CN103740117A - Edible composite membrane with stable mechanical properties and preparation method thereof - Google Patents
Edible composite membrane with stable mechanical properties and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an edible composite membrane with stable mechanical properties and a preparation method thereof. Soybean protein isolate and gelatin are subjected to steam cross-linking processing under the participation and assistance of kappa-carrageenan and under unique reaction conditions, so that the internal structure of soybean protein isolate and gelatin protein is reconstructed; and also by further choosing specific usage amount of various compositions and specific plasticizer compositions and ratio, protein forms a relatively compact uniform three-dimension stereo net structure, so that the stability of the membrane material is effectively improved, the variation amplitude of mechanical properties is relatively small within the storage period of 3 months, the tensile strength is reduced only by 5-12%, the composition membrane is increased in water permeability only by 5-8%, increased in oxygen permeability only by 3-5.5% and increased in carbon dioxide permeability only by 2-4.5%, the color and the transparency are not influenced, and the shelf life of food is prolonged. According to the composite membrane, the operation is simple, the product quality is stable and reliable, and the composite membrane is suitable for industrial production.
Description
Technical field
The invention provides edible composite membrane of a kind of stable mechanical performance type and preparation method thereof, more specifically to soybean protein isolate/gelatin/Kappa-Carraginan composite package film and preparation method thereof, belong to Food Packaging technology field.
Background technology
The quality guaranteed period of food depends on food product pack and obstruct to external world thereof.Plastic film application is commonplace, but is easy to produce obnoxious flavour and peculiar smell, and is difficult for decomposing, and causes " white pollution ".Edible film is because of its distinctive barrier, security and the advantage such as pollution-free, and enjoys the extensive concern of food service industry and packaging industry.But see based on existing domestic and international edible film progress, edible film stable mechanical performance within storage period is poor, mechanical property alters a great deal in storage period, is to cause the principal element that edible film temporarily can't widespread use market.
At present, domestic about edible soybean protein composite membrane, research focuses mostly at present on mechanical property improves, and for example, patent CN 103146004A by introducing photosensitive polymers PVA-SbQ in SPI, carry out UV radiation modification processing and prepare soybean protein film, improve composite membrane water tolerance; Patent CN 101199314A, take soybean protein and wheat-gluten as main raw material, adopts glutamine transaminage to carry out modification, improves tensile strength and the unit elongation of composite membrane; Patent CN 102190805A adopts the structure of supersound process soybean transformation albumen, and the edible film tensile strength that raising soybean protein is matrix, increases composite membrane transmittance, strengthened the barrier to oily matter; Also be no lack of that the reactive behavior utilized is high, reaction is fast, to resultant is high, cross-linking properties good, penetrativity is strong glutaraldehyde steam treatment soybean protein, prepare composite membrane, but, above-mentioned various research has been ignored when research improves mechanical property, the research that how to improve stable mechanical performance.Therefore, how in the situation that ensuring the quality of products, by the processing of soybean protein isolate molecular modification, regulate preparation gordian technique, improve edible soybean protein composite membrane machinery performance, improve stability, just become one of current food service industry and food product pack industry problem demanding prompt solution.
Also not yet there is at present the report that uses specific method soybean protein isolate, gelatin, Kappa-Carraginan three together to be obtained to the edible soybean protein composite membrane of stable mechanical performance type by the modification of glutaraldehyde vapor crosslinking, especially do not use certain plasticizers, specific composition and proportioning are further worked in coordination with the consumable film that obtains stable mechanical performance.On this basis, the also report to vapor crosslinking mechanism, crosslinked environment not.
Summary of the invention
Object of the present invention: for the problem and shortage of above-mentioned existing existence, the invention provides a kind ofly have that technique is simple, easy handling, cycle are short, without complex apparatus, the obvious edible composite membrane preparation method of high-mechanical property stable form of advantage such as enhance product performance.Can widen soy protein isolate and utilize approach, improve value-added content of product.
The technical problem that the present invention solves: solve the prepared edibility protein film of at present domestic and international food product pack research field machinery stability when storage, wrap food poor, finally cause the wrap food quality guaranteed period significantly to decline, restriction edible film is applied to the common problem of food service industry, packaging industry.
The technical scheme that the present invention solves: the preparation method of the edible composite membrane of a kind of stable mechanical performance type, is characterized in that preparing according to following steps:
(1) to adding 100g temperature in beaker, be 40 ~ 60 ℃ of distilled water, with distilled water weight percent meter, add 5 ~ 7% gelatin and 1 ~ 3%k-carrageenin, after two kinds of glue water absorption and swellings, add again 4 ~ 8% dehydrated alcohols, 1.0 ~ 3.0% softening agent, 0.05 ~ 0.15% sodium sulphite anhydrous 99.3, under the state of magnetic agitation, add 2 ~ 4% soybean protein isolates, obtain mixing solutions;
(2) pH is adjusted to 8.0, after magnetic stirrer 45-50s, 90-95 ℃ of heating in water bath 20-25min, adopts ultrasonic wave to carry out the degassed processing of froth breaking, ultrasound condition: 100-150 hertz, times 20 min, in the acrylic board slot that the solution after degassed is poured into;
(3) glutaraldehyde liquid is put into temperature automatically controlled pressure control and airtight steam crosslinking device, in airtight steam crosslinking device, carry out the reaction of glutaraldehyde vapor crosslinking, concrete reaction conditions: steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, be that temperature is to react 20 ~ 30min under 40 ~ 50 ℃ of conditions, install inner glutaraldehyde vapour concentration and be controlled at 20-25ppm; Condition while modulating subsequently low temperature length, temperature is to react 1 ~ 2h under 25 ~ 30 ℃ of conditions, installs inner glutaraldehyde vapour concentration and is controlled at 10-15ppm;
(4) after vapor crosslinking, will fill 50 ℃ of forced air drying 15h of acrylic board of film-forming soln, dry rear room temperature is placed 6-7h, and bath temperature is to take off film after 87 ℃ of 45s that ease back;
(5) finished product.
Softening agent described in preferred steps (1) is the two mixture of glycerine and polyoxyethylene glycol, and the two mass ratio is 2:3; Or the softening agent described in preferred steps (1) is glycerine, polyoxyethylene glycol and polyvinyl alcohol three's mixture, three's mass ratio is 2:3:1.
The board slot specification of preferred steps (2) acrylic board is length × wide × high 300 × 300 × 10mm, and pour mask amount is 100g.
The edible composite membrane that simultaneously provides aforesaid method to prepare, has following characteristics:
(1) 3 months storage periods, 25 ℃ of reserve temperatures, humidity 50%, described edible composite membrane tensile strength only reduces 5-12%, and only the tensile strength of soybean protein isolate and the composite membrane of gelatin after glutaraldehyde solution crosslinking Treatment reduces 20-30%; And
(2) within 3 months storage periods, composite membrane water-permeable increases 5-8%, and only the water-permeable of soybean protein isolate and the composite membrane of gelatin after glutaraldehyde solution crosslinking Treatment increases 15-20%; And
(3) within 3 months storage periods, composite membrane oxygen-permeable increases 3-5.5%, and only the oxygen-permeable of soybean protein isolate and the composite membrane of gelatin after glutaraldehyde solution crosslinking Treatment increases 8-13.6%; And
(4) within 3 months storage periods, the saturating carbonic acid gas of composite membrane increases 2-4.5%, and only the saturating carbonic acid gas of soybean protein isolate and the composite membrane of gelatin after glutaraldehyde solution crosslinking Treatment increases 7-9.3%.
Wherein, the assessment method of stable mechanical performance is:
In formula: H
0---temperature is
25℃, humidity is the tensile strength of 50% ambient storage composite membrane after 2 days or water-permeable or oxygen-permeable or carbonic acid gas thoroughly; H
t---temperature is
25℃, humidity is the tensile strength of 50% ambient storage after 3 months or water-permeable or oxygen-permeable or carbonic acid gas thoroughly, 4 index comprehensives evaluation stable mechanical performance
The edible soybean protein composite membrane that the present invention makes can be directly water-soluble; Can be applicable to food packing inside bag, be specially adapted to packaging of meat products field, i.e. application in meat product packing inside bag, this product improves the quality of edible packing membrane on the one hand, extends the wrap food quality guaranteed period.This composite membrane has advantages of that two kinds of albumen are total on the other hand, in the presence of Kappa-Carraginan, make two kinds of albumen there is better biocompatibility, can supplement the necessary amino acid of human body, improve food value, thereby reach the object of " Green Packaging " simultaneously.
By the edible soy protein composite membrane making, in 25 ℃ of temperature, humidity, be that 50% ambient storage is carried out For Measuring Mechanical Properties (take soybean protein isolate and gelatin through the composite membrane of glutaraldehyde vapor crosslinking processing as contrast) after 3 months:
(1) tensile strength (TS) is measured
Adopt TA-XTplus2 matter structure instrument (TA.XT.Plus, Britain SMS company) to analyze soybean protein isolate edible film performance (physical strength).To treat that test sample makes the rectangular of length × wide 150 × 20mm, film thickness is 0.06mm.Stretching strength determination adopts A/SPR bending probe.It is 5g that the minimum perception of probe is set, and before stretching, probe travelling speed is 5.0mm/s, and the travelling speed in drawing process is 5.0 mm/ s, and the travelling speed after stretching in return course is 5.0 mm/s, and effectively stretching distance is 50mm.The edible film maximum induction force F(unit that for physical strength, tensile strength (Tensile strength) is popped one's head in drawing process g) represents.Each sample repeats 3 times, averages.
(2) steam breathability is measured:
Adopt and intend cup method mensuration water vapour permeability: take the Calcium Chloride Powder Anhydrous of 3g drying and pack in the weighing bottle that diameter is 20mm, soybean protein composite membrane to be measured is sealed in to bottle mouth position with paraffin, be placed in relative humidity and be 83% moisture eliminator (in-built Potassium Bromide saturated solution), after 1 day (24h), weigh, the increasing amount weighing by cup is calculated the transmitance of water vapor.
WVTR water vapour permeability (mg/cm
2d); Dm water vapor migration amount (mg); Area (the cm of A film
2); T minute (d);
(3) oxygen-permeable is measured:
Weighing bottled 3mL linolic acid, other process is with steam breathability measuring method.
(4) carbonic acid gas is measured thoroughly:
Weighing bottled 3mLKOH saturated solution, other process is with steam breathability measuring method.
(5) calculating of stable mechanical performance:
In formula: H
0---temperature is
25℃, humidity is the tensile strength of 50% ambient storage composite membrane after 2 days or water-permeable or oxygen-permeable or carbonic acid gas thoroughly; H
t---temperature is
25℃, humidity is the tensile strength of 50% ambient storage after 3 months or water-permeable or oxygen-permeable or carbonic acid gas thoroughly.
The measuring method of tensile strength, water-permeable, oxygen-permeable, saturating carbonic acid gas also can adopt other ordinary method of this area to measure.
(6) soybean protein composite membrane surface microstructure is observed
Slide glass is dipped vertically in the polymeric protein liquid of preparation, after 3 min, vertically take out, being placed in Bechtop dries and is placed on atomic force microscope (AFM) scan table, locate sample area to be scanned with watch-dog, in function software, select to rap pattern (Tapping Mode) and scan, parameter setting: adopt silicon nitride (Si
3n
4) cantilever, the long 85 μ m of micro-cantilever, cantilever force constant 2.5 Nm
-1; SNL-10 type needle point, probe tip radius-of-curvature is 20-30 nm.Test determination temperature remains on 22 ± 1 ℃, and ambient relative humidity remains to more than 50%.Observe the surface finish difference of each histone liquid, and utilize maximum peak height and the mean roughness of afm image analytical system to scanning samples to carry out quantitative measurment.
Beneficial effect of the present invention:
(1) the invention is used glutaraldehyde steam to carry out crosslinking Treatment gelatin, soybean protein isolate and 1 ~ 3%k-carrageenin; Further select specific amounts of components and use specific softening agent, the edible composite membrane of stable mechanical performance type making was not compared for contrasting through the composite membrane of glutaraldehyde vapor crosslinking processing with soybean protein isolate, gelatin within 3 months storage periods, the composite membrane machinery stability of vapor crosslinking modification is better, in storage period, be 3 months in-draw strength decreased 5-12%, water-permeable increases 5-8%, oxygen-permeable increases 3-5.5%, and carbonic acid gas increases 2-4.5% thoroughly.Protein polymer configuration of surface is more smooth, fine and close, smooth.Stable mechanical performance is more lasting, increases substantially product quality; Product presents faint yellow, free from beany flavor and peculiar smell, inclusion-free; Exterior quality is better.
(2) soybean protein isolate and glutin have good consistency, in thermal treatment denaturation process, protein molecular is fully unfolded, the hydraulic radius of self strengthens, glycinin is filled between gelatin linear molecule chain, now, Kappa-Carraginan plays synergy, be adsorbed on soybean protein and glutin molecule, Kappa-Carraginan is strengthened with the effect of two kinds of albumen, mutually tangle, form the space gel structure of co-continuous, generate complexing gelinite, adopt glutaraldehyde vapor crosslinking further soybean protein and glutin to be carried out to modification, free amine group on soybean protein isolate and glutin molecule and glutaraldehyde aldehyde radical generation condensation reaction, generate condensation product Schiff alkali, change intermolecular interaction and spacial framework and improve mechanical property.
Amino generation mechanism of crosslinking in glutaraldehyde in aldehyde radical and soybean protein isolate, glutin:
Free amine group on soybean protein isolate and glutin molecule and glutaraldehyde generation condensation reaction, generate condensation product Schiff alkali.Reactive behavior is high, reaction is fast, high to resultant, cross-linking properties good, reactive force between molecular chain is strengthened, formed dot density more greatly, meticulousr protein molecular cross-linked three D tridimensional network, significantly improve the stable mechanical performance of composite membrane in duration of storage.
Meanwhile, glycerine and the two composition of polyoxyethylene glycol moulding dose used in the invention, and the two mass ratio is 2:3; The softening agent of further selecting glycerine, polyoxyethylene glycol and polyvinyl alcohol three composition, three's mass ratio is 2:3:1; Obtain unforeseeable technique effect.Softening agent glycerine negative ion and polyoxyethylene glycol negative ion are with having strong interaction force between glutaraldehyde positive ion, when glutaraldehyde vapor crosslinking is processed, 1 of glycerine, 3 carbon atoms and polyoxyethylene glycol carbon atom lose hydrogen atom simultaneously and form the carbanion with four reactivity worth, by the transfer of electron pair, on two kinds of softening agent carbon, negative charge can be transferred to the enol negative ion that forms conjugated double bond structures on Sauerstoffatom, hydrogen and hydroxyl remove with four molecular water forms, the water molecules removing is connected with albumen with the form of hydrogen bond, and then enol negative ion carries out nucleophilic addition(Adn) with the carbonyl of another glutaraldehyde, form carbon-carbon single bond, obtain reticulated structure chirality dendroid polymerisate macromole more closely, strengthened the interaction force between molecule, increased the rigidity of albumen, the effect of softening agent has simultaneously changed the kindliness between protein molecular, having strengthened is outlet capacity, reduce composite membrane fragility, further preferably polyethylene alcohol is auxiliary.Therefore, composite membrane of this invention preparation is compared with the composite membrane of preparing without this kind of method, has higher stable mechanical performance, and better thermotolerance, oil resistant, water tolerance, barrier.
(3) the present invention adopts unique reactive mode and condition, during at high temperature, in short-term with low temperature, length, in the wet crosslinking apparatus of the temperature automatically controlled control of great-jump-forward, react, steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, be that temperature is to react 20 ~ 30min under 40 ~ 50 ℃ of conditions, install inner glutaraldehyde vapour concentration and be controlled at 20-25ppm; Condition while modulating subsequently low temperature length, be that temperature is to react 1 ~ 2h under 25 ~ 30 ℃ of conditions, install inner glutaraldehyde vapour concentration and be controlled at 10-15ppm processing machinery stable performance type soybean protein composite membrane, improve tensile strength, water-permeable, oxygen-permeable, saturating carbonic acid gas, improve stable mechanical performance.Glutaraldehyde vapor crosslinking reaction temperature influence is very large, under comparatively high temps, glutaraldehyde steam can make the system generation condensation reaction of soybean protein, glutin, Kappa-Carraginan fast and fully, but lasting high temperature can cause reaction violent, make to occur in film forming liquid the insoluble cross-linked polymer of part, the composite membrane surface irregularity, the light transmission that form are poor, have reduced on the contrary composite membrane machinery performance.Based on principle and the various influence factor of the reaction of glutaraldehyde vapor crosslinking, on the basis of early-stage Study, contriver creatively first selects the relatively violent condition of high temperature, short time, glutaraldehyde is vaporized rapidly, the glutaraldehyde steam of high density is reacted rapidly within a certain period of time and form some amount mixture, relatively gentle condition while selecting afterwards low temperature long, make glutaraldehyde partial liquefaction, form Low Concentration Glutaraldehyde steam, make reactant within a certain period of time with the further fully reaction of film forming liquid, to form the cross-linked network of solid exquisiteness, the unexpected beneficial effect that the method obtains.
embodiment
embodiment 1the preparation method of the edible composite membrane of a kind of stable mechanical performance type
(1) to adding 100g temperature in beaker, be 40 ~ 60 ℃ of distilled water, with distilled water weight percent meter, add 5% gelatin and 1%k-carrageenin, after two kinds of glue water absorption and swellings, add again 4 ~ 8% dehydrated alcohols, 1.0% softening agent, 0.05 ~ 0.15% sodium sulphite anhydrous 99.3, under the state of magnetic agitation, add 2% soybean protein isolate, obtain mixing solutions;
(2) pH is adjusted to 8.0, after magnetic stirrer 45-50s, 90-95 ℃ of heating in water bath 20-25min, adopts ultrasonic wave to carry out the degassed processing of froth breaking, ultrasound condition: 100-150 hertz, times 20 min, in the acrylic board slot that the solution after degassed is poured into;
(3) glutaraldehyde liquid is put into temperature automatically controlled pressure control and airtight steam crosslinking device, in airtight steam crosslinking device, carry out the reaction of glutaraldehyde vapor crosslinking, concrete reaction conditions: steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, be that temperature is to react 20min under 40 ℃ of conditions, install inner glutaraldehyde vapour concentration and be controlled at 20ppm; Condition while modulating subsequently low temperature length, temperature is to react 1h under 25 ℃ of conditions, installs inner glutaraldehyde vapour concentration and is controlled at 10ppm;
(4) after vapor crosslinking, will fill 50 ℃ of forced air drying 15h of acrylic board of film-forming soln, dry rear room temperature is placed 6-7h, and bath temperature is to take off film after 87 ℃ of 45s that ease back;
Softening agent described in step (1) is the two mixture of glycerine and polyoxyethylene glycol, and the two mass ratio is 2:3.
In storage period, be 3 months in-draw strength decreaseds 10.70%, water-permeable increases by 7.93%, and oxygen-permeable increases by 5.06%, and carbonic acid gas increases by 4.43% thoroughly, and the indexs such as physics and chemistry, microorganism all meet national standard.
embodiment 2
(1) to adding 100g temperature in beaker, be 40 ~ 60 ℃ of distilled water, with distilled water weight percent meter, add 7% gelatin and 3%k-carrageenin, after two kinds of glue water absorption and swellings, add again 4 ~ 8% dehydrated alcohols, 3.0% softening agent, 0.05 ~ 0.15% sodium sulphite anhydrous 99.3, under the state of magnetic agitation, add 3% soybean protein isolate, obtain mixing solutions;
(2) pH is adjusted to 8.0, after magnetic stirrer 45-50s, 90-95 ℃ of heating in water bath 20-25min, adopts ultrasonic wave to carry out the degassed processing of froth breaking, ultrasound condition: 100-150 hertz, times 20 min, in the acrylic board slot that the solution after degassed is poured into;
(3) glutaraldehyde liquid is put into temperature automatically controlled pressure control and airtight steam crosslinking device, in airtight steam crosslinking device, carry out the reaction of glutaraldehyde vapor crosslinking, concrete reaction conditions: steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, be that temperature is to react 30min under 50 ℃ of conditions, install inner glutaraldehyde vapour concentration and be controlled at 25ppm; Condition while modulating subsequently low temperature length, temperature is to react 2h under 30 ℃ of conditions, installs inner glutaraldehyde vapour concentration and is controlled at 15ppm;
(4) after vapor crosslinking, will fill 50 ℃ of forced air drying 15h of acrylic board of film-forming soln, dry rear room temperature is placed 6-7h, and bath temperature is to take off film after 87 ℃ of 45s that ease back;
(5) finished product.
Softening agent is the two mixture of glycerine and polyoxyethylene glycol, and the two mass ratio is 2:3.
In storage period, be 3 months in-draw strength decreaseds 9.40%, water-permeable increases by 7.73%, and oxygen-permeable increases by 4.76%, and carbonic acid gas increases by 3.56% thoroughly, and the indexs such as physics and chemistry, microorganism all meet national standard.
embodiment 3
(1) to adding 100g temperature in beaker, be 40 ~ 60 ℃ of distilled water, with distilled water weight percent meter, add 6.5% gelatin and 2%k-carrageenin, after two kinds of glue water absorption and swellings, add again 4 ~ 8% dehydrated alcohols, 1.8% softening agent, 0.05 ~ 0.15% sodium sulphite anhydrous 99.3, under the state of magnetic agitation, add 4% soybean protein isolate, obtain mixing solutions;
(2) pH is adjusted to 8.0, after magnetic stirrer 45-50s, 90-95 ℃ of heating in water bath 20-25min, adopts ultrasonic wave to carry out the degassed processing of froth breaking, ultrasound condition: 120 hertz, times 20 min, in the acrylic board slot that the solution after degassed is poured into;
(3) glutaraldehyde liquid is put into temperature automatically controlled pressure control and airtight steam crosslinking device, in airtight steam crosslinking device, carry out the reaction of glutaraldehyde vapor crosslinking, concrete reaction conditions: steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, be that temperature is to react 30min under 48 ℃ of conditions, install inner glutaraldehyde vapour concentration and be controlled at 23ppm; Condition while modulating subsequently low temperature length, temperature is to react 2h under 28 ℃ of conditions, installs inner glutaraldehyde vapour concentration and is controlled at 14ppm;
(4) after vapor crosslinking, will fill 50 ℃ of forced air drying 15h of acrylic board of film-forming soln, dry rear room temperature is placed 6-7h, and bath temperature is to take off film after 87 ℃ of 45s that ease back;
(5) finished product.
Described softening agent is glycerine, polyoxyethylene glycol and polyvinyl alcohol three's mixture, and three's mass ratio is 2:3:1.
In storage period, be 3 months in-draw strength decreaseds 8.70%, water-permeable increases by 6.57%, and oxygen-permeable increases by 3.44%, and carbonic acid gas increases by 2.93% thoroughly, and the indexs such as physics and chemistry, microorganism all meet national standard.
In 3 storage periods of embodiment, mechanical property experimental data is as follows:
The soybean protein isolate composite membrane of vapor crosslinking modification machinery performance in table 2 storage period
Note: storage environment humidity is 50%, three groups of parallel tests have all been carried out in every group of experiment, and each numerical value is three groups
The mean value of data.
comparative example
Take soybean protein isolate and gelatin, not passing through the processing of glutaraldehyde vapor crosslinking (uses mass percent concentration as 0.4-0.6% glutaraldehyde solution, glutaraldehyde specification is 80%) composite membrane for contrast, and do not use Kappa-Carraginan, softening agent is conventional glycerine, adopt reaction times of the temperature of reaction, 2-3 hour of conventional 50-60 ℃, is other same experimental group; Storage environment temperature is that 25 ℃, humidity are 50%, and For Measuring Mechanical Properties data are as following table:
Table 3 storage period is interior without vapor crosslinking modification soybean protein composite membrane machinery performance
Note: three groups of parallel tests have all been carried out in every group of experiment, and each numerical value is the mean value of three groups of data
Embodiment 3 is contrasted with comparative example stable mechanical performance, and result is as follows:
Table 4 is preserved and after 3 months, is made soybean protein composite membrane and blank film stable mechanical performance synopsis
Note: three groups of parallel tests have all been carried out in every group of experiment, and each numerical value is the mean value of three groups of data
In the apparent structure comparison diagram of glutaraldehyde vapor crosslinking modification and control group protein polymer from embodiment 3 (being the contrast of AFM lower surface shape appearance figure), find, protein polymer configuration of surface of the present invention is more smooth, fine and close, smooth.
Claims (8)
1. a preparation method for the edible composite membrane of stable mechanical performance type, is characterized in that preparing according to following steps:
(1) to adding 100g temperature in beaker, be 40 ~ 60 ℃ of distilled water, with distilled water weight percent meter, add 5 ~ 7% gelatin and 1 ~ 3%k-carrageenin, after two kinds of glue water absorption and swellings, add again 4 ~ 8% dehydrated alcohols, 1.0 ~ 3.0% softening agent, 0.05 ~ 0.15% sodium sulphite anhydrous 99.3, under the state of magnetic agitation, add 2 ~ 4% soybean protein isolates, obtain mixing solutions;
(2) pH is adjusted to 8.0, after magnetic stirrer 45-50s, 90-95 ℃ of heating in water bath 20-25min, adopt ultrasonic wave to carry out the degassed processing of froth breaking, ultrasound condition: 100-150 hertz (preferably 120 hertz), times 20 min, in the acrylic board slot that the solution after degassed is poured into;
(3) glutaraldehyde liquid is put into temperature automatically controlled pressure control and airtight steam crosslinking device, in airtight steam crosslinking device, carry out the reaction of glutaraldehyde vapor crosslinking, concrete reaction conditions: steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, be that temperature is to react 20 ~ 30min under 40 ~ 50 ℃ of conditions, install inner glutaraldehyde vapour concentration and be controlled at 20-25ppm; Condition while being adjusted to subsequently low temperature length, temperature is to react 1 ~ 2h under 25 ~ 30 ℃ of conditions, installs inner glutaraldehyde vapour concentration and is controlled at 10-15ppm;
(4) after vapor crosslinking, will fill 50 ℃ of forced air drying 15h of acrylic board of film-forming soln, dry rear room temperature is placed 6-7h, and bath temperature is to take off film after 87 ℃ of 45s that ease back;
(5) finished product.
2. the preparation method of the edible composite membrane of a kind of stable mechanical performance type according to claim 1, is characterized in that, the softening agent described in step (1) is the two mixture of glycerine and polyoxyethylene glycol, and the two mass ratio is 2:3.
3. the preparation method of the edible composite membrane of a kind of stable mechanical performance type according to claim 1, it is characterized in that, softening agent described in step (1) is glycerine, polyoxyethylene glycol and polyvinyl alcohol three's mixture, and three's mass ratio is 2:3:1.
4. according to the preparation method of the edible composite membrane of a kind of stable mechanical performance type described in claim 1-3 any one, it is characterized in that, the board slot specification of step (2) acrylic board is length × wide × high 300 × 300 × 10mm, and pour mask amount is 100g.
5. the edible composite membrane of preparing according to the preparation method described in claim 1-4 any one, is characterized in that: this composite membrane
(1) 3 months storage periods, 25 ℃ of reserve temperatures, humidity 50%, edible composite membrane tensile strength only reduces 5-12%; And
(2), within 3 months storage periods, composite membrane water-permeable only increases 5-8%; And
(3), within 3 months storage periods, composite membrane oxygen-permeable only increases 3-5.5%; And
(4), within 3 months storage periods, the saturating carbonic acid gas of composite membrane only increases 2-4.5%.
6. composite membrane according to claim 5, is characterized in that, the assessment method of stable mechanical performance is:
In formula: H
0---temperature is
25℃, humidity is the tensile strength of 50% ambient storage composite membrane after 2 days or water-permeable or oxygen-permeable or carbonic acid gas thoroughly; H
t---temperature is
25℃, humidity is the tensile strength of 50% ambient storage after 3 months or water-permeable or oxygen-permeable or carbonic acid gas thoroughly, 4 index comprehensives evaluation stable mechanical performance.
7. according to the composite membrane described in claim 5-6 any one, it is characterized in that, can be directly water-soluble.
8. the application of the composite membrane described in claim 5-7 any one in meat product packing inside bag.
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| CN104194016A (en) * | 2014-09-09 | 2014-12-10 | 青岛农业大学 | Nanometer peanut protein macromolecular composite membrane and preparation method thereof |
| CN104448368A (en) * | 2014-12-22 | 2015-03-25 | 东北农业大学 | Preparation method of soy isolate protein/polylactic acid composite packaging film |
| CN108727614A (en) * | 2018-06-20 | 2018-11-02 | 东北农业大学 | The preparation method of conductive WPC tunica fibrosas |
| CN110302679A (en) * | 2018-03-20 | 2019-10-08 | 中国石油化工股份有限公司 | Wet film of a kind of intelligence control and its preparation method and application |
| CN113621152A (en) * | 2021-07-26 | 2021-11-09 | 东北农业大学 | Processing method of edible antioxidant film |
| CN114874574A (en) * | 2022-05-24 | 2022-08-09 | 齐鲁工业大学 | Blend membrane material of carragheen and polyvinyl alcohol and preparation method and application thereof |
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| CN101940916A (en) * | 2009-07-03 | 2011-01-12 | 湖北工业大学 | Konjac glucomannan stroma protein molecularly imprinted membrane as well as preparation method and application thereof |
| CN102093722A (en) * | 2011-01-17 | 2011-06-15 | 四川大学 | Edible collagen food packaging film and preparation method thereof |
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| CN101940916A (en) * | 2009-07-03 | 2011-01-12 | 湖北工业大学 | Konjac glucomannan stroma protein molecularly imprinted membrane as well as preparation method and application thereof |
| CN102093722A (en) * | 2011-01-17 | 2011-06-15 | 四川大学 | Edible collagen food packaging film and preparation method thereof |
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| CN104194016A (en) * | 2014-09-09 | 2014-12-10 | 青岛农业大学 | Nanometer peanut protein macromolecular composite membrane and preparation method thereof |
| CN104448368A (en) * | 2014-12-22 | 2015-03-25 | 东北农业大学 | Preparation method of soy isolate protein/polylactic acid composite packaging film |
| CN104448368B (en) * | 2014-12-22 | 2017-07-14 | 东北农业大学 | A kind of preparation method of soybean protein isolate/PLA composite package film |
| CN110302679A (en) * | 2018-03-20 | 2019-10-08 | 中国石油化工股份有限公司 | Wet film of a kind of intelligence control and its preparation method and application |
| CN108727614A (en) * | 2018-06-20 | 2018-11-02 | 东北农业大学 | The preparation method of conductive WPC tunica fibrosas |
| CN113621152A (en) * | 2021-07-26 | 2021-11-09 | 东北农业大学 | Processing method of edible antioxidant film |
| CN114874574A (en) * | 2022-05-24 | 2022-08-09 | 齐鲁工业大学 | Blend membrane material of carragheen and polyvinyl alcohol and preparation method and application thereof |
| CN114874574B (en) * | 2022-05-24 | 2022-11-22 | 齐鲁工业大学 | Blend membrane material of carragheen and polyvinyl alcohol, preparation method and application thereof |
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