CN110057609B - Reference sample for testing preservation effect and preparation method and application thereof - Google Patents
Reference sample for testing preservation effect and preparation method and application thereof Download PDFInfo
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- CN110057609B CN110057609B CN201910305886.3A CN201910305886A CN110057609B CN 110057609 B CN110057609 B CN 110057609B CN 201910305886 A CN201910305886 A CN 201910305886A CN 110057609 B CN110057609 B CN 110057609B
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Abstract
The invention belongs to the technical field of preservation performance detection, and particularly relates to a reference sample for preservation effect testing, and a preparation method and application thereof. The reference sample for the preservation effect test comprises a water absorbing material, and the water absorbing material absorbs mixed liquid of chlorophyll, a humectant and an antioxidant. The consistency among reference samples is good, the method can be widely applied to the fresh-keeping effect evaluation of refrigerators and freezers, the experimental error is small, the repeatability is good, and good comparison work can be performed among different laboratories.
Description
Technical Field
The invention relates to the technical field of preservation performance detection, in particular to a reference sample for preservation effect test and a preparation method and application thereof.
Background
The refrigerator is the first choice appliance for preserving and preserving food in our daily life. In order to meet the demand of consumers for fresh-keeping, various refrigerator manufacturers continuously upgrade the fresh-keeping capacity of the storage space of the refrigerator. At present, the evaluation of the preservation effect of the refrigerator mainly adopts the change conditions of indexes such as moisture, vitamin c, vitamin E, chlorophyll, vitamin B group, folic acid and the like in fresh vegetables such as spinach after being stored for a certain period (such as 3 days or 4 days) in a refrigerator cold storage area, and the preservation effect is evaluated by analyzing the keeping condition of each index by each refrigerator.
The existing method for evaluating the fresh-keeping effect by taking fresh vegetables as storage objects has the following defects: firstly, the influence of the vegetable harvesting season is large, and the supply of the vegetables is difficult to effectively guarantee in non-season seasons; secondly, the uniformity of the fresh vegetables and the stability of the product characters are difficult to guarantee. These disadvantages easily cause large experimental error, and poor repeatability, and it is difficult to perform good comparison work between different laboratories.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a reference sample for testing the preservation effect, which aims to solve the problems that in the prior art, fresh vegetables are used as storage objects to evaluate the preservation effect, the influence of the harvest season of the vegetables is great, the supply of the vegetables is difficult to effectively guarantee in non-season, the uniformity and the stability of product characters of the fresh vegetables are difficult to guarantee, the experimental error is great, the repeatability is poor, and good comparison work is difficult to carry out among different laboratories. The reference sample for the preservation effect test comprises a water absorbing material, and a mixed solution of chlorophyll, a humectant and an antioxidant is absorbed in the water absorbing material. The consistency between the reference samples is good, the reference samples can be widely applied to the fresh-keeping effect evaluation of the refrigerator, the experimental error is small, the repeatability is good, and good comparison work can be performed among different laboratories.
The invention also aims to provide the preparation method of the reference sample for the preservation effect test, which is characterized in that the water absorbing material, the chlorophyll, the humectant and the antioxidant are contacted in a liquid environment, the process flow is simple, the preparation efficiency is high, the consistency among reference samples is good, the reference sample can be widely applied to the preservation effect evaluation of a refrigerator and a freezer, the laboratory capacity comparison of the preservation evaluation test of the refrigerator and the freezer, and the like, and has wide application prospect.
Another object of the present invention is to provide the use of the reference for testing fresh-keeping effect as described above in testing fresh-keeping effect of refrigerator and/or freezer.
A reference sample for a preservation effect test comprises a water absorbing material, wherein the water absorbing material absorbs a mixed solution of chlorophyll, a humectant and an antioxidant.
Preferably, the water absorbing material is arranged in a breathable water-proof bag;
preferably, the specification of the breathable water-resisting bag is 5-10cm × 8-15cm, and more preferably 6-8cm × 10-12 cm.
Preferably, the water-absorbing material is a plurality of layers, and each layer or every few layers are separated by a waterproof material;
preferably, the water absorbing material is formed by stacking 5 to 10 pieces;
preferably, the size of each layer of the water absorbing material is the same or different;
preferably, the specification of the water absorbing material is 3-8cm × 6-13cm, and more preferably 4-6cm × 8-10 cm.
Preferably, the water absorbing material is selected from at least one of non-woven fabric, cotton fabric or terylene fabric;
preferably, the waterproof material is at least one selected from a PP film, a PE film or a PET film.
Preferably, the antioxidant is selected from at least one of L-ascorbic acid, butylated hydroxyanisole, dibutyl hydroxytoluene and propyl gallate.
Preferably, the humectant is selected from at least one of propylene glycol, glycerin and sorbitol.
Preferably, the mass ratio of the antioxidant to the chlorophyll is 9-12: 1, more preferably 10 to 11: 1.
preferably, the solvent of the mixed solution is water;
preferably, the water is deoxidized water and is dissolved with non-oxidation protective gas;
preferably, the non-oxidizing protective gas is nitrogen.
The preparation method of the reference sample for the preservation effect test comprises the following steps:
contacting the water absorbing material, chlorophyll, humectant and antioxidant in a liquid environment;
preferably, the contact time is 4-8min, more preferably 5-6 min.
The reference sample for testing the preservation effect is applied to the detection of the preservation effect of the refrigerator and/or the freezer.
Compared with the prior art, the invention has the following beneficial effects:
(1) the reference sample for the preservation effect test has good consistency, can be widely applied to the preservation effect evaluation of the refrigerator, has small experimental error and good repeatability, and can perform good comparison work among different laboratories.
(2) According to the preparation method of the reference sample for the preservation effect test, the water absorbing material, the chlorophyll, the humectant and the antioxidant are contacted in a liquid environment, and a film with good water resistance and air permeability is used as an outer package to manufacture the reference sample. The preparation process is simple in flow, high in manufacturing efficiency and good in consistency among reference samples, can be widely applied to fresh-keeping effect evaluation of refrigerators and freezers, and has wide application prospects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a preparation process of a reference sample for a preservation effect test in the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
A reference sample for a preservation effect test comprises a water absorbing material, wherein the water absorbing material absorbs a mixed solution of chlorophyll, a humectant and an antioxidant.
The consistency among the reference samples for the preservation effect test is better, and the method can be widely applied to the preservation effect evaluation of refrigerators and freezers.
Preferably, the water absorbing material is arranged in a breathable water-proof bag;
preferably, the specification of the breathable water-resisting bag is 5-10cm × 8-15cm, and more preferably 6-8cm × 10-12 cm.
The gauge of the breathable water-barrier bag is typically, but not limited to, 5cm × 8cm, 6cm × 9cm, 7m × 10cm, 8cm × 11cm, 9cm × 12cm or 10cm × 15cm, for example.
Preferably, the water-absorbing material is a plurality of layers, and each layer or every few layers are separated by a waterproof material;
preferably, the water absorbing material is formed by stacking 5 to 10 pieces;
preferably, the size of each layer of the water absorbing material is the same or different;
the multiple layers of water absorbing materials are stacked together, and each layer of water absorbing material is separated by the waterproof material, so that the consistency among reference samples can be ensured, and the method has the advantages of higher accuracy, smaller experimental error and better repeatability when being used for evaluating the fresh-keeping effect of a refrigerator or an ice chest.
Preferably, the specification of the water absorbing material is 3-8cm × 6-13cm, and more preferably 4-6cm × 8-10 cm.
The specification of the water absorbing material is typically, but not limited to, 3cm × 6cm, 4cm × 7cm, 5cm × 8cm, 6cm × 9cm, 7cm × 10cm or 8cm × 13cm, for example.
Preferably, the water absorbing material is selected from at least one of non-woven fabric, cotton fabric or terylene fabric;
preferably, the water-absorbing material is selected from non-woven fabrics. Nonwoven fabrics, also known as nonwovens, are composed of oriented or random fibers. It is called a cloth because of its appearance and certain properties. The polypropylene (pp material) granules are mostly adopted as raw materials and are produced by a continuous one-step method of high-temperature melting, spinning, laying a line and hot-pressing coiling. A novel fabric product having a soft, air-permeable and planar structure, which is strong, durable, silky and soft without generating lint, is one of reinforcing materials, and has a cotton-like feeling, and a non-woven fabric bag which is easy to form and inexpensive as compared with cotton. The invention uses non-woven fabrics to manufacture the reference sample, which is more beneficial to forming and ensures that the consistency among the reference samples is good.
Preferably, the waterproof material is at least one selected from a PP film, a PE film or a PET film.
Preferably, the antioxidant is selected from at least one of L-ascorbic acid, butylated hydroxyanisole, dibutyl hydroxytoluene and propyl gallate.
The right use of the antioxidant can not only prolong the storage life and the shelf life of the food, bring good economic benefits to producers and consumers, but also bring better food safety to consumers, and the invention preferably adopts L-ascorbic acid (vitamin C) to simulate the component composition of spinach.
Preferably, the humectant is selected from at least one of propylene glycol, glycerin and sorbitol.
Moisturizers are hydrophilic skin moisturizing substances that have the ability to bind water in the lower humidity range, moisturize the skin, and they can help maintain the skin in a more than normal equilibrium moisture content by controlling the exchange of moisture between the product and the surrounding air, and thus, reduce skin dryness. According to the invention, at least one of propylene glycol, glycerol and sorbitol is selected as the humectant, so that a good moisturizing effect can be achieved, the consistency between samples of reference samples for the preservation effect test is facilitated, and the preservation test effect is more accurate.
Preferably, the mass ratio of the antioxidant to the chlorophyll is 9-12: 1, more preferably 10 to 11: 1.
the mass ratio of antioxidant to chlorophyll is typically, but not limited to, for example, 9:1, 10:1, 11:1, or 12: 1.
Preferably, the solvent of the mixed solution is water;
preferably, the water is deoxidized water and is dissolved with non-oxidation protective gas;
preferably, the non-oxidizing protective gas is nitrogen.
The invention measures ultrapure water according to the prepared amount, and removes oxygen in the ultrapure water by using a vacuum pump or other degassing devices, wherein the deoxidation time is more than 30min, preferably 30-100 min.
The process of filling nitrogen is as follows: after the nitrogen cylinder is connected with the pipeline, the pipe orifice is close to the bottom of the container for containing pure water, the air valve is opened, and the flow is controlled within 200ml/min for standby.
The preparation method of the reference sample for the preservation effect test comprises the following steps:
contacting the water absorbing material, chlorophyll, humectant and antioxidant in a liquid environment; the manufacturing process is simple in flow, high in manufacturing efficiency, good in consistency among reference samples, capable of being widely applied to fresh-keeping effect evaluation of refrigerators and freezers, capability comparison among laboratories of fresh-keeping evaluation tests of refrigerators and freezers and the like, and wide in application prospect.
Preferably, the contact time is 4-8min, more preferably 5-6 min.
The time of contact is typically, but not limited to, 4min, 5min, 6min, 7min or 8min, for example.
In a preferred embodiment, the preparation method of the reference sample for testing the preservation effect comprises the following steps:
(a) making a small packaging bag, namely making the small packaging bag by using a breathable water-proof film, wherein the specification is 5-10cm × 8-15cm, sewing three sides, and reserving one side as an opening;
(b) making small blocks of water absorbing material, namely stacking 5-10 layers of large-size water absorbing material, cutting 5-10 layers of water absorbing material into small blocks with the specification of 3-8cm × 6-10cm by using a cutting tool, separating each small block of water absorbing material by using a waterproof material, and stacking the small blocks together;
(c) and (3) ultra-pure water deoxidation: measuring ultrapure water according to the prepared amount, and removing oxygen in the ultrapure water by using a vacuum pump or other degassing devices, wherein the deoxidation time is 30-100 min;
(d) filling nitrogen gas: after a nitrogen cylinder is connected with a pipeline, the pipe orifice is close to the bottom of a container for containing pure water, an air valve is opened, and the flow is controlled within 200ml/min for later use;
(e) weighing reagents: weighing the antioxidant standard substance by using a one-thousandth balance; weighing a chlorophyll standard substance, wherein the mass ratio of the antioxidant to the chlorophyll is (9-12): 1, measuring propylene glycol by using a cylinder;
(f) preparing a solution: dissolving weighed chlorophyll by using weighed propylene glycol, pouring into a volumetric flask of 1000ml, washing the measuring cylinder for 3 times by using a proper amount of pure water (about 15ml each time) filled with nitrogen, and putting the washing liquid into the volumetric flask of 1000 ml; adding the weighed antioxidant into a volumetric flask of 1000ml, fixing the volume to 1000ml, covering a cover, and shaking up until the antioxidant is completely dissolved;
(g) soaking: putting the water-absorbing materials which are separated by the waterproof materials and are stacked together into a suitable plastic self-sealing bag, and pouring the solution (operated under nitrogen environment) in the step (f) for soaking for 4-8 min.
(h) Bagging: and (b) squeezing the soaked non-woven fabric under a certain pressure to remove redundant liquid until no liquid drops, then filling the non-woven fabric into the bag obtained in the step (a), and sealing the bag to obtain a reference sample for testing the preservation effect.
The reference sample for testing the preservation effect is applied to the detection of the preservation effect of the refrigerator and/or the freezer. The fresh-keeping fruit testing experiment has small error and good repeatability, and can perform good comparison work among different laboratories.
The invention is further illustrated with reference to the following specific examples and the accompanying drawings.
The flow chart of the preparation process of the reference sample for the preservation effect test in the embodiments 1 to 4 of the present invention is shown in fig. 1.
Example 1
A reference sample for testing the preservation effect comprises a water absorbing material, wherein the water absorbing material absorbs a mixed solution of chlorophyll, a humectant and an antioxidant, and each water absorbing material is separated by a waterproof material and is arranged in a breathable water-proof bag;
wherein the antioxidant is L-ascorbic acid, the humectant is propylene glycol, the water absorbing material is non-woven fabric, the number of layers of the non-woven fabric is 5, the size is 6cm × 9cm, the waterproof material is a PE film, and the specification of the breathable water-resisting bag is 8cm × 11 cm;
the preparation method of the reference sample for the preservation effect test comprises the following steps:
(a) making a small packaging bag 8cm × 11cm by using a breathable water-proof film, sewing three sides, and keeping one side as an opening;
(b) stacking the large-size non-woven fabrics into 5 layers, cutting the 5 layers of non-woven fabrics into small pieces with the size of 6cm × 9cm by using a cutting tool, separating each small piece of non-woven fabrics by using a PE film, and then stacking the small pieces of non-woven fabrics together;
(c) measuring 1000ml of ultrapure water according to the prepared amount, and removing oxygen in the ultrapure water by using a vacuum pump or other degassing devices for 30 min;
(d) after a nitrogen cylinder is connected with a pipeline, the pipe orifice is close to the bottom of a container for containing pure water, an air valve is opened, and the flow is controlled at 200ml/min for later use;
(e) weighing reagents, namely weighing 3g of L-ascorbic acid standard substance by using a one-thousandth balance, weighing 0.3g of chlorophyll standard substance, and measuring 50ml of propylene glycol by using a 50ml measuring cylinder;
(f) dissolving weighed chlorophyll by using 50ml of propylene glycol, pouring the solution into a 1000ml volumetric flask, washing a 50ml measuring cylinder for 3 times by using a proper amount (about 15ml each time) of pure water filled with nitrogen, adding the washing solution into the 1000ml volumetric flask, adding weighed L-ascorbic acid into the 1000ml volumetric flask, fixing the volume to 1000ml, covering the flask, and shaking uniformly until L-ascorbic acid is completely dissolved;
(g) putting non-woven fabrics which are separated by preservative films and stacked together into a proper plastic self-sealing bag, and pouring the solution (operated in a nitrogen environment) in the step (f) into the bag to soak for 5 min;
(h) squeezing the soaked non-woven fabric under certain pressure to remove excessive water, then filling the bag in the step (a), and sealing the bag.
Example 2
A reference sample for testing the preservation effect comprises a water absorbing material, wherein the water absorbing material absorbs a mixed solution of chlorophyll, a humectant and an antioxidant, and each water absorbing material is separated by a waterproof material and is arranged in a breathable water-proof bag;
wherein the antioxidant is L-ascorbic acid, the humectant is glycerol, the water absorbing material is non-woven fabric, the number of layers of the non-woven fabric is 10, the size is 8cm × 13cm, the waterproof material is a PET film, and the specification of the breathable water-proof bag is 10cm × 15 cm;
the preparation method of the reference sample for the preservation effect test comprises the following steps:
(a) making a 10cm × 15cm small packaging bag with a breathable water-proof film, sewing three sides, and keeping one side as an opening;
(b) stacking the large-size non-woven fabric into 10 layers, cutting the 10 layers of non-woven fabric into small pieces with the size of 8cm × 13cm by using a cutting tool, separating each small piece of non-woven fabric by using a PET film, and then stacking the small pieces of non-woven fabric together;
(c) measuring 1000ml of ultrapure water according to the prepared amount, and removing oxygen in the ultrapure water by using a vacuum pump or other degassing devices, wherein the deoxidation time is 60 min;
(d) after connecting the nitrogen cylinder with the pipeline, opening the air valve with the pipe orifice close to the bottom of the container for containing pure water, and controlling the flow at 150ml/min for later use;
(e) weighing 3.3g of L-ascorbic acid standard substance by using a one-thousandth balance, weighing 0.3g of chlorophyll standard substance, and measuring 50ml of glycerol by using a 50ml measuring cylinder;
(f) dissolving weighed chlorophyll by using 50ml of glycerol, pouring the solution into a 1000ml volumetric flask, washing a 50ml measuring cylinder for 3 times by using a proper amount (about 15ml each time) of pure water filled with nitrogen, adding the washing solution into the 1000ml volumetric flask, adding weighed L-ascorbic acid into the 1000ml volumetric flask, fixing the volume to 1000ml, covering the flask, and shaking uniformly until L-ascorbic acid is completely dissolved;
(g) putting non-woven fabrics which are separated by preservative films and stacked together into a proper plastic self-sealing bag, and pouring the solution (operated in a nitrogen environment) in the step (f) into the bag to soak for 8 min;
(h) squeezing the soaked non-woven fabric under certain pressure to remove excessive liquid until no liquid drops, then filling the bag in the step (a), and sealing.
Example 3
A reference sample for testing the preservation effect comprises a water absorbing material, wherein the water absorbing material absorbs a mixed solution of chlorophyll, a humectant and an antioxidant, and each water absorbing material is separated by a waterproof material and is arranged in a breathable water-proof bag;
wherein the antioxidant is butyl hydroxy anisole, the humectant is glycerol, the water absorbing material is cotton cloth, the number of layers of the cotton cloth is 8, the size is 7cm × 10cm, the waterproof material is PE film, and the specification of the breathable water-proof bag is 9cm × 12 cm;
the preparation method of the reference sample for the preservation effect test comprises the following steps:
(a) making a small packaging bag 9cm × 12cm by using a breathable water-proof film, sewing three sides, and keeping one side as an opening;
(b) stacking the large-size cotton cloth into 8 layers, cutting the 8 layers of cotton cloth into small pieces with the size of 7cm × 10cm by using a cutting tool, separating each small piece of cotton cloth by using a PE film, and stacking the small pieces of cotton cloth together;
(c) measuring 1000ml of ultrapure water according to the prepared amount, and removing oxygen in the ultrapure water by using a vacuum pump or other degassing devices, wherein the deoxidation time is 50 min;
(d) after a nitrogen cylinder is connected with a pipeline, the pipe orifice is close to the bottom of a container for containing pure water, an air valve is opened, and the flow is controlled at 130ml/min for later use;
(e) 3.3g of butyl hydroxyanisole standard substance is weighed by a one-thousandth balance; weighing 0.3g of chlorophyll standard substance; measuring 50ml of glycerol by using a 50ml measuring cylinder;
(f) dissolving weighed chlorophyll by using 50ml of glycerol, pouring into a 1000ml volumetric flask, washing a 50ml graduated cylinder for 3 times by using a proper amount of pure water (about 15ml each time) filled with nitrogen, and putting the washing liquid into the 1000ml volumetric flask; adding weighed butyl hydroxy anisole into a volumetric flask of 1000ml, fixing the volume to 1000ml, covering the flask with a cover, and shaking up until the butyl hydroxy anisole is completely dissolved;
(g) filling cotton cloth which is separated by a preservative film and stacked together into a proper plastic self-sealing bag, and pouring the solution (operated under the nitrogen environment) in the step (f) for soaking for 8 min;
(h) squeezing the soaked cotton cloth under certain pressure to remove excessive liquid until no liquid drops, then filling the bag in the step (a), and sealing.
Example 4
A reference specimen for testing freshness retaining effect was prepared in the same manner as in example 1, except that the water-absorbent material used was a polyester fabric.
Test examples
The freshness effect test in examples 1-4 was performed by sampling and testing the amount of water, antioxidant and chlorophyll in the reference sample as initial values of the reference sample; the standard deviation or uncertainty was calculated by multiple parallel sampling tests. The contents of water, antioxidant and chlorophyll were measured after placing it in a refrigerator for 3 days. The test results are shown in table one.
| Moisture (%) | Antioxidant (mg/100g) | Chlorophyll (mg/100g) | |
| Reference sample initial value | 90.5±1.7 | 330.0±6.23 | 30.0±0.50 |
| Refrigerator 1 | 8.0±0.5 | 225.0±5.44 | 23.0±0.56 |
| Refrigerator 2 | 12.0±0.8 | 261.0±7.15 | 21.5±0.45 |
| Refrigerator 3 | 10.0±0.7 | 240.0±6.42 | 22.0±0.55 |
The reference sample for the preservation effect test comprises a water absorbing material, and a mixed solution of chlorophyll, a humectant and an antioxidant is absorbed in the water absorbing material. The consistency between the reference samples is good, the reference samples can be widely applied to the fresh-keeping effect evaluation of the refrigerator, the experimental error is small, and the repeatability is good.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (14)
1. A reference sample for testing the preservation effect is characterized by comprising a water absorbing material, wherein a mixed solution of chlorophyll, a humectant and an antioxidant is absorbed in the water absorbing material;
the water absorption material is selected from at least one of non-woven fabric, cotton cloth or polyester fabric;
the antioxidant is selected from at least one of L-ascorbic acid, butyl hydroxy anisol, dibutyl hydroxy toluene and propyl gallate;
the humectant is at least one selected from propylene glycol, glycerol and sorbitol;
the mass ratio of the antioxidant to the chlorophyll is 9-12: 1;
the solvent of the mixed solution is water; the water is deoxidized water and is dissolved with non-oxidation protective gas.
2. The reference sample for testing freshness effectiveness according to claim 1, wherein the water absorbing material is contained in a breathable water-proof bag.
3. The reference sample for the preservation effect test according to claim 2, wherein the air-permeable and water-impermeable bag has a size of 5-10cm × 8-15 cm.
4. The reference sample for testing freshness effectiveness according to claim 1, wherein the water absorbing material is a plurality of layers, and each layer or each plurality of layers is separated by a waterproof material.
5. The reference sample for testing freshness effectiveness according to claim 4,
the water absorbing material is stacked by 5-10 pieces.
6. The reference sample for testing freshness effectiveness according to claim 4, wherein the water absorbing material of each layer has the same size or different sizes.
7. The reference sample for testing freshness effectiveness according to claim 4, wherein the water absorbent material has a size of 3 to 8cm × 6 to 13 cm.
8. The reference sample for the preservation effect test according to claim 4, wherein the waterproof material is at least one selected from a PP film, a PE film and a PET film.
9. The reference sample for the preservation effect test according to claim 1, wherein the mass ratio of the antioxidant to the chlorophyll is 10-11: 1.
10. the reference sample for testing freshness effectiveness according to claim 1, wherein the non-oxidizing protective gas is nitrogen.
11. The method for preparing a reference sample for freshness test according to any one of claims 1 to 10, comprising the steps of:
contacting the water absorbing material, chlorophyll, humectant and antioxidant in a liquid environment.
12. The method for preparing a reference sample for testing freshness effectiveness according to claim 11, wherein the contact time is 4-8 min.
13. The method for preparing a reference sample for testing freshness effectiveness according to claim 11, wherein the contact time is 5-6 min.
14. Use of a reference for testing the freshness protection effect according to any one of claims 1 to 10 for testing the freshness protection effect of a refrigerator and/or freezer.
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