Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of 2-hexenal absorption developing film

A technology of hexenal and color film, which is applied in material analysis, measuring device, instrument and other directions by observing the influence on chemical indicator, which can solve the problems of complicated and cumbersome analysis process.

Active Publication Date: 2021-05-14
FUZHOU UNIV
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the reported analytical methods for aldehydes, in order to achieve their high selectivity and high sensitivity detection, it is generally necessary to carry out complex pretreatment or derivatization steps on the samples, which makes the analysis process cumbersome and cumbersome.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of 2-hexenal absorption developing film
  • Preparation method of 2-hexenal absorption developing film
  • Preparation method of 2-hexenal absorption developing film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) 5.321 g polyvinyl alcohol (PVA1799 99%, M W =74885) was dissolved in 40 mL of deionized water, cooled to 50 °C, added with 10 ml of absolute ethanol, and stirred for 2 hours under constant temperature magnetic force to dissolve to obtain a casting solution. Use a 10mL syringe to draw 5mL onto a dry and clean Petri dish, and put it into a 45°C oven to dry it into a PVA film.

[0029] (2) Accurately weigh 0.0175g of methyl red sodium salt into a mixture of 25ml of water and 21ml of methanol, stir for 1 hour, then slowly add 4ml of glycerin, and stir evenly with magnetic force at room temperature to obtain an aldehyde indicator. Use a pipette gun to take 1.6ml of aldehyde indicator and drop it on the PVA film and dry it to obtain a chromogenic film. The dosage of the aldehyde indicator is to drop 0.08ml per square centimeter of film.

[0030] (3) Suspend the obtained chromogenic film to contain 50 μL of 89.47 mg / mL 2-hexenal solution and control the sensing distance ...

Embodiment 2

[0032] This example is used to illustrate the drawing of the standard curve for the detection of 2-hexenal by the colorimetric film.

[0033] Prepare a standard solution to be tested containing 2-hexenal in a concentration gradient, wherein the concentration of 2-hexenal is 20, 40, 60, 80, 100, 120, 140, 160, 180, 200 mg / ml. The chromogenic film of Example 1 was suspended until it contained 50 μL of the above-mentioned standard solution to be tested, and the sensing distance was controlled to be 0.7 cm, and the color was developed by adsorption at an ambient temperature of 65 °C for 60 min.

[0034] Use image J software to analyze the color of 2-hexenal before and after the response, and the specific steps are as follows: select the same measurement area that can include all the color-developing areas, and sequentially measure the color of the culture dish covered with the color-developing film before and after adsorption. The color area is the average gray value of each color...

Embodiment 3

[0036] (1) Dissolve 6.315 g of polyvinyl alcohol (PVA1799) in 45 mL of deionized water at 90 °C, cool down to 50 °C, add 15 ml of absolute ethanol, and stir for 2 h at constant temperature to obtain a casting solution. Use a 10mL syringe to draw 5mL onto a dry and clean Petri dish, and put it into a 45°C oven to dry it into a PVA film.

[0037] (2) Accurately weigh 0.0175g of methyl red sodium salt into a mixture of 25ml of water and 21ml of methanol, stir for 1 hour, then slowly add 4ml of glycerin, and stir evenly with magnetic force at room temperature to obtain an aldehyde indicator. Use a pipette gun to take 1.6ml of aldehyde indicator and drop it on the PVA film and dry it to obtain a chromogenic film. The dosage of the aldehyde indicator is to drop 0.08ml per square centimeter of film.

[0038](3) Suspend the obtained chromogenic film to contain 50 μL of 180 mg / mL 2-hexenal solution and control the sensing distance to 0.7 cm, and absorb and develop color at an ambient ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a preparation method of a 2-hexenal absorption developing film. The method comprises the following steps of (1) stirring and dissolving polyvinyl alcohol in deionized water at 75-95 DEG C, then adding ethanol at 45-65 DEG C, and stirring at constant temperature for 2-4 hours to obtain a membrane casting solution; extracting 5-10ml of the membrane casting solution by using an injector, putting the membrane casting solution into a clean culture dish, and drying to obtain a PVA membrane; and (2) uniformly stirring the methyl red sodium salt with water, methanol and glycerol (the volume ratio of water to methanol to glycerol is 6.25: 5.25: 1) to obtain the aldehyde indicator; and dropwise adding an aldehyde indicator on the PVA film, and drying to obtain the color developing film. The product prepared by the method has good absorption and color development capability on 2-hexenal, the raw material is a very safe high-molecular organic material, and the product has wide application prospects in the fields of food analysis and detection, high-molecular chemical industry and the like.

Description

technical field [0001] The invention designs a method for preparing a color-developing film for hexenal adsorption, and belongs to the field of food analysis and detection. Background technique [0002] When evaluating the quality of food, volatile substances are often one of the important indicators. Among the odor volatile compounds of many vegetables and fruits (apple, tomato, grape, etc.) during harvest and storage, 2-hexenal contributes a lot to its aroma. 2-Hexenal is a common constituent of plants and is therefore also called leaf aldehyde. In fact, it is found in all vegetables and fruits at concentrations of 3-40ppm. Dierkes studied the quality of olive oil and the detection of volatile components, and found that in olive oil of different qualities, its quality is related to the content of aldehydes including Z-3-hexenal and E-2-hexenal positively correlated. Zhang Xin et al. used the electronic nose system to evaluate the fruits of different maturity levels of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/01
CPCG01N21/78G01N21/01
Inventor 英晓光肖玲玲杜鑫星何界元
Owner FUZHOU UNIV