CN111685212A - Instant selenium-rich herbaceous coffee and preparation method thereof - Google Patents
Instant selenium-rich herbaceous coffee and preparation method thereof Download PDFInfo
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- CN111685212A CN111685212A CN201910186293.XA CN201910186293A CN111685212A CN 111685212 A CN111685212 A CN 111685212A CN 201910186293 A CN201910186293 A CN 201910186293A CN 111685212 A CN111685212 A CN 111685212A
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- 235000013353 coffee beverage Nutrition 0.000 title claims abstract description 62
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 239000011669 selenium Substances 0.000 title claims abstract description 59
- 229910052711 selenium Inorganic materials 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 241000533293 Sesbania emerus Species 0.000 claims abstract description 115
- 238000000605 extraction Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000001694 spray drying Methods 0.000 claims abstract description 18
- 235000015112 vegetable and seed oil Nutrition 0.000 claims abstract description 11
- 239000008158 vegetable oil Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 238000001035 drying Methods 0.000 claims description 21
- 239000002904 solvent Substances 0.000 claims description 18
- 244000046052 Phaseolus vulgaris Species 0.000 claims description 15
- 235000010627 Phaseolus vulgaris Nutrition 0.000 claims description 15
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- 239000007787 solid Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 8
- 239000008213 purified water Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
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- 238000004140 cleaning Methods 0.000 claims description 4
- 235000003145 Hippophae rhamnoides Nutrition 0.000 claims description 3
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- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000000944 linseed oil Substances 0.000 claims description 3
- 235000021388 linseed oil Nutrition 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
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- 238000010438 heat treatment Methods 0.000 abstract description 12
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- 125000003118 aryl group Chemical group 0.000 abstract description 6
- 239000003205 fragrance Substances 0.000 abstract description 6
- 235000013305 food Nutrition 0.000 abstract description 5
- 239000008187 granular material Substances 0.000 abstract description 4
- 235000021539 instant coffee Nutrition 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 241000229143 Hippophae Species 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 210000004400 mucous membrane Anatomy 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 150000001413 amino acids Chemical class 0.000 description 2
- RYYVLZVUVIJVGH-UHFFFAOYSA-N caffeine Chemical compound CN1C(=O)N(C)C(=O)C2=C1N=CN2C RYYVLZVUVIJVGH-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
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- 206010013911 Dysgeusia Diseases 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000003935 Hippophae Nutrition 0.000 description 1
- LPHGQDQBBGAPDZ-UHFFFAOYSA-N Isocaffeine Natural products CN1C(=O)N(C)C(=O)C2=C1N(C)C=N2 LPHGQDQBBGAPDZ-UHFFFAOYSA-N 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
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- VJEONQKOZGKCAK-UHFFFAOYSA-N caffeine Natural products CN1C(=O)N(C)C(=O)C2=C1C=CN2C VJEONQKOZGKCAK-UHFFFAOYSA-N 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F5/00—Coffee; Coffee substitutes; Preparations thereof
- A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
- A23F5/26—Extraction of water-soluble constituents
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F5/00—Coffee; Coffee substitutes; Preparations thereof
- A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
- A23F5/28—Drying or concentrating coffee extract
- A23F5/34—Drying or concentrating coffee extract by spraying into a gas stream
Abstract
The invention is applicable to the technical field of food processing, and provides instant selenium-rich herbaceous coffee and a preparation method thereof. The invention uses the mode of sectional heating to roast the coffee beans, and adds the wild vegetable oil in the third stage, so that the color, the fragrance and the taste of the coffee beans achieve the best effect. Extracting water-soluble components from the coffee beans at a certain temperature and pressure, and controlling the extraction rate to make the extracted coffee have optimal taste. Vacuum concentration of the extract at low temperature prevents loss of aroma and selenium from the coffee. The spray drying method can prepare instant coffee granules on the premise of keeping aromatic substances in the coffee to the maximum extent, and is convenient to drink.
Description
Technical Field
The invention belongs to the technical field of food processing, and particularly relates to instant selenium-rich herbaceous coffee and a preparation method thereof.
Background
Coffee is the first of three major beverages in the world, is one of international important trade commodities, is an important raw material of medical food and light chemical industry, has only been woody coffee in the world since history, is mainly produced in a few countries near the equator, such as Columbia, Brazil, Indonesia and the like, has a small amount of woody coffee planted in subtropical regions, such as Hainan, Yunnan and the like, and is not produced in most countries, the raw material is in short supply and the price is expensive. The quantity of coffee consumed in the world is more than 1600 million tons, the quantity of coffee consumed in China is about 30 million tons, more than 90% of the quantity of coffee consumed in China depends on import, a large amount of foreign exchange is consumed every year, and the quantity of coffee consumed in China and the world is gradually increased year by year along with the improvement of living standard of people, the change of consumption structures and the development of tourism industry.
The herbaceous coffee is completely comparable with woody coffee and has obvious advantages. The strict test and detection of more than ten authoritative departments such as the Chinese agriculture department, the science and technology department, the original light industry department, the health department, the national trade department, the national food quality supervision and detection center and the like prove that the herbaceous coffee has the components, color, fragrance and taste of the woody coffee, and the contents of fat, starch and the like are similar to those of the woody coffee: the most needed multiple trace elements of human bodies such as protein, amino acid, iron, zinc, calcium, selenium and the like are higher than those of woody coffee, the caffeine content of the herbaceous coffee is moderate, the herbaceous coffee just accords with the human body requirement standard and the international food sanitation index, the toxicity test proves that the herbaceous coffee product is nontoxic and has no risk of causing three factors, the product processing has no color body damage, the sanitation index accords with the national standard, and the product quality reaches the enterprise standard. The herbal coffee has effects of promoting urination, promoting defecation, improving eyesight, protecting liver, tonifying heart, protecting kidney, reducing blood lipid, resisting cancer, reducing weight, refreshing brain, increasing memory and resisting aging, and is nutritious and a new resource of health food.
Due to the restriction of the preparation process of the existing herbal coffee, selenium in the herbal coffee is easy to lose in the preparation process, so that the content of the selenium is reduced.
Disclosure of Invention
The embodiment of the invention provides instant selenium-rich herbaceous coffee and a preparation method thereof, aiming at solving the problem that selenium element in the herbaceous coffee is easy to lose in the preparation process.
The embodiment of the invention is realized by the selenium-rich herbaceous coffee beans, wherein the coffee beans contain selenium, and the content of the selenium in the coffee beans is more than 70 mu g/100 g.
The embodiment of the invention also provides a preparation method of instant selenium-rich herbaceous coffee, which adopts the selenium-rich herbaceous coffee beans as raw materials and comprises the following steps:
removing impurities, broken beans, shrunken grains and mildewed beans in the coffee beans, cleaning the coffee beans with purified water, and drying for later use;
sequentially roasting the dried coffee beans at 150 ℃ in a first stage to increase the temperature to 200 ℃, roasting at 200 ℃ in a second stage to decrease the temperature to 135 ℃, roasting at 135 ℃ in a third stage to increase the temperature to 170 ℃, and adding wild vegetable oil in the third stage;
grinding the roasted coffee beans to powder with a particle size of 0.45-1.25 mm;
adding the ground coffee beans into an extraction solvent, extracting under certain pressure and temperature until the weight of solid matters in the extraction solvent is 67-77% of the weight of the ground coffee beans, and extracting an extract;
vacuum concentrating the extractive solution at-45-55 deg.C to obtain 38-40% concentrated solution;
and drying the concentrated solution by adopting a spray drying method to obtain the solid granular selenium-rich herbaceous coffee.
Further, washing the coffee beans with purified water and drying the coffee beans for use includes:
standing in water for 18-36 hr to ferment;
flushing the fermented coffee beans by using running water until the surfaces of the coffee beans are smooth and clean;
spreading the washed coffee beans, and drying in natural light for 10-20 days to make the water content of the coffee beans less than 12% and the drying temperature of 22-28 deg.C.
Furthermore, the temperature rising rate of the first stage is 5-7 ℃/min, the temperature reduction rate of the second stage is 15-19 ℃/min, and the temperature rising rate of the third stage is 8-10 ℃/min.
Further, the wild vegetable oil is one of tea oil, sea buckthorn oil and linseed oil.
Further, the roasted coffee beans are ground into a powder having a particle size of 0.6 to 0.8 mm.
Furthermore, the extraction pressure is 1.8-2Mpa, the temperature is 85-90 ℃, and the weight ratio of the ground coffee beans to the extraction solvent is 1 (11-15).
Further, the vacuum concentration pressure is 82.7-90.6 Kpa.
Further, the hot air temperature of the spray drying method is 110-120 ℃.
The embodiment of the invention also provides instant selenium-rich herbaceous coffee which is prepared by adopting the preparation method.
According to the instant selenium-rich herbaceous coffee and the preparation method thereof, coffee beans are roasted by a sectional heating mode, and wild vegetable oil is added in the third stage, so that the best effect of the color, the fragrance and the taste of the coffee beans is achieved. Extracting water-soluble components from the coffee beans at a certain temperature and pressure, and controlling the extraction rate to make the extracted coffee have optimal taste. Vacuum concentration of the extract at low temperature prevents loss of aroma and selenium from the coffee. The spray drying method can prepare instant coffee granules on the premise of keeping aromatic substances in the coffee to the maximum extent, and is convenient to drink.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides instant selenium-rich herbaceous coffee and a preparation method thereof, wherein selenium-rich herbaceous coffee beans are used as raw materials, and are annual shrub-like leguminous plants (Rutaceae), so that the instant selenium-rich herbaceous coffee has strong vitality, can resist high temperature of 50 ℃, low temperature of 3-5 ℃ and soil and drought resistance. On the basis of selecting 'selenium-containing soil + biological selenium conversion method', the selenium-rich herbaceous coffee beans are planted by applying the modern scientific technology, and the content of protein, amino acid, iron, zinc, calcium, selenium and other trace elements needed by human bodies is high, wherein the content of selenium is more than 70 mu g/100g and is higher than that of the selenium in the existing coffee beans of other varieties.
The preparation method of the instant selenium-rich herbaceous coffee provided by the embodiment of the invention comprises the following steps:
removing impurities, broken beans, shrunken grains and mildewed beans in the coffee beans, washing the coffee beans with purified water, and drying for later use.
The collected raw selenium-rich herbaceous coffee beans contain some broken beans, shrunken beans and mildewed beans, and possibly foreign matters such as stone particles and dust can be mixed, the coffee beans and the foreign matters need to be removed, and optionally, the coffee beans are winnowed by an electric windmill, so that the cleaning effect is good.
After screening, washing the coffee beans for later use, optionally, in order to improve the quality of the coffee beans, washing the coffee beans with purified water and then drying the coffee beans for later use comprises:
standing in water for 18-36 hr to ferment.
The surface of the coffee bean has a layer of mucous membrane which has strong adhesive force and is not easy to remove, and the coffee bean is soaked in a water tank for 18-36h to ferment and decompose the mucous membrane.
After the mucous membrane is decomposed, the fermented coffee beans are washed by using running water until the surfaces of the coffee beans are smooth and clean.
Spreading the washed coffee beans, and drying in natural light for 10-20 days to make the water content of the coffee beans less than 12% and the drying temperature of 22-28 deg.C.
The coffee beans after being washed by the live water have high water content which is about 50 percent, and the coffee beans with high water content are easy to mildew and rot, so the coffee beans need to be dried.
Sequentially roasting the dried coffee beans at 150 deg.C in the first stage to 200 deg.C, roasting at 200 deg.C in the second stage to 135 deg.C, roasting at 135 deg.C in the third stage to 170 deg.C, and adding wild vegetable oil in the third stage.
The dried coffee beans are roasted at three sections of variable temperatures, and the special aromatic substances of the coffee beans are formed in the roasting process. Firstly, preheating a device for roasting coffee beans to 150 ℃, completely evaporating and removing water in the device, then adding the coffee beans, rapidly turning the coffee beans in the first stage and heating to 200 ℃, in the process, roasting all the raw coffee beans to be half-cooked, then stopping heating in the second stage, keeping the turning state, roasting by using the residual temperature until the temperature is reduced to 135 ℃, finally, adding the wild vegetable oil in the third stage, heating again and roasting to 170 ℃, and completely infiltrating the surface of the coffee beans with the wild vegetable oil, so that the color, the fragrance and the taste of the coffee beans achieve the best effect.
In order to further ensure the roasting effect, the temperature rising rate of the first stage roasting can be selected to be 5-7 ℃/min, the temperature rising rate of the second stage roasting can be selected to be 15-19 ℃/min, and the temperature rising rate of the third stage roasting can be selected to be 8-10 ℃/min. The wild vegetable oil can be one of oleum Camelliae, oleum Hippophae and oleum Lini.
Grinding the roasted coffee beans to powder with particle size of 0.45-1.25 mm.
The roasted coffee beans are required to be ground to facilitate extraction, the roasted coffee beans are crushed to be 0.45-1.25mm in particle size, when the crushed particle size is too small, the crushed coffee beans float on the surface of an extraction solvent during extraction, the contact area between the coffee beans and the extraction solvent is small, and the extraction efficiency is influenced. Too large particle size of the broken coffee beans can cause that the broken coffee beans can not be fully contacted with the extraction solvent, namely the contact area of the coffee beans and the extraction solvent is small, and the extraction efficiency is influenced. Preferably, in the embodiment of the present invention, the roasted coffee beans are precisely controlled to be ground to a particle size of 0.6 to 0.8 mm.
Adding the ground coffee beans into an extraction solvent, extracting under certain pressure and temperature until the weight of solid matters in the extraction solvent is 67-77% of the weight of the ground coffee beans, and extracting the extract.
The extraction solvent is selected from water, the water-soluble substance in the coffee bean accounts for about 28 wt% of the coffee bean, and excessive extraction or insufficient extraction can bring the coffee with bad taste, in the embodiment of the invention, the extraction solvent is optionally extracted under the conditions of 1.8-2MPa pressure and 85-90 deg.C until the weight of solid matters in the extraction solvent is 67-77% of the weight of the ground coffee bean, and the extraction liquid is extracted.
In addition, the weight ratio of the ground coffee beans to the extraction solvent is 1 (11-15) during extraction, so that the dosage of the extraction solvent is reduced on the premise of maximally extracting water-soluble substances in the coffee beans, and the coffee beans are convenient to concentrate more quickly.
Vacuum concentrating the extractive solution at-45-55 deg.C to obtain concentrated solution with concentration of 38-40%.
The concentration under normal pressure usually requires higher temperature to remove the solvent, but the excessive temperature can cause the loss of aromatic substances and selenium element in the coffee, so the embodiment of the invention adopts low-temperature vacuum concentration to prepare the concentrated solution. And the concentration of the concentrated solution is controlled to be 38-40%, so that the spray drying is facilitated. Optionally, the pressure of the vacuum concentration is 82.7-90.6 Kpa.
And drying the concentrated solution by adopting a spray drying method to obtain the solid granular selenium-rich herbaceous coffee.
The spray drying method can prepare instant coffee granules on the premise of keeping aromatic substances in the coffee to the maximum extent, and is convenient to drink. In addition, the temperature of hot air in spray drying is not too high, and optionally, the temperature of hot air in spray drying is 110-.
The embodiment of the invention also provides instant selenium-rich herbaceous coffee which is prepared by adopting the preparation method.
The preparation method of the instant selenium-rich herbaceous coffee provided by the invention is illustrated by the following examples.
Example one
The embodiment of the invention provides a preparation method of instant selenium-rich herbaceous coffee, which adopts the selenium-rich herbaceous coffee beans as raw materials and comprises the following steps:
removing impurities, broken beans, shrunken grains and mildewed beans in the coffee beans by using an electric windmill, cleaning the coffee beans by using purified water, and drying for later use.
Sequentially roasting the dried coffee beans at 150 ℃ in a first stage to 200 ℃, wherein the heating rate is 5 ℃/min, roasting at 200 ℃ in a second stage to 135 ℃, wherein the cooling rate is 15 ℃/min, roasting at 135 ℃ in a third stage to 170 ℃, wherein the heating rate is 10 ℃/min, and adding tea oil in the third stage.
Grinding the roasted coffee beans to a powder having a particle size of about 1.25 mm.
Adding ground coffee bean into water at a weight ratio of 1:11, extracting under 1.8Mpa at 90 deg.C until the weight of solid in water is 72% of the weight of ground coffee bean, and extracting to obtain extractive solution.
The extract was concentrated under vacuum at-50 ℃ and 90.6Kpa to a concentration of 38%.
Drying the concentrated solution by spray drying to obtain solid granular selenium-rich herbaceous coffee, wherein the hot air temperature of the spray drying method is 110 ℃.
Example two
The embodiment of the invention provides a preparation method of instant selenium-rich herbaceous coffee, which adopts the selenium-rich herbaceous coffee beans as raw materials and comprises the following steps:
removing impurities, broken beans, shrunken grains and mildewed beans in coffee beans, standing in water for 24h, and fermenting.
And flushing the fermented coffee beans by using running water until the surfaces of the coffee beans are smooth and clean.
The washed coffee beans are spread flat and placed in natural light to be dried for 15 days, so that the moisture content of the coffee beans is less than 12%, and the drying temperature is 25 ℃.
Sequentially roasting the dried coffee beans at 150 ℃ in a first stage to 200 ℃, wherein the heating rate is 7 ℃/min, roasting at 200 ℃ in a second stage to 135 ℃, wherein the cooling rate is 19 ℃/min, roasting at 135 ℃ in a third stage to 170 ℃, wherein the heating rate is 8 ℃/min, and adding the seabuckthorn oil in the third stage.
Grinding the roasted coffee beans to a powder having a particle size of about 0.8 mm.
Adding ground coffee bean into water at a weight ratio of 1:15, extracting under 2Mpa at 85 deg.C until the weight of solid in water is 67% of the weight of ground coffee bean, and extracting.
The extract was concentrated under vacuum at-55 deg.C and 82.7Kpa to a 40% concentration.
Drying the concentrated solution by spray drying to obtain solid granular selenium-rich herbaceous coffee, wherein the hot air temperature of the spray drying method is 115 ℃.
EXAMPLE III
The embodiment of the invention provides a preparation method of instant selenium-rich herbaceous coffee, which adopts the selenium-rich herbaceous coffee beans as raw materials and comprises the following steps:
removing impurities, broken beans, shrunken grains and mildewed beans in the coffee beans, washing the coffee beans with purified water, and drying for later use.
Sequentially roasting the dried coffee beans at 150 ℃ in a first stage to raise the temperature to 200 ℃, wherein the heating rate is 6 ℃/min, roasting at 200 ℃ in a second stage to lower the temperature to 135 ℃, wherein the cooling rate is 17 ℃/min, roasting at 135 ℃ in a third stage to raise the temperature to 170 ℃, wherein the heating rate is 9 ℃/min, and adding linseed oil in the third stage.
Grinding the roasted coffee beans to a powder having a particle size of about 0.6 mm.
Adding ground coffee bean into water at a weight ratio of 1:12, extracting under 1.9Mpa at 88 deg.C until the weight of solid in water is 77% of the weight of ground coffee bean, and extracting the extractive solution.
The extract was concentrated at-45 ℃ under vacuum at 90Kpa to a concentration of 39%.
Drying the concentrated solution by spray drying to obtain solid granular selenium-rich herbaceous coffee, wherein the hot air temperature of the spray drying method is 120 ℃.
The nutrient components of the instant selenium-rich herbaceous coffee prepared by the embodiment of the invention comprise: 395 kilojoules (kj) per 20 g of energy, 0.8 g (g) per 20 g of protein, 4 g (g) per 20 g of fat, 16 mg (mg) per 20 g of carbohydrate and 15 ug (ug) per 20 g of selenium, and the selenium-enriched functional food has good color, fragrance and taste and is a new resource of health-care functional food.
According to the instant selenium-rich herbaceous coffee and the preparation method thereof, coffee beans are roasted by a sectional heating mode, and wild vegetable oil is added in the third stage, so that the best effect of the color, the fragrance and the taste of the coffee beans is achieved. Extracting water-soluble components from the coffee beans at a certain temperature and pressure, and controlling the extraction rate to make the extracted coffee have optimal taste. Vacuum concentration of the extract at low temperature prevents loss of aroma and selenium from the coffee. The spray drying method can prepare instant coffee granules on the premise of keeping aromatic substances in the coffee to the maximum extent, and is convenient to drink.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Selenium-rich herbaceous coffee beans are characterized by containing selenium, and the content of the selenium in the coffee beans is more than 70 mug/100 g.
2. A method for preparing instant selenium-enriched herbaceous coffee, characterized in that the selenium-enriched herbaceous coffee beans of claim 1 are used as raw materials, comprising:
removing impurities, broken beans, shrunken grains and mildewed beans in the coffee beans, cleaning the coffee beans with purified water, and drying for later use;
sequentially roasting the dried coffee beans at 150 ℃ in a first stage to increase the temperature to 200 ℃, roasting at 200 ℃ in a second stage to decrease the temperature to 135 ℃, roasting at 135 ℃ in a third stage to increase the temperature to 170 ℃, and adding wild vegetable oil in the third stage;
grinding the roasted coffee beans to powder with a particle size of 0.45-1.25 mm;
adding the ground coffee beans into an extraction solvent, extracting under certain pressure and temperature until the weight of solid matters in the extraction solvent is 67-77% of the weight of the ground coffee beans, and extracting an extract;
vacuum concentrating the extractive solution at-45-55 deg.C to obtain 38-40% concentrated solution;
and drying the concentrated solution by adopting a spray drying method to obtain the solid granular selenium-rich herbaceous coffee.
3. The method of claim 2, wherein washing coffee beans with purified water and drying the coffee beans for use comprises:
standing in water for 18-36 hr to ferment;
flushing the fermented coffee beans by using running water until the surfaces of the coffee beans are smooth and clean;
spreading the washed coffee beans, and drying in natural light for 10-20 days to make the water content of the coffee beans less than 12% and the drying temperature of 22-28 deg.C.
4. The method of preparing instant selenium-enriched herbaceous coffee as claimed in claim 2, wherein the temperature rising rate of the first stage is 5-7 ℃/min, the temperature lowering rate of the second stage is 15-19 ℃/min, and the temperature rising rate of the third stage is 8-10 ℃/min.
5. The method of preparing instant selenium-enriched herbaceous coffee according to claim 2, wherein the wild vegetable oil is one of tea oil, sea buckthorn oil and linseed oil.
6. The method of preparing instant selenium-enriched herbaceous coffee as set forth in claim 2, wherein the roasted coffee beans are ground into a powder having a particle size of 0.6-0.8 mm.
7. The method for preparing instant selenium-enriched herbaceous coffee as claimed in claim 2, wherein the pressure of extraction is 1.8-2Mpa, the temperature is 85-90 ℃, and the weight ratio of the ground coffee beans to the extraction solvent is 1 (11-15).
8. The method of claim 2, wherein the vacuum concentration is at a pressure of about 82.7Kpa to about 90.6 Kpa.
9. The method of claim 2, wherein the hot air temperature of the spray drying method is 110-120 ℃.
10. Instant selenium-enriched herbaceous coffee, characterized in that it is prepared by the preparation method according to any one of claims 2-9.
Priority Applications (1)
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| CN201910186293.XA CN111685212A (en) | 2019-03-12 | 2019-03-12 | Instant selenium-rich herbaceous coffee and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112806457A (en) * | 2021-01-14 | 2021-05-18 | 云南咖啡厂有限公司 | Fructus cannabis roasted coffee and preparation method thereof |
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