CN114467597A - Selenium-rich green tea with blood pressure lowering effect and selenium-rich planting and re-drying aroma-improving processing method thereof - Google Patents
Selenium-rich green tea with blood pressure lowering effect and selenium-rich planting and re-drying aroma-improving processing method thereof Download PDFInfo
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Images
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-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G17/00—Cultivation of hops, vines, fruit trees, or like trees
- A01G17/005—Cultivation methods
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C21/00—Methods of fertilising, sowing or planting
- A01C21/005—Following a specific plan, e.g. pattern
-
- 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
-
- 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
- A23F3/12—Rolling or shredding tea leaves
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C11/00—Other nitrogenous fertilisers
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/20—Liquid fertilisers
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Botany (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
Abstract
The invention belongs to the technical field of selenium-rich tea planting and processing, and provides selenium-rich green tea with a blood pressure lowering effect and a selenium-rich planting and re-drying aroma-improving processing method thereof. The selenium element in the tea is greatly improved by applying the glucosamine selenium fertilizer aqueous solution to the leaf surfaces or the roots of the tea trees; the picked fresh tea leaves are made into the selenium-rich green tea through the working procedures of withering, steam de-enzyming, rolling and deblocking, re-baking and aroma raising and the like. The selenium fertilizer glucosamine selenium adopted by the invention is organic selenium, has no accumulated toxicity to human body, and is safer compared with inorganic selenium fertilizer; compared with the prior art of enriching the selenium in the tea, the selenium enrichment capacity of the tea is stronger. In-vitro experiments show that the selenium-rich green tea has a remarkable blood pressure reducing effect, and the blood pressure reducing activity of the selenium-rich green tea is obviously higher than that of common green tea. The selenium-rich green tea prepared by the invention not only supplements selenium element necessary for human body, but also can assist in maintaining blood pressure balance after being drunk for a long time, and has good application prospect in hypertension patient groups.
Description
Technical Field
The invention belongs to the technical field of selenium-rich tea planting and processing, and relates to selenium-rich green tea with a blood pressure reducing effect and a selenium-rich planting and re-drying aroma-improving processing method thereof.
Background
Tea is the second largest beverage in the world next to water, mainly comprises tea polysaccharide, tea polyphenol, caffeine, mineral substances, amino acids and carbohydrates, has multiple functions of exciting central nerves, improving immunity, resisting oxidation, regulating glycolipid metabolic disturbance and the like, and meets the requirements of different people. Tea consumption helps to prevent or reduce the risk of cardiovascular disease, especially hypertension. Polyphenols extracted from green tea can reduce blood pressure of spontaneous hypertensive rats. The tea rich in gamma-aminobutyric acid can lower blood pressure of rats fed with high-salt diet, and prevent hypertension.
Selenium (Se) is a trace element necessary for human body, is closely related to health, and can also enhance the capabilities of tea in resisting diseases and insect pests, reducing fluorine, resisting heavy metal pollution and the like. Selenium cannot be synthesized in the human body and cannot be stored in the human body for a long time, and needs to be continuously taken from the outside. Relevant researches show that the recommended intake of the adults in China to the selenium is 60-400 mug per day, the average intake of the residents in China is only 44.6 mug per day, the intake of the selenium in 1 hundred million multi-person diets in China is insufficient, and the health level of the people is seriously threatened. The selenium-rich tea can effectively supplement the trace element selenium required by human body by drinking.
The natural selenium-rich tea is produced only in a few selenium-rich areas on the earth, and has the defects that the content of selenium in tea is difficult to control, and standardized production cannot be carried out. The prior selenium-rich tea technology has the following problems: (1) the invention discloses a mountain Yunwu selenium-rich tea and a planting method thereof as well as CN 111264273A and a selenium-rich green tea and a production method thereof as well as a patent CN 101099431A. (2) The selenium-rich capacity of the tea is weaker, the selenium content of the tea is not obviously increased, and the like, for example, CN112970500A discloses a planting method of nano-selenium organic tea, for example, the invention patent CN 105815176A discloses a production method of selenium-rich health care tea, and the selenium content in the prepared tea is only 0.20-0.55 mg/kg.
Disclosure of Invention
The invention aims to solve the problems of weak accumulated toxicity and selenium-rich capacity of residual inorganic selenium, unobvious increase of the selenium content of tea leaves and the like in the existing selenium-rich planting method of tea trees, and provides selenium-rich green tea with the blood pressure reducing effect and a processing method of selenium-rich planting and repeated drying aroma raising of the selenium-rich green tea.
The purpose of the invention can be realized by the following technical scheme:
a selenium-rich planting method of selenium-rich green tea with the efficacy of reducing blood pressure comprises the following steps:
m1: applying selenium fertilizer water solution on the tea tree;
m2: and (5) picking to obtain the selenium-rich fresh tea leaves.
Further, the selenium fertilizer is glucosamine selenium, and the preparation method of the selenium fertilizer aqueous solution is to dissolve a glucosamine selenium stock solution into water with the mass 16-32 times that of the glucosamine selenium stock solution;
the selenium content in the glucosamine selenium stock solution is 400-600 mg/L.
Further, the selenium fertilizer is applied in a mode that the selenium fertilizer water solution is uniformly sprayed on the leaf surfaces of the tea trees or the roots of the tea trees are subjected to drip irrigation.
Further, the beginning time of spraying the selenium fertilizer water solution on the tea tree leaf surfaces is the tea tree budding time;
spraying selenium fertilizer on the leaf surfaces for 3-6 times at intervals of 5-10 days, and spraying the selenium fertilizer on sunny days;
the dosage of the selenium fertilizer sprayed on the leaf surface is 0.5-1.5kg of glucosamine selenium per mu of tea garden.
Further, the starting time of drip irrigation of selenium fertilizer at the root of the tea tree is 1-3 months before the tea tree sprouts;
the dosage of the selenium fertilizer for root drip irrigation is 2-6kg of glucosamine selenium per mu of tea garden;
the drip irrigation position of the selenium fertilizer is soil within a radius range of 10-30cm away from the tea trees.
A processing method for re-baking and aroma-extracting of selenium-rich green tea with the efficacy of reducing blood pressure comprises the following steps:
1) withering fresh selenium-rich tea leaves, deactivating enzyme with steam, dehydrating with hot air, and air-cooling for dampening;
2) kneading and deblocking the tea leaves obtained in the step 1);
3) primarily drying and carding the tea leaves obtained in the step 2), secondarily drying and extracting fragrance, and screening to obtain the selenium-rich green tea.
Further, in the step 1), the picking standard of the fresh selenium-rich tea leaves is one-bud two-leaf or one-bud three-leaf;
in the tea withering process, the tea spreading height is less than 20cm, and the withering time is 4-6 h;
in the steam de-enzyming process, the steam temperature is 350-450 ℃, and the de-enzyming time is 40-45 s;
in the hot air dehydration process, the temperature of hot air is 150-170 ℃;
in the air cooling and moisture regaining process, the tea dehydrated by hot air is timely conveyed to a spreading and cooling bed to be uniformly spread, and the temperature is accelerated to be reduced.
Further, in the step 2), in the tea kneading process, a 6CR-40.45.55 type kneading machine is adopted to knead the air-cooled moisture regained tea;
the tea twisting and kneading time is 60-120min, and then the twisted and kneaded tea is deblocked.
Further, in the step 3), in the primary drying process of the tea, the drying temperature is 100-;
the re-baking and aroma-raising is repeated baking for 3-4 times at 110-150 ℃, and each time baking is 20-60 min.
A selenium-rich green tea with blood pressure lowering effect is prepared by the above method.
The key points of the invention are as follows:
(1) the selenium-rich planting method of the tea trees comprises the following steps: the selenium fertilizer type, the application method, the application amount and the application time are optimized, so that the selenium element content of the tea is improved to the maximum extent;
(2) the processing method of the fresh tea leaves comprises the following steps: by adopting a proper fresh tea leaf processing technology, the quality and flavor of the selenium-rich green tea are fully exerted, and simultaneously, the active ingredients of the tea for reducing blood pressure are greatly improved, so that the selenium-rich green tea with the significant activity of reducing blood pressure is prepared.
Compared with the prior art, the invention has the following innovations and advances:
(1) the selenium fertilizer glucosamine selenium adopted by the invention is organic selenium, has no accumulated toxicity to human body, and is safer compared with inorganic selenium fertilizers (such as sodium selenate and sodium selenite);
(2) compared with the prior tea tree selenium enrichment technology (the tea selenium content is 0.20-0.55mg/kg), the tea tree selenium enrichment technology has stronger selenium enrichment capability (the tea selenium content can reach 2.09 mg/kg);
(3) compared with the selenium-rich green tea produced by the traditional green tea process, the selenium-rich green tea produced by the re-drying process has stronger fragrance and more lasting tea fragrance.
(4) The selenium-rich green tea prepared by the fresh tea leaf processing method shows a remarkable blood pressure reducing effect by regulating the expression of factors related to oxidative stress, inflammation and endothelial functions in serum, has the blood pressure reducing activity obviously higher than that of common green tea, can assist in maintaining blood pressure balance after being drunk for a long time, and has a good application prospect in a population of hypertension patients.
Drawings
FIG. 1 is a flow chart of a process for preparing selenium-rich green tea with blood pressure lowering effect according to the present invention;
fig. 2 is a sensory evaluation of traditional selenium-enriched green tea (a and C) and redried selenium-enriched green tea (B and D).
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
a selenium-rich planting method of selenium-rich green tea with blood pressure lowering effect comprises the following steps:
1) completely dissolving glucosamine selenium stock solution with the selenium content of 500mg/L in water with the mass being 18 times that of the glucosamine selenium stock solution to prepare selenium fertilizer water solution;
2) applying a selenium fertilizer aqueous solution every 5 days from the beginning of tea tree budding in a tea garden, wherein the fertilizing amount is 1.0kg of glucosamine selenium per mu of tea garden, the fertilizing mode is that the selenium fertilizer aqueous solution is uniformly sprayed on the leaf surfaces, and the selenium fertilizer is preferably sprayed on the fine days;
3) and spraying the selenium fertilizer water solution for 5 times, and picking fresh tea leaves with two leaves and three leaves to obtain the selenium-enriched fresh tea leaves.
A processing method of selenium-rich green tea with the efficacy of reducing blood pressure comprises the following steps:
1) spreading and withering the fresh selenium-rich tea leaves, wherein the spreading height is 15cm, and the withering time is 6 h; then, carrying out steam deactivation at 400 ℃ for 40s, dehydrating for 5min by adopting hot air at 160 ℃, immediately conveying to a spreading cooling bed, uniformly spreading and cooling to room temperature to obtain air-cooled moisture regained tea leaves;
2) kneading the air-cooled moisture regained tea leaves for 80min by adopting a 6CR-40.45.55 type kneading machine, and deblocking to obtain kneaded tea leaves;
3) primarily baking the twisted tea leaves at 120 deg.C for 20min, baking at 120 deg.C for 30min, and baking repeatedly for 3 times to obtain selenium-rich green tea.
Example 2:
a selenium-rich planting method of selenium-rich green tea with blood pressure lowering effect comprises the following steps:
1) completely dissolving glucosamine selenium stock solution with selenium content of 600mg/L in water of 20 times of the mass to prepare selenium fertilizer water solution;
2) applying a selenium fertilizer aqueous solution every 6 days from the beginning of tea tree budding in a tea garden, wherein the fertilizing amount is 1.2kg of glucosamine selenium per mu of tea garden, the fertilizing mode is that the selenium fertilizer aqueous solution is uniformly sprayed on the leaf surfaces, and the selenium fertilizer is preferably sprayed on the fine days;
3) and spraying the selenium fertilizer water solution for 4 times, and picking fresh tea leaves with two leaves and three leaves to obtain the selenium-enriched fresh tea leaves.
A processing method for re-baking and aroma-extracting of selenium-rich green tea with the efficacy of reducing blood pressure comprises the following steps:
1) spreading and withering the fresh selenium-rich tea leaves, wherein the spreading height is 18cm, and the withering time is 5 h; then carrying out steam deactivation for 42s at 400 ℃, dehydrating for 8min by adopting hot air at 150 ℃, immediately conveying to a spreading cooling bed, uniformly spreading, cooling to room temperature, and cooling to obtain air-cooled moisture regained tea leaves;
2) kneading the air-cooled moisture regained tea leaves for 70min by adopting a 6CR-40.45.55 type kneading machine, and deblocking to obtain kneaded tea leaves;
3) primarily baking the twisted tea leaves at 120 deg.C for 30min, baking at 130 deg.C for 30min, and baking repeatedly for 4 times to obtain selenium-rich green tea.
Example 3:
a selenium-rich planting method of selenium-rich green tea with blood pressure lowering effect comprises the following steps:
1) completely dissolving glucosamine selenium stock solution with the selenium content of 400mg/L in water with the mass 16 times that of the glucosamine selenium stock solution to prepare selenium fertilizer water solution;
2) 1 month before tea tree sprouting, drip-irrigating the selenium fertilizer water solution in soil within a radius range of 10cm away from the tea tree, wherein the dosage of the drip-irrigating selenium fertilizer at the root is 3kg of glucosamine selenium per mu of tea garden;
3) and (4) picking fresh tea leaves with two leaves and three leaves to obtain the selenium-rich fresh tea leaves.
A processing method for re-baking and aroma-extracting of selenium-rich green tea with the efficacy of reducing blood pressure comprises the following steps:
1) spreading and withering the fresh selenium-rich tea leaves, wherein the spreading height is 10cm, and the withering time is 6 h; then, carrying out steam deactivation for 45s at 420 ℃, dehydrating for 5min by adopting hot air at 150 ℃, immediately conveying to a spreading cooling bed, uniformly spreading and cooling to room temperature to obtain air-cooled moisture regained tea leaves;
2) kneading the air-cooled and remoistened tea leaves for 70min by adopting a 6CR-40.45.55 type kneading machine, and deblocking to obtain kneaded tea leaves;
3) primarily baking the twisted tea leaves at 110 deg.C for 30min, baking at 130 deg.C for 20min, and baking repeatedly for 4 times to obtain selenium-rich green tea.
Example 4:
a selenium-rich planting method of selenium-rich green tea with blood pressure lowering effect comprises the following steps:
1) completely dissolving glucosamine selenium stock solution with selenium content of 600mg/L in 32 times of water by mass to prepare selenium fertilizer water solution;
2) drip-irrigating the selenium fertilizer aqueous solution in soil within a radius range of 30cm from the tea trees 3 months before the tea trees sprout, wherein the dosage of the drip-irrigating selenium fertilizer at the roots is 5kg of glucosamine selenium per mu of tea garden;
3) and (4) picking fresh tea leaves with two leaves and three leaves to obtain the selenium-rich fresh tea leaves.
A processing method of selenium-rich green tea with the efficacy of reducing blood pressure comprises the following steps:
1) spreading and withering the fresh selenium-rich tea leaves, wherein the spreading height is 10cm, and the withering time is 4 h; then, carrying out steam deactivation for 45s at 400 ℃, dehydrating for 8min by adopting hot air at 170 ℃, immediately conveying to a spreading cooling bed, uniformly spreading and cooling to room temperature to obtain air-cooled moisture regained tea leaves;
2) kneading the air-cooled moisture regained tea leaves for 90min by adopting a 6CR-40.45.55 type kneading machine, and deblocking to obtain kneaded tea leaves;
3) primarily baking the twisted tea leaves at 100 deg.C for 30min, baking at 140 deg.C for 40min, and baking repeatedly for 3 times to obtain selenium-rich green tea.
Example 5:
in this embodiment, the common green tea obtained by the same processing method without applying selenium fertilizer in the same experimental tea garden is used as a control, and the selenium-rich green tea prepared in embodiment 1 is used as an experimental example to verify the blood pressure lowering activity of the product of the present invention:
1. the content of selenium in the selenium-enriched green tea is measured by adopting a hydride-atomic fluorescence method (GB 5009.93-2017):
the analysis result shows that the selenium content of the selenium-rich green tea is 2.09 +/-0.12 mg/kg, which is obviously higher than the selenium content of the common green tea by 0.23 +/-0.05 mg/kg.
2. The in vitro blood pressure lowering activity experiment of the selenium-rich green tea adopts an Angiotensin Converting Enzyme (ACE) activity inhibition experiment: respectively pulverizing common green tea and selenium-rich green tea, ultrasonic extracting with 30 times of hot water (100 deg.C) for 15min, and repeating the extraction for 2 times. Centrifuging, mixing the supernatants, rotary evaporating for concentration, and lyophilizing to obtain common green tea extract and selenium-rich green tea extract. Common green tea extract and selenium-rich green tea extract samples to be tested are dissolved in HEPES buffer solution (pH 8.3), buffer solution is used as blank, and ACE enzyme activity A and blank ACE enzyme activity B of the samples are respectively determined.
ACE inhibition was calculated according to the following formula:
the results are shown in tables 1 and 2.
TABLE 1 Effect of different aqueous tea extracts on ACE inhibition (%)
Note: the values marked with different letters (a-b) on the same row differ significantly (p < 0.05).
TABLE 2 in vitro ACE inhibition IC of different aqueous tea extracts50Value of
Note: the values marked with different letters (a-b) on the same row differ significantly (p < 0.05).
Angiotensin converting enzyme plays an important role in the regulation of hypertension, and angiotensin converting enzyme can convert angiotensin i, which has a very low activity, into angiotensin ii, which has a strong vasomotor activity. Inhibition of angiotensinConvertase helps to inhibit the activity of angiotensin converting enzyme and reduce the production of angiotensin, thus causing vasodilatation and lowering blood pressure. From table, the ACE inhibition ratio IC of the selenium-rich green tea water extract50Is far lower than the common green tea water extract, has obvious ACE inhibiting effect and has potential blood pressure lowering effect.
3. The in vivo blood pressure lowering activity experiment of the selenium-rich green tea comprises the following steps:
(1) all animal experiments are strictly carried out according to the ethical standards of experimental animals of the Shanghai university Committee for the ethical and use of experimental animals (approval No. A2020080) and the national guidelines for welfare of experimental animals, so as to improve the welfare of animals and reduce the pain of experimental animals to the greatest extent. 24 (6/group) 8-week-old male Wistar rats were purchased from Shanghai Spiker laboratory animals GmbH and housed in Shanghai university of transportation animal laboratories. All rats had free access to food and water and the rat environment was kept at 25 + -1 deg.C, 70-75% humidity and 12h alternating light and dark.
Rats were acclimatized for 1 week prior to the experiment and then randomly divided into 4 groups, a blank group (normal diet + distilled water), a model group (8% high salt diet + distilled water), a normal green tea group (8% high salt diet +500mg normal green tea extract/kg rat/day) and a selenium-rich green tea group (8% high salt diet +500mg selenium-rich green tea extract/kg rat/day).
(2) The weight of the rats was measured every 3 weeks (initial, middle and late) during the feeding period using an electronic scale, and the results are shown in Table 3. The blood pressure of the rat is measured by a noninvasive caudal artery pressure method, the rat is placed in a 35 ℃ cage for 30min, after the rat is stabilized, a pulse and pressure sensor is placed at the tail of the rat to pressurize, the blood pressure value corresponding to the first pulse appearing after the pulse disappears is the systolic pressure, 3 continuous readings with the blood pressure value less than or equal to 10mmHg are recorded, the average value is taken, and the result is shown in table 4.
TABLE 3 mean body weight of rats in each group
Note: the values marked with different letters (a-b) in the same column differ significantly (p < 0.05).
TABLE 4 mean blood pressure values of rats in each group
Note: the values marked with different letters (a-c) in the same column differ significantly (p < 0.05).
As shown in table 3, tea leaves continuously intervened in rats for 9 weeks without significant effect on their body weight. The late blood pressure of the model group increased by 20.90% compared with the early blood pressure, while the late blood pressure of the common green tea group increased by 10.13% and 5.80% compared with the selenium-rich green tea group (Table 4). Compared with the model group, the blood pressure of the common green tea and the selenium-rich green tea group is obviously reduced, and the blood pressure regulating effect of the selenium-rich green tea group is superior to that of the common green tea group.
(3) Elevated blood pressure can affect cellular oxidative stress and inflammation and can lead to vascular dysfunction. After 9 weeks of continuous feeding of aqueous tea extract to rats, 8% chloral hydrate was used for anesthesia, blood was taken from the abdominal aorta, and serum oxidative stress and inflammatory factor levels including oxidative stress (GPX), inflammation (CRP), endothelial function (eNOS) were analyzed. As shown in table 5, high salt intake resulted in a decrease in GPX levels in serum and an increase in CRP levels, indicating an increase in oxidative stress and inflammation; at the same time, high salt diet resulted in a decrease in eNOs content, indicating that endothelial dysfunction was more severe.
TABLE 5 serum indices of rats in each group
Note: the values marked with different letters (a-c) in the same column differ significantly (p < 0.05).
Compared with a model group, the level of GPX is respectively increased by 20.64 percent and 37.86 percent through the intervention of water extracts of common green tea and selenium-rich green tea; the level of eNOS increased by 28.34%, 80.06%, respectively; the level of CRP was reduced by 10.94%, 46.56%, respectively. These results indicate that the selenium-rich green tea can effectively relieve oxidative stress, inflammation and endothelial dysfunction caused by blood pressure rise, and the relieving effect of the selenium-rich green tea is stronger than that of common green tea.
Example 6:
in the embodiment, the fresh tea leaves with selenium fertilizer applied in the embodiment 1 are compared with the traditional selenium-rich green tea prepared by a common green tea processing technology (green removing, kneading and drying), and the redried selenium-rich green tea prepared by a redrying technology is used as a test example to perform sensory evaluation (GB/T23776-.
As shown in fig. 2, sensory evaluation results show that both the traditional selenium-rich green tea and the redried selenium-rich green tea have strong fragrance, the traditional selenium-rich green tea mainly has faint scent with a little grass smell, and the redried selenium-rich green tea mainly has sweet fragrance with a little caramel fragrance. On the whole, compared with the traditional selenium-rich green tea, the re-baked selenium-rich green tea has stronger fragrance and more lasting tea fragrance.
Claims (10)
1. A selenium-rich planting method of selenium-rich green tea with the efficacy of reducing blood pressure is characterized by comprising the following steps:
m1: applying selenium fertilizer water solution on the tea trees;
m2: and (5) picking to obtain the selenium-rich fresh tea leaves.
2. The selenium-rich planting method of selenium-rich green tea with blood pressure lowering effect according to claim 1, wherein the selenium fertilizer is glucosamine selenium, and the selenium fertilizer water solution is prepared by dissolving a glucosamine selenium stock solution in 16-32 times of water by mass;
the selenium content in the glucosamine selenium stock solution is 400-600 mg/L.
3. The selenium-rich planting method of selenium-rich green tea with blood pressure lowering effect as claimed in claim 1, wherein the selenium fertilizer is applied by spraying the selenium fertilizer water solution uniformly on the leaf surface of the tea tree or by drip irrigation of the root of the tea tree.
4. The selenium-rich planting method of selenium-rich green tea with blood pressure lowering effect as claimed in claim 3, wherein the spraying of selenium fertilizer water solution on the leaf surface of tea tree is started when the tea tree sprouts;
spraying selenium fertilizer on the leaf surface for 3-6 times, wherein the interval is 5-10 days each time;
the dosage of the selenium fertilizer sprayed on the leaf surface is 0.5-1.5kg of glucosamine selenium per mu of tea garden.
5. The selenium-rich planting method of selenium-rich green tea with blood pressure lowering effect as claimed in claim 3, wherein the time for starting drip irrigation of selenium fertilizer water solution at the root of tea tree is 1-3 months before tea tree budding;
the dosage of the selenium fertilizer for root drip irrigation is 2-6kg of glucosamine selenium per mu of tea garden;
the drip irrigation position of the selenium fertilizer is soil within a radius range of 10-30cm away from the tea trees.
6. The processing method for re-drying and aroma-improving of the selenium-rich green tea with the efficacy of reducing blood pressure is characterized by comprising the following steps:
1) withering fresh selenium-rich tea leaves, deactivating enzyme with steam, dehydrating with hot air, and air-cooling for dampening;
2) kneading and deblocking the tea leaves obtained in the step 1);
3) primarily drying and carding the tea leaves obtained in the step 2), and secondarily drying and extracting fragrance to obtain selenium-rich green tea;
the selenium-rich green tea with the blood pressure lowering effect is obtained by the selenium-rich planting method of the selenium-rich green tea with the blood pressure lowering effect according to any one of claims 1 to 5.
7. The processing method for re-drying and aroma-improving of selenium-rich green tea with the efficacy of reducing blood pressure according to claim 6, wherein in the step 1), the picking standard of the fresh selenium-rich tea leaves is one-bud two-leaf or one-bud three-leaf;
in the tea withering process, the tea spreading height is less than 20cm, and the withering time is 4-6 h;
in the steam de-enzyming process, the steam temperature is 350-450 ℃, and the de-enzyming time is 40-45 s;
in the hot air dehydration process, the temperature of hot air is 150-170 ℃.
8. The processing method for re-baking and aroma-improving of selenium-rich green tea with blood pressure lowering effect as claimed in claim 6, wherein in the step 2), the tea leaves are kneaded by using a 6CR-40.45.55 type kneading machine during the kneading process;
the tea twisting and kneading time is 60-120min, and then the twisted and kneaded tea is deblocked.
9. The re-drying and aroma-improving processing method of selenium-rich green tea with blood pressure lowering effect as claimed in claim 6, wherein in the step 3), the drying temperature is 100-;
the re-baking and aroma-raising is repeated baking for 3-4 times at 110-150 ℃, and each time baking is 20-60 min.
10. Selenium-enriched green tea with blood pressure lowering effect, characterized by being prepared by the processing method of any one of claims 6 to 9.
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