CN115553359A - Preparation process of decaffeinated tea - Google Patents
Preparation process of decaffeinated tea Download PDFInfo
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- CN115553359A CN115553359A CN202211262439.2A CN202211262439A CN115553359A CN 115553359 A CN115553359 A CN 115553359A CN 202211262439 A CN202211262439 A CN 202211262439A CN 115553359 A CN115553359 A CN 115553359A
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/36—Reducing or removing alkaloid content; Preparations produced thereby; Extracts or infusions thereof
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/06—Treating tea before extraction; Preparations produced thereby
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Abstract
The invention discloses a preparation process of decaffeinated tea, which comprises the following steps: mixing materials: adding purified water into tea leaves, stirring uniformly, moistening for 1 hour; adsorption: dehydrating the moistened tea leaves, adding an adsorbent into the dehydrated tea leaves, wherein the adsorbent is D72 resin, activated carbon, diatomite and activated clay, and standing after uniformly stirring; and (3) filtering: separating residue and liquid by using a drum screen, introducing purified water into the drum for multiple times in the process of separating residue and leaves by using the drum, feeding the separated tea leaves into a residue drying machine, and feeding the obtained filtrate into the next process; and (3) drying: heating and drying the tea leaves until the water content is less than or equal to 10 percent, and entering the next working procedure; packaging: quantitatively packaging the dried powder; warehousing: warehousing the product for sale; the tea prepared by the invention has the caffeine content lower than 0.1g/100g and the tea polyphenol content higher than 23g/100g, and does not influence the taste and flavor of the tea.
Description
Technical Field
The invention belongs to the technical field of tea processing, and particularly relates to a preparation process of decaffeinated tea.
Background
Caffeine of the formula C 8 H 10 N 4 O 2 The xanthine alkaloid compound is a xanthine alkaloid compound, is a central nerve stimulant, can temporarily drive drowsiness and restore energy, and is clinically used for coma resuscitation. Coffee, tea, soft drinks and energy drinks with caffeine content are well marketed and therefore caffeine is also the most commonly used psychotropic drug in the world.
In north america, 90% of adults use caffeine daily. Many natural sources of caffeine also contain a variety of other xanthine alkaloids, including the cardiotonic theophylline and theobromine, as well as other substances such as tannins.
Caffeine is a plant alkaloid that can be found in many plants. As a natural insecticide, it paralyzes insects which swallow caffeine-containing plants. The caffeine-containing plants most commonly used by humans include coffee, tea and some cocoa. Other infrequent uses include ilex paraguariensis and guarana, which are commonly used to make tea or energy drinks. Two alias names for caffeine: yerba mate and guarana factors have evolved from these two plants.
The world's leading source of caffeine is coffee beans (seeds of the coffee tree), which are also the raw material of coffee. The caffeine content in coffee depends to a great extent on the variety of coffee beans and the method of making the coffee, and even on the same tree, the caffeine content in coffee beans is very different. Typically, the caffeine content of a cup of coffee ranges from 40 mg in espresso coffee to 100 mg in espresso coffee. Dark roasted coffee generally has less caffeine content than light roasted coffee because roasting reduces the caffeine content of the coffee beans. The caffeine content of arabian coffee is generally lower than that of medium-sized coffee. Coffee also contains traces of theophylline but no theobromine.
Tea is another important source of caffeine, and the caffeine content of each cup of tea is generally only half that of each cup of coffee, depending on the strength of the tea. Certain varieties of tea, such as black tea and oolong tea, have higher caffeine levels than other teas. Tea contains a small amount of theobromine and slightly more theophylline than coffee. Tea making has a great effect on tea, but the color of tea hardly indicates the caffeine content. The caffeine content in the tea leaves ensures that the tea soup tastes bitter and astringent, and after the tea soup is eaten, a human body is easy to cause excessive excitation of spirit and is difficult to fall asleep.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a preparation process of decaffeinated tea, which removes caffeine in tea leaves and can keep the flavor and taste of the tea leaves to the maximum extent.
The purpose of the invention is realized by the following technical scheme: a preparation process of decaffeinated tea comprises the following steps:
s1, stirring materials: adding purified water into tea leaves, stirring uniformly, moistening for 1 hour;
s2, adsorption: dehydrating the moistened tea leaves, adding an adsorbent into the dehydrated tea leaves, wherein the adsorbent is D72 resin, activated carbon, diatomite and activated clay, and standing after uniformly stirring;
s3, filtering: separating residue and liquid by using a drum screen, introducing purified water into the drum for multiple times in the process of separating residue and leaves by using the drum, feeding the separated tea leaves into a residue drying machine, and feeding the obtained filtrate into the next process;
s4, drying: heating and drying the tea leaves until the water content is less than or equal to 10 percent, and entering the next working procedure;
s5, packaging: quantitatively packaging the dried powder;
s6, warehousing: and warehousing the product for sale.
Further, the amount of the purified water added in the step S1 is 1.5 times of the dry weight of the tea leaves.
Further, the addition amount of the adsorbent is 0.4 time of the weight of the dehydrated tea leaves.
Further, the mass ratio of the D72 resin, the activated carbon, the diatomite and the activated clay in the adsorbent is 0.5.
Further, in the step S2, the adsorption temperature is 33 ℃, and the adsorption pressure is normal pressure.
Further, in the step S2, the stirring time is 10min, and the standing time is 10min.
Further, in the step S3, purified water is introduced into the roller for 3 times, wherein the temperature of the purified water introduced for the first time is 75-80 ℃, the temperature of the purified water introduced for the second time is 50-70 ℃, and the temperature of the purified water introduced for the third time is 20-25 ℃.
Further, the temperature rise drying in the step S4 is programmed temperature rise; the heating rate is 6-8 ℃/min, and the temperature is increased to 95-105 ℃.
The invention has the beneficial effects that:
(1) The invention firstly moistens the tea leaves to activate the tea leaves, and then carries out adsorption treatment through the adsorbent to remove the caffeine in the activated tea leaves. In the removing process, the D72 resin adsorbs hydrogen bonds in caffeine, so that the D72 resin has extremely high selectivity, meanwhile, the acidic functional group of the activated carbon adsorbs which base group the caffeine is, the basic functional group on the activated carbon adsorbs carboxyl of the caffeine, and the chemical adsorption is combined with the porous structures of the activated carbon, the activated clay and the diatomite to carry out physical adsorption, so that the caffeine in the tea leaves is removed at high selectivity to the utmost extent, and flavor substances in the tea leaves are not influenced.
(2) On the premise that the adsorbent removes a large amount of caffeine, the adsorbent is removed by using a roller, and in the process of removing the adsorbent, the caffeine remained in the tea leaves is removed by using purified water with a certain temperature, so that the content of the caffeine in the tea leaves is lower than 0.1g/100g, but the content of tea polyphenol is higher than 23g/100g.
(3) The tea prepared by the method has high caffeine content, high main component retention rate and basically unaffected flavor and taste, so that the tea soup soaked by the tea disclosed by the invention is soft, sweet and mellow in taste and low in preparation cost.
Drawings
FIG. 1 is a detection map of black tea prepared by the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
Example 1
A preparation process of decaffeinated tea comprises the following steps:
s1, stirring materials: adding purified water into tea leaves, stirring uniformly, moistening for 1 hour; the addition amount of the purified water is 1.5 times of the dry weight of the tea leaves;
s2, adsorption: dehydrating the moistened tea, adding adsorbent into the dehydrated tea at 33 deg.C under normal pressure, stirring for 10min, and standing for 10min; the addition amount of the adsorbent is 0.4 time of the weight of the dehydrated tea; the mass ratio of the D72 resin to the activated carbon to the diatomite to the activated clay in the adsorbent is 0.5;
s3, filtering: separating residue and liquid by using a drum screen, introducing purified water into the drum for multiple times in the process of separating residue and leaves by using the drum, feeding the separated tea leaves into a residue drying machine, and feeding the obtained filtrate into the next process; introducing purified water into the roller for 3 times, wherein the temperature of the purified water introduced for the first time is 75 ℃, the temperature of the purified water introduced for the second time is 50 ℃, and the temperature of the purified water introduced for the third time is 20 ℃;
s4, drying: drying the tea leaves at the heating rate of 6 ℃/min, heating to 95 ℃, drying until the water content is less than or equal to 10 percent, and entering the next working procedure;
s5, packaging: quantitatively packaging the dried powder;
s6, warehousing: and warehousing the product for sale.
Example 2
A preparation process of decaffeinated tea comprises the following steps:
s1, stirring materials: adding purified water into tea leaves, stirring uniformly, moistening for 1 hour; the addition amount of the purified water is 1.5 times of the dry weight of the tea leaves;
s2, adsorption: dehydrating the moistened tea, adding adsorbent into the dehydrated tea at 33 deg.C under normal pressure, stirring for 10min, and standing for 10min; the addition amount of the adsorbent is 0.4 time of the weight of the dehydrated tea; the mass ratio of the D72 resin to the activated carbon to the diatomite to the activated clay in the adsorbent is 0.5;
s3, filtering: separating residue and liquid by using a drum screen, introducing purified water into the drum for multiple times in the process of separating residue and leaves by using the drum, feeding the separated tea leaves into a residue drying machine, and feeding the obtained filtrate into the next process; introducing purified water into the roller for 3 times, wherein the temperature of the purified water introduced for the first time is 78 ℃, the temperature of the purified water introduced for the second time is 63 ℃, and the temperature of the purified water introduced for the third time is 23 ℃;
s4, drying: drying the tea leaves at the temperature rise rate of 7 ℃/min, raising the temperature to 100 ℃, drying until the water content is less than or equal to 10 percent, and entering the next working procedure;
s5, packaging: quantitatively packaging the dried powder;
s6, warehousing: and warehousing the product for sale.
Example 3
A preparation process of decaffeinated tea comprises the following steps:
s1, stirring: adding purified water into tea leaves, stirring uniformly, moistening for 1 hour; the addition amount of the purified water is 1.5 times of the dry weight of the tea leaves;
s2, adsorption: dehydrating the moistened tea, adding adsorbent into the dehydrated tea at 33 deg.C under normal pressure, stirring for 10min, and standing for 10min; the addition amount of the adsorbent is 0.4 time of the weight of the dehydrated tea; the mass ratio of the D72 resin to the activated carbon to the diatomite to the activated clay in the adsorbent is 0.5;
s3, filtering: separating residue and liquid by using a drum screen, introducing purified water into the drum for multiple times in the process of separating residue and leaves by using the drum, feeding the separated tea leaves into a residue drying machine, and feeding the obtained filtrate into the next process; introducing purified water into the roller for 3 times, wherein the temperature of the purified water introduced for the first time is 80 ℃, the temperature of the purified water introduced for the second time is 70 ℃, and the temperature of the purified water introduced for the third time is 25 ℃;
s4, drying: drying the tea leaves at the temperature rise rate of 8 ℃/min, raising the temperature to 105 ℃, drying until the water content is less than or equal to 10 percent, and entering the next working procedure;
s5, packaging: quantitatively packaging the dried powder;
s6, warehousing: and warehousing the product for sale.
Comparative example 1
A preparation process of decaffeinated tea comprises the following steps:
s1, stirring materials: adding purified water into the tea leaves, uniformly stirring, moistening for 0.5 hour; the addition amount of the purified water is 1.5 times of the dry weight of the tea leaves;
s2, adsorption: dehydrating the moistened tea leaves, adding an adsorbent into the dehydrated tea leaves at 33 ℃ and normal pressure, wherein the adsorbent is D72 resin, stirring for 10min, and standing for 10min; the addition amount of the adsorbent is 0.4 time of the weight of the dehydrated tea;
s3, filtering: separating residue and liquid by using a drum screen, introducing purified water into the drum for multiple times in the process of separating residue and leaves by using the drum, feeding the separated tea leaves into a residue drying machine, and feeding the obtained filtrate into the next process; introducing purified water into the roller for 3 times, wherein the temperature of the purified water introduced for the first time is 78 ℃, the temperature of the purified water introduced for the second time is 600 ℃, and the temperature of the purified water introduced for the third time is 20 ℃;
s4, drying: drying the tea leaves at the heating rate of 7 ℃/min, heating to 105 ℃, drying until the water content is less than or equal to 10 percent, and entering the next working procedure;
s5, packaging: quantitatively packaging the dried powder;
s6, warehousing: and warehousing the product for sale.
Comparative example 2
A preparation process of decaffeinated tea comprises the following steps:
s1, stirring materials: adding purified water into tea leaves, stirring uniformly, moistening for 1 hour; the addition amount of the purified water is 1.5 times of the dry weight of the tea leaves;
s2, adsorption: dehydrating the moistened tea, adding adsorbent into the dehydrated tea at 33 deg.C under normal pressure, stirring for 10min, and standing for 10min; the addition amount of the adsorbent is 0.4 time of the weight of the dehydrated tea; the mass ratio of the activated carbon to the diatomite to the activated clay in the adsorbent is 1;
s3, filtering: separating residue and liquid by using a drum screen, introducing purified water into the drum for multiple times in the process of separating residue and leaves by using the drum, feeding the separated tea leaves into a residue drying machine, and feeding the obtained filtrate into the next process; introducing purified water into the roller for 3 times, wherein the temperature of the purified water introduced for the first time is 80 ℃, the temperature of the purified water introduced for the second time is 63 ℃, and the temperature of the purified water introduced for the third time is 20 ℃;
s4, drying: drying the tea leaves at the temperature rise rate of 8 ℃/min, raising the temperature to 95 ℃, drying until the water content is less than or equal to 10 percent, and entering the next working procedure;
s5, packaging: quantitatively packaging the dried powder;
s6, warehousing: and warehousing the product for sale.
Comparative example 3
A preparation process of decaffeinated tea comprises the following steps:
s1, stirring materials: adding purified water into tea leaves, stirring uniformly, moistening for 1 hour; the addition amount of the purified water is 1.5 times of the dry weight of the tea leaves;
s2, adsorption: dehydrating the moistened tea, adding adsorbent, which is diatomite and activated clay, into the dehydrated tea at 33 ℃ and normal pressure, stirring for 10min, and standing for 10min; the addition amount of the adsorbent is 0.4 time of the weight of the dehydrated tea; the mass ratio of the diatomite to the activated clay in the adsorbent is 1:1;
s3, filtering: separating residue and liquid by using a drum screen, introducing purified water into the drum for multiple times in the process of separating residue and leaves by using the drum, feeding the separated tea leaves into a residue drying machine, and feeding the obtained filtrate into the next process; introducing purified water into the roller for 3 times, wherein the temperature of the purified water introduced for the first time is 75 ℃, the temperature of the purified water introduced for the second time is 50 ℃, and the temperature of the purified water introduced for the third time is 20 ℃;
s4, drying: drying the tea leaves at the heating rate of 6 ℃/min, heating to 95 ℃, drying until the water content is less than or equal to 10 percent, and entering the next working procedure;
s5, packaging: quantitatively packaging the dried powder;
s6, warehousing: and warehousing the product for sale.
Comparative example 4
A preparation process of decaffeinated tea comprises the following steps:
s1, stirring materials: adding purified water into tea leaves, stirring uniformly, moistening for 1 hour; the addition amount of the purified water is 1.5 times of the dry weight of the tea leaves;
s2, adsorption: dehydrating the moistened tea leaves, adding an adsorbent into the dehydrated tea leaves at 33 ℃ and normal pressure, wherein the adsorbent is D72 resin, activated carbon, diatomite and activated clay, stirring for 10min, and standing for 10min; the addition amount of the adsorbent is 0.4 time of the weight of the dehydrated tea; the mass ratio of the D72 resin to the activated carbon to the diatomite to the activated clay in the adsorbent is 0.5;
s3, filtering: separating residue and liquid by using a drum screen, introducing purified water into the drum for multiple times in the process of separating residue and leaves by using the drum, feeding the separated tea leaves into a residue drying machine, and feeding the obtained filtrate into the next process; introducing purified water at normal temperature into the roller for 3 times for washing;
s4, drying: drying the tea leaves at the temperature rise rate of 8 ℃/min, raising the temperature to 105 ℃, drying until the water content is less than or equal to 10 percent, and entering the next working procedure;
s5, packaging: quantitatively packaging the dried powder;
s6, warehousing: and warehousing the product for sale.
Indexes such as caffeine and tea polyphenol in the tea leaves prepared in examples 1 to 3 and comparative examples 1 to 4 were examined, and the examination results are shown in table 1 below.
Table 1:
| caffeine content (g/100 g) | Tea polyphenols content (g/100 g) | |
| Example 1 | 0.10 | 23 |
| Example 2 | 0.07 | 26 |
| Example 3 | 0.06 | 27 |
| Comparative example 1 | 0.90 | 25 |
| Comparative example 2 | 0.70 | 26 |
| Comparative example 3 | 1.20 | 24 |
| Comparative example 4 | 0.53 | 29 |
[ Note ]: the detection standard is based on a detection method of the content of tea polyphenol and catechin in tea leaves of CBT 8313-2008, and the tea leaves in the examples are black tea prepared by the sauce.
As can be seen from the above table, the decaffeinated black tea prepared by the invention has the caffeine content lower than 0.1g/100g, the tea polyphenol content is higher and not lower than 23g/100g, and as can be seen from figure 1, the catechin content in the tea is higher and not lower than 16g/100g. The invention proves that the caffeine in the tea can be reduced, the content of tea polyphenol in the tea can be effectively ensured, and the retention amount of catechin in the tea polyphenol is also higher.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A preparation process of decaffeinated tea is characterized by comprising the following steps:
s1, stirring materials: adding purified water into tea leaves, stirring uniformly, moistening for 1 hour;
s2, adsorption: dehydrating the moistened tea leaves, adding an adsorbent into the dehydrated tea leaves, wherein the adsorbent is D72 resin, activated carbon, diatomite and activated clay, and standing after uniformly stirring;
s3, filtering: separating residue and liquid by using a drum screen, introducing purified water into the drum for multiple times in the process of separating residue and leaves by using the drum, feeding the separated tea leaves into a residue drying machine, and feeding the obtained filtrate into the next process;
s4, drying: heating and drying the tea leaves until the water content is less than or equal to 10 percent, and entering the next working procedure;
s5, packaging: quantitatively packaging the dried powder;
s6, warehousing: and warehousing the product for sale.
2. The process for preparing decaffeinated tea according to claim 1, wherein: the addition amount of the purified water in the step S1 is 1.5 times of the dry weight of the tea leaves.
3. The process for preparing decaffeinated tea according to claim 1, wherein: the addition amount of the adsorbent is 0.4 time of the weight of the dehydrated tea.
4. The process for preparing decaffeinated tea according to claim 3, wherein: the mass ratio of the D72 resin, the activated carbon, the diatomite and the activated clay in the adsorbent is 0.5.
5. The process for preparing decaffeinated tea according to claim 4, wherein: in the step S2, the adsorption temperature is 33 ℃, and the adsorption pressure is normal pressure.
6. The process for preparing decaffeinated tea according to claim 5, wherein: in the step S2, the stirring time is 10min, and the standing time is 10min.
7. The process for preparing decaffeinated tea according to claim 1, wherein: and S3, introducing purified water into the roller for 3 times, wherein the temperature of the purified water introduced for the first time is 75-80 ℃, the temperature of the purified water introduced for the second time is 50-70 ℃, and the temperature of the purified water introduced for the third time is 20-25 ℃.
8. The process for preparing decaffeinated tea according to claim 1, wherein: step S4, heating and drying are programmed heating; the heating rate is 6-8 ℃/min, and the temperature is increased to 95-105 ℃.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4976979A (en) * | 1985-05-02 | 1990-12-11 | Skw Trostberg Aktiengesellschaft | Process for the decaffeination of tea |
| CN101986855A (en) * | 2009-07-30 | 2011-03-23 | 温尧林 | Method for preparing low-caffeine high-tea polyphenol tea powder |
| CN103815078A (en) * | 2014-02-26 | 2014-05-28 | 成都华高生物制品有限公司 | Method for extracting low-caffeine low-content tea polyphenol from fresh tea |
| CN104839411A (en) * | 2015-05-22 | 2015-08-19 | 江苏耐雀生物工程技术有限公司 | Method for reducing caffeine in instant tea |
| CN110651863A (en) * | 2019-10-24 | 2020-01-07 | 福建安溪铁观音集团股份有限公司 | Preparation process and production line of low-caffeine instant tea |
-
2022
- 2022-10-14 CN CN202211262439.2A patent/CN115553359A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4976979A (en) * | 1985-05-02 | 1990-12-11 | Skw Trostberg Aktiengesellschaft | Process for the decaffeination of tea |
| CN101986855A (en) * | 2009-07-30 | 2011-03-23 | 温尧林 | Method for preparing low-caffeine high-tea polyphenol tea powder |
| CN103815078A (en) * | 2014-02-26 | 2014-05-28 | 成都华高生物制品有限公司 | Method for extracting low-caffeine low-content tea polyphenol from fresh tea |
| CN104839411A (en) * | 2015-05-22 | 2015-08-19 | 江苏耐雀生物工程技术有限公司 | Method for reducing caffeine in instant tea |
| CN110651863A (en) * | 2019-10-24 | 2020-01-07 | 福建安溪铁观音集团股份有限公司 | Preparation process and production line of low-caffeine instant tea |
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