CN114646636A - PH response film material, preparation method thereof and preparation method of pH indicator - Google Patents
PH response film material, preparation method thereof and preparation method of pH indicator Download PDFInfo
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- CN114646636A CN114646636A CN202210403944.8A CN202210403944A CN114646636A CN 114646636 A CN114646636 A CN 114646636A CN 202210403944 A CN202210403944 A CN 202210403944A CN 114646636 A CN114646636 A CN 114646636A
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- 239000000463 material Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 230000004044 response Effects 0.000 title claims abstract description 20
- 239000000419 plant extract Substances 0.000 claims abstract description 26
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- 238000000034 method Methods 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 16
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- 238000002156 mixing Methods 0.000 claims abstract description 12
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- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 claims description 2
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- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 1
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- 229940012189 methyl orange Drugs 0.000 description 1
- CEQFOVLGLXCDCX-WUKNDPDISA-N methyl red Chemical compound C1=CC(N(C)C)=CC=C1\N=N\C1=CC=CC=C1C(O)=O CEQFOVLGLXCDCX-WUKNDPDISA-N 0.000 description 1
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- PRZSXZWFJHEZBJ-UHFFFAOYSA-N thymol blue Chemical compound C1=C(O)C(C(C)C)=CC(C2(C3=CC=CC=C3S(=O)(=O)O2)C=2C(=CC(O)=C(C(C)C)C=2)C)=C1C PRZSXZWFJHEZBJ-UHFFFAOYSA-N 0.000 description 1
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Images
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/775—Indicator and selective membrane
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- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Polymers & Plastics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a pH response film material, a preparation method thereof and a preparation method of a pH indicator. A preparation method of a pH indicator mainly comprises the following steps: s1: sieving the plant waste by a 40-100 mesh sieve to obtain plant waste powder, wherein the color of the plant waste is selected from any one of red, orange, blue, yellow, green, purple and orange; s2: mixing the plant waste powder obtained in the step S1 with a solvent, continuously stirring for 2-24h at 30-60 ℃, centrifuging, filtering, concentrating, and freeze-drying to obtain a plant extract; s3: and (3) selecting deionized water and/or absolute ethyl alcohol to dilute the plant extract prepared in the step S2 to neutral pH, so as to obtain the plant extract pH indicator with the weight percentage of 0.1-10%. The invention discloses a pH response film material, a preparation method thereof and a preparation method of a pH indicator, which are used for reducing the harm of the traditional chemical acid-base indicator to detection and experimenters and ensuring the sensitive indication effect of the pH indicator in the adjusting and measuring processes.
Description
Technical Field
The invention relates to the field of resource utilization of biomass wastes, in particular to a pH response film material and a preparation method thereof as well as a preparation method of a pH indicator.
Background
The adjustment and determination of pH plays an important role in laboratories and some factories. Currently, the adjustment and measurement of pH in laboratories and factories are mainly determined by titration with pH indicators (such as phenolphthalein, methyl orange, etc.) or by rapid and accurate measurement using pH test paper, pH meter instruments.
The pH test paper mainly utilizes chemical acid-base indicators such as bromocresol green, methylene blue, methyl red, thymol blue and the like, the substances can have specific colors in a certain pH range, and a wider pH value range can be measured by adjusting the component proportion. However, studies have shown that most of these chemical acid-base indicators are toxic or carcinogenic, which can be harmful to the body of the laboratory personnel who routinely contact the detection of such substances.
The measurement using the pH meter requires frequent calibration of the pH meter in addition to purchase of expensive equipment, and maintenance and repair of the pH meter also require high expenses, which is a challenge for the detection expenses of some small enterprises.
The existing plants contain a large amount of natural pigments such as anthocyanin, betaine, carotenoid and curcumin, and researches prove that the natural pigments such as anthocyanin, betaine, carotenoid and curcumin have sensitive and rapid response to pH. Therefore, a safe, nontoxic, cheap and easily-obtained pH indicator is needed to reduce the harm of the traditional chemical acid-base indicator to detection and experimenters, ensure the sensitivity of the pH indicator in the adjusting and measuring processes and realize the application of the pH indicator in pH response of natural pigments such as anthocyanin, betaine, carotenoid, curcumin and the like.
Disclosure of Invention
The invention discloses a pH response film material, a preparation method thereof and a preparation method of a pH indicator, which are used for reducing the harm of the traditional chemical acid-base indicator to detection and experimenters and ensuring the sensitive indication effect of the pH indicator in the adjusting and measuring processes.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of a pH indicator mainly comprises the following steps:
s1: screening plant waste through a 40-100-mesh sieve to obtain plant waste powder, wherein the color of the plant waste is selected from any one of red, orange, blue, yellow, green, purple and orange;
s2: mixing the plant waste powder obtained in the step S1 with a solvent, continuously stirring for 2-24h at 30-60 ℃, centrifuging, filtering, concentrating, and freeze-drying to obtain a plant extract;
s3: and (3) selecting deionized water and/or absolute ethyl alcohol to dilute the plant extract prepared in the step S2 to neutral pH, so as to obtain the plant extract pH indicator with the weight percentage of 0.1-10%.
Further, the plant waste is at least one selected from the group consisting of pitaya peel, mango peel, grape peel, orange peel, grapefruit peel, pomegranate peel and kitchen waste.
Further, the kitchen waste is selected from at least one of red cabbage leaves, eggplant peel and carrot peel.
Further, in step S2, the weight ratio of the solvent to the plant waste powder is (200-): 1.
further, in step S1, before sieving, the plant waste is dried at 30-60 deg.C for 12-72 h.
Further, the solvent is at least one selected from deionized water, absolute ethyl alcohol, ethyl acetate, methyl acetate, dimethyl sulfoxide, methanol and isopropanol.
The preparation method of the pH indicator disclosed by the invention has the beneficial effects that: the plant waste is reasonably utilized to prepare the plant extract pH indicator, so that the utilization of the traditional waste is realized, and the problem of environmental pollution caused by waste discarding is reduced; meanwhile, the anthocyanin, the betaine, the carotenoid, the curcumin and other active substances in the plant waste have good antibacterial and antioxidant functions, and the anthocyanin, the betaine, the carotenoid, the curcumin and other active substance components in the plant waste have conjugated structures and are subjected to conversion reaction under different pH values, so that the maximum absorption wavelength of the anthocyanin, the betaine, the carotenoid, the curcumin and other active substance components changes, thereby showing different colors.
A pH response film material comprises the following raw materials in parts by weight: 5-25 parts of plant extract pH indicator and 75-95 parts of degradable film forming agent;
the plant extract pH indicator is prepared by adopting the preparation method of the plant extract pH indicator in any one of claims 1-6.
Further, the degradable film forming agent is selected from at least one of polyvinyl alcohol, polyvinyl acetate, polylactic acid, chitosan, starch derivatives, cellulose derivatives, agar and carrageenan.
A method for preparing a pH response film material comprises the following steps:
s1: mixing the plant extract pH indicator and the film-forming agent, and stirring for 2-12h at the speed of 300-800 r/min;
s2: and (5) placing the mixture prepared in the step S1 in a drying oven at the temperature of 40-60 ℃ for treatment for 24-72h to prepare the pH response film material.
The invention discloses a pH response film material and a preparation method thereof, which have the following beneficial effects: the pH response film material is prepared by adopting the nontoxic and degradable plant extract pH indicator, so that the prepared pH response film material has the characteristics of safety, no toxicity, greenness and environmental protection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a pH indicator and absorption spectrum of pitaya peel extract in example 8 of the disclosed pH indicator;
FIG. 2 is a pH indicator and absorption spectrum of grape skin extract in example 1 of the disclosed pH indicator;
FIG. 3 is a graph showing the color change of the polyvinyl alcohol film material of grape skin extract at different pH values in example 1 of the pH responsive film material disclosed in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 3 of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples of pH indicators
Example 1 of pH indicator: the preparation method comprises the following steps:
s1: cleaning and airing purple fresh grape skin waste, placing the grape skin waste in a 45 ℃ forced air drying oven for drying treatment for 48 hours, then crushing the dried grape skin waste by using a multifunctional crusher, and sieving the crushed grape skin waste by using a 60-mesh sieve to obtain grape skin waste powder;
s2: mixing 10g of the grape skin waste powder prepared in the step S1 with 150g of deionized water, stirring for 1h at 500r/min, then ball-milling for 10min by using a ball mill, stirring for 4h at 500r/min, and carrying out centrifugal filtration to obtain a grape skin extracting solution;
freeze drying the prepared grape skin extract at-40 deg.C until deionized water is completely removed to obtain grape skin extract;
s3: dissolving 1.0g of the grape skin extract prepared in the step S2 in 49g of a mixed solution of deionized water and absolute ethyl alcohol (the weight ratio of the deionized water to the absolute ethyl alcohol is 1:1), and placing the mixture in a brown bottle for storage to obtain a plant extract pH indicator;
the color change mechanism of the pH indicator under different pH environments is as follows: the grape skin contains a large amount of anthocyanin, and with the change of pH, the anthocyanin is protonated or deprotonated and simultaneously undergoes corresponding rearrangement or isomerization, and the change changes the chemical structure of the anthocyanin, so that the absorption of light is changed, and further, the color is changed.
Example 2 of pH indicator: the preparation method comprises the following steps:
s1: example 1 with pH indicator;
s2: mixing 10g of the grape skin waste powder prepared in the step S1 with 200g of deionized water, stirring for 1h at 500r/min, then ball-milling for 10min by using a ball mill, stirring for 4h at 500r/min, and carrying out centrifugal filtration to obtain a grape skin extracting solution;
freeze drying the prepared grape skin extract at-40 deg.C until deionized water is completely removed to obtain grape skin extract;
s3: same as example 1 of the pH indicator.
Example 3 of pH indicator: the preparation method comprises the following steps:
s1: example 1 with pH indicator;
s2: mixing 20g of the grape skin waste powder prepared in the step S1 with 200g of deionized water, stirring for 1h at 500r/min, then ball-milling for 10min by using a ball mill, stirring for 4h at 500r/min, and carrying out centrifugal filtration to obtain a grape skin extracting solution;
freeze drying the prepared grape skin extract at-40 deg.C until deionized water is completely removed to obtain grape skin extract;
s3: same as example 1 of the pH indicator.
Example 4 of pH indicator: the preparation method comprises the following steps:
s1: example 1 with pH indicator;
s2: mixing 20g of the grape skin waste powder prepared in the step S1 with 200g of a mixed solution of absolute ethyl alcohol and ethyl acetate (the weight ratio of the absolute ethyl alcohol to the ethyl acetate is 1:1), stirring at 400r/min for 1h, then ball-milling for 10min by using a ball mill, stirring at 600r/min for 4h, and carrying out centrifugal filtration to obtain a grape skin extracting solution;
freeze drying the prepared grape skin extract at-40 deg.C until deionized water is completely removed to obtain grape skin extract;
s3: same as example 1 of the pH indicator.
Example 5 of pH indicator: the preparation method comprises the following steps:
s1: cleaning and airing purple fresh eggplant peel waste, placing the eggplant peel waste in a 45 ℃ forced air drying oven for drying treatment for 48 hours, then crushing the dried eggplant peel waste by using a multifunctional crusher, and sieving the crushed eggplant peel waste by using a 60-mesh sieve to obtain eggplant peel waste powder;
s2: example 1 with pH indicator;
s3: same as example 1 of the pH indicator.
Example 6 of pH indicator: the preparation method comprises the following steps:
s1: taking orange fresh carrot peel waste, cleaning and airing, placing in a 45-DEG C forced air drying oven for drying treatment for 48h, then crushing the dried carrot peel waste by using a multifunctional crusher, and sieving by using a 60-mesh sieve to obtain carrot peel waste powder;
s2: example 1 with pH indicator;
s3: same as example 1 of the pH indicator.
Example 7 of pH indicator: the preparation method comprises the following steps:
s1: taking fresh orange pomegranate rind waste, cleaning, airing, placing in a forced air drying oven at 45 ℃ for drying treatment for 48h, then crushing the dried pomegranate rind waste by using a multifunctional crusher, and sieving by using a 60-mesh sieve to obtain pomegranate rind waste powder;
s2: example 1 with pH indicator;
s3: same as example 1 of the pH indicator.
Example 8 of pH indicator: the preparation method comprises the following steps:
s1: taking red fresh pitaya peel waste, cleaning and airing, placing in a 45 ℃ blast drying oven for drying treatment for 48 hours, then crushing the dried pitaya peel waste by using a multifunctional crusher, and sieving by using a 60-mesh sieve to obtain pitaya peel waste powder;
s2: example 1 with pH indicator;
s3: same as example 1 of the pH indicator.
Example 9 of pH indicator: the preparation method comprises the following steps:
s1: example 1 with pH indicator;
s2: example 1 with pH indicator;
s3: 1.0g of the grape skin extract obtained in step S2 was dissolved in 49g of absolute ethanol and stored in a brown bottle to obtain a plant extract pH indicator.
Example 10 of pH indicator: the preparation method comprises the following steps:
s1: example 1 with pH indicator;
s2: example 1 with pH indicator;
s3: 1.0g of the grape skin extract obtained in step S2 was dissolved in 49g of deionized water and stored in a brown bottle to obtain a plant extract pH indicator.
pH indicator Performance test
The plant extract pH indicators prepared in the pH indicator examples 1 and 8 are subjected to performance detection by using a Hitachi UH5300 double-beam ultraviolet spectrophotometer, the absorbance of the prepared plant extract pH indicator in the range of 400-700nm is measured, and a real image is shot, wherein the detection result is shown in the graph 1 and the graph 2.
Table 1: color description of FIG. 1 versus pH
| |
7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Colour(s) | Pink colour | Light yellow | Light red | Yellow green | Light yellow green | Light yellow | Yellow colour |
As can be seen from fig. 1 and table 1, in the pH range of 7-13, the color of the pitaya peel extract pH indicator gradually becomes lighter from pink and then becomes yellowish, and the color change is not obvious enough, because the pitaya peel contains plant albumin which is rare in plants, the solubility of the pitaya peel extract pH indicator is reduced in an acidic environment to generate precipitation, so that the pH indicator cannot be used in acidity, and meanwhile, the color change of the pitaya peel extract pH indicator is not obvious at different pH, which limits the application of the pitaya peel extract pH indicator.
Table 2: color description of FIG. 2 versus pH
| |
7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Colour(s) | Pale pink colour | Light greenish black | Light black green | Yellow green | Light yellow green | Light brown yellow | Brown |
| pH value | |||||||
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| Colour(s) | Pale pink colour | Light pink color | Pink colour | Light red | Red colour | Bright red color | Deep red color |
As can be seen from table 2 and fig. 2, the pH indicator of the grape skin extract shows a distinct color change in the pH range of 1 to 13, and the color difference is distinct, so that the pH value can be sensitively reflected.
Examples of pH responsive film materials
Example 1 of a pH-responsive film Material
A method for preparing a pH response film material comprises the following steps:
s1: mixing 5g plant extract pH indicator prepared by the method of example 1 with 95g 4 wt% polyvinyl alcohol solution, and stirring at 500r/min for 2 h;
s2: 20g of the mixture obtained in step S1 was poured into a petri dish (d: 90mm), and the petri dish was placed in a dry-heat oven at 40 ℃ for 48 hours to obtain a pH-responsive thin film material.
Example 2 of a pH-responsive film Material
A method for preparing a pH response film material comprises the following steps:
s1: mixing 5g plant extract pH indicator prepared by the method of example 1 with 95g 4 wt% polyvinyl alcohol solution, and stirring at 500r/min for 2 h;
s2: same as example 1 of the pH responsive film material.
Example 3 of a pH responsive film Material
A method for preparing a pH response film material comprises the following steps:
s1: mixing 5g of plant extract pH indicator prepared by the method of example 1 with 65g of 4 wt% polyvinyl alcohol solution, and stirring at 600r/min for 2 h;
s2: same as example 1 of the pH responsive film material.
pH response film material property detection
The performance of the pH responsive film material prepared in the above pH responsive film material example 2 was tested, and the test results are shown in fig. 3.
Table 3: color description of FIG. 3 versus pH
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Colour(s) | Deep red color | Red colour | Dark brown color | Brown colour | Brown colour | Light brown | Light brown |
| pH value | |||||||
| 8 | 9 | 10 | 11 | 12 | 13 | ||
| Colour(s) | Light brown green | Light black green | Blackish green color | Yellow green | Light brown yellow | Brown yellow |
As can be seen from Table 3 and FIG. 3, the pH of the film was in the range of 1-13, and the film exhibited a color change similar to that of the pH indicator of the grape skin extract, indicating that the addition of the extract to the material did not destroy the structure of the material and did not affect the effect of the extract on the pH indicatorResponse of pH. H is generated in the food spoilage process2S, volatile basic nitrogen and other chemical substances can cause the pH value of the food to change, so that the prepared pH response film material can be applied to an intelligent food packaging material according to the characteristic, and the quality and the shelf life of the food can be directly judged through the color change of the film.
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 (9)
1. A preparation method of a pH indicator is characterized by mainly comprising the following steps:
s1: screening fresh plant waste through a 40-100-mesh sieve to obtain plant waste powder, wherein the color of the plant waste is selected from any one of red, orange, blue, yellow, green, purple and orange;
s2: mixing 10-20 parts by weight of the plant waste powder prepared in the step S1 with 150-200 parts by weight of solvent, continuously stirring for 2-24h at the temperature of 30-60 ℃, and performing centrifugal filtration and freeze-drying to obtain a plant extract;
s3: and (3) selecting deionized water and/or absolute ethyl alcohol to dilute the plant extract prepared in the step S2 to neutral pH, so as to obtain the plant extract pH indicator with the weight percentage of 0.1-10%.
2. The method of claim 1, wherein the plant waste is at least one selected from the group consisting of dragon fruit peel, mango peel, grape peel, orange peel, grapefruit peel, pomegranate peel, and kitchen waste.
3. The method of claim 2, wherein the kitchen waste is at least one selected from the group consisting of red cabbage leaves, eggplant peel, and carrot peel.
4. The method of claim 1, wherein in step S2, the weight ratio of the solvent to the plant waste powder is (15-20): (1-2).
5. The method of claim 1, wherein the plant waste is dried at 30-60 ℃ for 12-72 hours before being screened in step S1.
6. The method of claim 1, wherein the solvent is at least one selected from the group consisting of deionized water, absolute ethanol, ethyl acetate, methyl acetate, dimethyl sulfoxide, methanol, and isopropyl alcohol.
7. A pH response film material is characterized by comprising the following raw materials in parts by weight: 5-25 parts of plant extract pH indicator and 75-95 parts of degradable film forming agent;
the plant extract pH indicator is prepared by adopting the preparation method of the pH indicator according to any one of claims 1 to 6.
8. The pH-responsive film material of claim 7, wherein the degradable film forming agent is selected from at least one of polyvinyl alcohol, polyvinyl acetate, polylactic acid, chitosan, starch derivatives, cellulose derivatives, agar, and carrageenan.
9. The method for preparing a pH-responsive film material according to any one of claims 7 to 8, comprising the steps of:
s1: mixing the plant extract pH indicator and the film-forming agent, and stirring for 2-12h at the speed of 300-800 r/min;
s2: and (5) placing the mixture prepared in the step S1 in a drying oven at the temperature of 40-60 ℃ for treatment for 24-72h to prepare the pH response film material.
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| CN115581252A (en) * | 2022-10-20 | 2023-01-10 | 海南省农业科学院农产品加工设计研究所 | Visual ClO 2 Slow-release preservative and preparation method thereof |
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