CN109320971A - A kind of edible wheat embryo film and preparation method thereof - Google Patents
A kind of edible wheat embryo film and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C—CHEMISTRY; METALLURGY
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- C08J2489/00—Characterised by the use of proteins; Derivatives thereof
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Abstract
A kind of preparation method of edible wheat embryo film, the following steps are included: 100 parts by weight wheat embryos are mixed with 20-40 parts by weight of soybean protein isolate, water is added to be mixed in the ratio of 1:5 again, it is subsequently placed in defibrination in fiberizer, then pulverization process is carried out in micronizer, granularity that treated is less than 10 μm；1-2 parts by weight of sucrose aliphatic ester is added, 40-50 DEG C is heated to and makes it dissolve and in 25MPa, 35 DEG C of matter condition second homogenate；20-30min is vacuumized in the case where vacuum degree is 0.01MPa after being subsequently cooled to 18-22 DEG C；The homogenizing fluid of evacuated processing is poured on stainless steel plate, film thickness is controlled in 0.8-1mm, then places it in electric drying oven with forced convection, film is taken off in 60 DEG C of constant temperature dry 4-5h taking-ups.This wheat embryo film film thickness is suitable for, tensile strength is high, permeability rate is low.And preparation method step is simple, easy to process.
Description
Technical field
The present invention relates to a kind of edible wheat embryo films and preparation method thereof.
Background technique
Wheat is one of staple food crop in the world, and the wheat total output in China accounts for No. 1 in the world, gross annual output amount
About 1.10 hundred million tons, wheat embryo account for about amount of wheat be 2~3%, about 220~3,300,000 tons of the wheat embryo that can be developed and used.
Wheat embryo is described as " the natural nutrition treasure-house of the mankind ", the more and more weight by domestic and international research and development person by nutritionists
Depending on.According to surveying and determination, globulin 18.9% in the protein of wheat embryo, glutenin 0.3%~0.37%, gliadin l4%,
It is a kind of good protein, protein bio potency can compare favourably with the egg of protein pattern food.Its contained vitamin B1,
B2, iron and potassium are 3 times, 8 times, 4 times and 8 times of equivalent flour respectively, additionally contain zinc abundant.Wheat embryo contains embryo oil
About 10% or so, 20-30mg containing vitamin E in every 100g wheat-germ oil are currently known containing one of highest food of vitamin E.
So wheat embryo is a kind of ideal anti-aging and beauty food.Byproduct of the wheat embryo as wheat flour processing factory
Resource is extremely abundant.However most of flour mills are added to the wheat embryo separated in wheat bran and are used as feed, so that this
One precious resources fails to obtain abundant, reasonable utilization.
Edible packaging is to comply with people to develop rapidly novel convenient purification and the Harmless of food packaging
Food packaging, it can shield and prevent environmental pollution caused by due to abandoning packaging bag to food.Edibility packet
Dress film is with protein, fat, starch etc. be can fresh-keeping foodstuff, nontoxic, workable packaging film made of base-material.
It prepares edible film using wheat embryo to have the following problems: (1) due to the partially protein of wheat embryo and carbon
Hydrate forms conjugated protein, and there are also parts to be wrapped in by macromolecular substances such as cellulose, hemicelluloses, and availability is not
It is high；(2) low percentages of protein of the wheat embryo of wheat embryo, only 30% or so, it is difficult to form a film；(3) in wheat embryo
Contained lipid can reduce the permeability rate of film, improve the quality of film, but due to the easy separate out of lipid, cause to be layered, nothing
Method utilizes.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of edible wheat embryo film, film thickness is suitable for, tension
Intensity is high and permeability rate is low.
Another technical problem to be solved by this invention is to provide a kind of preparation method of edible wheat embryo film, should
Method and step is simple, easy to process.
To solve above-mentioned technical problem the present invention provides a kind of edible wheat embryo film, it is made of following steps:
(1) refining step: the wheat embryo of 100 parts by weight and the soybean protein isolate of 20-40 parts by weight are mixed to get
Mixture and water are mixed evenly according to the ratio of mass ratio 1:5, are subsequently placed in defibrination in fiberizer and are mixed by mixture
Slurry is closed, mixed slurry is subjected to pulverization process in micronizer, granularity that treated is less than 10 μm；
(2) sucrose fatty ester of 1-2 parts by weight, the Sucrose Fatty Acid Ester emulsifying step: are added in above-mentioned mixed slurry
HLB value >=10 of fat acid esters are then heated to 40-50 DEG C and dissolve sucrose fatty ester, in homogenization pressure 25MPa, homogeneous temperature
Second homogenate is carried out under the conditions of 35 DEG C of degree forms homogenizing fluid；
(3) vacuum step: by above-mentioned homogenizing fluid be cooled to 18-22 DEG C be placed in vacuum evacuation device remove homogeneous after
The foam of generation, vacuum degree 0.01MPa, pumpdown time 20-30min；
(4) film formation step: the homogenizing fluid through above-mentioned vacuumize process is poured on stainless steel plate, and control film thickness exists
Then stainless steel plate is placed in electric drying oven with forced convection by 0.8-1mm, controlled at 60 DEG C, take out after freeze-day with constant temperature 4-5h
Film is taken off to get wheat embryo film is arrived.
The present invention also provides the preparation methods of edible wheat embryo film, method includes the following steps:
(1) refining step: the wheat embryo of 100 parts by weight and the soybean protein isolate of 20-40 parts by weight are mixed to get
Mixture, the water that 500 parts by weight are added in the mixture are mixed evenly, and are subsequently placed in defibrination in fiberizer and obtain mixing slurry
Mixed slurry is carried out pulverization process in micronizer by material, and granularity that treated is less than 10 μm；
(2) sucrose fatty ester of 1-2 parts by weight, the Sucrose Fatty Acid Ester emulsifying step: are added in above-mentioned mixed slurry
HLB value >=10 of fat acid esters are then heated to 40-50 DEG C and dissolve sucrose fatty ester, in homogenization pressure 25MPa, homogeneous temperature
Second homogenate is carried out under the conditions of 35 DEG C of degree forms homogenizing fluid；
(3) vacuum step: by above-mentioned homogenizing fluid be cooled to 18-22 DEG C be placed in vacuum evacuation device remove homogeneous after
The foam of generation, vacuum degree 0.01MPa, pumpdown time 20-30min；
(4) film formation step: the homogenizing fluid through above-mentioned vacuumize process is poured on stainless steel plate, and control film thickness exists
Then stainless steel plate is placed in electric drying oven with forced convection by 0.8-1mm, controlled at 60 DEG C, take out after freeze-day with constant temperature 4-5h
Film is taken off to get wheat embryo film is arrived.
Advantages of the present invention:
Refining step: the membrane formation mechanism of edible film is generally protein molecular and passes through hydrophobic effect, disulfide bond and hydrogen bond shape
At network structure, the edible film with certain barrier action and intensity is formed.Wheat embryo contain 30% or so protein,
10% or so lipid and 40.0% or so carbohydrate, due to the partially protein and carbohydrate shape of wheat embryo
At conjugated protein, there are also parts to be wrapped in by macromolecular substances such as cellulose, hemicelluloses, and availability is not high.The present invention
Using by after wheat embryo defibrination, juice carries out micronization processes using micronizer, when treated granularity is less than 10 μm
When, the macromolecular substances such as cellulose, hemicellulose can be wrapped in protein separate out, conjugated protein can also be separated,
By protein separate out, for forming a film.
Edible film is made using wheat embryo merely, due to the low percentages of protein of wheat embryo, it is difficult to it forms a film, this
Invention is compounded using wheat embryo with soybean protein isolate to solve, and protein content is higher than 90% in soybean protein isolate, can
To make up the shortage of protein content in slurry.
Emulsifying step: since the film water penetration that simple protein is formed is relatively high, contained 10% in wheat embryo is left
Right lipid can reduce the permeability rate of film.Due to the easy separate out of lipid, the present invention is using sucrose fatty ester come to lipid
It is emulsified, forms emulsion to prevent the free of lipid, because the slurry continuous phase of preparation wheat embryo film is water phase, because
This, the HLB value of sucrose fatty ester has to be larger than 10, and otherwise, sucrose fatty ester does not dissolve inherently, does not have emulsification and makees
With.The stability of emulsion and the granularity of emulsion are related, and the smaller stability of granularity is bigger, in addition, the size of granularity also influences
The water penetration of film.The present invention is asked using progress second homogenate under the conditions of homogenization pressure 25MPa, 35 DEG C of homogenizing temperature to solve this
Topic.
Vacuum step: it is rich in protein in the slurry due to preparing film, also generates a large amount of bubbles after homogeneous, the present invention adopts
With removing bubble is vacuumized, can be sloughed through test of many times when vacuum degree is 0.01MPa, and the pumpdown time is 20-30min
Bubble in slurry.
Film formation step: the edible wheat embryo film thickness prepared by this method is suitable, tensile strength is high and permeable
Rate is low.
In addition, the present invention is basic raw material using wheat embryo, biologically active wheat embryo product is developed, is reduced
The wasting of resources increases the added value of wheat embryo, has great importance to the exploitation of the byproduct of wheat flour processing.Meanwhile
Wheat embryo price is cheap, and the product of exploitation should the market competitiveness with higher.
Specific embodiment
Embodiment one:
(1) refining step: wheat embryo 1000g is weighed on electronic scale, soybean protein isolate 200g is mixed to get mixing
Water 6000g is added in the mixture and stirs evenly, is subsequently placed in defibrination in fiberizer and obtains mixed slurry, by mixed slurry for object
Pulverization process is carried out in micronizer, granularity that treated is less than 10 μm；
(2) emulsifying step: weighing each 10g of sucrose fatty ester that HLB value is 8 and HLB value is 14 respectively on electronic scale,
Be uniformly mixed, be added in above-mentioned mixed slurry, be then heated to 40 DEG C and dissolve sucrose fatty ester, homogenization pressure 25MPa,
Second homogenate is carried out under the conditions of 35 DEG C of homogenizing temperature forms homogenizing fluid；
(3) vacuum step: by above-mentioned homogenizing fluid be cooled to 18 DEG C be placed in vacuum evacuation device remove homogeneous after produce
Raw foam, vacuum degree 0.01MPa, pumpdown time 20min；
(4) film formation step: the homogenizing fluid through above-mentioned vacuumize process is poured on stainless steel plate, and control film thickness exists
Then stainless steel plate is placed in electric drying oven with forced convection by 0.8-1mm, controlled at 60 DEG C, take out and take off after freeze-day with constant temperature 4h
Film to get arrive wheat embryo film.
Through detecting: resulting wheat embryo film is yellow, film thickness 0.072mm, tensile strength 4.48N/mm2N, thoroughly
Water rate is 22.3g.mm/kPadm2。
Embodiment two:
(1) refining step: wheat embryo 1000g is weighed on electronic scale, soybean protein isolate 400g is mixed to get mixing
Water 7000g is added in the mixture and stirs evenly, is subsequently placed in defibrination in fiberizer and obtains mixed slurry, by mixed slurry for object
Pulverization process is carried out in micronizer, granularity that treated is less than 10 μm；
(2) emulsifying step: weighing the sucrose fatty ester 20g that HLB value is 14 on electronic scale, is uniformly mixed, in addition
It states in mixed slurry, is then heated to 45 DEG C and dissolves sucrose fatty ester, in 35 DEG C of homogenization pressure 25MPa, homogenizing temperature items
Second homogenate is carried out under part forms homogenizing fluid；
(3) vacuum step: by above-mentioned homogenizing fluid be cooled to 20 DEG C be placed in vacuum evacuation device remove homogeneous after produce
Raw foam, vacuum degree 0.01MPa, pumpdown time 25min；
(4) film formation step: the homogenizing fluid through above-mentioned vacuumize process is poured on stainless steel plate, and control film thickness exists
Then stainless steel plate is placed in electric drying oven with forced convection by 0.8-1mm, controlled at 60 DEG C, take out after freeze-day with constant temperature 4.5h
Film is taken off to get wheat embryo film is arrived.
Through detecting: resulting wheat embryo film is yellow, film thickness 0.075mm, tensile strength 5.72N/mm2N, permeable
28.4g.mm/kPa·d·m2。
Embodiment three:
(1) refining step: weighing wheat embryo 10kg, soybean protein isolate 3kg is mixed to get mixture on electronic scale,
Water 65kg is added in the mixture to stir evenly, is subsequently placed in defibrination in fiberizer and obtains mixed slurry, by mixed slurry super
Atomizer carries out pulverization process, and granularity that treated is less than 10 μm；
(2) it is each emulsifying step: to weigh the sucrose fatty ester that HLB value is 8 and HLB value is 14 respectively on electronic scale
150g is uniformly mixed, is added in above-mentioned mixed slurry, is then heated to 50 DEG C and dissolves sucrose fatty ester, in homogenization pressure
25MPa, second homogenate is carried out under the conditions of 35 DEG C of homogenizing temperature form homogenizing fluid；
(3) vacuum step: by above-mentioned homogenizing fluid be cooled to 22 DEG C be placed in vacuum evacuation device remove homogeneous after produce
Raw foam, vacuum degree 0.01MPa, pumpdown time 30min；
(4) film formation step: the homogenizing fluid through above-mentioned vacuumize process is poured on stainless steel plate, and control film thickness exists
Then stainless steel plate is placed in electric drying oven with forced convection by 0.8-1mm, controlled at 60 DEG C, take out and take off after freeze-day with constant temperature 5h
Film to get arrive wheat embryo film.
Through detecting: resulting wheat embryo film is yellow, film thickness 0.073mm, tensile strength 4.56N/mm2N, permeable
24.2g.mm/kPa·d·m2。
Example IV:
(1) refining step: weighing wheat embryo 10kg, soybean protein isolate 4kg is mixed to get mixture on electronic scale,
Water 70kg is added in the mixture to stir evenly, is subsequently placed in defibrination in fiberizer and obtains mixed slurry, by mixed slurry super
Atomizer carries out pulverization process, and granularity that treated is less than 10 μm；
(2) emulsifying step: weighing the sucrose fatty ester 200g that HLB value is 12 on electronic scale, is uniformly mixed, in addition
It states in mixed slurry, is then heated to 45 DEG C and dissolves sucrose fatty ester, in 35 DEG C of homogenization pressure 25MPa, homogenizing temperature items
Second homogenate is carried out under part forms homogenizing fluid；
(3) vacuum step: by above-mentioned homogenizing fluid be cooled to 20 DEG C be placed in vacuum evacuation device remove homogeneous after produce
Raw foam, vacuum degree 0.01MPa, pumpdown time 25min；
(4) film formation step: the homogenizing fluid through above-mentioned vacuumize process is poured on stainless steel plate, and control film thickness exists
Then stainless steel plate is placed in electric drying oven with forced convection by 0.8-1mm, controlled at 60 DEG C, take out and take off after freeze-day with constant temperature 5h
Film to get arrive wheat embryo film.
Through detecting: resulting wheat embryo film is yellow, film thickness 0.074mm, tensile strength 5.81N/mm2N, permeable
27.9g.mm/kPa·d·m2。
Measurement concrete operations step in aforementioned four embodiment in relation to wheat embryo film thickness, tensile strength (T), permeability rate
It is rapid as follows:
1, film thickness determination: taking 4~5 points at random, surveys its thickness with micrometer (precision 0.001mm).Take its average value.
2, diaphragm: being cut into the strip of 100mm × 10mm by the measurement of tensile strength (T), is popped one's head in using stretching on physical property instrument,
Tensile speed is 1mmfs.Physical property instrument is set as maximum pull and stretching distance.Tensile strength (T) calculation formula is as follows:
T=F/LW
In formula: T is that tensile strength unit is (N/mm2)；F is that maximum pull unit is N；L is the thickness unit of membrane sample
For mm；W is that the width unit of membrane sample is mm.
3, the measurement of permeability rate
According to plastic film and the principle and step of sheet material moisture vapor experimental method, using 87 method of GB1037-, and
Slightly change.Smooth, dry, uniform film is selected, after measuring its thickness, is sealed in the moisture vapor transmission cup cup equipped with anhydrous calcium chloride
Mouthful, it is put into after weighing in the drier that bottom is barium chloride saturated solution, relative humidity is 90%, weighs afterwards for 24 hours.
Moisture-vapor transmission (WVP): (g.mm/kPadm2)
WVP=[(M2-M1)L]/At△P
In formula: M1Original weight unit for film and moisture vapor transmission cup and desiccant is g；M2For water suction caudacoria and moisture vapor transmission cup and do
The unit of weight of drying prescription is g；L is that the thickness unit of film is mm；A is that effective measurement square measure is m2；T is interval time of measurement
Unit is d；△ P is that the vapor pressure difference unit of film two sides is kPa.
4, the measurement of wheat embryo granularity
Using the partial size of 2000 Malvern laser diffraction analyzer of Mastersizer measurement wheat embryo.Take appropriate defibrination
Plumule slurry afterwards, uses distilled water as dispersing agent, is dispersed with ultrasonic wave to powder, measures the partial size of powder.
Claims (2)
1. a kind of preparation method of edible wheat embryo film, which comprises the following steps:
(1) refining step: the wheat embryo of 100 parts by weight is mixed to get with the soybean protein isolate of 20-40 parts by weight and is mixed
Mixture and water are mixed evenly according to the ratio of mass ratio 1:5, are subsequently placed in defibrination in fiberizer and obtain mixing slurry by object
Mixed slurry is carried out pulverization process in micronizer by material, and granularity that treated is less than 10 μm；
(2) sucrose fatty ester of 1-2 parts by weight, the sucrose-fatty emulsifying step: are added in above-mentioned mixed slurry
HLB value >=10 of ester are then heated to 40-50 DEG C and dissolve sucrose fatty ester, in homogenization pressure 25MPa, homogenizing temperature 35
Second homogenate is carried out under the conditions of DEG C forms homogenizing fluid；
(3) vacuum step: by above-mentioned homogenizing fluid be cooled to 18-22 DEG C be placed in vacuum evacuation device remove homogeneous after generate
Foam, vacuum degree 0.01MPa, pumpdown time 20-30min；
(4) film formation step: the homogenizing fluid through above-mentioned vacuumize process is poured on stainless steel plate, controls film thickness in 0.8-
Then stainless steel plate is placed in electric drying oven with forced convection by 1mm, controlled at 60 DEG C, take out after freeze-day with constant temperature 4-5h and take off film,
Obtain wheat embryo film.
2. edible wheat embryo prepared by a kind of preparation method of edible wheat embryo film according to claim 1
Film.
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Application publication date: 20190212 |