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Process method for extracting theine from teas

A process method and caffeine technology, which are applied in the field of extracting caffeine, can solve the problems of cumbersome resin adsorption process, low yield of ion precipitation method, and difficulty in large-scale production, and achieve the goals of shortening extraction time, good solubility, and increasing extraction rate Effect

Inactive Publication Date: 2013-02-13
GUANGZHOU RZN BIOTECH CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods have disadvantages in different degrees: for example, the product of the solvent extraction method may have the possibility of organic solvent residue; the ion precipitation method not only has a low yield, but also uses metal salts to precipitate and separate tea polyphenols, and the metal salts will be released in the product. There are different degrees of residue; the resin adsorption method is cumbersome and difficult to produce on a large scale
[0004] Chinese invention patent application 201010119441.5 discloses a production process of decaffeinated tea, which uses supercritical CO 2 Extraction, although there is no need to add chemical solvents, nor does it need to use activated carbon adsorption, but the extraction time of this method is relatively long and the process is cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of process step and process condition of extracting caffeine from tealeaves are as follows:

[0029] Step 1: Microwave pretreatment

[0030] Put 250 grams of tea into the microwave oven, microwave for 30 seconds at intervals of 1 minute and then reheat for 30 seconds, intermittent heating to 45°C;

[0031] Step 2: Ultrasound and supercritical CO 2 extraction

[0032] Firstly, the tea leaves that have been pretreated by microwave and kept their original shape are added with entrainer water at a solid-to-liquid ratio of 1:0.05, and placed in supercritical CO 2 in the extraction kettle, and then turn on the CO 2 The high-pressure pump injects high-pressure CO into the extraction kettle at a flow rate of 3L / h 2 At the same time, open the entrainer pump and inject 25 grams of entrainer water with a solid-to-liquid ratio of 1:0.1 into the extraction kettle; the ultrasonic generator and CO 2 High pressure pumps work simultaneously to intensify the supercritical CO ...

Embodiment 2

[0036] Step 1: Microwave pretreatment

[0037] Put 250 grams of tea into the microwave oven, microwave for 30 seconds at intervals of 1 minute and then reheat for 30 seconds, intermittent heating to 45°C;

[0038] Step 2: Ultrasonic enhanced supercritical CO 2 extraction

[0039] Firstly, the tea leaves that have been pretreated by microwave and kept their original shape are added with entraining agent 30% ethanol at a solid-to-liquid ratio of 1:0.01, and placed in supercritical CO 2 in the extraction kettle, and then turn on the CO 2 The high-pressure pump injects high-pressure CO into the extraction kettle at a flow rate of 8L / h 2 At the same time, open the entrainer pump and inject the entrainer with a solid-liquid ratio of 1:0.5, namely 30% ethanol, into the extraction kettle; the ultrasonic generator and CO 2 High pressure pumps work simultaneously to intensify the supercritical CO 2 extraction;

[0040] Step 3: Parsing

[0041] When the pressure in the extraction ...

Embodiment 3

[0043]A kind of process step and process condition of extracting caffeine from tealeaves are as follows:

[0044] Step 1: Microwave pretreatment

[0045] Put 250 grams of tea into the microwave oven, microwave for 30 seconds at intervals of 1 minute and then reheat for 30 seconds, intermittent heating to 45°C;

[0046] Step 2: Ultrasonic enhanced supercritical CO 2 extraction

[0047] First, after microwave pretreatment, crush to 40 mesh, add entrainer water according to the solid-to-liquid ratio of 1:0.01, and place it in supercritical CO 2 in the extraction kettle, and then turn on the CO 2 The high-pressure pump injects high-pressure CO into the extraction kettle at a flow rate of 5L / h 2 At the same time, open the entrainer pump and inject 150 grams of entrainer water with a solid-to-liquid ratio of 1:0.6 into the extraction kettle; the ultrasonic generator and CO 2 High pressure pumps work simultaneously to intensify the supercritical CO 2 of extraction.

[0048] St...

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Abstract

The invention discloses a process method for extracting theine from teas. The process method comprises the steps of firstly performing pretreatment by microwave, heating the teas to be not higher than the lower limit of the extraction temperature of supercritical CO2, and extracting by combining ultrasound and supercritical CO2 to obtain the natural theine, wherein the extraction pressure is 20-28MPa, the temperature is 45-65 DEG C, and the desorption temperature is 40-55 DEG C. The process method provided by the invention effectively strengthens the process for extracting theine and improves the extraction rate to 85-95%; when the process method is applied, the non-crushed teas not only remain the original shape but also retain the flavor of the teas, and especially retain over 90% of polyphenol compound after the extraction of theine, so that the teas still can meet the needs of special consumers. The process method provided by the invention has the advantages of high safety and efficiency, low cost, simple process, convenience in operation, and easiness of scale production.

Description

[0001] The patent application of the present invention is a divisional application with the application number "201010242228.3". Process method of caffeine and tea polyphenol mixture". technical field [0002] The invention relates to a method for extracting caffeine, in particular to a process for extracting caffeine from tea leaves. technical background [0003] The traditional method of extracting caffeine from tea leaves is to first obtain a mixed extract containing caffeine and tea polyphenols by soaking or steaming, and then extract the mixed extract by different methods to obtain tea polyphenols and caffeine respectively. At present, the prior art can be classified into three categories according to different extraction methods: solvent extraction method, ion precipitation method and resin adsorption method. However, the above-mentioned methods have disadvantages in different degrees: for example, the product of the solvent extraction method may have the possibility ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D473/12
CPCY02P20/54
Inventor 张海
Owner GUANGZHOU RZN BIOTECH CO LTD
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