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Preparation method of urethane molecularly imprinted polymer

A technology of urethane and molecular imprinting, which is applied in the field of preparation of bio-based molecular imprinting materials, can solve problems such as removal and separation that are difficult to achieve, and achieve the effect of reducing content

Inactive Publication Date: 2012-10-17
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

However, the content of urethane substances in food is very small (microgram level), and these methods are difficult to achieve the purpose of removal and separation

Method used

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  • Preparation method of urethane molecularly imprinted polymer
  • Preparation method of urethane molecularly imprinted polymer
  • Preparation method of urethane molecularly imprinted polymer

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Embodiment

[0017] (1) Synthesis of dimethyl-4-aminophenyl-dioxane: take by weighing 100g p-nitrobenzaldehyde, 75g dimethylpropanediol, 11.4g p-toluenesulfonic acid and join in 285g toluene and heat to reflux (with fraction water device), until no water is produced, and the reaction finishes cooling. with saturated NaHCO 3 , water, washing and filtering to obtain 115g white crystals, then weigh 53g stannous chloride and mix and dissolve in 200g of 1.2% by mass HCl solution, react for 3h, filter and dry to obtain dimethyl-4-aminophenyl-dioxin alkyl.

[0018] The synthetic chemical equation of dimethyl-4-aminophenyl-dioxane:

[0019]

[0020] (2) Cyclodextrin pretreatment: Weigh 100 g of β-cyclodextrin and dissolve it in 320 g of pyridine, stir until completely dissolved, weigh 66.7 g of p-toluenesulfonyl chloride and dissolve it in 100 g of pyridine. Add the solution of p-toluenesulfonyl chloride dropwise to the pyridine solution of β-cyclodextrin placed in a water bath at 5°C, react...

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Abstract

The invention discloses a preparation method of urethane molecularly imprinted polymer, which comprises the following five steps: 1. synthesis of dimethyl-4-aminophenyl-dioxane; 2. pretreatment of cyclodextrin; 3. preparation of cyclodextrin containing aldehyde group; 4. crosslinking polymerization of Schiff base compound; and 5. elution of urethane template for obtaining the molecularly imprinted polymer. In the method, beta-cyclodextrin molecules are utilized for performing graft modification to functional groups with exclusive recognition activity and used as molecularly imprinting material substance; the urethane pollutant is taken as the template; through the above steps, specific functional material for exclusively adsorbing the urethane pollutants is obtained. The prepared urethane molecularly imprinted polymer has the advantages of good biocompatibility and incapability of secondary pollution. As the used ligand is compatible with organism, the urethane molecularly imprinted polymer has high-effective and exclusive recognition effect which is same as that of an organism recognition system, and can be used for recognition in water phase at high efficiency.

Description

technical field [0001] The invention relates to a preparation method of a bio-based molecular imprinting material, in particular to a preparation method of a molecular imprinting polymer capable of specifically recognizing urethane pollutants. Background technique [0002] Research on urethane compounds began as early as the middle of the 20th century. Research on urethane at home and abroad is mainly devoted to the detection of urethane content in food, such as chromatography / mass spectrometry (GC / MS) method, solid microextraction + GC / MS method, two-dimensional or multidimensional chromatography-stable isotope Dilution mass spectrometry, etc. Currently analyzing and detecting the content of ethyl carbamate, establishing the determination method and limit standard of the content of ethyl carbamate in food (alcoholic beverages), further conducting in-depth research on the formation mechanism of ethyl carbamate and preventing and reducing the formation of ethyl carbamate At...

Claims

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Application Information

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IPC IPC(8): C08B37/16C08J9/26
Inventor 郭明殷欣欣王春鹏
Owner ZHEJIANG FORESTRY UNIVERSITY
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