Preparation method and application of novel melamine molecule imprinting adsorbing material

A technology of melamine and molecular imprinting, which is applied to the analysis of materials, material excitation analysis, chemical instruments and methods, etc., can solve the problems of uneven distribution of imprinted sites, reduce the utilization rate of imprinted sites, and the mechanical properties of template leakage, and achieve Effects of high selectivity, excellent mechanical stability, and good physical and chemical stability

Inactive Publication Date: 2012-08-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires simple equipment and strong universality, but usually has the following problems: (1) The controllability is poor during the grinding process, and some irregular particles are inevitably generated, and some imprinted spots are destroyed at the same time
The qualified particles obtained after screening are generally less than 50%, resulting in obvious waste; (2) Excessive embedding of template molecules, difficulty in elution, template leakage and low mechanical properties; (3) Uneven distribution of imprinted sites , some of them are located above the particle pores, and their mass transfer rate is faster, while others are embedded in the polymer body, which is affected by steric hindrance, has poor accessibility, and the rate of recombining template molecules is slow, thereby reducing the number of imprinted sites. Utilization of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Loofah pretreatment: Loofah comes from the fruit of loofah, which is obtained by peeling and removing the core. Cut the loofah into small pieces, wash with water, dry in vacuum, crush, and pass through an 80-mesh sieve.

[0021] (2) Alkali treatment of loofah: the loofah of pulverizing is pressed 50% of gross mass, is that 5% NaOH solution and 20% ethanol solution are mixed and immersed in azeotropic 0.5 h with concentration, constantly adds NaOH solution and during azeotropy Ethanol mixed solution, to maintain the volume of the solution, the loofah is completely soaked, washed with deionized water until the pH is 7 after cooling, dried at 60°C after suction filtration, to obtain alkalized loofah.

[0022] (3) Preparation of molecular adsorption material imprinted with melamine on the surface of loofah: Weigh 2g alkalized loofah, 0.08g melamine: 10mL ethanol-water (volume ratio 4:1), 1.0mL methacrylic acid, 6mL ethylene glycol dimethyl Acrylic ester, 0.1g azobisisob...

Embodiment 2

[0025] (1) Loofah pretreatment: Loofah comes from the fruit of loofah, which is obtained by peeling and removing the core. Cut the loofah into small pieces, wash with water, dry in vacuum, crush, and pass through an 80-mesh sieve.

[0026] (2) Alkali treatment of loofah: the loofah of pulverizing is pressed 50% of gross mass, is that 5% NaOH solution and 20% ethanol solution are mixed and immersed in azeotropic 0.5 h with concentration, constantly adds NaOH solution and during azeotropy Ethanol mixed solution, to maintain the volume of the solution, the loofah is completely soaked, washed with deionized water until the pH is 7 after cooling, dried at 60°C after suction filtration, to obtain alkalized loofah.

[0027] (3) Preparation of molecular adsorption material imprinted with melamine on the surface of loofah: Weigh 2g alkalized loofah, 0.1g melamine: 12mL ethanol-water (volume ratio 4:1), 1.0mL methacrylic acid, 7.0mL ethylene glycol dimethyl Acrylic acid ester, 0.15g azo...

Embodiment 3

[0030] (1) Loofah pretreatment: Loofah comes from the fruit of loofah, which is obtained by peeling and removing the core. Cut the loofah into small pieces, wash with water, dry in vacuum, crush, and pass through an 80-mesh sieve.

[0031] (2) Alkali treatment of loofah: the loofah of pulverizing is pressed 50% of gross mass, is that 5% NaOH solution and 20% ethanol solution are mixed and immersed in azeotropic 0.5 h with concentration, constantly adds NaOH solution and during azeotropy Ethanol mixed solution, to maintain the volume of the solution, the loofah is completely soaked, washed with deionized water until the pH is 7 after cooling, dried at 60°C after suction filtration, to obtain alkalized loofah.

[0032](3) Preparation of melamine molecularly imprinted adsorption material on the surface of loofah: weigh 3g alkalized loofah, 0.2g melamine: 20mL ethanol-water (volume ratio 4:1), 2.0mL methacrylic acid, 10mL ethylene glycol dimethyl Acrylic ester, 0.2g azobisisobutyr...

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Abstract

The invention discloses a preparation method of a loofah sponge surface melamine molecule imprinting adsorbing material and application of melamine in detecting food. In the method, natural loofah sponge which belongs to natural high molecular material is used as a support body, and melamine molecule imprinting polymers are modified on the surface of the support body. The preparation method comprises the following steps of: adding alkalized loofah sponge, melamine, methacrylic acid, ethylene glycol dimethacrylate and azodiisobutyronitrile in a certain proportion; removing oxygen with argon inan alcohol medium; reacting for 20-30 hours in a constant temperature water bath at 55-65 DEG C, filtering and washing; carrying out Soxhlet extraction for 18-30 hours with a 10-15 percent (by volumefraction) acetic acid-methanol solution to remove template melamine molecules; and washing and drying to obtain the adsorbing material. The adsorbing material has the advantages of specific identification ability to the melamine, high selectivity, high adsorbing speed, good desorption property, biodegradation, regeneration capacity, and the like, and the maximum adsorption capacity is 126mg / g.

Description

technical field [0001] The invention relates to a preparation method and application technology of a molecularly imprinted adsorption material, in particular to a preparation method of a melamine molecularly imprinted adsorption material and its application technology in food testing. Background technique [0002] Melamine, referred to as triamine for short, is a triazine heterocyclic organic compound and an important organic chemical raw material. It is widely used in the synthesis of resins, wood processing, coatings, papermaking, textiles, medicine and other industries. The incident of melamine-contaminated milk powder in China causing baby kidney stones and several incidents of pets being killed by feed in the United States made the detection of melamine a hot spot. At present, chromatographic methods are usually used to detect melamine residues in food and feed at home and abroad. Because the matrix of food and feed is relatively complex, it brings difficulties to chro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30G01N21/64G01N21/17
Inventor 李慧芝许崇娟张瑾解文秀
Owner UNIV OF JINAN
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