CN115380982A - Preparation process of water-soluble ganoderma lucidum spore instant coffee powder - Google Patents
Preparation process of water-soluble ganoderma lucidum spore instant coffee powder Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 111
- 240000008397 Ganoderma lucidum Species 0.000 title claims abstract description 73
- 235000001637 Ganoderma lucidum Nutrition 0.000 title claims abstract description 73
- 235000021539 instant coffee Nutrition 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 235000013353 coffee beverage Nutrition 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000012153 distilled water Substances 0.000 claims abstract description 20
- 238000004108 freeze drying Methods 0.000 claims abstract description 15
- 238000000605 extraction Methods 0.000 claims abstract description 13
- 238000007710 freezing Methods 0.000 claims description 23
- 230000008014 freezing Effects 0.000 claims description 23
- 238000002156 mixing Methods 0.000 claims description 21
- 235000003599 food sweetener Nutrition 0.000 claims description 17
- 239000008187 granular material Substances 0.000 claims description 17
- 239000003765 sweetening agent Substances 0.000 claims description 17
- 239000006228 supernatant Substances 0.000 claims description 16
- 235000013365 dairy product Nutrition 0.000 claims description 14
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- 238000000034 method Methods 0.000 claims description 9
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- 241000533293 Sesbania emerus Species 0.000 claims description 8
- 239000000706 filtrate Substances 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 4
- 238000010257 thawing Methods 0.000 claims description 4
- WBZFUFAFFUEMEI-UHFFFAOYSA-M Acesulfame k Chemical compound [K+].CC1=CC(=O)[N-]S(=O)(=O)O1 WBZFUFAFFUEMEI-UHFFFAOYSA-M 0.000 claims description 2
- 235000010358 acesulfame potassium Nutrition 0.000 claims description 2
- 229960004998 acesulfame potassium Drugs 0.000 claims description 2
- 239000000619 acesulfame-K Substances 0.000 claims description 2
- 235000021552 granulated sugar Nutrition 0.000 claims description 2
- 238000010902 jet-milling Methods 0.000 claims description 2
- 239000012856 weighed raw material Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 241000222336 Ganoderma Species 0.000 abstract description 28
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- 206010002660 Anoxia Diseases 0.000 description 1
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- UDIPTWFVPPPURJ-UHFFFAOYSA-M Cyclamate Chemical compound [Na+].[O-]S(=O)(=O)NC1CCCCC1 UDIPTWFVPPPURJ-UHFFFAOYSA-M 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
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Classifications
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- 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
- A23F5/36—Further treatment of dried coffee extract; Preparations produced thereby, e.g. instant coffee
- A23F5/40—Further treatment of dried coffee extract; Preparations produced thereby, e.g. instant coffee using organic additives, e.g. milk, sugar
-
- 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
- A23F5/32—Drying or concentrating coffee extract by lyophilisation
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Abstract
The invention discloses a preparation process of water-soluble ganoderma spore instant coffee powder, and relates to the technical field of coffee processing. The invention firstly carries out embrittlement treatment on ganoderma lucidum spore powder, then carries out high-pressure airflow wall breaking, then carries out multiple extraction by using distilled water, and obtains water-soluble ganoderma lucidum spore powder after concentration, freeze drying. Then, cold extraction and freeze drying are carried out on the coffee, so that loss of aromatic substances in the coffee powder is avoided, and the flavor and nutrition of the coffee are kept; finally, the ganoderma lucidum spore powder with the nerve soothing effect is matched with the coffee, so that the defects of the ganoderma lucidum spore powder and the coffee are overcome, and the synergistic effect is achieved, so that the coffee product with the nutritional value of the ganoderma lucidum spore and without affecting the mouthfeel is obtained.
Description
Technical Field
The invention belongs to the technical field of coffee processing, and particularly relates to a preparation process of water-soluble ganoderma lucidum spore instant coffee powder.
Background
The ganoderma lucidum spore powder is formed by gathering spores emitted in the growth process of ganoderma lucidum sporocarp, has all genetic materials and health care functions of ganoderma lucidum, has higher nutritional value than the ganoderma lucidum, and has the health care function which is dozens of times of that of the ganoderma lucidum sporocarp. Research shows that the ganoderma lucidum spore powder mainly contains active ingredients such as polysaccharides, triterpenes, sterols and alkaloids, and has various pharmacological effects such as cancer resistance, liver protection, blood fat reduction, blood sugar reduction, anoxia resistance, inflammation resistance, free radical elimination, immunoregulation and the like; the Chinese medicinal composition can be clinically used for the adjuvant treatment of lung cancer, intestinal cancer, cardiovascular and cerebrovascular diseases and the like. However, most of the ganoderma lucidum spores are composed of spore walls, so that nutrient substances are difficult to absorb and are difficult to dissolve in water, and the taste of the ganoderma lucidum spore powder coffee is seriously influenced. Therefore, it is necessary to prepare a water-soluble ganoderma lucidum spore powder.
Coffee is one of the most popular non-alcoholic beverages made from roasted coffee beans. Coffee has many nutritious health components, and proper amount of coffee can stimulate cerebral cortex, promote sensation, judgment and memory, make cardiac muscle more active, dilate blood vessel, promote blood circulation and improve metabolism. However, the high-temperature extraction can lose the aromatic substances in the coffee, and can also cause the generation of undesirable substances, influence the flavor of the coffee and harm the health of human bodies.
Therefore, it is a research focus in the industry to provide an instant coffee product that is safe to eat and has a high nutritional value.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation process of water-soluble ganoderma spore instant coffee powder.
The invention is realized by adopting the following technical means:
a preparation process of water-soluble ganoderma lucidum spore instant coffee powder comprises the following steps:
(1) Freezing embrittlement treatment: freezing the ganoderma lucidum spore powder at low temperature, immediately performing high-temperature unfreezing treatment, and repeating freezing-unfreezing operation until embrittled ganoderma lucidum spore powder is obtained;
(2) High pressure jet milling, namely performing high pressure jet impact wall breaking treatment on the embrittled ganoderma lucidum spore powder at the pressure of 200-400MPa and the temperature of 140-150 ℃, and sieving to obtain wall-broken ganoderma lucidum spore powder;
(3) Preparing water-soluble ganoderma lucidum spore granules, namely mixing wall-broken ganoderma lucidum spore powder with the mass ratio of 1; centrifuging the filtrate to obtain supernatant, and freeze-drying the supernatant after concentrating to obtain water-soluble ganoderma lucidum spores;
(4) Grinding coffee beans into coffee powder, continuously extracting the coffee powder with low-temperature distilled water under high pressure to obtain extract, concentrating the extract to 20-30% of the original volume, and freeze-drying the concentrated extract to obtain frozen coffee powder;
(5) Mixing, namely respectively sieving the frozen coffee powder, the non-dairy creamer and the sweetener by a 100-mesh sieve for later use; then weighing the following raw materials in percentage by weight:
10-25% of frozen coffee powder, 30-50% of non-dairy creamer, 15-25% of sweetening agent and 5-10% of water-soluble ganoderma lucidum spore powder, wherein the sum of the mass percentages of the raw materials is 100%;
and finally, uniformly mixing the weighed raw materials to obtain the water-soluble ganoderma lucidum spore instant coffee powder.
Preferably, the freezing temperature in the step (1) is-40 to-80 ℃, the thawing temperature is 80 to 100 ℃, and the number of times of the freezing-thawing operation is 5 to 10.
Preferably, the dwell time of the high-pressure air flow impact in the step (2) is 2 hours, and the impact target distance is less than 10 mm.
Preferably, step (2) is a 200 mesh sieve.
Preferably, the extraction temperature in the step (3) is 80-100 ℃, and the extraction is repeated for 3-5 times; the centrifugal rotating speed of the step (3) is 1500-3000r/min, and the centrifugal processing time is 10-15 minutes.
Preferably, the supernatant in the step (3) is frozen and dried after being concentrated to 10-20% of the original volume; the freeze drying is to pre-freeze for 12-16 hours at the temperature of-20 to-40 ℃ and then freeze for 40-48 hours at the temperature of-55 to-65 ℃.
Preferably, the low-temperature distilled water in the step (4) is distilled water with the temperature of 0-10 ℃.
Preferably, the mass ratio of the coffee powder to the distilled water in the step (4) is 1.
Preferably, the pressure of the high-pressure extraction in the step (4) is 0.1-0.9MPa, and the extraction time is 2-6 hours.
Preferably, the sweetener in step (5) includes, but is not limited to, white granulated sugar, sodium cyclamate and acesulfame potassium.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a preparation process of water-soluble ganoderma spore instant coffee powder, which comprises the steps of carrying out embrittlement treatment on ganoderma spore powder, then carrying out high-pressure airflow wall breaking, then carrying out multiple extraction by using distilled water, concentrating, freezing and drying to obtain the water-soluble ganoderma spore powder. The water-soluble ganoderma lucidum spore powder has high water solubility, active ingredients are easy to absorb, and the taste is good.
Secondly, the coffee is subjected to cold extraction and freeze drying treatment, so that loss of aromatic substances in the coffee powder is avoided, and the flavor and nutrition of the coffee are kept;
finally, the ganoderma lucidum spore powder with the nerve soothing effect is matched with the coffee, so that the defects of the ganoderma lucidum spore powder and the coffee are overcome, and the synergistic effect is achieved, so that the coffee product with the nutritional value of the ganoderma lucidum spore and without affecting the mouthfeel is obtained.
Detailed Description
The present invention will be described in detail with reference to the following examples so that the objects, features and advantages thereof will be more clearly understood. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Example 1
A preparation method of water-soluble ganoderma spore instant coffee powder comprises the following specific steps:
1) Freezing and embrittling treatment, namely putting the ganoderma lucidum spore powder into an environment with the temperature of-80 ℃, quickly freezing for 30 minutes, taking out and quickly putting into a constant-temperature water bath with the temperature of 90 ℃ for unfreezing for 20 minutes, and repeatedly treating for 3 times to obtain embrittled ganoderma lucidum spore powder;
2) High-pressure airflow crushing, namely, loading the embrittled ganoderma lucidum spore powder under the high-pressure airflow at the loading condition of 300MPa, heating the system at 140 ℃, maintaining the pressure for 2 hours, enabling the impact target distance to be 10mm, and sieving the powder by a 400-mesh sieve to obtain wall-broken ganoderma lucidum spore powder;
3) The preparation method of water soluble Ganoderma spore granule comprises mixing wall-broken Ganoderma spore powder with distilled water at a mass ratio of 1. Centrifuging the filtrate at 1500r/min for 10 min, collecting supernatant, concentrating the supernatant to 20% of the original volume, pre-freezing at-40 deg.C for 12 hr, and freeze-drying at-65 deg.C for 48 hr to obtain water-soluble Ganoderma spore particles;
4) Grinding coffee bean into 1000 μm coffee powder, extracting coffee powder with 4 deg.C distilled water under 0.1MPa for 3 hr to obtain extractive solution, concentrating the extractive solution to 20% of original volume, pre-freezing the concentrated solution at-40 deg.C for 12 hr, and freeze-drying at-65 deg.C for 40 hr to obtain frozen coffee powder;
5) And (2) mixing, namely respectively sieving the frozen coffee powder, the non-dairy creamer and the sweetening agent by a 100-mesh sieve, then mixing with water-soluble ganoderma spore granules according to the weight ratio of 2.25g of frozen coffee powder, 3.45g of sweetening agent, 6.75g of non-dairy creamer and 1.2g of water-soluble ganoderma spore granules uniformly to obtain the water-soluble ganoderma spore instant coffee powder.
Example 2
A preparation method of water-soluble ganoderma lucidum spore instant coffee powder comprises the following specific steps:
1) Freezing and embrittling treatment, namely putting the ganoderma lucidum spore powder into an environment with the temperature of 50 ℃ below zero, quickly freezing for 30 minutes, taking out, quickly putting into a constant-temperature water bath with the temperature of 80 ℃ for unfreezing for 20 minutes, and repeatedly treating for 3 times to obtain embrittled ganoderma lucidum spore powder;
2) High-pressure airflow pulverizing, namely subjecting the embrittled ganoderma lucidum spore powder to high-pressure airflow loading under the conditions of 200MPa, system heating temperature of 140 ℃, pressure maintaining time of 2 hours, impact target distance of 10mm, and sieving with a 400-mesh sieve to obtain wall-broken ganoderma lucidum spore powder;
3) The preparation method of water soluble Ganoderma spore granule comprises mixing wall-broken Ganoderma spore powder with distilled water at a mass ratio of 1. Centrifuging the filtrate at 1500r/min for 10 min, collecting supernatant, concentrating the supernatant to 20% of the original volume, pre-freezing at-40 deg.C for 12 hr, and freeze-drying at-65 deg.C for 48 hr to obtain water-soluble Ganoderma spore particles;
4) Grinding coffee bean into 1000 μm coffee powder, extracting coffee powder with 4 deg.C distilled water under 0.1MPa for 3 hr to obtain extractive solution, concentrating the extractive solution to 20% of the original volume, prefreezing the concentrated solution at-40 deg.C for 12 hr, and lyophilizing at-65 deg.C for 40 hr to obtain frozen coffee powder;
5) And (2) mixing, namely respectively sieving the frozen coffee powder, the non-dairy creamer and the sweetener by a 100-mesh sieve, then mixing with water-soluble ganoderma lucidum spore granules according to the weight ratio of 2.25g of the frozen coffee powder, 3.45g of the sweetener, 6.75g of the non-dairy creamer and 1.2g of the water-soluble ganoderma lucidum spore granules uniformly to obtain the water-soluble ganoderma lucidum spore instant coffee powder.
Example 3
A preparation method of water-soluble ganoderma spore instant coffee powder comprises the following specific steps:
1) Freezing and embrittling treatment, namely putting the ganoderma lucidum spore powder into an environment with the temperature of-60 ℃, quickly freezing for 30 minutes, taking out and quickly putting into a constant-temperature water bath with the temperature of 100 ℃ for unfreezing for 20 minutes, and repeatedly treating for 3 times to obtain embrittled ganoderma lucidum spore powder;
2) High-pressure airflow pulverizing, namely subjecting the embrittled ganoderma lucidum spore powder to high-pressure airflow loading under the conditions of 400MPa, system heating temperature of 140 ℃, pressure maintaining time of 2 hours, impact target distance of 10mm, and sieving with a 400-mesh sieve to obtain wall-broken ganoderma lucidum spore powder;
3) The preparation method of water soluble Ganoderma spore granule comprises mixing wall-broken Ganoderma spore powder with distilled water at a mass ratio of 1. Centrifuging the filtrate at 1500r/min for 10 min, collecting supernatant, concentrating the supernatant to 20% of the original volume, pre-freezing at-40 deg.C for 12 hr, and freeze-drying at-65 deg.C for 48 hr to obtain water-soluble Ganoderma spore particles;
4) Grinding coffee bean into 1000 μm coffee powder, extracting coffee powder with 4 deg.C distilled water under 0.1MPa for 3 hr to obtain extractive solution, concentrating the extractive solution to 20% of the original volume, prefreezing the concentrated solution at-40 deg.C for 12 hr, and lyophilizing at-65 deg.C for 40 hr to obtain frozen coffee powder;
5) And (2) mixing, namely respectively sieving the frozen coffee powder, the non-dairy creamer and the sweetener by a 100-mesh sieve, then mixing with water-soluble ganoderma lucidum spore granules according to the weight ratio of 2.25g of the frozen coffee powder, 3.45g of the sweetener, 6.75g of the non-dairy creamer and 1.2g of the water-soluble ganoderma lucidum spore granules uniformly to obtain the water-soluble ganoderma lucidum spore instant coffee powder.
Example 4
A preparation method of water-soluble ganoderma lucidum spore instant coffee powder comprises the following specific steps:
1) Freezing and embrittling treatment, namely putting the ganoderma lucidum spore powder into an environment with the temperature of-80 ℃, quickly freezing for 30 minutes, taking out and quickly putting into a constant-temperature water bath with the temperature of 90 ℃ for unfreezing for 20 minutes, and repeatedly treating for 3 times to obtain embrittled ganoderma lucidum spore powder;
2) High-pressure airflow crushing, namely, loading the embrittled ganoderma lucidum spore powder under the high-pressure airflow at the loading condition of 300MPa, heating the system at 140 ℃, maintaining the pressure for 2 hours, enabling the impact target distance to be 10mm, and sieving the powder by a 400-mesh sieve to obtain wall-broken ganoderma lucidum spore powder;
3) The preparation method of water soluble Ganoderma spore granule comprises mixing wall-broken Ganoderma spore powder with distilled water at a mass ratio of 1. Centrifuging the filtrate at 1500r/min for 10 min, collecting supernatant, concentrating the supernatant to 20% of the original volume, pre-freezing at-30 deg.C for 12 hr, and lyophilizing at-60 deg.C for 48 hr to obtain water-soluble Ganoderma spore particles;
4) Grinding coffee bean into 1000 μm coffee powder, extracting coffee powder with 4 deg.C distilled water under 0.1MPa for 3 hr to obtain extractive solution, concentrating the extractive solution to 20% of original volume, prefreezing the concentrated solution at-20 deg.C for 12 hr, and freeze drying at-60 deg.C for 40 hr to obtain frozen coffee powder;
5) And (2) mixing, namely respectively sieving the frozen coffee powder, the non-dairy creamer and the sweetening agent by a 100-mesh sieve, then mixing with water-soluble ganoderma spore granules according to the weight ratio of 2.25g of frozen coffee powder, 3.45g of sweetening agent, 6.75g of non-dairy creamer and 1.2g of water-soluble ganoderma spore granules uniformly to obtain the water-soluble ganoderma spore instant coffee powder.
Example 5
A preparation method of water-soluble ganoderma lucidum spore instant coffee powder comprises the following specific steps:
1) Freezing and embrittling treatment, namely putting the ganoderma lucidum spore powder into an environment with the temperature of-70 ℃, quickly freezing for 30 minutes, taking out and quickly putting into a constant-temperature water bath with the temperature of 85 ℃ for unfreezing for 20 minutes, and repeatedly treating for 3 times to obtain embrittled ganoderma lucidum spore powder;
2) High-pressure airflow pulverizing, namely subjecting the embrittled ganoderma lucidum spore powder to high-pressure airflow loading under the conditions of 350MPa, system heating temperature of 140 ℃, pressure maintaining time of 2 hours, impact target distance of 10mm, and sieving with a 400-mesh sieve to obtain wall-broken ganoderma lucidum spore powder;
3) The preparation method of water soluble Ganoderma spore granule comprises mixing wall-broken Ganoderma spore powder with distilled water at a mass ratio of 1. Centrifuging the filtrate at 1500r/min for 10 min, collecting supernatant, concentrating the supernatant to 20% of the original volume, pre-freezing at-30 deg.C for 12 hr, and lyophilizing at-60 deg.C for 48 hr to obtain water-soluble Ganoderma spore particles;
4) Grinding coffee bean into 1000 μm coffee powder, extracting coffee powder with 4 deg.C distilled water under 0.1MPa for 3 hr to obtain extractive solution, concentrating the extractive solution to 20% of original volume, prefreezing the concentrated solution at-30 deg.C for 12 hr, and freeze drying at-60 deg.C for 40 hr to obtain frozen coffee powder;
5) And (2) mixing, namely respectively sieving the frozen coffee powder, the non-dairy creamer and the sweetener by a 100-mesh sieve, then mixing with water-soluble ganoderma lucidum spore granules according to the weight ratio of 2.25g of the frozen coffee powder, 3.45g of the sweetener, 6.75g of the non-dairy creamer and 1.2g of the water-soluble ganoderma lucidum spore granules uniformly to obtain the water-soluble ganoderma lucidum spore instant coffee powder.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation process of water-soluble ganoderma lucidum spore instant coffee powder is characterized by comprising the following steps:
(1) Freezing embrittlement treatment: freezing the ganoderma lucidum spore powder at low temperature, immediately performing high-temperature unfreezing treatment, and repeating freezing-unfreezing operation until embrittled ganoderma lucidum spore powder is obtained;
(2) High pressure jet milling, namely performing high pressure jet impact wall breaking treatment on the embrittled ganoderma lucidum spore powder at the pressure of 200-400MPa and the temperature of 140-150 ℃, and sieving to obtain wall-broken ganoderma lucidum spore powder;
(3) Preparing water-soluble ganoderma lucidum spore granules, namely mixing wall-broken ganoderma lucidum spore powder with the mass ratio of 1; centrifuging the filtrate to obtain supernatant, and freeze-drying the supernatant after concentrating to obtain water-soluble ganoderma lucidum spores;
(4) Grinding coffee beans into coffee powder, continuously extracting the coffee powder with low-temperature distilled water under high pressure to obtain extract, concentrating the extract to 20-30% of the original volume, and freeze-drying the concentrated extract to obtain frozen coffee powder;
(5) Mixing, namely respectively sieving the frozen coffee powder, the non-dairy creamer and the sweetener by a 100-mesh sieve for later use; then weighing the following raw materials in percentage by weight:
10-25% of frozen coffee powder, 30-50% of non-dairy creamer, 15-25% of sweetening agent and 5-10% of water-soluble ganoderma lucidum spore powder, wherein the sum of the mass percentages of the raw materials is 100%;
and finally, uniformly mixing the weighed raw materials to obtain the water-soluble ganoderma lucidum spore instant coffee powder.
2. The process according to claim 1, wherein the freezing temperature in step (1) is-40 to-80 ℃, the thawing temperature is 80 to 100 ℃, and the number of repetitions of freezing-thawing operation is 5 to 10.
3. The process according to claim 1, wherein the high-pressure gas stream in step (2) is impinged for 2 hours at a dwell time and at a target distance of 10mm or less.
4. The process of claim 1, wherein step (2) is a 200 mesh screen.
5. The process according to claim 1, wherein the extraction temperature in the step (3) is 80 to 100 ℃, and the extraction is repeated 3 to 5 times; the centrifugal rotating speed of the step (3) is 1500-3000r/min, and the centrifugal processing time is 10-15 minutes.
6. The process according to claim 1, wherein the supernatant of step (3) is concentrated to 10-20% of the original volume and then freeze-dried; the freeze drying is to pre-freeze for 12-16 hours at the temperature of-20 to-40 ℃ and then freeze for 40-48 hours at the temperature of-55 to-65 ℃.
7. The process according to claim 1, wherein the low-temperature distilled water in the step (4) is distilled water at 0 to 10 ℃.
8. The preparation process according to claim 1, wherein the mass ratio of the coffee powder to the distilled water in the step (4) is 1.
9. The process according to claim 1, wherein the pressure of the high-pressure extraction in the step (4) is 0.1-0.9MPa, and the extraction time is 2-6 hours.
10. The process of claim 1, wherein the sweetener in step (5) includes, but is not limited to, white granulated sugar, sweetener, acesulfame potassium.
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