CN102511585A - Method for preparing selenium-rich tea extract - Google Patents
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- CN102511585A CN102511585A CN2011104110613A CN201110411061A CN102511585A CN 102511585 A CN102511585 A CN 102511585A CN 2011104110613 A CN2011104110613 A CN 2011104110613A CN 201110411061 A CN201110411061 A CN 201110411061A CN 102511585 A CN102511585 A CN 102511585A
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Abstract
The invention discloses a method for preparing a selenium-rich tea extract, which comprises the following steps 1) acquiring selenium-rich green tea leaves with stable selenium content, wherein the selenium content of the selenium-rich green tea leaves is 500-5000 mum gg; 2) taking the selenium-rich green tea leaves as an extracted raw material, deactivating enzyme and extracting to obtain the selenium-rich tea extract. The selenium-rich tea extract can fully reserve the original local flavor of the green tea, high selenium content is provided, and the requirements for daily selenium supplement of people can be satisfied.
Description
Technical field
The present invention relates to rich selenium tea extractive technique field, be specifically related to a kind of preparation method of rich selenium tea extract.
Background technology
Selenium, symbol of element Se is a kind of micro elements needed by human, is the activated centre of glutathione peroxidase (GSH-Px).Have anticancer, anti-ageing (anti-oxidant) and improve biological characteristicses such as body immunity, antagonism heavy metal.Chinese Soclety of Nutrition recommends that every day, selenium intake was 50～200 micrograms per capita.But China adult's day selenium intake only has 26～32 micrograms now, and the selemium nutrition condition of poor is at China's ubiquity.There are 72% low selenium in county (city) or scarce selenium in China, and Heilungkiang, the Inner Mongol, Gansu, Qinghai, Sichuan etc. seriously lack the selenium area has Keshan disease, Kaschin-Beck disease to take place, and the certain cancers district occurred frequently also belongs to low selenium district.Human body is mainly taken in selenium through diet, therefore improves selenium level in the diet, is to solve the direct effective means that selemium nutrition lacks present situation.
China is the native place of tealeaves, the ancient country of tea, and the history of finding and utilizing tea tree to have approximately surplus in the of ten thousand year is the cradle that the mankind drank tea, planted tea, tea making.Contain multiple materials such as Tea Polyphenols, caffeine and lipopolysaccharides in the tealeaves to the human body beneficial.Have anti-oxidant, radioresistance, arousing brain, raising spirit, function such as lipopenicillinase is aid digestion.Tea has become the civilized and healthy beverage that has vitality most, gets consumer reception most in the world's three big beverages.Along with social economy is fast-developing, people's rhythm of life is accelerated, and health conveniently tea beverage receives people's favor day by day.The rich selenium tea extract that the present invention produces not only contains the health-care efficacy composition in the common tea beverage, can realize quantitative microelement-supplementing selenium simultaneously, improves daily selemium nutrition absorption level.
The method of producing tea beverage rich in selenium at present mainly contains following several kinds:
A kind of is in original common green tea extractive liquor, to add selenium.The edible Se-enriched liquid of its interpolation is to contain the edible articles for use processing of selenium by other.Substance classes has been different from traditional green tea soup juice in the beverage that this kind method is produced, and has destroyed the original local flavor of green tea.
Another kind is to utilize the selenium-enriched tea leaf that originates in rich selenium area to carry out the production of selenium-rich green tea beverage; But because the difference of the inhomogeneous and different regions of Se content tea leaf quality in the soil in original rich selenium area; Be difficult to guarantee the quantitatively controlled of Se content in the final tea beverage rich in selenium, and the stability of the local flavor of tea beverage.The present invention therefore.
Summary of the invention
The present invention provides a kind of production method of rich selenium tea extract; Comprise the Se content stable and controllable selenium-enriched tea leaf production and utilize selenium-enriched tea leaf to prepare the method for rich selenium tea extract; In the production process loss of selenium in the rich selenium tea is dropped to minimumly, and fully keep the original local flavor of green tea.
Technical scheme of the present invention is following:
A kind of preparation method of rich selenium tea extract is characterized in that said method comprising the steps of:
(1) obtain the stable selenium-rich green tea leaf of Se content, Se content is 500～5000 μ g/g in the said selenium-rich green tea leaf;
(2) serve as to extract raw material with the selenium-rich green tea leaf, after completing, carry out lixiviate and obtain rich selenium tea extract.Preferably, the production stage of selenium-rich green tea leaf may further comprise the steps in the said method:
(A1) the nanometer selenium plant nutrient agent is mixed with vermiculite, after spring tea is gathered beta pruning, promptly apply the tea place 7～August;
(A2) the nanometer selenium plant nutrient agent is mixed with fertile with tea tree, go into is to apply the tea place mid-November after autumn;
(A3) the nanometer selenium plant nutrient agent is mixed with vermiculite, in the coming year spring tea to gather previous month be late Febuary to apply the tea place;
(A4) the spring tea productive life, the exploitation fresh tea passes obtains the selenium-rich green tea leaf when the young sprout that 10%-15% is arranged on the tea tree reaches 1 bud, 2～3 leaves.
Preferably, the weight proportion of nanometer selenium plant nutrient agent and vermiculite is 1: 0.2～3 in the said method.
Preferably, tea tree is selected from common fertilizer or solid organic fertilizer with fertilizer in the said method.
Preferably, the fertilization mode that adopts in the said method is at the annular groove apart from wide dark each the 15～30cm of tea tree root 30cm place excavation, fertilizer evenly disperseed to be sprinkled in the ditch earthing bury.
Preferably, said method step (A1) applies that total Se content is 10～50g/ mu in the fertilizer in tea place, applies in the step (A2) that total Se content is 40～200g/ mu in the fertilizer in tea place, applies in the step (3) that total Se content is 20～100g/ mu in the fertilizer in tea place.
Preferably, complete in the said method and select for use steam beating or hot air water-removing or microwave de-enzyming mode to carry out; When adopting steam beating, fixation time 5～10min, material temperature are controlled between 85～95 ℃; When adopting hot air water-removing, fixation time 7～10min, material temperature are controlled between 85～95 ℃; When adopting microwave de-enzyming, the microwave power of employing is 7～10kw, and fixation time 2～3.5min, material temperature are controlled to be 52～85 ℃.
Preferably, said method adopts the microwave de-enzyming method, and microwave power is 8～9kw, and fixation time 2.5～3min, material temperature are controlled at 55～85 ℃.
Preferably, the extractant that lixiviate is adopted in the said method is selected from water or ethanol and mixed solvent thereof; The leaching liquor addition is 30～70 times of tealeaves, and extraction temperature is 80～100 ℃.
Preferably, the pH value of leaching liquor is 7.2～8.5 in the said method, and extraction temperature is 85～95 ℃.
The present invention at first provides a kind of method of producing quantitative selenium-rich green tea, is called for short rich selenium tea afterwards, and its Se content is 500～5000 μ g/g.Said rich selenium tea is to add the nanometer selenium plant nutrient agent that Suzhou selenium paddy Science and Technology Ltd. produces in the production cycle tea tree, and model is XGP001A.Its production stage comprises that (1) after spring tea is gathered beta pruning, applies the tea place with selenium-rich nutritive agent (nanometer selenium plant nutrient agent mix with vermiculite obtain) 7～August; (2) the nanometer selenium plant nutrient agent is mixed with fertile with tea tree, go into to apply mid-November the tea place after autumn; (3) selenium-rich nutritive agent (nanometer selenium plant nutrient agent mix with vermiculite obtain) is applied the tea place in spring tea previous month late Febuary of gathering in the coming year.
As optimization, the nanometer selenium plant nutrient agent mixes with vermiculite weight proportion 1: 0.2～3 in the said selenium-rich nutritive agent.As optimization, tea tree comprises common fertilizer or solid organic fertilizer etc. with fertilizer described in the step (2).As optimization, in the step (1) (2) (3), fertilizer applies the tea place, is at the annular groove apart from wide dark each the 15～30cm of tea tree root 30cm place excavation, the selenium-rich nutritive agent is evenly disperseed to be sprinkled in the ditch earthing bury.
As optimization; Apply in the step (1) that total Se content is 10～50g/ mu in the selenium-rich nutritive agent in tea place; Apply in the step (2) that total Se content is 40～200g/ mu in the selenium-rich nutritive agent in tea place, apply in the step (3) that total Se content is 20～100g/ mu in the selenium-rich nutritive agent in tea place.
Nanometer selenium plant selemium nutrition according to the invention agent for selenium paddy Science and Technology Ltd. produces, forms the selenium-rich nutritive agent with a certain proportion of vermiculite mixing.The effect that mixes is that the amount of using the nanometer selenium plant nutrient agent is less, and mixed vermiculite can be convenient to use; Improve the gas permeability of soil and alleviate soil microenvironment pH acute variation, the selenium in the selenium-rich nutritive agent is slowly discharged, reduce the leaching loss of selenium in the nutritional agents, prolong fertilizer efficiency.
The present invention combines the upgrowth situation of the different physiological periods of tea tree, and applying the selenium-rich nutritive agent summer is that tea tree accumulates a certain amount of selenium in summer in the growth course, improves tea tree Se content background values; The underground root growth of autumn and winter season tea tree is vigorous, and apply the selenium-rich nutritive agent this moment, can significantly improve absorption and the deposit of tea tree root to selenium; Before spring tea is gathered, be the period that tealeaves is concentrated growth,, can guarantee to guarantee selenium-enriched tea leaf output and quality for tealeaves provides sufficient and stable selenium in conjunction with a large amount of selenium of root accumulation autumn and winter and the selenium-rich nutritive agent of appending this moment.
Rich selenium tea extract according to the invention is to produce rich selenium tea through processing with above-mentioned steps.Se content is 5～100 μ g/kg in the rich selenium tea extract.
The present invention comprises with the concrete steps of the rich selenium extract of selenium-enriched tea leaf production: pluck bright leaf, put at the stand, completes, and pulverizes lixiviate, Filtration Adsorption, additive, encapsulation sterilization.
The spring tea productive life,, exploits the young sprout that 10%-15% is arranged on the rich selenium tea tree bright selenium-enriched tea leaf when reaching 1 bud, 2～3 leaves.
The new rich selenium tea tealeaves of plucking is divided in the lucifuge ventilation, and 2～6h is put in cold, preferred 3～5h.
Rich selenium tea completes and adopts steam beating or hot air water-removing or microwave de-enzyming among the present invention.Steam beating time 5～10min, the selenium-enriched tea leaf temperature control is between 85～95 ℃; Hot air water-removing time 7～10min, the selenium-enriched tea leaf temperature control is between 85～95 ℃; Microwave de-enzyming, power 7～10kw, 2～3.5min, the selenium-enriched tea leaf temperature control is made as 52～85 ℃.
As preferably, rich selenium tea adopts the microwave de-enzyming method, and more preferably power is 8～9kw, the 2.5～3min that completes, and the selenium-enriched tea leaf temperature control is at 55～85 ℃.Microwave de-enzyming tealeaves temperature raises from inside to outside, and it is minimum that test detects in the microwave de-enzyming process in the tealeaves Tea Polyphenols, caffeine, vitamin and chlorophyll content loss.Further preferred microwave de-enzyming selenium-enriched tea leaf temperature is controlled at 65～70 ℃.Regulate the selenium-enriched tea leaf temperature through the control ventilation, guarantee to complete under the effect prerequisite, it is minimum to cause the volatilization loss of selenium to drop to rich selenium tea Yin Gaowen.
The soaking and stirring lixiviate is used in the lixiviate of rich selenium tea, and extractant can be ORGANIC SOLVENT MIXTURES such as organic solvents such as water, ethanol, water and ethanol etc., is preferably water.
The rich selenium tea of production process leaching liquor addition is 30～70 times of tealeaves, and preferred 45～55 times, temperature is 80～100 ℃.
As preferably, can select extract is boiled the degassing, under non-oxide condition, extract, prevent the extract oxidative deformation.
As preferably, it is 7.2～8.5 weakly alkaline environment that leaching liquor is regulated the pH value in advance, and alkaline environment helps the extraction of selenium-containing compound in the rich selenium tea.
The rich selenium tea of soaking and stirring lixiviate production process extraction time is 1～30min, preferred 5～20min.Speed of agitator is 3～30r/min, preferred 5～15r/min.The leaching liquor temperature is preferably 85～95 ℃.
When rich selenium tea leaching liquor is produced in the lixiviate of rich selenium tea,, different with extraction time condition such as original Tea Polyphenols, caffeine, vitamin in the tealeaves because of the required time of leaching of selenium in the rich selenium tea.The extraction time of selenium obviously shortens in the rich selenium tea under specific alkali condition, and original flavor substance and nutriment leaching rate are higher relatively in the tealeaves.It is higher to obtain Se content, and the good selenium-rich green tea leaching liquor of local flavor.
After treating that rich selenium tea extract is cooled to room temperature, regulating extracting liquid pH value is 4.5～5.5, and in extract, adds adsorbent.Adsorbent can be vermiculite, active carbon etc.In order to elementary sediment in the deposition leaching liquor and absorption two-stage precipitation thing.
Centrifugal filtration through centrifugal filtration, is removed wherein sediment and adsorbent with said extracted liquid, reaches bottled tea drinks clarity standard.
Allotment.The rich selenium tea extract that the present invention obtains can be allocated spices, anti-oxidant, emulsifying agent, flavoring, sweet taste material, acid flavoring, vitamin etc. with cooperating separately.
Container of the present invention is adorned rich selenium tea extract, under the condition of food hygiene law regulation, carries out sterilization, can.
Compare prior art, the present invention has following beneficial effect:
The rich selenium tea extract that the present invention obtains can fully keep the original local flavor of green tea, can have higher Se content again, and the daily selenium that satisfies drinking person replenishes needs.
The specific embodiment:
Following examples are used to explain the present invention, but can not be used for limiting scope of the present invention.The implementation condition that adopts among the embodiment can be done further adjustment according to the condition of concrete producer, and unaccounted implementation condition is generally the condition in the normal experiment.
The Tea Polyphenols assay method that adopts in following examples is by GB8313-2002 " tea--Tea Polyphenols is measured ", the total quantitative determination of tea polyphenolic compounds-ferrous tartrate colorimetric method.The caffeine assay method is pressed GB8312-2002 " tea-caffeine is measured ", the total quantitative determination-ultraviolet spectrophotometry of caffeine.The Se content assay method is pressed GB 5009.93-2010 " mensuration of selenium in the food ", detects Se content with the hydride generation atomic fluorescence spectroscopic methodology.
Embodiment 1～3 different cultivation conditions obtain rich selenium fresh tea passes
Embodiment 1
Produce rich selenium tea 1.The Tea Production base in Jiangsu Province.Suzhou selenium paddy science and technology nanometer selenium plant nutrient agent is mixed with vermiculite, obtain the selenium-rich nutritive agent, after spring tea is gathered beta pruning, apply the tea place 7～August, applying the total selenium amount in tea place is 10g/ mu; (2) the nanometer selenium plant nutrient agent is mixed with fertile with tea tree, go into to apply mid-November the tea place after autumn.Applying the total selenium amount in tea place is 40g/ mu; (3) the nanometer selenium plant nutrient agent is mixed with vermiculite, obtain the selenium-rich nutritive agent, apply the tea place in spring tea previous month late Febuary of gathering in the coming year, applying the total selenium amount in tea place is 20g/ mu.
Embodiment 2
Produce rich selenium tea 2.The Tea Production base in Jiangsu Province.Suzhou selenium paddy science and technology nanometer selenium plant nutrient agent is mixed with vermiculite, obtain the selenium-rich nutritive agent, after spring tea is gathered beta pruning, apply the tea place 7～August, applying the total selenium amount in tea place is 25g/ mu; (2) the nanometer selenium plant nutrient agent is mixed with fertile with tea tree, go into to apply mid-November the tea place after autumn.Applying the total selenium amount in tea place is 100g/ mu; (3) the nanometer selenium plant nutrient agent is mixed with vermiculite, obtain the selenium-rich nutritive agent, apply the tea place in spring tea previous month late Febuary of gathering in the coming year, applying the total selenium amount in tea place is 50g/ mu.
Embodiment 3
Produce rich selenium tea 3.The Tea Production base in Jiangsu Province.Suzhou selenium paddy science and technology nanometer selenium plant nutrient agent is mixed with vermiculite, obtain the selenium-rich nutritive agent, after spring tea is gathered beta pruning, apply the tea place 7～August, applying the total selenium amount in tea place is 50g/ mu; (2) the nanometer selenium plant nutrient agent is mixed with fertile with tea tree, go into to apply mid-November the tea place after autumn.Applying the total selenium amount in tea place is 200g/ mu; (3) the nanometer selenium plant nutrient agent is mixed with vermiculite, obtain the selenium-rich nutritive agent, apply the tea place in spring tea previous month late Febuary of gathering in the coming year, applying the total selenium amount in tea place is 100g/ mu.
In spring in the coming year, when the young sprout that 10%-15% is arranged on the rich selenium tea tree reaches 1 bud, 2～3 leaves, gather bright selenium-enriched tea leaf, and detect the dry weight Se content.Result such as table 1
The rich selenium tea of table 1 selenium dry weight content
Embodiment 4～7 different fixing method instances
Embodiment 4
The rich selenium tea of getting after let slip at the stand 3 is an amount of, divides equally two parts.A steam beating time 8min, the selenium-enriched tea leaf temperature control is between 85～95 ℃, and selenium-enriched tea leaf 1 must complete.If three reprocessings.With GB 5009.93-2010 " mensuration of selenium in the food " hydride generation atomic fluorescence spectroscopic methodology, detect the rich selenium tea Se content in back that do not complete and complete respectively.Detect Tea Polyphenols and caffeine content in the rich selenium tea in back that do not complete and complete simultaneously.
Embodiment 5
The rich selenium tea of getting after let slip at the stand 3 is an amount of, divides equally two parts.A hot air water-removing time 8min, the selenium-enriched tea leaf temperature control is between 85～95 ℃, and selenium-enriched tea leaf 2 must complete.If three reprocessings.With GB 5009.93-2010 " mensuration of selenium in the food " hydride generation atomic fluorescence spectroscopic methodology, detect the rich selenium tea Se content in back that do not complete and complete respectively.Detect Tea Polyphenols and caffeine content in the rich selenium tea in back that do not complete and complete simultaneously.
Embodiment 6
The rich selenium tea of getting after let slip at the stand 3 is an amount of, divides equally two parts.A microwave de-enzyming time 2.5min, power 8kw, the selenium-enriched tea leaf temperature control is between 70～80 ℃, and selenium-enriched tea leaf 3 must complete.If three reprocessings.With GB 5009.93-2010 " mensuration of selenium in the food " hydride generation atomic fluorescence spectroscopic methodology, detect the rich selenium tea Se content in back that do not complete and complete respectively.Detect Tea Polyphenols and caffeine content in the rich selenium tea in back that do not complete and complete simultaneously.
Embodiment 7
The rich selenium tea of getting after let slip at the stand 3 is an amount of, divides equally two parts.A microwave de-enzyming time 2.5min, power 8kw, the selenium-enriched tea leaf temperature control is between 65～70 ℃, and selenium-enriched tea leaf 4 must complete.If three reprocessings.With GB 5009.93-2010 " mensuration of selenium in the food " hydride generation atomic fluorescence spectroscopic methodology, detect the rich selenium tea Se content in back that do not complete and complete respectively.Detect Tea Polyphenols and caffeine content in the rich selenium tea in back that do not complete and complete simultaneously.
The different fixing methods of table 2 are to composition influence in the selenium-enriched tea leaf
Embodiment 8～14 different extracting condition instances
Embodiment 8
Get the rich selenium tea 4 that completes, weigh.50 times of tealeaves weight of water.The rich selenium tea of soaking and stirring lixiviate, extraction time is 15min, speed of agitator is 12r/min.The leaching liquor temperature is 85 ℃.Obtain rich selenium tea leaching liquor 1.Detect rich selenium tea leaching liquor 1 Se content, and ask 5 experts that sample tea to judge the millet paste quality.Detect simultaneously and do not extract tealeaves and extract Se content in the tea grounds of back, weighing tea grounds weight is to calculate selenium leaching rate in the tealeaves.
Embodiment 9
Get the rich selenium tea 4 that completes, weigh.50 times of tealeaves weight of water.Diffusion water is adjusted to pH=5.2.The rich selenium tea of soaking and stirring lixiviate, extraction time is 15min, speed of agitator is 12r/min.The leaching liquor temperature is 85 ℃.Obtain rich selenium tea leaching liquor 2.Detect rich selenium tea leaching liquor 2 Se contents, and ask 5 experts that sample tea to judge the millet paste quality.Detect simultaneously and do not extract tealeaves and extract Se content in the tea grounds of back, weighing tea grounds weight is to calculate selenium leaching rate in the tealeaves.
Embodiment 10
Get the rich selenium tea 4 that completes, weigh.50 times of tealeaves weight of water.Diffusion water is adjusted to pH=7.2.The rich selenium tea of soaking and stirring lixiviate, extraction time is 15min, speed of agitator is 12r/min.The leaching liquor temperature is 85 ℃.Obtain rich selenium tea leaching liquor 2.Detect rich selenium tea leaching liquor 3 Se contents, and ask 5 experts that sample tea to judge the millet paste quality.Detect simultaneously and do not extract tealeaves and extract Se content in the tea grounds of back, weighing tea grounds weight is to calculate selenium leaching rate in the tealeaves.
Embodiment 11
Get the rich selenium tea 4 that completes, weigh.50 times of tealeaves weight of water.Diffusion water is adjusted to pH=7.8.The rich selenium tea of soaking and stirring lixiviate, extraction time is 15min, speed of agitator is 12r/min.The leaching liquor temperature is 85 ℃.Obtain rich selenium tea leaching liquor 2.Detect rich selenium tea leaching liquor 4 Se contents, and ask 5 experts that sample tea to judge the millet paste quality.Detect simultaneously and do not extract tealeaves and extract Se content in the tea grounds of back, weighing tea grounds weight is to calculate selenium leaching rate in the tealeaves.
Embodiment 12
Get the rich selenium tea 4 that completes, weigh.50 times of tealeaves weight of water.Diffusion water is adjusted to pH=8.0.The rich selenium tea of soaking and stirring lixiviate, extraction time is 15min, speed of agitator is 12r/min.The leaching liquor temperature is 85 ℃.Obtain rich selenium tea leaching liquor 2.Detect rich selenium tea leaching liquor 5 Se contents, and ask 5 experts that sample tea to judge the millet paste quality.Detect simultaneously and do not extract tealeaves and extract Se content in the tea grounds of back, weighing tea grounds weight is to calculate selenium leaching rate in the tealeaves.
Embodiment 13
Get the rich selenium tea 4 that completes, weigh.50 times of tealeaves weight of water.Diffusion water is adjusted to pH=8.5.The rich selenium tea of soaking and stirring lixiviate, extraction time is 15min, speed of agitator is 12r/min.The leaching liquor temperature is 85 ℃.Obtain rich selenium tea leaching liquor 2.Detect rich selenium tea leaching liquor 6 Se contents, and ask 5 experts that sample tea to judge the millet paste quality.Detect simultaneously and do not extract tealeaves and extract Se content in the tea grounds of back, weighing tea grounds weight is to calculate selenium leaching rate in the tealeaves.
Embodiment 14
Get the rich selenium tea 4 that completes, weigh.50 times of tealeaves weight of water.The rich selenium tea of soaking and stirring lixiviate, extraction time is 25min, speed of agitator is 12r/min.The leaching liquor temperature is 85 ℃.Obtain rich selenium tea leaching liquor 7.Detect rich selenium tea leaching liquor 1 Se content, and ask 5 experts that sample tea to judge the millet paste quality.Detect simultaneously and do not extract tealeaves and extract Se content in the tea grounds of back, weighing tea grounds weight is to calculate selenium leaching rate in the tealeaves.The selenium-rich green tea extract analysis result such as the table 3 of preparation.
The selenium-rich green tea extract analysis result of table 3 preparation
Above-mentioned instance only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the people who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalent transformations that spirit is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
Claims (10)
1. the preparation method of a rich selenium tea extract is characterized in that said method comprising the steps of:
(1) obtain the stable selenium-rich green tea leaf of Se content, Se content is 500 ~ 5000 μ g/g in the said selenium-rich green tea leaf;
(2) serve as to extract raw material with the selenium-rich green tea leaf, after completing, carry out lixiviate and obtain rich selenium tea extract.
2. method according to claim 1 is characterized in that the production stage of selenium-rich green tea leaf in the said method may further comprise the steps:
(A1) the nanometer selenium plant nutrient agent is mixed with vermiculite, after spring tea is gathered beta pruning, promptly apply the tea place 7 ~ August;
(A2) the nanometer selenium plant nutrient agent is mixed with fertile with tea tree, go into is to apply the tea place mid-November after autumn;
(A3) the nanometer selenium plant nutrient agent is mixed with vermiculite, in the coming year spring tea to gather previous month be late Febuary to apply the tea place;
(A4) the spring tea productive life, the exploitation fresh tea passes obtains the selenium-rich green tea leaf when the young sprout that has 10%-15% on the tea tree reaches 1 bud, 2 ~ 3 leaves.
3. method according to claim 2 is characterized in that the weight proportion of nanometer selenium plant nutrient agent and vermiculite is 1 ︰ 0.2 ~ 3 in the said method.
4. method according to claim 2 is characterized in that tea tree is selected from common fertilizer or solid organic fertilizer with fertilizer in the said method.
5. method according to claim 2, the fertilization mode that it is characterized in that adopting in the said method be at the annular groove of wide dark each 15 ~ 30 cm of excavation apart from tea tree root 30 cm places, fertilizer evenly disperseed to be sprinkled in the ditch earthing bury.
6. method according to claim 2; It is characterized in that said method step (A1) applies that total Se content is 10 ~ 50 g/ mus in the fertilizer in tea place; Apply in the step (A2) that total Se content is 40 ~ 200 g/ mus in the fertilizer in tea place, apply in the step (3) that total Se content is 20 ~ 100 g/ mus in the fertilizer in tea place.
7. method according to claim 1 is characterized in that completing in the said method and selects for use steam beating or hot air water-removing or microwave de-enzyming mode to carry out; When adopting steam beating, fixation time 5 ~ 10 min, material temperature are controlled between 85～95 ℃; When adopting hot air water-removing, fixation time 7 ~ 10 min, material temperature are controlled between 85～95 ℃; When adopting microwave de-enzyming, the microwave power of employing is 7 ~ 10 kw, and fixation time 2 ~ 3.5 min, material temperature are controlled to be 52 ~ 85 ℃.
8. method according to claim 1 is characterized in that said method adopts the microwave de-enzyming method, and microwave power is 8 ~ 9 kw, and fixation time 2.5 ~ 3 min, material temperature are controlled at 55 ~ 85 ℃.
9. method according to claim 1 is characterized in that the extractant that lixiviate is adopted in the said method is selected from water or ethanol and mixed solvent thereof; The leaching liquor addition is 30 ~ 70 times of tealeaves, and extraction temperature is 80 ~ 100 ℃.
10. method according to claim 1, the pH value that it is characterized in that leaching liquor in the said method is 7.2 ~ 8.5, extraction temperature is 85 ~ 95 ℃.
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| CN106418536A (en) * | 2016-09-23 | 2017-02-22 | 河源市兴睿食品科技开发有限公司 | Selenium-enriched extract and manufacture method thereof |
| CN109665914A (en) * | 2019-01-29 | 2019-04-23 | 广东暨创硒源纳米研究院有限公司 | Application of the polysaccharide composite nanometer selenium in Se rich tea production |
| CN110150418A (en) * | 2018-03-02 | 2019-08-23 | 浙江东来药业有限责任公司 | A kind of technique for extracting selenium from tealeaves |
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| CN106418536A (en) * | 2016-09-23 | 2017-02-22 | 河源市兴睿食品科技开发有限公司 | Selenium-enriched extract and manufacture method thereof |
| CN110150418A (en) * | 2018-03-02 | 2019-08-23 | 浙江东来药业有限责任公司 | A kind of technique for extracting selenium from tealeaves |
| CN109665914A (en) * | 2019-01-29 | 2019-04-23 | 广东暨创硒源纳米研究院有限公司 | Application of the polysaccharide composite nanometer selenium in Se rich tea production |
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