Porous dodecahedral ZnO and application thereof as lecithin adsorption material

A technology of regular dodecahedron and adsorption material is applied to porous regular dodecahedron ZnO and its application field as a lecithin adsorption material, which can solve the problem of low adsorption efficiency and achieve the effect of improving test efficiency.

Active Publication Date: 2018-01-30
GUANGZHOU QUALITY SUPERVISION & TESTING INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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However, limited by its particle si...

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  • Porous dodecahedral ZnO and application thereof as lecithin adsorption material
  • Porous dodecahedral ZnO and application thereof as lecithin adsorption material
  • Porous dodecahedral ZnO and application thereof as lecithin adsorption material

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Embodiment 1

[0039] A kind of porous regular dodecahedral ZnO, preparation method comprises the following steps:

[0040] (1) Weigh 6.6g of dimethylimidazole, 3g of Zn(NO 3 ) 2 ·6H 2 O, respectively added to 140mL of methanol solution, stirred sufficiently to obtain dimethylimidazole solution and zinc nitrate solution, poured the dimethylimidazole solution into the solution of zinc nitrate, stirred at room temperature for 24h, centrifuged to obtain a solid, and then Wash three times with methanol solution, put it into a constant temperature drying oven, and dry overnight at 80°C. The resulting product is the precursor.

[0041] To characterize the precursors, as figure 1 , 2 Shown are the XRD patterns and SEM patterns of the precursors. figure 1 In , the abscissa is twice the incident angle of X-rays, and the ordinate is the intensity after diffraction. figure 1 Confirmed the existence of ZIF-8 precursor; figure 2 Among them, the ZIF-8 precursor has a polyhedral granular structure ...

Embodiment 2

[0064] In samples containing lecithin, since lecithin is difficult to remove from the sample, when the sample is tested for other components by UPLC, the presence of lecithin will affect the accuracy of the test results to a certain extent. The present embodiment provides a kind of UPLC detection method that contains lecithin serum sample, comprises the following steps:

[0065] Pretreatment of the serum sample containing lecithin: put the above-mentioned lecithin adsorption material into the serum sample containing lecithin, and stir for 24 hours.

[0066] Serum samples after adsorption were routinely detected by UPLC.

[0067] In this example, before using UPLC to analyze and measure the serum sample containing lecithin, the above-mentioned lecithin adsorption material was placed in the serum sample containing lecithin and stirred for 24 hours to remove lecithin from the sample and improve the efficiency of testing other components.

Embodiment 3

[0069] This embodiment provides a method for applying the above-mentioned lecithin adsorption material to the extraction of egg yolk lecithin, the steps are as follows:

[0070] Adsorption: The above-mentioned adsorption materials are used to enrich egg yolk lecithin. Put the above-mentioned lecithin adsorption material in the egg yolk lecithin extract, adjust the pH to ≤7, and stir for 24 hours.

[0071] Analysis: routine analysis is performed on the lecithin adsorption material enriched with lecithin to obtain egg yolk lecithin with high purity.

[0072] The method firstly absorbs the egg yolk lecithin, and then analyzes the solid precipitation to obtain the egg yolk lecithin with higher purity, which provides a new idea for the extraction of the lecithin.

[0073] The principle is as follows: ZnO can behave as a Lewis acid or a Lewis base at different pH values. Under acidic conditions, zinc atoms are positively charged as a Lewis acid, which can combine with anions, whil...

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Abstract

The invention relates to porous dodecahedral ZnO and application thereof as a lecithin adsorption material. The porous dodecahedral ZnO can be used as the lecithin adsorption material for selectivelyadsorbing and enriching lecithin by characteristic Lewis acid-base reaction in combination with the advantages of a nanomaterial and a metal-organic framework material, and the adsorption efficiency can reach 80 percent.

Description

technical field [0001] The invention relates to the field of food and materials, in particular to a porous regular dodecahedron ZnO and its application as a lecithin adsorption material. Background technique [0002] Phosphatidylcholine (PC) is the most abundant phospholipid that makes up the cell membrane, and it is also called lecithin because of its high content in egg yolk. Lecithin has high nutritional value. However, because the structure contains a lot of unsaturated fatty acids, it is easy to oxidize and absorb moisture. Due to technical limitations, it is difficult to separate and extract from egg yolk and other biological samples. [0003] Because lecithin is difficult to separate from egg yolk, there is less development and utilization of egg yolk lecithin in the market; because lecithin is difficult to remove from other biological samples, when UPLC detects and analyzes biological samples containing lecithin, lecithin The presence of phospholipids can affect t...

Claims

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Application Information

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IPC IPC(8): C01G9/02C01G9/03B01J20/06G01N30/02
Inventor 冼燕萍梁明王斌吴玉銮王莉赵晓娟侯向昶吴益阳陈嘉慧
Owner GUANGZHOU QUALITY SUPERVISION & TESTING INST
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