Preparation method and application of polymer hydrogel for detecting ester compounds
By preparing polymer hydrogels and utilizing atomized contact reactions, the problems of cumbersome operation and environmental pollution in the detection of ester compounds have been solved, enabling rapid, simple, and sensitive detection of ester compounds.
Patent Information
- Application Number
- CN202411089317.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-08
- Publication Date
- 2026-02-10
AI Technical Summary
Existing methods for detecting ester compounds require complex instruments or generate chemical waste, are cumbersome to operate and are not environmentally friendly, making it difficult to achieve rapid, simple and sensitive detection.
A polymer hydrogel was prepared by reacting polyethylene glycol, polyvinylpyrrolidone, acrylamide with an indicator solution and an initiator to form a transparent hydrogel. The hydrogel was then atomized to contact with ester compounds, and detection was performed using the color change reaction of the indicator.
It enables rapid, simple, and sensitive detection of ester compounds without requiring large amounts of reagents, is environmentally friendly, and provides stable and reliable detection results.
Smart Images
Figure CN121495052A_ABST
Abstract
Description
Technical Field
[0001] This application relates to a method for preparing a polymer hydrogel for detecting ester compounds and its application, belonging to the field of rapid detection of ester compounds. Background Technology
[0002] Esters are a class of organic compounds formed by the esterification reaction of alcohols and carboxylic acids. Many esters possess aromas, such as ethyl acetate and ethyl butyrate, and are widely used in the food and perfume industries. Esters are generally considered to be slightly to moderately toxic; however, exposure to high concentrations can still be harmful to humans, causing symptoms such as headaches, drowsiness, and dizziness.
[0003] Currently, methods for detecting ester compounds include gas chromatography, gas chromatography-mass spectrometry (GC-MS), high-performance liquid chromatography (HPLC), and liquid chromatography-tandem mass spectrometry (LC-MS). Applications requiring ester compound detection include air, automotive gasoline, paint, perfume, and spirits. While these methods offer high sensitivity and accuracy, they require specialized instruments and are relatively cumbersome to operate. Spectrophotometry uses chemical colorimetric reagents to react with ester compounds under specific conditions to generate color products, but this process requires large amounts of reagents, producing chemical waste and harming the environment. These two methods are limited in practical applications; therefore, there is a need to develop a simple, sensitive, and visual colorimetric detection method for the rapid detection of ester compounds. Summary of the Invention
[0004] The purpose of this invention is to provide an application of polymer hydrogel in the rapid detection of ester compounds. This hydrogel has good stability, high sensitivity, can be used without the need for a large amount of reagents, is environmentally friendly, and has a wide range of applications.
[0005] According to one aspect of this application, a method for preparing a polymer hydrogel for detecting ester compounds is provided, the method comprising at least the following steps:
[0006] Step 1: Disperse polyethylene glycol, polyvinylpyrrolidone, and acrylamide in water, add indicator solution and initiator, react to obtain a transparent hydrogel;
[0007] Step 2: Immerse the transparent hydrogel obtained in Step 1 in water and dry it to obtain a polymer hydrogel for detecting ester compounds;
[0008] The indicator solution is a mixture of phenolphthalein and thymol blue.
[0009] Optionally, the mass ratio of polyethylene glycol, polyvinylpyrrolidone, and acrylamide is 1:(1.2-1.8):(3-8).
[0010] Optionally, the concentration of phenolphthalein in the indicator solution is 2–4 g / L.
[0011] Optionally, the concentration of phenolphthalein in the indicator solution can be independently selected from any value among 2.0 g / L, 2.5 g / L, 3.0 g / L, 3.5 g / L, 4.0 g / L, or a range between any two of the above points.
[0012] Optionally, the concentration of thymol blue in the indicator solution is 1–2 g / L.
[0013] Optionally, the concentration of thymol blue in the indicator solution can be independently selected from any value among 1.0 g / L, 1.2 g / L, 1.4 g / L, 1.6 g / L, 1.8 g / L, 2.0 g / L, or a range between any two of the above points.
[0014] Optionally, the initiator is at least one of hydrogen peroxide, cerium ammonium nitrate, and potassium persulfate.
[0015] Optionally, the concentration of the initiator is 0.02 to 0.10 mol / L.
[0016] Optionally, the concentration of the initiator may be independently selected from any value among 0.02 mol / L, 0.04 mol / L, 0.06 mol / L, 0.08 mol / L, 0.10 mol / L, or a range between any two of the above points.
[0017] Optionally, the reaction conditions in step one are as follows:
[0018] The reaction was carried out under ultraviolet light irradiation;
[0019] The reaction time is 5 to 10 hours;
[0020] The reaction temperature is 50–80°C.
[0021] Optionally, the drying time in step two is 8 to 12 hours;
[0022] The drying temperature is 30-35℃.
[0023] According to another aspect of this application, an application of a polymer hydrogel for detecting ester compounds is provided, wherein the ester compound is mixed with an alkali, and the mixture is atomized to react with the polymer hydrogel for detecting the ester compound.
[0024] Optionally, the ester compound is selected from at least one of ethyl acetate, ethyl butyrate, ethyl valerate, ethyl hexanoate, and ethyl phenylacetate.
[0025] Optionally, the concentration of the ester compound is 10–50 mg / L.
[0026] Optionally, the alkali is selected from at least one of sodium hydroxide and potassium hydroxide.
[0027] Optionally, the concentration of alkali in the mixture is 2 to 5 g / L.
[0028] Optionally, the atomization time is 1 to 5 minutes.
[0029] Optionally, the contact reaction time is 5 to 10 minutes.
[0030] The beneficial effects that this application can produce include:
[0031] 1) The polymer hydrogel constructed for the detection of ester compounds has high stability and good repeatability because it is rich in water molecules and can provide an aqueous environment for the indicator used in the detection of ester compounds.
[0032] 2) The polymer hydrogel constructed for the detection of ester compounds does not require the use of a large amount of reaction reagents, making it environmentally friendly.
[0033] 3) The reaction via atomization takes only 1 minute to obtain obvious color change results, with high detection sensitivity and simple operation. Attached Figure Description
[0034] Figure 1 The colorimetric effect of polymer-type hydrogels for detecting ester compounds in this application; Detailed Implementation
[0035] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.
[0036] Unless otherwise specified, all raw materials used in the embodiments of this application were purchased through commercial channels.
[0037] Example 1.
[0038] Polyethylene glycol, polyvinylpyrrolidone, and acrylamide were dispersed in water at a mass ratio of 1:1.2:4, with 100 mg of polyethylene glycol corresponding to 20 mL of water. Phenolphthalein and thymol blue, at concentrations of 2 g / L and 1 g / L respectively, were added in volumes of 2 mL and 1 mL, respectively. After thorough mixing, 0.05 mol / L hydrogen peroxide was added to the mixture, and the solution was reacted at 60°C under ultraviolet irradiation for 10 hours to obtain a transparent hydrogel. The transparent hydrogel was then immersed in deionized water to remove unreacted monomers and initiators, and dried in an oven at 35°C for 10 hours to constant weight, yielding a polymeric hydrogel suitable for testing ester compound gases.
[0039] Example 2.
[0040] Polyethylene glycol, polyvinylpyrrolidone, and acrylamide were dispersed in water at a mass ratio of 1:1.5:3, with 100 mg of polyethylene glycol corresponding to 20 mL of water. Phenolphthalein (3 g / L) and thymol blue (1 g / L) were added in volumes of 2 mL and 1 mL, respectively. After thorough mixing, 0.10 mol / L hydrogen peroxide was added to the mixture. The mixture was reacted at 80°C under ultraviolet light irradiation for 8 hours to obtain a transparent hydrogel. The transparent hydrogel was then immersed in deionized water to remove unreacted monomers and initiators, and dried in an oven at 35°C for 12 hours to constant weight, yielding a polymeric hydrogel suitable for testing ester compound gases.
[0041] Example 3.
[0042] Polyethylene glycol, polyvinylpyrrolidone, and acrylamide were dispersed in water at a mass ratio of 1:1.8:3, with 100 mg of polyethylene glycol corresponding to 20 mL of water. Phenolphthalein and thymol blue, at concentrations of 4 g / L and 2 g / L respectively, were added in volumes of 2 mL and 1 mL. After thorough mixing, 0.02 mol / L hydrogen peroxide was added to the mixture, and the solution was reacted at 50°C under ultraviolet irradiation for 5 hours to obtain a transparent hydrogel. The transparent hydrogel was then immersed in deionized water to remove unreacted monomers and initiators, and dried in an oven at 35°C for 8 hours to constant weight, yielding a polymeric hydrogel suitable for testing ester compound gases.
[0043] Example 4.
[0044] Using the polymer hydrogel prepared in Example 1, 1 mL of the test solution (ethanol as solvent) containing 10 mg / L ethyl acetate and ethyl butyrate was taken, and sodium hydroxide was added to make the concentration 2 g / L. Simultaneously, 1 mL of ethanol was prepared, and sodium hydroxide was also added to make the concentration 2 g / L. After mixing thoroughly, the liquid was sprayed onto the polymer hydrogel via atomization for 1 minute, followed by a 5-minute holding period. The color change of the sample hydrogel was recorded. Figure 1 As shown, the hydrogel containing ester compounds is noticeably darker in color.
[0045] Comparative Example 1
[0046] The polymeric hydrogel prepared using Example 1 does not come into contact with ester compounds, see... Figure 1 Control group.
[0047] Comparative Example 2
[0048] A mixed indicator solution of 2 mL phenolphthalein (2 g / L) and 1 mL thymol blue (1 g / L) was spotted onto porous filter paper and dried for later use. Sodium hydroxide was added to an ethanol solution of 10 ppm ethyl acetate to achieve a sodium hydroxide concentration of 2 g / L. This solution was then atomized and sprayed onto the indicator for 1 min, followed by 5 min. No change in the indicator color was observed.
[0049] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.
Claims
1. A method for preparing a polymer hydrogel for detecting ester compounds, characterized in that, The preparation method includes at least the following steps: Step 1: Disperse polyethylene glycol, polyvinylpyrrolidone, and acrylamide in water, add indicator solution and initiator, react to obtain a transparent hydrogel; Step 2: Immerse the transparent hydrogel obtained in Step 1 in water and dry it to obtain a polymer hydrogel for detecting ester compounds; The indicator solution is a mixture of phenolphthalein and thymol blue.
2. The preparation method according to claim 1, characterized in that, The mass ratio of polyethylene glycol, polyvinylpyrrolidone, and acrylamide is 1:(1.2-1.8):(3-8).
3. The preparation method according to claim 1, characterized in that, The concentration of phenolphthalein in the indicator solution is 2–4 g / L; Preferably, the concentration of thymol blue in the indicator solution is 1-2 g / L.
4. The preparation method according to claim 1, characterized in that, The initiator is at least one of hydrogen peroxide, cerium ammonium nitrate, and potassium persulfate. Preferably, the concentration of the initiator is 0.02 to 0.10 mol / L.
5. The preparation method according to claim 1, characterized in that, The reaction conditions in step one are as follows: The reaction was carried out under ultraviolet light irradiation; The reaction time is 5 to 10 hours; The reaction temperature is 50–80°C.
6. The preparation method according to claim 1, characterized in that, The drying time in step two is 8 to 12 hours; The drying temperature is 30-35℃.
7. An application of a polymer hydrogel for detecting ester compounds, characterized in that, An ester compound is mixed with an alkali, and the mixture is then atomized to react with a polymer hydrogel used to detect the ester compound. The hydrogel for detecting ester compounds is prepared by any one of the preparation methods in claims 1 to 6.
8. The application according to claim 7, characterized in that, The ester compound is selected from at least one of ethyl acetate, ethyl butyrate, ethyl valerate, ethyl hexanoate, and ethyl phenylacetate; Preferably, the concentration of the ester compound is 10–50 mg / L. Preferably, the alkali is selected from at least one of sodium hydroxide and potassium hydroxide; Preferably, the concentration of alkali in the mixture is 2-5 g / L.
9. The application according to claim 7, characterized in that, The atomization time is 1 to 5 minutes.
10. The application according to claim 7, characterized in that, The contact reaction time is 5 to 10 minutes.