Method used for preparing tea polyphenol adsorption material via cellulose modification

An adsorption material, cellulose technology, applied in the direction of selective adsorption, chemical instruments and methods, ion exchange, etc., can solve the problems of inability to separate tea polyphenols, and achieve the effects of fast adsorption rate, high adsorption selectivity, and low energy consumption

Active Publication Date: 2017-11-07
QILU UNIV OF TECH
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Problems solved by technology

Therefore, using it as the initial raw material for the preparation of adsorbents can overcome the defect that the fragments of artificially synthesized adsorbents are easy to fall off, although lignin is also a natural renewable resource, and its content in plants is relatively high, and the application number 201110237877.9 has published A method for lignin modification and adsorption of tea polyphenols, but the adsorption mechanism is mainly because tea polyphenols contain many hydroxyl groups, which have the possibility of forming hydrogen bonds with affinity groups in lignin. At the same time, the lignin The benzene ring structure may also form π-π stacking with the benzene ring structure of catechins, resulting in adsorption, but because tea also contains substances with a large number of hydroxyl groups such as amino acids, proteins, vitamins, etc., these substances can be combined with wood A large number of hydrogen bonds are generated between the hydroxyl groups in polyphenols, so it is impossible to effectively separate tea polyphenols from these substances

Method used

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  • Method used for preparing tea polyphenol adsorption material via cellulose modification
  • Method used for preparing tea polyphenol adsorption material via cellulose modification
  • Method used for preparing tea polyphenol adsorption material via cellulose modification

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preparation example Construction

[0039] In the preparation process of the phenylboronic acid modified cellulose, the reaction time is 2-24 hours, the reaction temperature is 40°C-85°C, and the stirring rate is 200-400r / min.

[0040] The reaction mechanism of phenylboronic acid and tea polyphenols is:

[0041]

[0042] The test method for the adsorption performance of modified cellulose to tea polyphenols is to use the cellulose before and after modification as the adsorbent, and the tea polyphenols as the adsorbate, place it in a conical flask, and adjust the gap between the cellulose and the adsorbate. ratio, and adjust the pH of the adsorbate to 9-10, place it in an oscillator to oscillate for adsorption, control a certain oscillation frequency and oscillation time (that is, the adsorption time), take the solution after adsorption, and dilute the concentration to the detection range of the instrument Inside, the concentration of each substance in the adsorbate before and after adsorption was detected by ...

Embodiment 1

[0046] Add 10g of eucalyptus cellulose into 1000mL of distilled water, stir and disperse for 12h under the action of mechanical stirring at 200r / min, then dissolve 0.1g of initiator cerium ammonium nitrate and 2g of 4-vinylphenylboronic acid in 10mL of distilled water, and slowly add to the reaction The device was protected by nitrogen, and the reaction temperature was controlled at 40°C. After 24 hours of reaction, phenylboronic acid modified cellulose was obtained. After the cellulose was extracted with distilled water and ethanol for 24 hours, it was dried in vacuum at 45°C for 24 hours, and the final product was obtained. Tea polyphenols adsorption material prepared by cellulose modification.

Embodiment 2

[0048] Add 80g of bamboo cellulose to 1000mL of distilled water, stir and disperse for 12h under the action of mechanical stirring at 400r / min, then dissolve 1.5g of initiator ammonium persulfate and 20g of 4-vinylphenylboronic acid in 10mL of distilled water, and slowly add to the reaction device , nitrogen protection, control the reaction temperature at 85°C, after 2 hours of reaction, phenylboronic acid modified cellulose was obtained, the cellulose was extracted with distilled water and ethanol for 24 hours, and then vacuum dried at 45°C for 24 hours to obtain the final product, fiber Tea polyphenols adsorption material prepared by element modification.

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Abstract

The invention provides a method used for preparing a tea polyphenol adsorption material via cellulose modification, and belongs to the technical field of high molecular modification. According to the method, natural cellulose is taken as an initial raw material, free radicals induced graft copolymerization is adopted so as to realize grafting of vinylphenylboronic acid onto cellulose molecular chains, and cellulose is modified and provided with adsorption and desorption performance on tea polyphenol based on mechanisms that a boric acid ester can be produced via reaction of phenyl boric acid with the o-dihydroxybenzene structure in tea polyphenol, and dissociation of the boric acid ester is induced at acid conditions. The adsorption capacity of the tea polyphenol adsorption material is mainly composed of chemisorption capacity, selectivity is high, and separation purity is high.

Description

technical field [0001] The invention relates to the technical field of polymer modification, in particular to a method for preparing a tea polyphenol adsorption material by modifying cellulose. Background technique [0002] Tea Polyphenols (Tea Polyphenols) is the general term for phenolic substances and derivatives in tea. The main component is catechin, which accounts for 60% to 80% of the main components in tea. Its chemical structure: [0003] [0004] It has a strong hydrogen supply capacity and generates o-quinones and biphenol quinones during the oxidation process. It is an ideal natural antioxidant, and its antioxidant activity is higher than that of general non-phenolic or monophenolic hydroxyl antioxidants. Therefore, extracting tea polyphenols from low-grade tea can increase the value of low-value tea, and will become a new industry that can bring huge economic benefits to society. [0005] At present, extraction, centrifugation, concentration, activated carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30B01D15/08
CPCB01D15/08B01J20/22B01J20/24B01J2220/4825
Inventor 孔凡功夏南南吴芹王守娟刘忠明傅成龙
Owner QILU UNIV OF TECH
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