CN1161028C - Instant tea and its preparing process - Google Patents

Instant tea and its preparing process Download PDF

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Publication number
CN1161028C
CN1161028C CNB011160454A CN01116045A CN1161028C CN 1161028 C CN1161028 C CN 1161028C CN B011160454 A CNB011160454 A CN B011160454A CN 01116045 A CN01116045 A CN 01116045A CN 1161028 C CN1161028 C CN 1161028C
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China
Prior art keywords
tea
inspissated juice
instant tea
concentrated
ultrafiltration
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CNB011160454A
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CN1316192A (en
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罗龙新
钱晓军
颜泽松
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Shenzhen Shenbao Huacheng Science & Technology Co Ltd
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Shenzhen Shenbao Huacheng Foods Co Ltd
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Abstract

The present invention relates to a method for making instant tea by means of the combination of ultrafiltration, reverse osmosis and vacuum concentration, which more specifically comprises the following steps that tea is preliminarily extracted by means of a conventional method so as to obtain coarse filtrate liquid; then, the extract liquid of the tea is filtered by means of ultrafiltration, and ultrafiltration liquid is concentrated by a reverse osmosis membrane till the ultrafiltration liquid contains more than 5% of solid substances so as to obtain concentrated juice I; next, 1/2 to 2/3 of the concentrated juice I is concentrated in vacuum till the concentrated juice I contains 30% to 35% of solid substances so as to obtain concentrated juice II; after that the residual concentrated juice I and the concentrated juice II are uniformly mixed with each other so as to obtain concentrated juice III; finally, spray drying or freeze drying is carried out to the concentrated juice III so as to obtain the instant tea.

Description

Instant tea and manufacture method thereof
The present invention is a kind of instant beverage and preparation method thereof, particularly relates to a kind of preparation method and prepared instant tea thereof of instant tea.
Instant beverage is the product of more and more faster rhythm of life.At present, commercially available drink variety is single, the nutrition scarcity.Tealeaves is used as excellent beverage for many years as the traditional beverage of China always.But because tealeaves makes it drink inconvenience, not quick, inconsistent with modern's fast pace, so be badly in need of a kind of product that can satisfy this contradiction of exploitation.
In the prior art, the instant tea powder manufacture method is with tealeaves hot water lixiviate, and tea is carried isolated by filtration through filter cloth or filter, after vacuum concentrates, adopts spray-drying or freeze drying at last then.But, adopting above-mentioned manufacture method, the cold cut of instant tea product is relatively poor, and the brown stain of soup look severe oxidation, owes clarification, flavour slaking, fragrance poorness.Particularly the loss of aroma of tea is serious.Be the problem of the quality poorness that solves instant tea powder, people have studied to add various additives (as excipient, essence, sodium acid carbonate) or change in tea juice and have concentrated or the method for spray-dired technological parameter is made the instant tea powder product.But the instant tea fragrance that above method makes is still relatively poor.
Wherein, Chinese patent notification number CN1039525A discloses a kind of technology for processing instant tea.This method is that fresh tea passes is obtained fresh tea juice with pressing method, and filter at the beginning of carrying out then, ultrafiltration, counter-infiltration (RO) concentrate, and according to different raw materials, adopts freeze drying or spray-drying to make product.This kind method can keep original tea aroma, flavour preferably.But, make tea juice concentrate the extremely difficult raising of 20% back concentration because there is the concentration polarization phenomenon in the RO film.The concentration of tea juice only can reach below the 20-25%.The patent disclosure of notification number CN1154798A a kind of manufacturing process of instant tea be that tealeaves soaks in cold distilled water, tea extract is got its supernatant and is directly concentrated through reverse osmosis membrane (RO) after coarse filtration and smart filter, carries out the manufacture method of vacuum freeze drying again.The instant tea that this method makes can keep the original color of tealeaves preferably.But directly adopt the RO film to concentrate, because without ultrafiltration, colloid in the tea juice and impurity still are taken in tea juice, it is poor to surpass into tea juice clarity, and colloid and impurity very easily stop up the RO film simultaneously, cause cycles of concentration very low, and only adopt the RO film to concentrate, its ultimate density is only below 20-25%.Notification number CN1101506A discloses a kind of novel inspissated juice health drink new method.This method be with tea extract after filter just, vacuum concentrate, obtain a kind of tea juice concentrating through ultrafiltration again, though this method has solved clearing up problems of millet paste, owing to adopt vacuum concentrate method fully, thereby the fragrance of tea juice is also relatively poor.
The objective of the invention is to be to provide a kind of financial cost low, and can produce the manufacture method of high-quality instant tea powder.With instant tea powder easily dissolving in cold water that this method is produced, dissolving back millet paste clear, fragrance keeps better.
The present invention also aims to provide have and directly brew roughly the same fragrance, soup look, the mouthfeel of tea of drinking, and have the instant tea powder of fine solubility and transparency with boiling water with tealeaves such as green tea, oolong tea, black tea, jasmine tea.
Technical scheme of the present invention is as follows:
At first, tealeaves is dropped in the extractor, the hot-water soak that adds 50-70 ℃ is extracted, and obtains tea extract.After the fluid tea extract is cooled to room temperature, adopts flame filter press or butterfly centrifugal machine, obtain the coarse filtration liquid of tea extract the trickle tealeaves particle or the Impurity removal that contain in the extract.
Tea coarse filtration liquid with said method obtains filters with milipore filter, and before entering ultrafiltration, tea coarse filtration liquid is used the secondary filter membrane filtration in advance, with the subparticle in the further removal tea.The secondary filter film can adopt the polypropylene fibre membrane cartridge, and the aperture is at 3-10 μ m.Milipore filter adopts polypropylene hollow fiber membrane, and its molecular cut off is between 70,000-100,000 dalton.Ultrafiltration membrance filter tea juice assists in removing the macromolecular compound in the tea extract, easily forms muddy compound as pectin, protein, soluble starch etc.The milipore filter molecular cut off can not be lower than 70,000, otherwise the active ingredient in the tea extract can be trapped, as Tea Polyphenols, caffeine, theaflavin and congo red element etc.
The ultrafiltration that said method is obtained (UF) concentrates with reverse osmosis membrane (RO) through liquid then, the advantage that concentrates with reverse osmosis membrane is because it concentrates for non-heating, thereby the fragrance component in the tea liquid can loss, and being in the tea liquid hides material and also can not produce oxidizing brown stain because of heating.The reverse osmosis membrane concentration time is long, can cause that also tea juice temperature rises, thereby need the temperature of tea liquid in the control reverse osmosis process, preferably is controlled between 20-35 ℃.Reverse osmosis membrane concentrates the concentration of solid content in the tea liquid is reached more than 5%, different relatively teas and decide, and preferably solid concentration is 10-20%.Because of concentration is too low, required vacuum concentration time is long, the easy oxidation of fragrance, brown stain and deterioration.If the too high then counter-infiltration of solid content (RO) required time is long, easily cause tea juice temperature to rise, fragrance worsens, and uneconomical.
, will through the inspissated juice (concentrate meter I) of counter-infiltration (RO) pre-concentration take out the 1/2-2/3 of its weight, and carry out vacuum and concentrate thereafter.The method that vacuum concentrates is also without particular limitation.Preferred adopt 40-45 ℃ cryogenic vacuum to concentrate, tea juice concentrating I is concentrated into contains solid content and be higher than 30%, preferably be controlled in the 30-35% scope, what obtain like this is inspissated juice II.
Then, the remaining inspissated juice I that concentrates through RO and the inspissated juice II that concentrates with vacuum are mixed inspissated juice III; Inspissated juice III is carried out spray-drying or freeze drying, obtain instant tea with the inventive method preparation.
Wherein, when the solid content that sees through liquid in the process of counter-infiltration reaches 0.2-0.8%, it is reclaimed from newly joining wait for the tea that concentrates and carry out reverse osmosis concentration again, reduced loss like this.
Because method of the present invention has overcome defective of the prior art, thus the instant tea powder of producing easily dissolving in cold water, dissolving back millet paste clear, fragrance keeps better.Have with tealeaves such as green tea, oolong tea, black tea, jasmine tea and directly brew roughly the same fragrance, soup look, the mouthfeel of tea of drinking, and have the fast Lip river tea powder of fine solubility and transparency with boiling water.Owing to partly adopted vacuum to concentrate,, partly mixed the inspissated juice that only adopts counter-infiltration (RO) to obtain simultaneously simultaneously, made the tea powder keep original fragrance of tealeaves and nutrition so the extraction concentration of tea is greatly improved.
Below the present invention is specifically described with embodiment and comparative example.Should be understood that these embodiment just to the present invention is illustrated, and do not mean that and limit the invention.
Embodiment 1
Put into 150kg hot water with 10kg green tea, lixiviate is after 20 minutes, and tea is extracted juice with 80 eye mesh screen isolated by filtration, uses the secondary filter membrane filtration of 200 purpose flame filter presses and 10 μ m then, obtains solid content and be 2.5% green tea extractive liquor 125kg.With the milipore filter of this smart filter tea liquid, obtain the ultrafiltrate of clear through 10 sub-very much interceptions.Then, this liquid enters reverse osmosis membrane to be concentrated into solid content is 15% inspissated juice (I).Inspissated juice I is taken out 1/3 enter vacuum again and concentrate, be concentrated into that to contain the solid content amount be 35% inspissated juice II.After again inspissated juice I and II being mixed 15 minutes in agitator, promptly carry out obtaining instant green tea powder after the spray-drying.Each 0.2 gram of instant green tea powder that obtains is put into two cups, and when adding 80 ℃ of warm water and 20 ℃ of each 100ml of water respectively, instant tea powder is dissolving immediately all.The color of millet paste is all good.
Comparative example 1
Similarly to Example 1, the coarse filtration liquid that obtains is directly entered vacuum concentrate, be concentrated into the inspissated juice that contains solid content weight 35%, carry out spray-drying then, obtain the green tea instant tea powder.The green tea instant tea that obtains is respectively got 0.2 gram put into two cups, add 80 ℃ of hot water and 20 ℃ of each 100ml of water respectively.Add after stirring, can dissolving of hot water, but millet paste is slightly muddy, and the soup look yellowish-brown, the fragrance poorness, flavour is blunt ripe flavor: the sample that adds 20 ℃ of water then has granule to exist, and can not dissolve fully.
Embodiment 2
With 10kg oolong tea, the hot water extracting after 20 minutes that adds 150kg, use the tea extract that obtains clear with same coarse filtration, smart filter, the hyperfiltration process of example 1, be concentrated into (the inspissated juice I) of solid content 10% then with reverse osmosis membrane.Get 1/2 deal of inspissated juice I and carry out (the inspissated juice II) that vacuum is concentrated into solid content 35% again.With carrying out spray-drying after inspissated juice I and the II mixing and stirring, obtain instant oolong tea.Can dissolve immediately in the water that the instant tea powder adding that will arrive is 20-25 ℃, and color is all little with the difference of now making tea.
In sum, adopt the above-mentioned instant tea manufacture method of the present invention, the instant tea powder of making has dissolubility preferably, and the millet paste clear, and fragrant, flavor all keeps better.Be fit to very much directly drink or prepare the beverage of promptly drinking tea after the dilution.

Claims (7)

1. a method for preparing instant tea is characterized in that comprising the steps:
Tealeaves tentatively extracted according to the method for routine obtain coarse filtration liquid; To the extract process ultra-filtration filters of tealeaves, ultrafiltration is concentrated into reverse osmosis membrane through liquid and contains solid content 5-20%, obtains inspissated juice I then; Then the 1/2-2/3 of inspissated juice I is carried out vacuum and be concentrated into and contain solid content 30-35%, obtain inspissated juice II; Then remaining inspissated juice I and inspissated juice II are mixed inspissated juice III; Inspissated juice III is carried out spray-drying or freeze drying, obtain instant tea.
2. the method for preparing instant tea according to claim 1 is characterized in that described tealeaves is selected from a kind of in green tea, black tea, oolong tea or the jasmine tea.
3. the method for preparing instant tea according to claim 1 is characterized in that the milipore filter that uses is polypropylene hollow fiber membrane in described ultrafiltration step, molecular cut off is 70,000-100,000 dalton.
4. prepare the method for instant tea according to claim 1, it is characterized in that tea extract after ultrafiltration, be concentrated into the inspissated juice that solid content is 10-20% with reverse osmosis membrane.
5. the method for preparing instant tea according to claim 1 is characterized in that described vacuum simmer down to adopts 40-45 ℃ cryogenic vacuum to concentrate.
6. as preparing the method for instant tea as described in arbitrary claim among the claim 1-5, it is characterized in that when the solid content that sees through liquid in the process of counter-infiltration reaches 0.2-0.8%, it is reclaimed to join again wait in the tea that concentrates and carry out reverse osmosis concentration again.
7. instant tea of producing according to the described method of arbitrary claim among the claim 1-5.
CNB011160454A 2001-05-11 2001-05-11 Instant tea and its preparing process Expired - Lifetime CN1161028C (en)

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Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1299588C (en) * 2005-05-26 2007-02-14 浙江大学 Quickly dissolving tea powder, and its processing art
US20090202676A1 (en) * 2008-02-07 2009-08-13 Conopco, Inc. D/B/A Unilever Process for manufacturing a tea product
CN101366426B (en) * 2008-09-16 2011-01-05 无锡太阳绿宝科技有限公司 Preparation technique for high-catechin instant green tea powder
CN102125131B (en) * 2010-12-10 2012-12-12 广州市香雪制药股份有限公司 Instant green tea powder and preparation method thereof
CN102293280B (en) * 2011-05-23 2013-07-17 婺源县聚芳永茶业有限公司 Production process of instant green tea
CN102429184B (en) * 2011-11-29 2013-09-18 中国农业大学 Instant asparagus powder and preparation method thereof
CN102835524A (en) * 2012-08-08 2012-12-26 湖州方路茶业有限公司 Preparation method for purple perilla instant tea powder
CN103843925B (en) * 2013-10-18 2016-11-09 西昌正源静洋生物科技有限公司 A kind of health care instant molecular Radix Et Rhizoma Fagopyri Tatarici tea
CN103549070B (en) * 2013-11-04 2015-03-04 无锡太阳绿宝科技有限公司 Preparation method for instant tea powder without pesticide residues
CN103609782A (en) * 2013-11-14 2014-03-05 杨云帆 Process for preparing instant drinks with rich tea polyphenols and process for preparing instant tea powder with rich tea polyphenols
CN105010617B (en) * 2014-04-29 2020-02-11 统一企业(中国)投资有限公司昆山研究开发中心 Instant black tea, ice black tea beverage and preparation method thereof
CN105248769A (en) * 2015-11-06 2016-01-20 婺源县聚芳永茶业有限公司 Method for preparing Rooibos instant powder
CN108295660A (en) * 2018-04-23 2018-07-20 上海飞态环保科技有限公司 A kind of heat-sensitive substance concentration systems and its method
CN108782881A (en) * 2018-06-26 2018-11-13 健士星生物技术研发(上海)有限公司 A kind of preparation method of the cold soluble instant tea of whole process low temperature extraction
CN110755863A (en) * 2019-11-25 2020-02-07 湖南安化芙蓉山茶业有限责任公司 Energy-saving type low-concentration liquid vacuum concentration system and application thereof in tea juice concentration
CN111317046A (en) * 2020-04-15 2020-06-23 西安艾默农林生物技术有限公司 Preparation method of instant samara tea
CN112616966A (en) * 2021-02-01 2021-04-09 湖南安化芙蓉山茶业有限责任公司 Preparation method of strong-flavor instant tea and product thereof
CN114568563A (en) * 2022-02-22 2022-06-03 山西振东五和医养堂股份有限公司 Instant tea rich in aroma components and preparation method thereof

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