Method for determining vanillin by virtue of photonic-crystal molecular imprinting hydrogel

A technology of photonic crystals and molecular imprinting, which is applied in the measurement of color/spectral characteristics, etc., can solve the problems of troublesome processing, high requirements for instruments, and low sensitivity, and achieve low cost, strong anti-interference ability, and improved responsiveness and sensitivity. Effect

Inactive Publication Date: 2014-01-08
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pretreatment of these two methods is more troublesome, and the sensitivity is not very high, and the requirements for the instrument are relatively high.

Method used

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  • Method for determining vanillin by virtue of photonic-crystal molecular imprinting hydrogel
  • Method for determining vanillin by virtue of photonic-crystal molecular imprinting hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1 Uniformly disperse monodisperse silica microspheres (particle size 250nm) in absolute ethanol to form a uniform and stable colloidal dispersion system with a mass fraction of 2%. A 0.1 cm glass piece is completely submerged in 10 ml of the obtained silica colloidal dispersion system, placed in a quiet environment, and completely evaporated with anhydrous ethanol to obtain a photonic crystal template.

[0030] 2 Vanillin (2.0mmol), methacrylic acid (8.0mmol), ethylene glycol dimethacrylate (2.6mmol), azobisisobutyrocyanide (0.122mmol) and methanol (1.5ml) were mixed uniformly and ultrasonically Degassing, filling with nitrogen and deoxygenating, the molecular imprinting precursor solution is obtained.

[0031] 3 Clamp the photonic crystal template and plexiglass with tweezers and immerse in the molecular imprinting precursor solution in step 2. Through capillary action, after the molecular imprinting precursor solution is completely immersed between the glass plates an...

Embodiment 2

[0034] 1 Uniformly disperse monodisperse silica microspheres (particle size 300nm) in absolute ethanol to form a uniform and stable colloidal dispersion system with a mass fraction of 4%. A 0.1 cm glass piece is completely submerged in 10 ml of the obtained silica colloidal dispersion system, placed in a quiet environment, and completely evaporated with anhydrous ethanol to obtain a photonic crystal template.

[0035] 2 Vanillin (2.0mmol), methacrylic acid (10.0mmol), ethylene glycol dimethacrylate (2.8mmol), azobisisobutyronitrile (0.162mmol) and methanol (2.0ml) were mixed uniformly, ultrasonic Degassing, filling with nitrogen and deoxygenating, the molecular imprinting precursor solution is obtained.

[0036] 3 Clamp the photonic crystal template and plexiglass with tweezers and immerse in the molecular imprinting precursor solution in step 2. Through capillary action, after the molecular imprinting precursor solution is completely immersed between the glass plates and the ...

Embodiment 3

[0039]1 Uniformly disperse monodisperse silica microspheres (particle size 350nm) in absolute ethanol to form a uniform and stable colloidal dispersion system with a mass fraction of 5%. A 0.1 cm glass piece is completely submerged in 10 ml of the obtained silica colloidal dispersion system, placed in a quiet environment, and completely evaporated with anhydrous ethanol to obtain a photonic crystal template.

[0040] 2 Vanillin (2.0mmol), methacrylic acid (11.0mmol), ethylene glycol dimethacrylate (3.0mmol), azobisisobutyronitrile (0.182mmol) and methanol (2.0ml) were mixed uniformly and ultrasonicated Degassing, filling with nitrogen and deoxygenating, the molecular imprinting precursor solution is obtained.

[0041] 3 Clamp the photonic crystal template and plexiglass with tweezers and immerse in the molecular imprinting precursor solution in step 2. Through capillary action, after the molecular imprinting precursor solution is completely immersed between the glass plates an...

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Abstract

The invention discloses a method for determining vanillin by virtue of photonic-crystal molecular imprinting hydrogel. The method comprises the steps of firstly, preparing a silicon dioxide photonic crystal on a common glass sheet, and dissolving vanillin, methylpropenoic acid, ethylene glycol dimethacrylate and azodiisobutyronitrile in methyl alcohol to form a molecular imprinting precursor; permeating the precursor between organic glass and the photonic crystal, and performing ultraviolet polymerization; removing silicon dioxide by hydrofluoric acid, and soaking with methyl alcohol to remove vanillin; and forming the photonic-crystal molecular imprinting hydrogel on the organic glass. The photonic-crystal molecular imprinting hydrogel disclosed by the invention has the advantages of high response speed, high selectivity, high sensitivity, high anti-interference capacity and the like when being used for determining trace vanillin. The preparation method is simple, is low in cost and good in reproducibility, can be used for detecting vanillin in foods, and provides a technical support for detecting a food additive.

Description

technical field [0001] The invention relates to a photonic crystal molecularly imprinted hydrogel detection method for vanillin, which belongs to the technical field of food additives or food safety detection. Background technique [0002] Vanillin is a widely used edible spice with a strong milky aroma. It is widely used in various flavored foods that need to increase milk flavor, such as cakes, cold drinks, chocolate, candy; it can also be used in soap, toothpaste, perfume, rubber, plastic, and pharmaceuticals. At present, most foods use artificially synthesized vanillin as an additive. If a large amount of such vanillin is taken, it will bring certain toxic and side effects to the human body, so it is very important to quickly detect vanillin. Currently, detection methods for vanillin in laboratories or industrial fields mainly include ultraviolet spectroscopy and high performance liquid chromatography. However, the pretreatment of these two methods is cumbersome, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33C08F220/06C08F222/14C08F2/48C08J9/26
Inventor 彭海龙熊华王深琪董丽玲罗美赵强朱雪梅黎文建宁方建
Owner NANCHANG UNIV
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