind the micro-wave vacuum is packed.
Fig. 2 is preparation method's concrete steps flow chart of microwave vacuum heat drying red date of the present invention, as shown in Figure 2, comprises the steps:
Step 1: red date is carried out assortment, select the red date of even, the big or small unanimity of color, no disease and pest;
Step 2: adopt running water that red date is repeatedly cleaned, drain naturally;
Step 3: red date is carried out stoning handle, carry out micro-wave vacuum again, also can select not stoning directly to carry out micro-wave vacuum;
Step 4: red date is put into microwave vacuum dryer, carry out the segmentation micro-wave vacuum of red date;
Wherein, dry in early stage, the indoor vacuum 2～15kPa that keeps dry, microwave power is chosen in 1W/g～5W/g, baking temperature is controlled at below 50 ℃, drying time 10～30min; In the later stage drying, vacuum remains in 2～15kPa scope in the hothouse, and microwave power is reduced to 0.5W/g～3W/g, drying time 20～60min, the water content that is dried to red date is 5%～16%.
Step 5: adopt high-barrier composite material to pack.
Wherein, step 1,2,3 is for to carry out pretreated step to red date; The microwave vacuum heating steps of step 4 for red date is carried out segmentation, and the key step of the inventive method is this process; Step 5 is the last packing processing procedure to the red date that makes.
And preferably, in the early stage drying, vacuum remains on 15kPa in the hothouse, and microwave power is 4W/g, and be 10min drying time.In the later stage drying, vacuum remains on 15kPa in the hothouse, and microwave power is 2.5W/g, and be 26min drying time.
Below come the method for micro-wave vacuum red date of the present invention is described by specific embodiment.
Embodiment 1:
Bright jujube is carried out assortment, it is even to select color, size is consistent, the date 1070g of no disease and pest, with running water date is carried out twice cleaning, naturally drain, adopting homemade stoner to carry out the jujube stoning handles, jujube net weight 900g after the stoning is tiled in the stoning date and carries out the segmentation micro-wave vacuum in the microwave vacuum dryer, in the early stage drying, indoor vacuum 15kPa keeps dry, microwave power is selected 1.2kW for use, dry 18min, and drying evaporates portion of water, enter the later stage drying then, in the later stage drying, the vacuum in the hothouse still maintains 15kPa, and microwave power is selected 0.6kW for use, drying time 42min, obtaining dried date weight is 310g, and water content is 10.66%, adopts high-barrier high density food-grade polyethylene foil laminated film to pack.
Embodiment 2:
Bright jujube is carried out assortment, it is even to select color, size is consistent, the date 360g of no disease and pest, with running water red date is carried out twice cleaning, naturally drain, adopting stoner to carry out the jujube stoning handles, jujube net weight 305g after the stoning, the stoning date is tiled in carries out the segmentation micro-wave vacuum in the microwave vacuum dryer, in the early stage drying, the indoor vacuum 15kPa that keeps dry, microwave power is selected 1.2kW for use, dry 10min, enter the later stage drying again, the vacuum in the hothouse still maintains 15kPa, and microwave power is selected 0.6kW for use, drying time 26min, obtaining dried date weight is 100g, and water content is 9.10%, adopts high-barrier high density food-grade polyethylene foil laminated film to pack.
Embodiment 3:
Jujube is carried out assortment, it is even to select color, size is consistent, the date 600g of no disease and pest, with running water red date is carried out twice cleaning, naturally drain, do not carry out stoning and handle, date is tiled in carries out the segmentation micro-wave vacuum in the microwave vacuum dryer, in the early stage drying, indoor vacuum 10kPa keeps dry, microwave power is selected 1.2kW for use, and dry 12min enters the later stage drying then, vacuum in the hothouse still maintains 10kPa, microwave power is selected 0.6kW for use, drying time 36min, obtaining dried date weight is 215g, water content is 7.48%, adopts high-barrier high density food-grade polyethylene foil laminated film to pack.
Comparative example:
The Vc content and the Vc storage rate of micro-wave vacuum red date, heated-air drying jujube and the air dry jujube of bright jujube, embodiment 2 are analyzed concrete data such as following table:
From then on showing data shows as can be seen, the Vc content of the bright jujube of 100g is 397.98mg, the Vc content of micro-wave vacuum jujube of the present invention is 221.4mg, storage rate reaches 55.63%, the Vc storage rate of the air-dry dry jujube of specific heat has improved 16.12%, has improved 21.54% than the Vc storage rate of air dry jujube.
Simultaneously, comprehensive the foregoing description and list data can obtain: the prepared dry red date of the method by above-mentioned micro-wave vacuum red date provided by the present invention, its Vit C contents storage rate reaches 55.63%, water content can be between 7～11%, therefore, resulting dry red date is reducing moisture, is suitable under the situation of storage and following process, keep the ascorbic content in the red date greatly, and kept the original color and luster of red date, fragrance and nutritional labeling.
Manufacture method of the present invention has following advantage:
A. rapid draing.What micro-wave vacuum adopted is that radiation passes energy, is the whole heating of medium, need not other heat catalysis, so speed is fast, efficient is high, shorten arid cycle greatly, shortens to 1～2h drying time, has reduced energy consumption, pollution-free, meet the policy guidance of national energy-saving and emission-reduction.
B. low temperature drying.Vacuum environment has reduced the baking temperature of red date, can effectively avoid heat-sensitive ingredients and easy destroyed decomposition of oxidizing component and oxidation reaction in the red date, the infringement product quality.
C. sterilization health.Microwave not only has drying capacity to material, has the effect of disinfection concurrently, and microwave disinfection is the coefficient result of microwave heating effect and non-thermal effect, and the fuel factor of microwave mainly works the bactericidal action that is rapidly heated; Non-thermal effect then uses microbial body internal protein and physiological activator to morph, and devitalization or death, thereby has guaranteed the safety and sanitation of product; Microwave drying need not boiler, haulage vehicle and discarded object and stacks other auxiliary equipment such as field, thereby reduces environmental pollution, can realize pollution-free drying.
D. good product quality.The red date of micro-wave vacuum preparation has kept the original color and luster of bright jujube, and low temperature rapid draing has reduced the loss of fragrance ingredient, and dried red date fragrance is stronger, and flavour is sweet.Can preserve its nutritional labeling effectively, wherein the Vit C contents storage rate reaches 55.63%, and the rehydration of red date is fine.
E. be easy to store.Red date that micro-wave vacuum makes adopts high-barrier composite material to pack, and avoid dried jujube to be easy to the moisture absorption in storage, and the bactericidal effect of microwave is thorough, and sanitary index is higher, insect pest, phenomenon such as mouldy can not occur.
F. suitability for industrialized production.Microwave power has rapid adjustment and mertialess characteristics; be convenient to the adjusting process parameter, control in real time, the drying time of red date is shorter; therefore easily realize continuous industry production and automation control, in the large-scale industrial production of red date drying, have good application prospects.
The advantage of the prepared dry red date of the present invention:
Micro-wave vacuum red date provided by the present invention keeps the original color of red date, shape, active component and nutritional labeling effectively.This product not only can be used as cooks congee or the dietary product of Baoshang, also can be used as the instant food of leisure, and is suitable for and stores and following process.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (8)
1. the preparation method of a dry red date, it is characterized in that, comprise pre-treatment step to red date, pretreated red date is carried out the step of micro-wave vacuum and the step that the red date behind the micro-wave vacuum is packed, the described step that red date is carried out micro-wave vacuum comprises puts into microwave vacuum dryer with red date, red date is carried out the micro-wave vacuum of segmentation, the described micro-wave vacuum step that red date is carried out segmentation comprises carries out drying and later stage drying in early stage to red date, wherein, in the early stage drying, indoor vacuum 2～15kPa keeps dry, microwave power is chosen in 1W/g～5W/g, baking temperature is controlled at below 50 ℃, drying time 10～30min; In the later stage drying, vacuum remains in 2～15kPa scope in the hothouse, and microwave power is reduced to 0.5W/g～3W/g, drying time 20～60min, the water content that is dried to red date is 5%～16%.
2. the preparation method of red date according to claim 1 is characterized in that, described pre-treatment step to red date comprises carries out assortment, cleaning to red date.
3. the preparation method of red date according to claim 2 is characterized in that, also comprises the step that the red date after cleaning is carried out stoning.
4. the preparation method of red date according to claim 1 is characterized in that, in the early stage drying, vacuum remains on 15kPa in the hothouse, and microwave power is 4W/g, and be 10min drying time.
5. the preparation method of red date according to claim 1 is characterized in that, in the later stage drying, vacuum remains on 15kPa in the hothouse, and microwave power is 2.5W/g, and be 26min drying time.
6. the preparation method of red date according to claim 1 is characterized in that, the step that red date is packed comprises that the employing high-barrier composite material packs.
7. the prepared dry red date of the preparation method of the dry red date of a claim 1.
8. dry red date according to claim 7 is characterized in that, the Vit C contents storage rate reaches 55.63% in this drying red date, and water content is between 7～11%.
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| CN2008102405384A CN101438730B (en) | 2008-12-23 | 2008-12-23 | Method for preparing dry red date and red date produced thereby |
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| CN101836671A (en) * | 2010-06-12 | 2010-09-22 | 陕西科技大学 | Method for processing crispy fresh jujube |
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| CN105532847A (en) * | 2016-01-21 | 2016-05-04 | 郑州轻工业学院 | Microwave vacuum freeze drying method for hawthorns |
| CN105783427B (en) * | 2016-04-14 | 2019-06-18 | 华南理工大学 | A kind of microwave vacuum drying method of control by stages |
| CN106839661B (en) * | 2017-03-17 | 2023-05-16 | 优澎（嘉兴）新材料科技有限公司 | Microwave vacuum freeze drying equipment and material drying method |
| CN107484817A (en) * | 2017-08-09 | 2017-12-19 | 刘玉芳 | A kind of preparation method of taro dry plate |
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| CN108783295A (en) * | 2018-05-28 | 2018-11-13 | 义乌凌川科技有限公司 | A kind of processing method of south jujube |
| CN113749230B (en) * | 2021-09-13 | 2023-09-05 | 宁夏润德生物科技有限责任公司 | Preparation method of dried wolfberry fruits |
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