Background technology
China is product tea the biggest in the world state, and more than 300 ten thousand hectares in tea place is arranged approximately, and only just there is more than 110,000 hectare in tea place in Anhui Province.The tea grower only plucks some tender fresh leaves of tea plant at present, and a large amount of thick Lao Ye stay on the tea tree, cause the tea resource wasting phenomenon.Analysis and research show that these coarse teas are set bright leaf, contain functional nutrient health substances such as a large amount of Tea Polyphenols, amino acid, caffeine, vitamin, can be by extensive utilization.
There are a large amount of wild indocalamus leaf resources in China in addition, and only Wannan mountainous area just has more than 1,000,000 mu of wild indocalamus leaf to distribute approximately, and these indocalamus leaves are only plucked sub-fraction as rice-pudding leaf bag pyramid-shaped dumpling, and the overwhelming majority all is grown on the mountain runs its course.
Goal of the invention
Technical problem to be solved by this invention provides a kind of drink and production process that utilizes the thick old bright leaf of tea tree, wild indocalamus leaf for raw material.
Technical scheme of the present invention is following: a kind of preparation technology of composite instant tea may further comprise the steps successively: just filter operation, carbohydrase saccharification operation, duplex are filtered operation, pottery film ultrafiltration operation, dextrin enrichment operation, high-temperature sterilization operation, vacuum spray drying operation, vacuum-packed operation again to pluck operation, cold storing and fresh-keeping operation, pulverizing process, lixiviate operation, merging squeezing process, enzyme extraction process, deposition
(1) plucks operation: the thick old bright leaf of the tea tree of harvesting, fresh indocalamus leaf.
(2) cold storing and fresh-keeping operation: the fresh leaves of tea plant that will adopt and bright indocalamus leaf are put into freezer and are carried out cold storing and fresh-keeping, and refrigerated storage temperature 3-5 ℃, wherein the refrigerated storage temperature in spring is 4-5 ℃, 3-4 ℃ of summer, autumns.The purpose of cold storing and fresh-keeping is that the maintenance freshness is prevented and treated oxidation, stops fermentation rotten.
(3) pulverizing process: the tealeaves and the indocalamus leaf that will refrigerate after 3-4 hours drop into the pulverizer pulverizing, and pulverizing length is the smalls section of 1-1.5cm.
(4) lixiviate operation: the tealeaves after will pulverizing and respectively the indocalamus leaf carry out lixiviate:
Tealeaves divides second extraction:
For the first time: with the tealeaves that crushes, add the vitamin(e) C sodium of the 0.5-0.6% of its weight, put into hot water again; Extract 90-95 ℃ of temperature, 30-40 minutes time, material-water ratio 1:20; Filter, obtain tealeaves filtrating and the tealeaves filter residue, the hot dipping of primary tealeaves is carried; Can stop polyphenol oxidase oxydasis in the tealeaves, in case " red stain ";
Extract for the second time: the tealeaves filter residue is added the vitamin(e) C sodium of the 0.2-0.3% of tealeaves weight, put into hot water again, extraction temperature is 80-85 ℃, 20-30 minutes time, material-water ratio 1:10; Filter, merge the filtrating of 2 extractions, obtain tea extract; This time extract and be to prevent that generation " hot vexed flavor " from influencing quality.
The extraction of indocalamus leaf:
With the indocalamus leaf that crushes, put into hot water earlier, add 0.3% vitamin(e) C sodium of indocalamus leaf weight again, 85-95 ℃ of the extraction temperature of indocalamus leaf, 60-80 minutes time, material-water ratio 1:25 (promptly 1 kilogram of indocalamus leaf adds 25 kg of water) filters, and obtains the indocalamus leaf extract.This time extract and to improve amino acid in the indocalamus leaf, flavonoid substance leaching rate.
(5) merge squeezing process: with tea extract and indocalamus leaf extract; 70% tea liquid merges with 30% indocalamus liquid and imports squeezer and carry out twice pressing by volume, obtains mixing pressed liquor, when squeezing 15-20 minutes at every turn; Take hot pressing to press, temperature remains on 45-55 ℃.
(6) enzyme extraction process: in mixing pressed liquor, add the cellulase extraction, obtain the enzyme extract, the cellulase addition is the 0.5-0.6% of pressed liquor weight, 40-46 ℃ of extraction temperature, and the extraction time is not less than 1 hour.
(7) the first filter operation of deposition: with the enzyme extract at room temperature natural sedimentation be not less than 2 hours, carry out filter just with 400 order stainless steel filtering nets again, obtain just filtrating.
(8) carbohydrase saccharification operation: will just filtrate and carry out saccharification react, and obtain saccharification liquid, the carbohydrase addition is the 0.1-0.2% of first filtrating weight, 40-45 ℃ of saccharification temperatures, 35-40 minutes time.The saccharification react purpose is the saccharification through carbohydrase, further increases polysaccharose substance content in the feed liquid, improves sweet and tasty degree, reduces bitter taste.
(9) duplex is filtered operation again: the juice behind the saccharification react is carried out the duplex separating and filtering, obtain multiple filtrating, and the first 800 orders, second 1000 order, pressure is at 0.1-0.15Mpa.Multiple filter is to make some impurity in the juice, fibre object, and macromolecular substances fully separates, to keep extracting the juice degree of purity.
(10) pottery film ultrafiltration operation: will filtrate again and carry out ultrafiltration through the ceramic membrane ultrafitration machine again, the aperture of ceramic membrane is 0.01um, and pressure 0.2-0.3Mpa obtains ultrafiltrate.Through the instant tea after the ultrafiltration, limpid pure after brewing, there is not any sediment.
(11) dextrin enrichment operation: in ultrafiltrate, add the dextrin of its weight 5-10%, mix, obtain enrichment juice; Because through the juice of ultra filtration, concentration is rarer, must use dextrin increases concentration; Its effect has 2 points: the first, increase sap concentration, and be easy to spray-drying.The second, extract is behind saccharification react, and viscosity is higher, and dextrin can be reconciled viscosity, is convenient to the moulding of dusting.
(12) high-temperature sterilization operation: enrichment juice is sterilized, obtain the juice of sterilizing, 105-121 ℃ of sterilising temps, owing to through above-mentioned several procedures, can produce secondary pollution and must adopt ultra high temperature short time sterilization, guarantee that microorganism does not exceed standard at 15-20 seconds time
(13) vacuum spray drying operation: the juice of will sterilizing carries out the spray dryer drying, 50-55 ℃ of temperature of charge, and atomisation pressure 0.1-0.12Mpa makes powder water content≤5%.
(14) vacuum-packed operation: the powdery instant tea after the spray-drying, carry out the aseptic packaging of aluminium type complex pocket with the asepsis vacuum packing machine, this moment, the instant tea water content was 5-5.5%, vacuum packaging can guarantee that water content is stable, does not receive to pollute once more.Usually vacuum packaging bag sack 20kg/ wraps, pouch 5kg/ bag, its 12 months product room temperature storage shelf-lifves.
Beneficial effect of the present invention:
1. the raw materials for production cost is low
Used raw materials for production are thick old bright leaf of tea tree and wild indocalamus leaf, and it is with low cost, and wide material sources have been realized turning waste into wealth, and make full use of tealeaves and indocalamus leaf characteristics of resources.
2. extraction yield is high
In extraction process, adopted the enzyme extraction process, added cellulase, the cellulose in tealeaves and the indocalamus leaf is degraded, improved extraction yield.Through detecting, can improve recovery rate about 10% usually.
3. saccharification react improves mouthfeel: in extraction process, increase the carbohydrase saccharification react, polysaccharose substance is transformed be decomposed into monose, help alleviating bitter taste, improve sweet and tasty degree, improve mouthfeel, optimize quality.
4. superior in quality: the composite instant tea of production and processing of the present invention, it is Powdered that profile is, and color and luster is greenish-yellow, and flavour is pure and sweet tasty and refreshing, is soluble in hot and cold water, and limpid bright.Main physical and chemical index is: moisture≤5.5%, Tea Polyphenols>=25.5%, caffeine>=2.5%, amino acid>=3.5%, vitamin>=0.25%; Flavonoids>=0.18%.When drinking, not only present the excellent green tea quality and flavor, and have a little leaf of bamboo delicate fragrance, its color is all good.
5. product purpose is extensive: the composite instant tea of production and processing of the present invention, and both can directly brew and drink, also can be used as beverage, cold tea, milk tea, health protection tea major ingredient, also can be used as the auxiliary material of daily products such as cosmetics, toothpaste, washing agent, its purposes is very extensively.
The specific embodiment
Below in conjunction with embodiment the present invention is done detailed explanation
Cellulase of the present invention, carbohydrase are produced by Shandong Anke Bioengineering Co., Ltd..
Embodiment 1:
(1) plucks operation: pluck the thick old bright leaf of tea tree in 3-4 month in spring, fresh indocalamus leaf.
(2) cold storing and fresh-keeping operation: the fresh leaves of tea plant that will adopt and bright leaf indocalamus leaf are put into freezer and are carried out cold storing and fresh-keeping, and refrigerated storage temperature is 4-5 ℃.The purpose of cold storing and fresh-keeping is that the maintenance freshness is prevented and treated oxidation, stops fermentation rotten.
(3) pulverizing process: the tealeaves and the indocalamus leaf that will refrigerate after 3-4 hours drop into the pulverizer pulverizing, and pulverizing length is the smalls section of 1-1.5cm.
(4) lixiviate operation: the tealeaves after will pulverizing and respectively the indocalamus leaf carry out lixiviate:
Tealeaves divides second extraction:
For the first time: with the tealeaves that crushes, add 0.6% vitamin(e) C sodium of tealeaves weight, put into hot water again; Extract 90-95 ℃ of temperature, 30-40 minutes time, material-water ratio 1:20; Filter, obtain tealeaves filtrating and the tealeaves filter residue, the hot dipping of primary tealeaves is carried; Can stop polyphenol oxidase oxydasis in the tealeaves, in case " red stain ";
Extract for the second time: the tealeaves filter residue is added 0.2% vitamin(e) C sodium of its weight, put into hot water again, extraction temperature is 80-85 ℃, 20-30 minutes time, material-water ratio 1:10; Filter, merge the filtrating of 2 extractions, obtain tea extract; This time extract and be to prevent that generation " hot vexed flavor " from influencing quality.
The extraction of indocalamus leaf:
With the indocalamus leaf that crushes, put into hot water earlier, add 0.3% vitamin(e) C sodium of indocalamus leaf weight again, 85-95 ℃ of the extraction temperature of indocalamus leaf, 60-80 minutes time, material-water ratio 1:25 (promptly 1 kilogram of indocalamus leaf adds 25 kg of water) filters, and obtains the indocalamus leaf extract.This time extract and to improve amino acid in the indocalamus leaf, flavonoid substance leaching rate.
(5) merge squeezing process: with tea extract and indocalamus leaf extract; 70% tea liquid merges with 30% indocalamus liquid and imports squeezer and carry out twice pressing by volume, obtains mixing pressed liquor, when squeezing 15-20 minutes at every turn; Take hot pressing to press, temperature remains on 45-55 ℃.
(6) enzyme extraction process: in mixing pressed liquor, add the cellulase extraction, obtain the enzyme extract, the cellulase addition is 0.5% of a pressed liquor weight, 42-46 ℃ of extraction temperature, and the extraction time is 1 hour.
(7) the first filter operation of deposition: with the natural sedimentation 2 hours at room temperature of enzyme extract, carry out filter just with 400 order stainless steel filtering nets again, obtain just filtrating.
(8) carbohydrase saccharification operation: will just filtrate and carry out saccharification react, and obtain saccharification liquid, the carbohydrase addition is 0.1% of the weight of just filtrating, 40-45 ℃ of saccharification temperatures, 35-40 minutes time.The saccharification react purpose is the saccharification through carbohydrase, further increases polysaccharose substance content in the feed liquid, improves sweet and tasty degree, reduces bitter taste.
(9) duplex is filtered operation again: the juice behind the saccharification react is carried out the duplex separating and filtering, obtain multiple filtrating, and the first 800 orders, second 1000 order, pressure is at 0.1-0.15Mpa.Multiple filter is to make some impurity in the juice, fibre object, and macromolecular substances fully separates, to keep extracting the juice degree of purity.
(10) pottery film ultrafiltration operation: will filtrate again and carry out ultrafiltration through the ceramic membrane ultrafitration machine again, the aperture of ceramic membrane is 0.01um, and pressure 0.2-0.3Mpa obtains ultrafiltrate.Through the instant tea after the ultrafiltration, limpid pure after brewing, there is not any sediment.
(11) dextrin enrichment operation: in ultrafiltrate, add the dextrin of its weight 5%, mix, obtain enrichment juice; Because through the juice of ultra filtration, concentration is rarer, must use dextrin increases concentration; Its effect has 2 points: the first, increase sap concentration, and be easy to spray-drying.The second, extract is behind saccharification react, and viscosity is higher, and dextrin can be reconciled viscosity, is convenient to the moulding of dusting.
(12) high-temperature sterilization operation: enrichment juice is sterilized, obtain the juice of sterilizing, 105-121 ℃ of sterilising temps, owing to through above-mentioned several procedures, can produce secondary pollution and must adopt ultra high temperature short time sterilization, guarantee that microorganism does not exceed standard at 15-20 seconds time
(13) vacuum spray drying operation: the juice of will sterilizing carries out the spray dryer drying, 50-55 ℃ of temperature of charge, and atomisation pressure 0.1-0.12Mpa makes powder water content≤5%.
(14) vacuum-packed operation: the powdery instant tea after the spray-drying, carry out the aseptic packaging of aluminium type complex pocket with the asepsis vacuum packing machine, this moment, the instant tea water content was 5-5.5%, vacuum packaging can guarantee that water content is stable, does not receive to pollute once more.Usually vacuum packaging bag sack 20kg/ wraps, pouch 5kg/ bag, its 12 months product room temperature storage shelf-lifves.
Embodiment 2:
(1) plucks operation: pluck the thick old bright leaf of tea tree in 5-6 month in summer, fresh indocalamus leaf.
(2) cold storing and fresh-keeping operation: the fresh leaves of tea plant that will adopt and bright leaf indocalamus leaf are put into freezer and are carried out cold storing and fresh-keeping, refrigerated storage temperature 3-5 ℃.The purpose of cold storing and fresh-keeping is that the maintenance freshness is prevented and treated oxidation, stops fermentation rotten.
(3) pulverizing process: the tealeaves and the indocalamus leaf that will refrigerate after 3-4 hours drop into the pulverizer pulverizing respectively, and pulverizing length is the smalls section of 1-1.5cm.
(4) lixiviate operation: the tealeaves after will pulverizing and respectively the indocalamus leaf carry out lixiviate:
Tealeaves divides second extraction:
For the first time: with the tealeaves that crushes, add 0.5% vitamin(e) C sodium of tealeaves weight, put into hot water again; Extract 90-95 ℃ of temperature, 30-40 minutes time, material-water ratio 1:20; Filter, obtain tealeaves filtrating and the tealeaves filter residue, the hot dipping of primary tealeaves is carried; Can stop polyphenol oxidase oxydasis in the tealeaves, in case " red stain ";
Extract for the second time: the tealeaves filter residue is added 0.3% vitamin(e) C sodium of its weight, put into hot water again, extraction temperature is 80-85 ℃, 20-30 minutes time, material-water ratio 1:10; Filter, merge the filtrating of 2 extractions, obtain tea extract; This time extract and be to prevent that generation " hot vexed flavor " from influencing quality.
The extraction of indocalamus leaf:
With the indocalamus leaf that crushes, put into hot water earlier, add 0.3% vitamin(e) C sodium of indocalamus leaf weight again, 85-95 ℃ of the extraction temperature of indocalamus leaf, 60-80 minutes time, material-water ratio 1:25 (promptly 1 kilogram of indocalamus leaf adds 25 kg of water) filters, and obtains the indocalamus leaf extract.This time can improve amino acid in the indocalamus leaf, flavonoid substance leaching rate.
(5) merge squeezing process: with tea extract and indocalamus leaf extract; 70% tea liquid merges with 30% indocalamus liquid and imports squeezer and carry out twice pressing by volume, obtains mixing pressed liquor, when squeezing 15-20 minutes at every turn; Take hot pressing to press, temperature remains on 45-55 ℃.
(6) enzyme extraction process: in mixing pressed liquor, add the cellulase extraction, obtain the enzyme extract, the cellulase addition is 0.6% of a pressed liquor weight, 40-45 ℃ of extraction temperature, and the extraction time is 1 hour.
(7) the first filter operation of deposition: with the natural sedimentation 2 hours at room temperature of enzyme extract, carry out filter just with 400 order stainless steel filtering nets again, obtain just filtrating.
(8) carbohydrase saccharification operation: will just filtrate and carry out saccharification react, and obtain saccharification liquid, the carbohydrase addition is 0.15% of the weight of just filtrating, 40-45 ℃ of saccharification temperatures, 35-40 minutes time.The saccharification react purpose is the saccharification through carbohydrase, further increases polysaccharose substance content in the feed liquid, improves sweet and tasty degree, reduces bitter taste.
(9) duplex is filtered operation again: the juice behind the saccharification react is carried out the duplex separating and filtering, obtain multiple filtrating, and the first 800 orders, second 1000 order, pressure is at 0.1-0.15Mpa.Multiple filter is to make some impurity in the juice, fibre object, and macromolecular substances fully separates, to keep extracting the juice degree of purity.
(10) pottery film ultrafiltration operation: will filtrate again and carry out ultrafiltration through the ceramic membrane ultrafitration machine again, the aperture of ceramic membrane is 0.01um, and pressure 0.2-0.3Mpa obtains ultrafiltrate.Through the instant tea after the ultrafiltration, limpid pure after brewing, there is not any sediment.
(11) dextrin enrichment operation: in ultrafiltrate, add the dextrin of its weight 8%, mix, obtain enrichment juice, owing to the juice through ultra filtration, concentration is rarer, and must use dextrin increases concentration.
(12) high-temperature sterilization operation: enrichment juice is sterilized, obtain the juice of sterilizing, 105-121 ℃ of sterilising temps, owing to through above-mentioned several procedures, can produce secondary pollution and must adopt ultra high temperature short time sterilization, guarantee that microorganism does not exceed standard at 15-20 seconds time
(13) vacuum spray drying operation: the juice of will sterilizing carries out the spray dryer drying, 50-55 ℃ of temperature of charge, and atomisation pressure 0.1-0.12Mpa makes powder water content≤5%.
(14) vacuum-packed operation: the powdery instant tea after the spray-drying, carry out the aseptic packaging of aluminium type complex pocket with the asepsis vacuum packing machine, this moment, the instant tea water content was 5-5.5%, vacuum packaging can guarantee that water content is stable, does not receive to pollute once more.Usually vacuum packaging bag sack 20kg/ wraps, pouch 5kg/ bag, its 12 months product room temperature storage shelf-lifves.
Embodiment 3:
(1) plucks operation: pluck the thick old bright leaf of tea tree in 9-10 month in autumn, fresh indocalamus leaf.
(2) cold storing and fresh-keeping operation: the fresh leaves of tea plant that will adopt and bright leaf indocalamus leaf are put into freezer and are carried out cold storing and fresh-keeping, 3-4 ℃ of refrigerated storage temperatures.The purpose of cold storing and fresh-keeping is that the maintenance freshness is prevented and treated oxidation, stops fermentation rotten.
(3) pulverizing process: the tealeaves and the indocalamus leaf that will refrigerate after 3-4 hours drop into the pulverizer pulverizing respectively, and pulverizing length is the smalls section of 1-1.5cm.
(4) lixiviate operation: the tealeaves after will pulverizing and respectively the indocalamus leaf carry out lixiviate:
Tealeaves divides second extraction:
For the first time: with the tealeaves that crushes, add 0.6% vitamin(e) C sodium of tealeaves weight, put into hot water again; Extract 90-95 ℃ of temperature, 30-40 minutes time, material-water ratio 1:20; Filter, obtain tealeaves filtrating and the tealeaves filter residue, the hot dipping of primary tealeaves is carried; Can stop polyphenol oxidase oxydasis in the tealeaves, in case " red stain ";
Extract for the second time: the tealeaves filter residue is added 0.2% vitamin(e) C sodium of tealeaves weight, put into hot water again, extraction temperature is 80-85 ℃, 20-30 minutes time, material-water ratio 1:10; Filter, merge the filtrating of 2 extractions, obtain tea extract; This time extract and be to prevent that generation " hot vexed flavor " from influencing quality.
The extraction of indocalamus leaf:
With the indocalamus leaf that crushes, put into hot water earlier, add 0.3% vitamin(e) C sodium of indocalamus leaf weight again, 85-95 ℃ of the extraction temperature of indocalamus leaf, 60-80 minutes time, material-water ratio 1:25 (promptly 1 kilogram of indocalamus leaf adds 25 kg of water) filters, and obtains the indocalamus leaf extract.This time improve and to improve amino acid in the indocalamus leaf, flavonoid substance leaching rate.
(5) merge squeezing process: with tea extract and indocalamus leaf extract; 70% tea liquid merges with 30% indocalamus liquid and imports squeezer and carry out twice pressing by volume, obtains mixing pressed liquor, when squeezing 15-20 minutes at every turn; Take hot pressing to press, temperature remains on 45-55 ℃.
(6) enzyme extraction process: in mixing pressed liquor, add cellulase and extract, obtain the enzyme extract, the cellulase addition is 0.6% of a pressed liquor weight, 40-46 ℃ of extraction temperature, and the extraction time is 1 hour.
(7) the first filter operation of deposition: with the natural sedimentation 2 hours at room temperature of enzyme extract, carry out filter just with 400 order stainless steel filtering nets again, obtain just filtrating.
(8) carbohydrase saccharification operation: will just filtrate and carry out saccharification react, and obtain saccharification liquid, the carbohydrase addition is 0.2% of the weight of just filtrating, 40-45 ℃ of saccharification temperatures, 35-40 minutes time.The saccharification react purpose is the saccharification through carbohydrase, further increases polysaccharose substance content in the feed liquid, improves sweet and tasty degree, reduces bitter taste.
(9) duplex is filtered operation again: the juice behind the saccharification react is carried out the duplex separating and filtering, obtain multiple filtrating, and the first 800 orders, second 1000 order, pressure is at 0.1-0.15pma.Multiple filter is to make some impurity in the juice, fibre object, and macromolecular substances fully separates, to keep extracting the juice degree of purity.
(10) pottery film ultrafiltration operation: will filtrate again and carry out ultrafiltration through the ceramic membrane ultrafitration machine again, the aperture of ceramic membrane is 0.01um, and pressure 0.2-0.3Mpa obtains ultrafiltrate.Through the instant tea after the ultrafiltration, limpid pure after brewing, there is not any sediment.
(11) dextrin enrichment operation: in ultrafiltrate, add the dextrin of its weight 10%, mix, obtain enrichment juice; Because through the juice of ultra filtration, concentration is rarer, must use dextrin increases concentration; Its effect has 2 points: the first, increase sap concentration, and be easy to spray-drying.The second, extract is behind saccharification react, and viscosity is higher, and dextrin can be reconciled viscosity, is convenient to the moulding of dusting.
(12) high-temperature sterilization operation: enrichment juice is sterilized, obtain the juice of sterilizing, 105-121 ℃ of sterilising temps, owing to through above-mentioned several procedures, can produce secondary pollution and must adopt ultra high temperature short time sterilization, guarantee that microorganism does not exceed standard at 15-20 seconds time
(13) vacuum spray drying operation: the juice of will sterilizing carries out the spray dryer drying, 50-55 ℃ of temperature of charge, and atomisation pressure 0.1-0.12Mpa makes powder water content≤5%.
(14) vacuum-packed operation: the powdery instant tea after the spray-drying, carry out the aseptic packaging of aluminium type complex pocket with the asepsis vacuum packing machine, this moment, the instant tea water content was 5-5.5%, vacuum packaging can guarantee that water content is stable, does not receive to pollute once more.Usually vacuum packaging bag sack 20kg/ wraps, pouch 5kg/ bag, its 12 months product room temperature storage shelf-lifves.
Embodiment 4:
The composite instant tea Quality Detection of embodiment 1,2,3 mades is following:
Table 1 composite instant tea profile, endoplasm qualitative characteristics
|
Quality and quality performance |
Profile |
Green-yellow is Powdered to yellow green, does not have caking |
Fragrance |
Have the pure fragrance of green tea, slightly contain leaf of bamboo delicate fragrance |
Flavour |
Mellow sweet and tasty, no bitter taste |
The soup look |
Yellow green, limpid bright, deposit-free |
Dissolubility |
Be dissolved in hot water fast, also be dissolved in cold water |
Table 2 composite instant tea physical and chemical quality characteristic
The main health quality of table 3 composite instant tea situation
Project |
Index |
Copper mg/kg |
4.5-5 |
Plumbous mg/kg |
15-20 |
Arsenic mg/kg |
0.1-0.2 |
Mercury mg/kg |
0.1-0.2 |
Rare earth mg/kg |
1.5-2.0 |
Mould and yeast cfu/ml |
≤100 |
Coliform MPN/100ml |
≤50 |
Pathogenic bacteria |
Must not detect |
In sum, by the composite instant tea that above-mentioned processes is made, no matter be outward appearance, endoplasm, still main physical and chemical index all reaches high-grade high-quality instant tea standard, can be applicable.