Preparation process for tea polyphenol metal complex

A metal complex and preparation technology, applied in the direction of calcium organic compounds, zinc organic compounds, etc., can solve the problems of easy oxidation of tea polyphenols, large solvent consumption, agglomeration, etc., and achieve the effect of no three wastes and fewer process steps

Active Publication Date: 2012-06-20
HENAN UNIVERSITY
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Problems solved by technology

[0003] In China, there are reports of tea polyphenol metal complexes prepared from tea polyphenols as raw materials, such as tea polyphenol zinc, tea polyphenol calcium, tea polyphenol silver, and nano-tea polyphenol lanthanum. These complexes are based on relatively pure Tea polyphenols and soluble metal salts are synthesized in aqueous solution as raw materials, and there are the following disadvantages: the extraction process of tea polyphenols is complicated, the consumption of solvent is large, and tea polyphenols are easily oxidized and agglomerated during the synthesis process

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  • Preparation process for tea polyphenol metal complex
  • Preparation process for tea polyphenol metal complex
  • Preparation process for tea polyphenol metal complex

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Embodiment 1

[0029] Preparation process of tea polyphenol zinc complexes: take 5.0 g of Xinyang tea leaves, extract 3 times with 100 g of distilled water in a water bath at 70°C, filter the tea soup, combine the tea soup, and add 3.0 g of ZnSO 4 ·7H 2 O, after magnetic stirring and dissolving, add 1 mol / L Na dropwise while stirring 2 CO 3 The pH of the solution was adjusted to 5, the reaction was stopped for 30 minutes, the stirring was stopped, and the filter cake was washed with water, ethanol and acetone in sequence, and the filter cake was vacuum-dried to obtain 0.65 g of brown-yellow tea polyphenol zinc complex.

[0030] Using gallic acid as the reference substance, the mass content of tea polyphenols in the tea polyphenol zinc complex was determined by ferrous tartrate spectrophotometry to be 22.80%; the mass content of zinc was determined to be 14.43% by EDTA complexometric titration.

[0031] Infrared spectrum of tea polyphenols figure 1 As shown, the obtained tea polyphenol zin...

Embodiment 2

[0036] Preparation process of tea polyphenol zinc complexes: take 5.0 g of Xinyang tea leaves, extract 3 times with 50 g of distilled water in a 75°C water bath, and filter to obtain tea soup, combine the tea soup, add 0.5 g of zinc chloride to the tea soup, and magnetically stir to dissolve Add 1 mol / L NaHCO dropwise while stirring 3 Adjust the pH of the solution to 5.5, stop stirring after 40 minutes of reaction, filter with suction, wash the filter cake with water, ethanol, and acetone in sequence, and vacuum-dry the filter cake to obtain 0.58 g of brown-yellow tea polyphenol zinc complex.

[0037] Using gallic acid as the reference substance, the mass content of tea polyphenols in the tea polyphenol-zinc complex was determined by ferrous tartrate spectrophotometry to be 14.60%; the mass content of zinc was determined to be 9.26% by EDTA complexometric titration.

[0038] The infrared spectrogram of the tea polyphenol zinc complex that makes is as follows Figure 5 shown. ...

Embodiment 3

[0040] Preparation process of tea polyphenol zinc complex, take 5.0 g of Xinyang tea leaves, extract 3 times with 70 g of distilled water in a water bath at 80°C, filter the tea soup, combine the tea soup, add 3.0 g of zinc acetate to the tea soup, and magnetically stir to dissolve it. Add 1 mol / L KHCO dropwise while stirring 3 Adjust the pH of the solution to 6, stop stirring after 50 minutes of reaction, filter with suction, wash the filter cake with water, ethanol, and acetone in sequence, and vacuum-dry the filter cake to obtain 0.63 g of brown-yellow tea polyphenol zinc complex.

[0041] Using gallic acid as the reference substance, the mass content of tea polyphenols in the tea polyphenol-zinc complex was determined by ferrous tartrate spectrophotometry to be 24.58%; the mass content of zinc was determined to be 16.77% by EDTA complexometric titration.

[0042] The infrared spectrogram of the tea polyphenol zinc complex that makes is as follows Figure 6 shown.

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Abstract

The invention belongs to the field of tea polyphenol metal complexes, and specifically to a preparation process for a tea polyphenol metal complex. The preparation process comprises the following steps: adopting distilled water to carry out water bath lixiviate on tea leaves, and carrying out sucking filtration to obtain a tea infusion; adding a water-soluble metal salt to the tea infusion, stirring to dissolve, and adding an alkali solution in a dropwise manner to adjust the pH value to 5-8; stopping the stirring after carrying out the reaction for 0.5-1 hours; carrying out sucking filtration, and washing the filter cake sequentially by using water, ethanol and acetone; carrying out vacuum drying on the washed filter cake to obtain the tea polyphenol metal complex. The preparation process of the present invention has the following advantages that: the raw materials are easy to obtain, no special requirement on the quality of the tea leaf is required, the waste tea leaf can be adopted, the process steps are less, and the three waste is not generated.

Description

technical field [0001] The invention belongs to the field of tea polyphenol metal complexes, in particular to a preparation process of tea polyphenol metal complexes. Background technique [0002] Tea polyphenols is the general term for phenols and their derivatives in tea. The main components are flavanols, anthocyanins, flavonols and flavonoids. The flavanols are mainly catechins. The four kinds of catechins are Epigallocatechin gallate (Epigallocatechin gallate, EGCG), epicatechin gallate (Epicabechingallate, ECG), epicatechin (Epicatechin, EC) and epigallocatechin ( Epigallocatechin, EGC). There are many ortho phenolic hydroxyl groups in the molecule of tea polyphenols, which can be used as multi-base ligands to complex with a central ion such as lead, zinc, iron, calcium, etc. to form a ring-shaped chelate. The new theory of effective chemical components of traditional Chinese medicine believes that the active components in traditional Chinese medicine may be one or s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F3/06C07F3/04
Inventor 刘绣华李明静赵东保王彦兵杨静呼亚旭
Owner HENAN UNIVERSITY
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