Background technology
What the processing of tradition bean vermicelli was adopted substantially is extrusion modling, the production technology of natural aging, and because of temperature, changes of seasons difference, technological parameter will be adjusted with this explained hereafter bean vermicelli.Wherein the natural aging time long, generally more than 24 hours.Studies show that, because molecular motion is slowed down, this moment, all turned one's head to tend to and be arranged in parallel, and draws close mutually by the branch of amylose molecule and amylopectin molecule when temperature reduces for the starch molecule of gelatinization in the ageing process of starch, with the hydrogen bond combination, reformulate the mixed microcrystalline bundle each other.
Think at present, adopt freezing aging technique not only can shorten the goods time, also can keep the nutritional labeling in the bean vermicelli, and bean vermicelli becomes sparkling and crystal-clear after the freeze thawing dehydration, transparency is obviously than natural aging bean vermicelli height, anti-ly boils, anti-ly chews, mouthfeel improves.But determining of freezing aging condition is a big technical barrier of this area.
Disclosed method is freezing at least 12 hours an of temperature to be not less than-8 ℃ in CN03141951.8 " multi-flavour vermicelli and production method thereof ", thaws at least 12 hours, and is consuming time longer, and power consumption is high.
Disclosed method is after the powder slurry is boiled in CN91101349.0 " technique for making vermicelli made from bean starch by quick-freezing method ", the wet-milling silk is put in 15 ℃ the dilute slurry and lowers the temperature, then in 30~60 minutes, rapidly bean vermicelli is cooled to-20 ℃~-30 ℃, take out vermicelli through 30~60 minutes freezing back again, be placed in the warm water about 30 ℃ and thaw, dry at last.The freezing aging step complexity of this method freezing equipment is required height, and energy-output ratio is huge, and the cost height is difficult to actual popularization.
Though cool aging is arranged and steam the step of starching, concrete parameter and actual effect are not disclosed at CN200510047674.8 " a kind of preparation method of boil proof vermicelli without alum ".
Therefore the freezing aging technique temperature that generally adopt present this area is low excessively, the processing time is long, causes energy consumption excessive, and is also very high to the requirement of refrigeration plant; In addition, the step because the independent intensification of needs is thawed has also increased extra cost.In order to overcome above-mentioned shortcoming, this area be badly in need of developing weak point consuming time, power consumption less, the technology of freezing aging preparation vermicelli instant food low for equipment requirements.
In addition, present vermicelli instant food all contains various food additives, and a kind of vermicelli instant food that does not contain additive also is badly in need of developing in this area.
Summary of the invention
The technical problem that the present invention will solve provide a kind of weak point consuming time, power consumption less, freezing aging preparation preparation method of vermicelli instant food low for equipment requirements.The inventive method may further comprise the steps: a, preparation raw material; B, size mixing; C, stand slurry; D, steam starch bean sheet jelly; E, with bean sheet jelly precooling at ambient temperature; F, with the bean sheet jelly after the precooling-8~-1 ℃ of following freezing processing 1.5~2 hours; G, the bean sheet jelly after the freezing processing is cut off, drying, finished product.
Wherein, the raw material proportioning of using among the said method step a is: starch from sweet potato 60~80 weight portions, farina 15~25 weight portions, cornstarch 5~15 weight portions.
Wherein, sizing mixing described in the said method step b mixes for raw material being added water that to size mixing into concentration be 22~26
0The powder slurry of Be.
Wherein, the slurry of the stand described in said method step c thickness is 1.0~1.3mm.
Wherein, steaming the condition of starching described in the said method steps d is to descend 3~5 minutes at 90~100 ℃.
Wherein, before the freezing processing described in the said method step e, will steam the bean sheet jelly precooling 1.5~2.5 hours of slurry gained.
Another technical problem that the present invention will solve provides a kind of vermicelli instant food that does not contain harmful additive.Vermicelli instant food of the present invention is preparation-obtained by said method.
Further, above-mentioned vermicelli instant food is bean vermicelli, bean sheet jelly or vermicelli.
Present research is thought, the ageing process of starch is that the starch molecule of gelatinization slows down owing to molecular motion when temperature reduces, and this moment, the branch of amylose molecule and amylopectin molecule all turned one's head to tend to and be arranged in parallel, and drew close mutually, with the hydrogen bond combination, reformulate the mixed microcrystalline bundle each other.And in the instant bean vermicelli preparation process, adopt suitable freezing aging technique not only can shorten the goods time, and also can keep the nutritional labeling in the bean vermicelli, and bean vermicelli becoming sparkling and crystal-clear after the freeze thawing dehydration, transparency is obviously than natural aging bean vermicelli height, and mouthfeel improves.But determining of freezing aging condition is a big technical barrier of this area, and by the parameter of freezing aging condition and associated process steps screened determine just by the back for the inventive method.
Whether the concrete steps and the key points for operation of the inventive method are as follows: take by weighing raw materials such as Ipomoea batatas, potato, cornstarch by formula for a product, use additive then according to the prescription requirement.Can start agitating device during with slurry, at the uniform velocity add raw material and water, itself and slurry amount are no more than 4/5 of agitator tank volume and are advisable, and the concentration of powder slurry is 22 as requested
0Be~25
0Be is preferably 23
0Be~24
0Be.The powder slurry that to become reconciled is coated with starching according to actual conditions adjustment stand slurry thickness, generally at 1.0~.1.3mm. stand slurry width is decided according to the width of conveyer belt, generally at 1000 ± 50mm.Steaming slurry temperature is set between 85~100 ℃ and (is preferably 90~100 ℃), and attention makes powder slurry heat absorption equilibrium, and ripe degree is consistent, and the steaming slurry time generally is controlled at about 3~5min.The bean sheet jelly that comes out from the steaming pulp grinder must pass through precooling, and chilling temperature can be that room temperature (also can use axial flow blower to assist precooling in process of production) is 1.5~2 hours in the time of winter-spring season precooling; In the time of summer and autumn precooling is 2~2.5 hours, and the effect of precooling is to dry up the bean sheet jelly surface moisture, reduces viscosity, is convenient to slitting, and the temperature of precooling is preferable under generally being controlled at 16~26 ℃.After the cooling, temperature reduces, and makes age of starch, can avoid bean sheet jelly too soft, keeps bean sheet jelly to have good mouthfeel and smooth degree.Bean sheet jelly freezing processing in refrigeration system is finished the process of age of starch, and age of starch is relevant with temperature and time, and the refrigeration system temperature is set at-8~1 ℃; The freezing time is 1.5~2 hours.Bean sheet jelly after freezing (burin-in process), its width are that its length of 1000 ± 20mm. is continuously, need to cut off, the requirement otch is straight, notice during cut-out that conveyer belt can not wander off, and notice that the cutting knife mouth should regularly brush oil, so that make adhesion between otch and the bean sheet jelly.Width that cuts off and length determine that with the needs of different product general instant bean vermicelli is that 3.5 ± 0.5mm is wide, and 250 ± 20mm is long, and bean sheet jelly and vermicelli all cut off by specification separately.Final product carries out drying for 30 ℃~70 ℃, makes moisture content of finished products be controlled at 12 ± 2%, must not produce crisp, the fracture, variable color and spoiled phenomenon, finished product is tested, qualified warehouse-in.
Beneficial effect of the present invention is: the inventive method is easy, efficient, time of burin-in process is shortened dramatically, and since preferred to suitable freezing processing temperature and time, the time and the energy saved than prior art; The inventive method need not beaten Gorgon euryale, does not need to thaw, even can not use any additives; Because showing, the technology of the steaming sheet slaking that employing is optimized, bean sheet jelly gelatinization degree height, the rehydration time when making product edible shortens.The vermicelli instant food outward appearance of the inventive method preparation is sparkling and crystal-clear, and the transparency height anti-ly boils, anti-ly chews, mouthfeel is good, and does not contain any additives, has splendid foodsafety, is that a big innovation in vermicelli instant food field breaks through.
The specific embodiment of form is described in further detail foregoing of the present invention again by the following examples.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following example.All technology that realizes based on foregoing of the present invention all belong to scope of the present invention.
The specific embodiment
Embodiment one: the inventive method prepares vermicelli instant food
1, batching
Preparation raw material starch from sweet potato (accounting for 70 weight portions), farina (accounting for 20 weight portions), cornstarch (accounting for 10 weight portions) prepare the 100kg instant bean vermicelli by following step.
2, size mixing
Agitator tank injects 10% running water that accounts for the total water amount earlier and starts agitating device then, at the uniform velocity adds raw material and water, and making the concentration of powder slurry is 23
0Be '.
3, coating starching
Spread out slurry on conveying device, according to the width of conveyer belt, stand slurry width is 1000mm. ± 50mm, and thickness is 1.0 ± 0.2mm.
4, steam slurry
Steam slurry 3.5min down at 94 ℃.
5, precooling
Precooling at ambient temperature.
6, freezing
Cryogenic temperature is-3 ℃, 1.8 hours time.
7, fixed length chopping
The width 3.5mm that cuts off, shearing length is 250mm.
8, drying
Conventional drying to moisture be 12% the instant bean vermicelli finished product, warehouse-in is up to the standards.
Embodiment two: the preparation of vermicelli instant food of the present invention
1, batching
Preparation raw material starch from sweet potato (accounting for 60 weight portions), farina (accounting for 25 weight portions), cornstarch (accounting for 15 weight portions) prepare the 100kg instant bean vermicelli by following step.
2, size mixing
Agitator tank injects 10% running water that accounts for the total water amount earlier and starts agitating device then, at the uniform velocity adds raw material and water, and making the concentration of powder slurry is 24
0Be
3, coating starching
Spread out slurry on conveying device, according to the width of conveyer belt, stand slurry width is 1000mm. ± 50mm, and thickness is 1.0 ± 0.2mm.
4, steam slurry
Steam slurry 2.8min down at 96 ℃.
5,5, precooling
In the room temperature condition precooling, its temperature is: 23 ℃, and the time: 1.8 hours.
5, freezing
Cryogenic temperature is-1 ℃, 2 hours time.
6, fixed length chopping
The width 3.0mm that cuts off, shearing length is 280mm.
7, drying
Conventional drying to moisture be 11% the instant bean vermicelli finished product, warehouse-in is up to the standards.
Embodiment three: the preparation of vermicelli instant food of the present invention
1, batching
Preparation raw material starch from sweet potato (accounting for 80 weight portions), farina (accounting for 15 weight portions), cornstarch (accounting for 5 weight portions) prepare the 100kg instant bean vermicelli by following step.
2, size mixing
Agitator tank injects 10% running water that accounts for the total water amount earlier and starts agitating device then, at the uniform velocity adds raw material and water, and making the concentration of powder slurry is 23
0Be '
3, coating starching
Spread out slurry on conveying device, according to the width of conveyer belt, stand slurry width is 1000mm. ± 50mm, and thickness is 1.0 ± 0.2mm.
4, steam slurry
Steam slurry 3min down at 100 ℃.
5, precooling
Precooling at ambient temperature.
6, freezing
Cryogenic temperature is-8 ℃, 1.5 hours time.
7, fixed length chopping
The width 3.5mm that cuts off, shearing length is 250mm.
8, drying
Conventional drying to moisture be 12% the instant bean vermicelli finished product, warehouse-in is up to the standards.
Test example one is steamed the parameter screening that slurry is handled
Press the design of the steaming slurry temperature and time in the table 1, the parameter screening of steaming sizing process.Except that steaming the slurry processing, the technological parameter of other step is consistent with embodiment one.
Table 1 steams the screening of slurry temperature and time
Experimental result is as follows:
Experiment A: steaming slurry temperature is low, turns over white after the finished product rehydration.
Experiment B: steaming slurry temperature is low, and bean sheet jelly is slaking fully.
Experiment C: steam slurry time weak point, bean sheet jelly is slaking not.
Experiment D: it is suitable to steam the slurry time-temperature, and finished product is good.
Experiment E: it is suitable to steam the slurry time-temperature, and finished product is good.
Experiment F: it is suitable to steam the slurry time-temperature, and finished product is good.
Experiment G: it is suitable to steam the slurry time-temperature, and finished product is good.
Very poor from the experiment effect of result of experiment: A, B, C, and its finished product of remaining experimental result meets the requirements.The inventive method is screened and determine to be steamed 90~100 ℃ of conditions that slurry handles 3~5 minutes down.
The parameter screening of test example two freezing processing
Under the situation that other technological parameter is determined, the temperature and time parameter of freezing processing is carried out preferably.
At first, carry out the screening (seeing Table 2) of precooling treatment temperature and time, detect evaluation by two requirements of test example.
The screening experiment of table 2 precooling treatment temperature and time
Experiment A: the temperature height, the time is short, does not have cool to room temperature, and yield rate is low
Experiment B: the time is short, not aging not finishing, and yield rate is low.
Experiment C: thoroughly aging, the yield rate height.
Experiment D: thoroughly aging, the yield rate height.
Experiment E: thoroughly aging, the yield rate height.
Experiment F: thoroughly aging, the yield rate height.
Experiment G: the time is long, and temperature is low, and yield rate is low, and effect is bad.
Very poor from the experiment effect of result of experiment: A, B, G, and its finished product of remaining experimental result meets the requirements.The optimum condition that the inventive method is screened is: precooling is 1.5~2.5 hours under 16~26 ℃ room temperature.
The screening experiment of table 3 cryogenic temperature and time
Secondly, carry out the technological parameter screening (seeing Table 3) of freezing processing, detect evaluation by two requirements of test example.
Experimental result:
Experiment A: temperature is low excessively, and finished product is bad.
Experiment B: temperature is low excessively, wears out and finishes substantially, and finished product is better.
Experiment C: temperature is lower, wears out and finishes substantially, and finished product is better.
Experiment D: time-temperature is suitable, aging finishing, and finished product is good.
Experiment E: time-temperature is suitable, aging finishing, and finished product is good.
Experiment F: time-temperature is suitable, aging finishing, and finished product is good.
Experiment G: time-temperature is suitable, aging finishing, and finished product is good.
Very poor from the experiment effect of result of experiment: A, the experimental result of B, C is better, and its finished product of remaining experimental result meets the requirements.The freezing processing parameter that the inventive method is screened is preferably at-6~-1 ℃ and handled 1.5~2 hours down for-8~-1 ℃ of following freezing processing 1.5~2 hours.
The detection of test example two bean vermicelli series products of the present invention
Press DB51/T-413 " instant bean vermicelli "; The requirement of NY5788 " pollution-free food bean vermicelli " detects the vermicelli instant food of each examples preparation.And to the rehydration time of product of preparation gained, whether adhesion, muddy soup whether, whether number of bubbles is more, and whether whether delicious along sliding facilitation slag, taste outward appearance (transparency, whiteness) and mouthfeel many indexs such as (toughness, softness) carries out comprehensive evaluating (leading indicator is referring to table 4).
Table 4 detects index
Project |
Index |
Color and luster |
Be the due color and luster of uniform milky, white or product. |
Flavour and smell |
Flavour and smell are normal, free from extraneous odour |
Form |
Even thickness, profile is more neat, does not have doubling, no broken silk substantially. |
Rehydration |
Rehydration time obviously shortens does not have obviously disconnected bar, drafting after the rehydration, and mouthfeel is not half-cooked, do not stick to one's teeth, do not have the sense of sand tooth |
Impurity |
There is not other visible impurity |
Experimental result shows that the prepared bean vermicelli series products of the embodiment of the invention all meets the requirements.And quality softness, toughness are strong, good springiness, anti-ly boil, non muddy soup, adhesion; Smooth good to eat, the delicious flavour of mouthfeel is subjected to taster's consistent favorable comment.
By above-mentioned example as can be known, the inventive method the inventive method need not beaten Gorgon euryale, need not thaw yet, even can not use any additives, and is easy, efficient, saved the time and the energy greatly than prior art, reduced production cost; Because showing, the technology of the steaming sheet slaking that employing is optimized, bean sheet jelly gelatinization degree height, the rehydration time when making product edible shortens.The vermicelli instant food outward appearance of the inventive method preparation is sparkling and crystal-clear, and the transparency height anti-ly boils, anti-ly chews, mouthfeel is good, and does not contain any additives, and preparation cost is cheap, has the very strong market competitiveness, is a quantum jump in vermicelli instant food field.
Obviously, according to foregoing of the present invention,,, can also make modification, replacement or the change of other various ways not breaking away under the above-mentioned basic fundamental thought of the present invention prerequisite according to the ordinary skill knowledge and the customary means of this area.