CN108041159A - A kind of processing method of quick-frozen lotus seed - Google Patents

A kind of processing method of quick-frozen lotus seed Download PDF

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Publication number
CN108041159A
CN108041159A CN201711305464.3A CN201711305464A CN108041159A CN 108041159 A CN108041159 A CN 108041159A CN 201711305464 A CN201711305464 A CN 201711305464A CN 108041159 A CN108041159 A CN 108041159A
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China
Prior art keywords
quick
frozen
liquid
lotus
lotus seeds
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Inventor
郭泽镔
赵蓓蓓
郑宝东
林鸿
林雄
孙思薇
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Fujian Agriculture and Forestry University
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Fujian Agriculture and Forestry University
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    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23BPRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00Preservation or chemical ripening of fruit or vegetables
    • A23B7/16Coating with a protective layer; Compositions or apparatus therefor
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23BPRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00Preservation or chemical ripening of fruit or vegetables
    • A23B7/015Preserving by irradiation or electric treatment without heating effect
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23BPRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00Preservation or chemical ripening of fruit or vegetables
    • A23B7/04Freezing; Subsequent thawing; Cooling

Abstract

The present invention relates to a kind of processing method of quick-frozen lotus seed is provided, comprise the following steps:Full grains, the fresh lotus seed of no disease and pests harm are selected, is pre-processed;The ethanol solution that volumetric concentration is 80% is added in into zein powder, then heats while stirring, is then centrifuged for taking supernatant, oleic acid, glyceride and ascorbic acid are added in into supernatant and mixes to obtain complex liquid, refrigeration complex liquid to fluid temperature is 8~12 DEG C;Pretreated lotus seeds are immersed in colour protecting liquid and carry out 5~7min of ultrasonication;Lotus seeds after color retention are immersed into the complex liquid after step 1 refrigerates and carry out film 2min;Lotus seeds after film are carried out using liquid nitrogen flash freezer mode it is quick-frozen, then will be quick-frozen after lotus seeds be vacuum-packed, then cold storage at a temperature of being placed on 15~20 DEG C obtains target product.The processing method of quick-frozen lotus seed of the present invention can effectively prevent quick-frozen lotus seed and brown stain occur in the process of circulation to extend the freshness date of quick-frozen lotus seed.

Description

A kind of processing method of quick-frozen lotus seed
Technical field
The present invention relates to food processing technology field, more particularly to a kind of processing method of quick-frozen lotus seed.
Background technology
Lotus seeds (also known as water sesame pellet, lotus seed, seedpod of the lotus) are the fruits and seeds of Nymphaeceae nelumbium-lotus.From ancient times Since, lotus seeds are widely eaten, the medicine-food two-purpose of high nutritive value and strong health-care efficacy as a kind of high-grade nourishing food among the people Characteristic makes it, and at home and abroad city's field depth is favored by consumer.
Polyphenol oxidase activity is high in fresh lotus seed, and storage phase is very short, easily brown stain.As an improvement, journal article is " quick-frozen Build the research that lotus processing inhibits with polyphenol oxidase activity in storage " colour protecting liquid is used to impregnate 20min with Restrain browning;Shen Number a kind of processing method of quick-frozen fresh lotus please be disclosed for 201010525218.0 Chinese patent, the patent is by lotus seeds through compound Color stabilizer, compound antifreeze use IQF individual quick freezings (- 30 DEG C~-35 DEG C, 8~15min) to prevent quick-frozen fresh lotus from existing after impregnating The brown stain of storage period;The Chinese patent of Application No. 201510569308.2 discloses a kind of fresh-keeping preparation side of fresh lotus seed Method, with high-quality honey and starch be made seasoning smear lotus seeds after be put into -15 DEG C~-24 DEG C refrigerating chamber freezing 8~12 it is small when with Improve the freshness date of fresh lotus.Above-mentioned three kinds of methods and other fresh-retaining preserving techniques, by the way that lotus seeds are carried out with color protection, smearing, quick-frozen The methods of delayed the brown stain of fresh lotus to a certain extent, extend the freshness date of fresh lotus, but IQF individual quick freezings and common quick-frozen jelly It is slow to tie speed, lotus seeds cell and plasm is caused to be damaged, intracellular polyphenol oxidase is escaped after freeze-thaw and led Brown stain is caused, and the juice loss after defrosting can take away part nutriment;Meanwhile quick-frozen lotus seed is in the process of circulation, due to business The browning that field is sold or many reasons such as consumer's buying habit cause quick-frozen lotus seed multigelation occur and generate is not It is effectively solved so that the quality of quick-frozen lotus seed declines in the process of circulation.
The content of the invention
The present invention overcomes drawbacks described above, and it is an object of the present invention to provide a kind of to prevent that quick-frozen lotus seed from occurring in the process of circulation brown The processing method of the quick-frozen lotus seed of change, further to extend the freshness date of quick-frozen lotus seed.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is:
A kind of processing method of quick-frozen lotus seed, comprises the following steps:
Step 1:Full grains, the fresh lotus seed of no disease and pests harm are selected, carries out decladding, striping, obturator processing and cleaning;
The ethanol solution that volumetric concentration is 80% is added in into zein powder, is then heated while stirring, then Centrifuging and taking supernatant adds in oleic acid, glyceride and ascorbic acid into supernatant and mixes to obtain complex liquid, refrigeration complex liquid to liquid Temperature is 8~12 DEG C;
Step 2:By step 1, treated that lotus seeds are immersed in colour protecting liquid and carry out 5~7min of ultrasonication;
Step 3:By step 2, treated that lotus seeds are immersed into that film 2min is carried out in the complex liquid after step 1 refrigerates;
Step 4:Step 3 treated lotus seeds are carried out using liquid nitrogen flash freezer mode it is quick-frozen, then will be quick-frozen after lotus seeds It is vacuum-packed, then cold storage at a temperature of being placed on -15~-20 DEG C, obtain target product.
The beneficial effects of the present invention are:(1) present invention is by the way that ultrasonic combined colour protecting liquid treated lotus seeds are carried out Film, then it is quick-frozen effectively to delay lotus seeds brown stain to the progress of film lotus seeds, and effectively reduce the nutrition leak of lotus seeds so that it is new Fresh lotus seeds quality is maintained at best condition, extends the freshness date of lotus seeds;(2) zeins and glyceride that the present invention uses Good mechanical property, the oxygen barrier fungistatic effect of compelx coating are good, and lotus can be effectively improved while nutritious lotus seed, water loss is prevented The freeze-thaw stability of son, and then effectively prevent lotus seeds from multigelation occur in the follow-up process of circulation and causing oxidizing brown stain;(3) For the present invention using liquid nitrogen flash freezer, freeze-off time is short, treating capacity is big, efficient, can reduce lotus seeds cell and plasm is damaged journey Degree reduces the polyphenol oxidase for causing lotus seeds brown stain and peroxidase (intracellular to generate) effusion, reduces juice loss rate.
Specific embodiment
In order to describe the technical content, the structural feature, the achieved object and the effect of this invention in detail, below in conjunction with embodiment It is explained in detail.
The design of most critical of the present invention is:By pretreated lotus seeds through colour protecting liquid combination ultrasonication, then apply Film improves lotus seeds freeze-thaw stability, and finally with liquid nitrogen flash freezer, to reduce the quick-frozen damage to lotus seeds, speed is prevented to reach for cold storage again Freeze the purpose that brown stain occurs in the process of circulation for lotus seeds.
A kind of processing method of quick-frozen lotus seed, comprises the following steps:
Step 1:Full grains, the fresh lotus seed of no disease and pests harm are selected, carries out decladding, striping, obturator processing and cleaning;
The ethanol solution that volumetric concentration is 80% is added in into zein powder, is then heated while stirring, then Centrifuging and taking supernatant adds in oleic acid, glyceride and ascorbic acid into supernatant and mixes to obtain complex liquid, refrigeration complex liquid to liquid Temperature is 8~12 DEG C;
Step 2:By step 1, treated that lotus seeds are immersed in colour protecting liquid and carry out 5~7min of ultrasonication;
Step 3:By step 2, treated that lotus seeds are immersed into that film 2min is carried out in the complex liquid after step 1 refrigerates;
Step 4:Step 3 treated lotus seeds are carried out using liquid nitrogen flash freezer mode it is quick-frozen, then will be quick-frozen after lotus seeds It is vacuum-packed, then cold storage at a temperature of being placed on -15~-20 DEG C, obtain target product.
The principle of the present invention:Pretreated fresh lotus seed is handled through colour protecting liquid combining ultrasonic ripple, in the same of inactive enzyme When promote lotus seeds to the absorption of colour protecting liquid to delay the brown stain of lotus seeds, reduce soaking time to reduce nutritious lotus seed substance in color protection The loss in stage, while contribute to during later stage film edible film in the adherency on lotus seeds surface to improve film effect, color protection Calcium chloride in liquid can reduce freezing point as antifreeze;Ultrasonic wave is aided in the lotus seeds after color retention carry out above-mentioned complex liquid painting Film oxygen barrier to prevent the loss of nutritional ingredient in lotus seeds, flavor, moisture, meanwhile, the lotus seeds freeze thawing after above-mentioned complex liquid film Stability significantly improves, and can effectively alleviate in the follow-up lotus seeds process of circulation and oxidizing brown stain caused by multigelation occurs;And incite somebody to action Lotus seeds after film are again with cold storage again after liquid nitrogen flash freezer (- 110 DEG C), relative monomer quick-frozen (- 38 DEG C) and common quick-frozen (- 18 DEG C) For, freeze-off time is short, efficient, can reduce lotus seeds cell and plasm is damaged degree, reduction causes the more of lotus seeds brown stain Phenol oxidase and peroxidase (intracellular to generate) escape, reduction juice loss, all linked with one another between above steps, so that It obtains lotus seeds quality and is maintained at best condition.
As can be seen from the above description, the beneficial effects of the present invention are:(1) present invention is by will be at ultrasonic combined colour protecting liquid Lotus seeds after reason carry out film, then quick-frozen effectively to delay lotus seeds brown stain to the progress of film lotus seeds, and effectively reduce lotus seeds Nutrition leak so that fresh lotus seed quality is maintained at best condition, extends the freshness date of lotus seeds;(2) corn that the present invention uses Good mechanical property, the oxygen barrier fungistatic effect of alcohol soluble protein and glyceride compelx coating be good, is preventing nutritious lotus seed, water loss The freeze-thaw stabilities of lotus seeds can be effectively improved simultaneously, so effectively prevent lotus seeds from occurring multigelation in the follow-up process of circulation and Cause oxidizing brown stain;(3) for the present invention using liquid nitrogen flash freezer, freeze-off time is short, treating capacity is big, efficient, can reduce lotus seeds cell Degree is damaged with plasm, reduces the polyphenol oxidase for causing lotus seeds brown stain and peroxidase (intracellular to generate) effusion, Reduce juice loss rate.
Further, in step 1, the solid-liquid ratio of zein powder and ethanol solution is 1: 8~12, the list of solid-liquid ratio Position is g/mL;The additive amount of the oleic acid is 35~45wt% of the zein powder;The additive amount of the glyceride For 55~65wt% of the zein powder;The content of the ascorbic acid for the complex liquid 0.15~ 0.25wt%.
Seen from the above description, the complex liquid that aforementioned proportion component is prepared into, mechanical performance is optimal, and can further improve The freeze-thaw stability of later stage film lotus seeds.
Further, mode of heating is heating water bath in step 1, and the temperature of heating is 55~65 DEG C, and the time of heating is 18~22min.
Seen from the above description, using heating water bath zein powder can be allowed more sufficiently and uniformly to be dissolved in Ethanol solution, heating is more uniform, and temperature and time is controlled in above range, avoids the too high destruction zeins of temperature Structure and influence later stage film effect.
Further, the mixing in step 1 carries out homogeneous mixing using homogenizer.
Seen from the above description, mixed using homogeneous, avoid the occurrence of liquid layered so that the abundant mixing of complex liquid each component To improve follow-up film effect.
Further, propylgallate, citric acid and calcium chloride, the nutgall are contained in the colour protecting liquid in step 2 The content of propyl propionate is 0.003~0.005wt% of the colour protecting liquid, the content of the citric acid is the colour protecting liquid 0.4 ~0.6wt%, the content of the calcium chloride are 0.1~0.3wt% of the colour protecting liquid.
Seen from the above description, the characteristic according to lotus seeds in itself selects above-mentioned colour protecting liquid to lotus seeds color protection, relatively common fruit Vegetable colour protecting liquid, above-mentioned colour protecting liquid are optimal to the effect of color protection of lotus seeds.
Further, the concrete operations of step 4 are:Step 3 treated lotus seeds are placed in tunnel type liquid nitrogen flash freezer machine- Quick-frozen 6-8min is carried out under the conditions of 110 DEG C, then will be quick-frozen after lotus seeds be vacuum-packed, then be placed on -15~-20 DEG C of temperature Lower cold storage, obtains target product.
Seen from the above description, lotus seeds are handled using tunnel type liquid nitrogen flash freezer machine, treating capacity is big and quick-frozen efficiency Height, can effectively reduce lotus seeds cell and plasm is damaged degree, reduce polyphenol oxidase and the peroxidating for causing lotus seeds brown stain Object enzyme (intracellular to generate) effusion, reduces juice loss rate.
Further, in step 2 power of ultrasonication for 750~850W, the frequency of ultrasonication for 20~ 30kHz controls the temperature of colour protecting liquid below 40 DEG C.
Seen from the above description, by the power of ultrasonication, the frequency of ultrasonication and colour protecting liquid during color protection Temperature is controlled in above range, absorbs colour protecting liquid effectively facilitating lotus seeds, color protection is avoided while shortening colour protecting liquid soaking time Process causes the brown stain of lotus seeds or increases the loss of nutritious lotus seed ingredient.
Embodiment 1
Materials and methods
1. material
Fresh lotus seed, zein powder, ethyl alcohol, oleic acid, glyceride, ascorbic acid, propylgallate, lemon Acid, calcium chloride, guaiacol, hydrogen peroxide, catechol;
2. key instrument
DHH1-GYB types homogenizer westernization instrument (Beijing) Science and Technology Ltd.
KQ5200DE type numerical control ultrasonic cleaners Kunshan Ultrasonic Instruments Co., Ltd.
SD-X-1200 tunnel type liquid nitrogen flash freezer machine Ke Weijiani (Beijing) Science and Technology Ltd.
ZDQ400/2 single-chamber vacuum machine Wenzhou City Xin Da package packing machinies factory
BC/BD-272SE Haier ice box
3. test method
A kind of processing method of quick-frozen lotus seed, comprises the following steps:
Step 1:Full grains, the fresh lotus seed of no disease and pests harm are selected, carries out decladding, striping, obturator processing and cleaning;
The ethanol solution that volumetric concentration is 80% is added in into zein powder, and (zein powder is molten with ethyl alcohol The solid-liquid ratio of liquid is 1: 8, unit g/mL), it is then placed in 55 DEG C of water-bath and heats 22min while stirring, Ran Houyu 20min is centrifuged under the rotating speed of 4000r/min, takes supernatant, oleic acid is added in into supernatant, and (additive amount is zein powder The 35wt% of dosage), (additive amount is multiple for glyceride (additive amount is the 55wt% of zein powder dosage) and ascorbic acid Close liquid 0.15wt%) homogeneous mix complex liquid (actual use, can according to submergence lotus seeds needed for amount, by above-mentioned each component Ratio, which expands, prepares complex liquid), refrigeration complex liquid to fluid temperature is 8 DEG C;
Step 2:By step 1, treated that lotus seeds are immersed in the colour protecting liquid (nutgall that the colour protecting liquid contains 0.003wt% Propyl propionate, the colour protecting liquid contain the citric acid of 0.4wt%, the calcium chloride that the colour protecting liquid contains 0.1wt%) in and surpassed Sonicated (power of ultrasonication is 850W, the frequency of ultrasonication is 20kHz, and colour protecting liquid temperature is 25 DEG C) 5min;
Step 3:By step 2, treated that lotus seeds are immersed into that film 2min is carried out in the complex liquid after step 1 refrigerates;
Step 4:By step 3 treated lotus seeds are placed in tunnel type liquid nitrogen flash freezer machine under the conditions of -110 DEG C carry out it is quick-frozen 6min, then will be quick-frozen after lotus seeds be vacuum-packed, then cold storage at a temperature of being placed on -18 DEG C obtains target product.
4. the evaluation method of quick-frozen fresh lotus quality
The measure of 4.1 enzyme activities
Using the remnant enzyme activity of peroxidase (POD) and polyphenol oxidase (PPO) as index.
1) preparation of peroxidase POD enzyme solutions:Defrosting lotus seeds are poured into agitator for food-making, with 1:The solid-liquid ratio of 2g/ml Phosphate buffer, grinding filtering are added in, then filtrate is centrifuged by 15min with 7000r/min rotating speeds, takes supernatant.
It is prepared by reaction solution:The phosphate buffer solution that 6.5 concentration of pH is 0.1M is prepared, is refrigerated in 4 DEG C of refrigerators.Take 50ml For buffer solution in beaker, addition 28ul guaiacol heating stirrings are uniform, add 30% hydrogen peroxide of 19ul, are uniformly mixed After pour into vial and preserved in 4 DEG C of refrigerators.
POD enzyme activity determinations:Above-mentioned reaction solution 3ml and 1ml buffer solutions are taken in 10mm optical path cuvettes, as absorbance pair According to.Another 1 cuvette adds in 3ml reaction solutions and 1ml lotus seeds extraction enzyme solution, and after stirring evenly, extinction is measured under 470nm wavelength Degree.3 parallel tests are done altogether.Last enzyme activity is characterized with the average value of absorbance, and calculates residual enzyme using formula (1) It is living.
RA (%)=AX/A0 × 100% (1)
In formula, AX is the enzyme activity of sample after pretreatment, and A0 is the initial enzyme activity of fresh sample
2) preparation of polyphenol oxidase PPO enzyme solutions:With POD enzyme solution preparation methods.
It is prepared by reaction solution:0.1M catechol solution is prepared, is put into vial and is preserved in 4 DEG C of refrigerators.
PPO enzyme activity determinations:Phosphate buffer, catechol solution are preheated in 30 DEG C of thermostat water baths in advance.Than 1.6ml buffer solutions, 1.2ml catechols solution and 0.2 lotus seeds enzyme solution are added in color ware.After stirring evenly, in 420nm wavelength Lower measure absorbance.3 parallel tests are done altogether.Last enzyme activity is characterized with the average value of absorbance, and is counted using formula (1) Calculate remnant enzyme activity.
The assay method of 4.2 subjective appreciations
1 quick-frozen lotus seed subjective appreciation index of table
Measured result is repeated three times, and takes average, and test data carries out processing analysis with SPSS13.0 statistical softwares, The evaluation result of quick-frozen lotus seed quality is shown in Table 2.
Embodiment 2
Other with embodiment 1, the difference is that, test method is specific as follows:
A kind of processing method of quick-frozen lotus seed, comprises the following steps:
Step 1:Full grains, the fresh lotus seed of no disease and pests harm are selected, carries out decladding, striping, obturator processing and cleaning;
The ethanol solution that volumetric concentration is 80% is added in into zein powder, and (zein powder is molten with ethyl alcohol The solid-liquid ratio of liquid is 1: 10, unit g/mL), it is then placed in 60 DEG C of water-bath and heats 20min while stirring, Ran Houyu 20min is centrifuged under the rotating speed of 4000r/min, takes supernatant, oleic acid is added in into supernatant, and (additive amount is zein powder The 40wt% of dosage), (additive amount is multiple for glyceride (additive amount is the 60wt% of zein powder dosage) and ascorbic acid Close liquid 0.20wt%) homogeneous mix complex liquid (actual use, can according to submergence lotus seeds needed for amount, by above-mentioned each component Ratio, which expands, prepares complex liquid), refrigeration complex liquid to fluid temperature is 10 DEG C;
Step 2:By step 1, treated that lotus seeds are immersed in the colour protecting liquid (nutgall that the colour protecting liquid contains 0.004wt% Propyl propionate, the colour protecting liquid contain the citric acid of 0.5wt%, the calcium chloride that the colour protecting liquid contains 0.2wt%) in and surpassed Sonicated (power of ultrasonication is 800W, the frequency of ultrasonication is 25kHz, and colour protecting liquid temperature is 30 DEG C) 6min;
Step 3:By step 2, treated that lotus seeds are immersed into that film 2min is carried out in the complex liquid after step 1 refrigerates;
Step 4:By step 3 treated lotus seeds are placed in tunnel type liquid nitrogen flash freezer machine under the conditions of -110 DEG C carry out it is quick-frozen 7min, then will be quick-frozen after lotus seeds be vacuum-packed, then cold storage at a temperature of being placed on -18 DEG C obtains target product.
The evaluation method of quick-frozen lotus seed quality is identical with implementing 1, and the evaluation result of quick-frozen lotus seed quality is shown in Table 2.
Embodiment 3
Other with embodiment 1, the difference is that, test method is specific as follows:
A kind of processing method of quick-frozen lotus seed, comprises the following steps:
Step 1:Full grains, the fresh lotus seed of no disease and pests harm are selected, carries out decladding, striping, obturator processing and cleaning;
The ethanol solution that volumetric concentration is 80% is added in into zein powder, and (zein powder is molten with ethyl alcohol The solid-liquid ratio of liquid is 1: 12, unit g/mL), it is then placed in 65 DEG C of water-bath and heats 18min while stirring, Ran Houyu 20min is centrifuged under the rotating speed of 4000r/min, takes supernatant, oleic acid is added in into supernatant, and (additive amount is zein powder The 45wt% of dosage), (additive amount is multiple for glyceride (additive amount is the 65wt% of zein powder dosage) and ascorbic acid Close liquid 0.25wt%) homogeneous mix complex liquid (actual use, can according to submergence lotus seeds needed for amount, by above-mentioned each component Ratio, which expands, prepares complex liquid), refrigeration complex liquid to fluid temperature is 12 DEG C;
Step 2:By step 1, treated that lotus seeds are immersed in the colour protecting liquid (nutgall that the colour protecting liquid contains 0.005wt% Propyl propionate, the colour protecting liquid contain the citric acid of 0.6wt%, the calcium chloride that the colour protecting liquid contains 0.3wt%) in and surpassed Sonicated (power of ultrasonication is 750W, the frequency of ultrasonication is 30kHz, and colour protecting liquid temperature is 35 DEG C) 7min;
Step 3:By step 2, treated that lotus seeds are immersed into that film 2min is carried out in the complex liquid after step 1 refrigerates;
Step 4:By step 3 treated lotus seeds are placed in tunnel type liquid nitrogen flash freezer machine under the conditions of -110 DEG C carry out it is quick-frozen 8min, then will be quick-frozen after lotus seeds be vacuum-packed, then cold storage at a temperature of being placed on -18 DEG C obtains target product.
The evaluation method of quick-frozen lotus seed quality is identical with implementing 1, and the evaluation result of quick-frozen lotus seed quality is shown in Table 2.
Comparative example
Quick-frozen fresh lotus preparation process:
(1) fresh lotus harvesting:Using fresh lotus as raw material, select seed material full, uniform in size, no disease and pests harm fresh lotus seed;
(2) pre-process:Decladding, striping, obturator are handled, and are cleaned into the water after obturator, drained and standby;
(3) cryogenic vacuum perfusion, dipping precooling:It mixes, makes after composite color fixative, compound antifreeze are distinguished dissolution filter It into dipping precooling liquid, then injects in vacuum pre-cooling tank after being cooled to 1 DEG C~5 DEG C, is then put into pretreated fresh lotus very In empty precooling tank;It impregnates precooling liquid and carries out cryogenic vacuum perfusion, the dipping precooling of fresh lotus, vacuum parameters:Vacuum degree -0.08Mpa~ 0.09Mpa, 1 DEG C~5 DEG C, 10~20min of time of temperature are drained after dipping;
(4) it is quick-frozen:Using IQF individual quick freezings, -30 DEG C~-35 DEG C, 8~15min of freeze-off time of quick freezing temperature, until fresh lotus Central temperature reaches less than -18 DEG C, obtains quick-frozen fresh lotus;
(5) pack:Quick-frozen fresh lotus is packed into composite plastic package bag, vacuum seal;
(6) cold storage:It is preserved in less than -18 DEG C Freezing rooms.
The evaluation method of quick-frozen lotus seed quality is identical with implementing 1, and the evaluation result of quick-frozen lotus seed quality is shown in Table 2.
The evaluation result of 2 several quick-frozen lotus seed qualities of table
Quick-frozen fresh lotus Remaining POD activity Remaining PPO activity Sensory evaluation scores
Embodiment 1 15.03 ± 0.33% 16.37 ± 0.29% 87.16±0.52
Embodiment 2 12.41 ± 0.21% 14.56 ± 0.11% 89.53±0.35
Embodiment 3 10.16 ± 0.51% 12.12 ± 0.30% 92.05±0.27
Comparative example 34.64 ± 0.46% 39.33 ± 0.21% 62.33±0.65
From table 2 it can be seen that using the remaining peroxidase (POD) in the quick-frozen lotus seed of the method for the present invention processing and The enzyme activity of the residual enzyme of polyphenol oxidase (PPO) is substantially less than the lotus seeds of comparative example, and sensory evaluation scores are significantly higher than comparative example, show The quick-frozen lotus seed quality of the method for the present invention processing is substantially better than lotus seeds made from comparative example method.
In conclusion the processing method of quick-frozen lotus seed provided by the invention, by will be after the processing of ultrasonic combined colour protecting liquid Lotus seeds carry out film, then film lotus seeds are carried out with nutrition that is quick-frozen effectively to delay lotus seeds brown stain, and effectively reducing lotus seeds It is lost in so that fresh lotus seed quality is maintained at best condition, extends the freshness date of lotus seeds;The zeins that the present invention uses Good mechanical property, oxygen barrier fungistatic effect with glyceride compelx coating is good, can have while nutritious lotus seed, water loss is prevented Effect improves the freeze-thaw stability of lotus seeds, and then effectively prevents lotus seeds from multigelation occur in the follow-up process of circulation and causing oxidation Brown stain;For the present invention using liquid nitrogen flash freezer, freeze-off time is short, treating capacity is big, efficient, can reduce lotus seeds cell and plasm is damaged Hinder degree, reduce the polyphenol oxidase for causing lotus seeds brown stain and peroxidase (intracellular to generate) effusion, reduce juice loss Rate.
The foregoing is merely the embodiment of the present invention, are not intended to limit the scope of the invention, every to utilize this hair The equivalent structure or equivalent flow shift that bright description is made directly or indirectly is used in other relevant technology necks Domain is included within the scope of the present invention.

Claims (7)

1. a kind of processing method of quick-frozen lotus seed, which is characterized in that comprise the following steps:
Step 1:Full grains, the fresh lotus seed of no disease and pests harm are selected, carries out decladding, striping, obturator processing and cleaning;
The ethanol solution that volumetric concentration is 80% is added in into zein powder, then heats, is then centrifuged for while stirring Supernatant is taken, oleic acid, glyceride and ascorbic acid are added in into supernatant and mixes to obtain complex liquid, refrigeration complex liquid to fluid temperature For 8~12 DEG C;
Step 2:By step 1, treated that lotus seeds are immersed in colour protecting liquid and carry out 5~7min of ultrasonication;
Step 3:By step 2, treated that lotus seeds are immersed into that film 2min is carried out in the complex liquid after step 1 refrigerates;
Step 4:Step 3 treated lotus seeds are carried out using liquid nitrogen flash freezer mode it is quick-frozen, then will be quick-frozen after lotus seeds carry out Vacuum packaging, then cold storage at a temperature of being placed on -15~-20 DEG C, obtain target product.
2. the processing method of quick-frozen lotus seed according to claim 1, which is characterized in that in step 1, zein powder Solid-liquid ratio with ethanol solution is 1: 8~12, and the unit of solid-liquid ratio is g/mL;The additive amount of the oleic acid is molten for the corn alcohol 35~45wt% of albumen powder;The additive amount of the glyceride is 55~65wt% of the zein powder;It is described anti- The content of bad hematic acid is 0.15~0.25wt% of the complex liquid.
3. the processing method of quick-frozen lotus seed according to claim 1, which is characterized in that mode of heating is water-bath in step 1 Heating, the temperature of heating is 55~65 DEG C, and the time of heating is 18~22min.
4. the processing method of quick-frozen lotus seed according to claim 1, which is characterized in that the mixing in step 1 is using equal Matter machine carries out homogeneous mixing.
5. the processing method of quick-frozen lotus seed according to claim 1, which is characterized in that contain in the colour protecting liquid in step 2 Propylgallate, citric acid and calcium chloride, the content of the propylgallate for the colour protecting liquid 0.003~ 0.005wt%, 0.4~0.6wt% that the content of the citric acid is the colour protecting liquid, the content of the calcium chloride is the shield 0.1~0.3wt% of color liquid.
6. the processing method of quick-frozen lotus seed according to claim 1, which is characterized in that the concrete operations of step 4 are:Step 3 treated that lotus seeds are placed in tunnel type liquid nitrogen flash freezer machine that quick-frozen 6-8min is carried out under the conditions of -110 DEG C, then will be quick-frozen after Lotus seeds be vacuum-packed, then cold storage at a temperature of being placed on -15~-20 DEG C obtains target product.
7. the processing method of quick-frozen lotus seed according to claim 1, which is characterized in that the work(of ultrasonication in step 2 Rate is 750~850W, and the frequency of ultrasonication is 20~30kHz, controls the temperature of colour protecting liquid below 40 DEG C.
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