CN107114643B - Red date health concentrated juice and preparation method thereof - Google Patents
Red date health concentrated juice and preparation method thereof Download PDFInfo
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- CN107114643B CN107114643B CN201710300481.1A CN201710300481A CN107114643B CN 107114643 B CN107114643 B CN 107114643B CN 201710300481 A CN201710300481 A CN 201710300481A CN 107114643 B CN107114643 B CN 107114643B
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- 238000002386 leaching Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 18
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
- A23L2/385—Concentrates of non-alcoholic beverages
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
- A23L2/02—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation containing fruit or vegetable juices
- A23L2/04—Extraction of juices
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
- A23L2/02—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation containing fruit or vegetable juices
- A23L2/08—Concentrating or drying of juices
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
- A23L2/42—Preservation of non-alcoholic beverages
- A23L2/50—Preservation of non-alcoholic beverages by irradiation or electric treatment without heating
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
- A23L2/70—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter
- A23L2/72—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter by filtration
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
- A23L2/70—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter
- A23L2/72—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter by filtration
- A23L2/74—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter by filtration using membranes, e.g. osmosis, ultrafiltration
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
- A23L2/70—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter
- A23L2/84—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter using microorganisms or biological material, e.g. enzymes
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
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- Health & Medical Sciences (AREA)
- Food Science & Technology (AREA)
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- Chemical & Material Sciences (AREA)
- Polymers & Plastics (AREA)
- Water Supply & Treatment (AREA)
- Microbiology (AREA)
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- Medicines Containing Plant Substances (AREA)
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Abstract
The invention relates to a red date health concentrated juice and a preparation method thereof, wherein the preparation method comprises the following steps: (1) selecting raw materials; (2) cleaning raw materials; (3) crushing and removing cores; (4) softening; (5) pulping; (6) leaching; (7) filtering by a plate frame; (8) fine filtering; (9) concentrating; (10) and (5) sterilizing. Aiming at the problems of obvious cooking taste, dark color, poor clarification effect and stability and serious nutrient loss caused by high-temperature extraction in the existing production process, the processing technology of the production process of the red date concentrated juice is systematically researched, key process parameters of softening, extraction and sterilization are optimized, the influence of different treatment processes on the quality of the red date concentrated juice is evaluated, the optimal vacuum concentration process parameters of the red date juice are established, the flavor, the color and the stability of the red date juice are improved, and the loss of nutrient components is reduced; the fruit vinegar has fragrant, sweet and mellow taste, long shelf life and no high-temperature damage, maintains the original fragrance and special flavor of the fruits, and has no loss of volatile substances.
Description
Technical Field
The invention relates to the technical field of red date processing, and particularly relates to a red date health concentrated juice and a preparation method thereof.
Background
Fructus Jujubae (Zizyphus jujuba), also known as fructus Jujubae, is the fruit of the jujube tree belonging to the genus Ziziphus of Rhamnaceae. The jujube tree is one of the special tree species in China, and the cultivation area and the jujube fruit yield of the jujube tree in China account for more than 95% of the total amount of the world. The cultivation history of Chinese date trees is long, the history is more than 3000 years so far, the Chinese date trees are extremely widely distributed in China, from north to inner Mongolia, from south to two Guangdong, from west to Xinjiang, from east to coastal provinces, and are mainly distributed in Henan, Shandong, Hebei, Shanxi, Xinjiang and other provinces, and the annual output of the red dates accounts for about 90 percent of the whole country.
The red date has extremely high nutritive value and medicinal value, is a high-quality nourishing fruit integrating nutrition and medical care, and is called as 'nutritive health care pill' and 'woody grain'. The Xinjiang red dates are reported to contain protein, organic acid, fat, sugar, 18 amino acids essential to human bodies, trace elements such as calcium, iron, zinc, selenium and phosphorus and rich vitamin A, B1、B2C, P, etc. The research and the analysis of the modern advanced technology find that the Xinjiang red dates also containVarious physiologically active substances, such as fructus Jujubae polysaccharide, vitamin C, flavone, triterpenes, saponins, cAMP, cGMP, etc., have effects of enhancing immunity, resisting oxidation, resisting cancer, lowering blood pressure, reducing blood lipid, etc.
Concentrated fruit juice is the leading product for the further processing and industrial development of most fruits. In the deep-processed red date food in China, the concentrated red date juice can reserve the original nutrients to a greater extent and can provide nutrient components such as vitamins, amino acids, mineral substances and the like required by a human body. In addition, a certain part of water is removed from the red date concentrated juice in the concentration processing process, so that the volume and the weight are reduced, the cost for packaging, transportation and storage is reduced, the water activity is reduced, and the growth of microorganisms can be effectively inhibited.
The patent "a preparation process of red jujube concentrated juice with high cAMP content" discloses a preparation process of red jujube concentrated juice with high cAMP content, which comprises the following steps: (1) sorting, cleaning and crushing; (2) leaching with hot water; (3) cooling, heat preservation and enzyme directional conversion; (4) adding a complex enzyme preparation; (5) inactivating enzyme; (6) centrifuging; (7) filtering; (8) concentrating and pasteurizing; (9) and (6) filling. The process is simple, shortens the production period and reduces the energy consumption; the crushing is carried out firstly, and then the leaching is carried out, so that the leaching of the nutrient components in the Chinese dates can be improved; the processing method combining the leaching and the enzymolysis greatly improves the juice yield, shortens the processing time and improves the adenosine cyclophosphate content in the red date juice.
At present, the research on the processing of the red date concentrated juice mainly focuses on the optimization of processing process conditions, particularly on the aspects of a juice preparation process and a clarification process, the research on the quality of the concentrated juice is less, and the loss of nutrient substances is most important and is most difficult to solve. Therefore, the loss of nutrient substances is prevented, the processing technology is optimized, and the method has important significance for improving the quality of the red date concentrated juice.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the red date health concentrated juice and the preparation method thereof.
In order to solve the problems, the invention adopts the following technical scheme:
a preparation method of red date health concentrated juice comprises the following steps:
(1) selecting raw materials;
(2) cleaning raw materials;
(3) crushing and removing cores;
(4) softening;
(5) pulping;
(6) leaching;
(7) filtering by a plate frame;
(8) fine filtering;
(9) concentrating;
(10) and (5) sterilizing.
A preparation method of red date health concentrated juice comprises the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 5-15 parts by weight of crushed and denucleated red dates, 45-75 parts by weight of water and 0.005-0.05 part by weight of antioxidant, softening at 35-45 ℃ for 40-90 minutes, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten to obtain slurry;
(6) adding pectase 0.2-0.8% of the slurry weight into the slurry, leaching at pH of 2.5-3.5 and temperature of 35-45 deg.C for 1-4 hr to obtain leaching solution;
(7) filtering the leaching solution by using a plate-and-frame filter;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter;
(9) carrying out vacuum concentration on the filtrate after fine filtration by using a rotary evaporator, wherein the vacuum degree is-1 to-0.1 MPa, the temperature is 35-45 ℃, and the concentration is carried out in vacuum until the content of soluble solid is 50-70 Brix;
(10) and (5) sterilizing.
A preparation method of red date health concentrated juice comprises the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 5-15 parts by weight of crushed and denucleated red dates, 45-75 parts by weight of water and 0.005-0.05 part by weight of antioxidant, softening at 35-45 ℃ and under the vacuum degree of 10-50KPa for 40-90 minutes, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten to obtain slurry;
(6) adding pectase 0.2-0.8% of the slurry weight into the slurry, leaching at pH of 2.5-3.5 and temperature of 35-45 deg.C for 1-4 hr to obtain leaching solution;
(7) filtering the leaching solution by using a plate-and-frame filter;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter;
(9) carrying out vacuum concentration on the filtrate after fine filtration by using a rotary evaporator, wherein the vacuum degree is-1 to-0.1 MPa, the temperature is 35-45 ℃, and the concentration is carried out in vacuum until the content of soluble solid is 50-70 Brix;
(10) and (5) sterilizing.
Preferably, the plate-frame filter adopts 100-200-mesh filter cloth for filtration, and the pressure is controlled to be 0.2-0.4 MPa.
Preferably, the ceramic membrane filter has a molecular weight cut-off of 10-100 kD.
Preferably, the antioxidant is one or a mixture of apple polyphenol, resveratrol and catechin.
More preferably, the antioxidant consists of 70-80wt% of apple polyphenol and 20-30wt% of catechin.
Preferably, the sterilization is high-voltage pulse electric field sterilization or pasteurization or high-temperature sterilization.
Further preferably, the sterilization is high-voltage pulse electric field sterilization.
The invention also provides the red date health concentrated juice prepared by the method.
Aiming at the problems of obvious cooking flavor, dark color, poor clarification effect and stability and serious nutrient loss caused by high-temperature extraction in the existing production process, the red date health concentrated juice and the preparation method thereof systematically research the processing technology of the production process of the red date concentrated juice, optimize key process parameters of softening, extraction and sterilization, evaluate the influence of different treatment processes on the quality of the red date concentrated juice, establish the optimal vacuum concentration process parameters of the red date juice, improve the flavor, color and stability of the red date juice and reduce the loss of nutrient components; the concentrated juice disclosed by the invention is fragrant, sweet and mellow in taste, long in quality guarantee period, free of high-temperature damage, capable of keeping the original fragrance and special flavor of fruits and free of volatile substance loss.
Detailed Description
Method for measuring characteristics of red date health concentrated juice
Measurement of light transmittance: the transmittance of the juice was measured at a wavelength of 660nm using a UV1000 type UV-visible spectrophotometer with deionized water as the reference solution.
Determination of cyclic adenosine monophosphate content: column ODS-C18(4.6 mm. times.250 mm, 10 μm); mobile phase 0.02moL/L potassium dihydrogen phosphate solution-methanol (80: 20); detection wavelength: 259 nm; column temperature: 30 ℃; volume flow: 1.0 mL/min; sample introduction amount: 20 μ L.
DPPH radical scavenging activity (DRA) assay: the DPPH method is a simple and fast free radical analysis method, and the principle is that based on the fact that stable free radical DPPH is dark purple in methanol solution and has strong absorption at the wavelength of 517nm, a free radical scavenger makes the color gradually disappear by matching with a single electron thereof, and the fading degree and the number of received electrons form a stoichiometric relationship. Therefore, the ability of the sample to scavenge free radicals can be measured by the change in absorbance. The higher the scavenging rate of the antioxidant for scavenging free radicals, the more antioxidant it is.
(1) Reagent: 0.1mM DPPH-methanol solution, 0.05mol/L Tris-HCl buffer
(2) The method comprises the following operation steps:
sample tube: 2mL of DPPH-methanol solution, 0.9mL of Tris-HCl buffer solution and 0.5mL of red date health concentrated juice.
And (4) control: 2mL of DPPH-methanol solution, 0.9mL of Tris-HCl buffer, and 0.5mL of methanol.
And (5) zero setting of the distilled water pipe.
After adding the sample, the reaction was carried out in the dark for 30min, and the absorbance was measured at 517 nm.
(3) Calculating the formula: clearance (%) × 100 (control tube absorbance-sample tube absorbance)/control tube absorbance).
The raw materials in the examples are introduced:
the red dates are first-grade Ruoqiang grey dates (dried red dates) provided by Xinjiang ice jade Tianshan agricultural science and technology limited.
The beating machine adopts a beating machine provided by Shanghai Guofeng mechanical equipment Limited and having the model of GFM-FP-3, the power is 11kw, the rotating speed is 1470 rpm, and the aperture of the screen mesh is 1 mm.
The plate frame filter is a stainless steel plate frame filter provided by Guangzhou Fengyuan industrial and mechanical Co., Ltd and having model number SHF-150, the aperture of the filter membrane is 0.8 μm, and the filtering pressure is 0.15 MPa.
The pectinase is food-grade pectinase provided by Huaxing bioengineering Co., Ltd in Hunan century, and the enzyme activity is 30000U/g.
Example 1
The preparation method of the red date health concentrated juice comprises the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 10 parts by weight of crushed and denucleated red dates, 65 parts by weight of purified water and 0.01 part by weight of apple polyphenol, softening at the temperature of 95 ℃ for 60 minutes, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten for 3 minutes at the rotating speed of 1470 rpm and the aperture of a screen mesh of 1mm to obtain slurry;
(6) adding pectase in an amount of 0.4% by weight (0.4% by weight) into the slurry, and leaching at 45 deg.C and pH of 3 for 2 hr to obtain leaching solution;
(7) filtering the leaching solution with a plate-and-frame filter, wherein the pore diameter of the filter membrane is 0.8 μm, and the filtering pressure is 0.15 MPa;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter, wherein the molecular weight cut-off of the ceramic membrane filter is 100 KD;
(9) concentrating the filtrate by rotary evaporator under vacuum degree of-0.1 MPa and 45 deg.C to soluble solid content of 60Brix to obtain concentrated solution;
(10) and (3) carrying out high-voltage pulse electric field treatment on the concentrated solution for 3 minutes, wherein the electric field strength is 20KV/cm, the pulse time is 200 muS, and the pulse frequency is 200Hz, so as to obtain the red date health concentrated juice.
Example 2
The preparation method of the red date health concentrated juice comprises the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 10 parts by weight of crushed and denucleated red dates, 65 parts by weight of purified water and 0.01 part by weight of apple polyphenol, softening for 60 minutes at the temperature of 40 ℃ and the vacuum degree of 30KPa, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten for 3 minutes at the rotating speed of 1470 rpm and the aperture of a screen mesh of 1mm to obtain slurry;
(6) adding pectase in an amount of 0.4% by weight (0.4% by weight) into the slurry, and leaching at 45 deg.C and pH of 3 for 2 hr to obtain leaching solution;
(7) filtering the leaching solution with a plate-and-frame filter, wherein the pore diameter of the filter membrane is 0.8 μm, and the filtering pressure is 0.15 MPa;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter, wherein the molecular weight cut-off of the ceramic membrane filter is 100 KD;
(9) concentrating the filtrate by rotary evaporator under vacuum degree of-0.1 MPa and 45 deg.C to soluble solid content of 60Brix to obtain concentrated solution;
(10) and (3) carrying out high-voltage pulse electric field treatment on the concentrated solution for 3 minutes, wherein the electric field strength is 20KV/cm, the pulse time is 200 muS, and the pulse frequency is 200Hz, so as to obtain the red date health concentrated juice.
Example 3
The preparation method of the red date health concentrated juice comprises the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 10 parts by weight of crushed and denucleated red dates, 65 parts by weight of purified water and 0.01 part by weight of apple polyphenol, softening for 60 minutes at the temperature of 40 ℃ and the vacuum degree of 30KPa, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten for 3 minutes at the rotating speed of 1470 rpm and the aperture of a screen mesh of 1mm to obtain slurry;
(6) adding pectase in an amount of 0.4% by weight (0.4% by weight) into the slurry, and leaching at 45 deg.C and pH of 3 for 2 hr to obtain leaching solution;
(7) filtering the leaching solution with a plate-and-frame filter, wherein the pore diameter of the filter membrane is 0.8 μm, and the filtering pressure is 0.15 MPa;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter, wherein the molecular weight cut-off of the ceramic membrane filter is 100 KD;
(9) concentrating the filtrate by rotary evaporator under vacuum degree of-0.1 MPa and 45 deg.C to soluble solid content of 60Brix to obtain concentrated solution;
(10) pasteurizing the concentrated solution at 85 deg.C for 10 min to obtain fructus Jujubae health concentrated juice.
Example 4
The preparation method of the red date health concentrated juice comprises the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 10 parts by weight of crushed and denucleated red dates, 65 parts by weight of purified water and 0.01 part by weight of apple polyphenol, softening for 60 minutes at the temperature of 40 ℃ and the vacuum degree of 30KPa, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten for 3 minutes at the rotating speed of 1470 rpm and the aperture of a screen mesh of 1mm to obtain slurry;
(6) adding pectase in an amount of 0.4% by weight (0.4% by weight) into the slurry, and leaching at 45 deg.C and pH of 3 for 2 hr to obtain leaching solution;
(7) filtering the leaching solution with a plate-and-frame filter, wherein the pore diameter of the filter membrane is 0.8 μm, and the filtering pressure is 0.15 MPa;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter, wherein the molecular weight cut-off of the ceramic membrane filter is 100 KD;
(9) concentrating the filtrate by rotary evaporator under vacuum degree of-0.1 MPa and 45 deg.C to soluble solid content of 60Brix to obtain concentrated solution;
(10) sterilizing the concentrated solution at 125 deg.C for 15 s to obtain fructus Jujubae health concentrated juice.
Example 5
The preparation method of the red date health concentrated juice comprises the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 10 parts by weight of crushed and pitted red dates, 65 parts by weight of purified water and 0.01 part by weight of theanine, softening at 40 ℃ and a vacuum degree of 30KPa for 60 minutes, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten for 3 minutes at the rotating speed of 1470 rpm and the aperture of a screen mesh of 1mm to obtain slurry;
(6) adding pectase in an amount of 0.4% by weight (0.4% by weight) into the slurry, and leaching at 45 deg.C and pH of 3 for 2 hr to obtain leaching solution;
(7) filtering the leaching solution with a plate-and-frame filter, wherein the pore diameter of the filter membrane is 0.8 μm, and the filtering pressure is 0.15 MPa;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter, wherein the molecular weight cut-off of the ceramic membrane filter is 100 KD;
(9) concentrating the filtrate by rotary evaporator under vacuum degree of-0.1 MPa and 45 deg.C to soluble solid content of 60Brix to obtain concentrated solution;
(10) and (3) carrying out high-voltage pulse electric field treatment on the concentrated solution for 3 minutes, wherein the electric field strength is 20KV/cm, the pulse time is 200 muS, and the pulse frequency is 200Hz, so as to obtain the red date health concentrated juice.
Example 6
The preparation method of the red date health concentrated juice comprises the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 10 parts by weight of crushed and pitted red dates, 65 parts by weight of purified water and 0.01 part by weight of resveratrol, softening at the temperature of 40 ℃ and the vacuum degree of 30KPa for 60 minutes, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten for 3 minutes at the rotating speed of 1470 rpm and the aperture of a screen mesh of 1mm to obtain slurry;
(6) adding pectase in an amount of 0.4% by weight (0.4% by weight) into the slurry, and leaching at 45 deg.C and pH of 3 for 2 hr to obtain leaching solution;
(7) filtering the leaching solution with a plate-and-frame filter, wherein the pore diameter of the filter membrane is 0.8 μm, and the filtering pressure is 0.15 MPa;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter, wherein the molecular weight cut-off of the ceramic membrane filter is 100 KD;
(9) concentrating the filtrate by rotary evaporator under vacuum degree of-0.1 MPa and 45 deg.C to soluble solid content of 60Brix to obtain concentrated solution;
(10) and (3) carrying out high-voltage pulse electric field treatment on the concentrated solution for 3 minutes, wherein the electric field strength is 20KV/cm, the pulse time is 200 muS, and the pulse frequency is 200Hz, so as to obtain the red date health concentrated juice.
Example 7
The preparation method of the red date health concentrated juice comprises the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 10 parts by weight of crushed and denucleated red dates, 65 parts by weight of purified water, 0.0075 parts by weight of apple polyphenol and 0.0025 parts by weight of theanine, softening for 60 minutes at the temperature of 40 ℃ and the vacuum degree of 30KPa, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten for 3 minutes at the rotating speed of 1470 rpm and the aperture of a screen mesh of 1mm to obtain slurry;
(6) adding pectase in an amount of 0.4% by weight (0.4% by weight) into the slurry, and leaching at 45 deg.C and pH of 3 for 2 hr to obtain leaching solution;
(7) filtering the leaching solution with a plate-and-frame filter, wherein the pore diameter of the filter membrane is 0.8 μm, and the filtering pressure is 0.15 MPa;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter, wherein the molecular weight cut-off of the ceramic membrane filter is 100 KD;
(9) concentrating the filtrate by rotary evaporator under vacuum degree of-0.1 MPa and 45 deg.C to soluble solid content of 60Brix to obtain concentrated solution;
(10) and (3) carrying out high-voltage pulse electric field treatment on the concentrated solution for 3 minutes, wherein the electric field strength is 20KV/cm, the pulse time is 200 muS, and the pulse frequency is 200Hz, so as to obtain the red date health concentrated juice. The test result of the characteristics of the red date health concentrated juice is as follows: DPPH.clearance rate is 58.9%, light transmittance is 81.3%, and cyclic adenosine monophosphate content is 86.6. mu.g/mL.
Test example 1
The characteristics of the red date health concentrated juice prepared in examples 1 to 6 were tested, and the specific results are shown in table 1.
Table 1: data table for testing characteristics of red date health concentrated juice
The concentrated juice disclosed by the invention is fragrant, sweet and mellow in taste, long in quality guarantee period, free of high-temperature damage, capable of keeping the original fragrance and special flavor of fruits and free of volatile substance loss, and has the advantages of no obvious cooking taste, dark color, poor clarification effect and stability and serious nutrition loss due to high-temperature extraction.
Claims (5)
1. A preparation method of red date health concentrated juice is characterized by comprising the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 5-15 parts by weight of crushed and denucleated red dates, 45-75 parts by weight of water and 0.005-0.05 part by weight of antioxidant, softening at 35-45 ℃ and under the vacuum degree of 10-50KPa for 40-90 minutes, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten to obtain slurry;
(6) adding pectase 0.2-0.8% of the slurry weight into the slurry, leaching at pH of 2.5-3.5 and temperature of 35-45 deg.C for 1-4 hr to obtain leaching solution;
(7) filtering the leaching solution by using a plate-and-frame filter;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter;
(9) carrying out vacuum concentration on the filtrate after fine filtration by using a rotary evaporator, wherein the vacuum degree is minus 1 to minus 0.1MPa, the temperature is 35 to 45 ℃, and the vacuum concentration is carried out until the content of soluble solid matters is 50 to 70 Brix;
(10) sterilizing;
the antioxidant consists of 70-80wt% of apple polyphenol and 20-30wt% of catechin;
the sterilization is high-voltage pulse electric field sterilization.
2. The method for preparing the red date health concentrated juice according to claim 1, wherein the red date health concentrated juice comprises the following steps: the aperture of the filter membrane filtered by the plate-and-frame filter is 0.1-1 μm, and the pressure is controlled to be 0.1-0.4 MPa.
3. The method for preparing the red date health concentrated juice according to claim 1, wherein the red date health concentrated juice comprises the following steps: the molecular weight cut-off of the ceramic membrane filter is 10-100 KD.
4. A preparation method of red date health concentrated juice comprises the following steps:
(1) selecting red dates without diseases, insect pests, mildew, damage and rot;
(2) washing the red dates with water to remove dust and sand on the surfaces of the red dates;
(3) crushing the red dates and taking out date pits;
(4) uniformly mixing 10 parts by weight of crushed and denucleated red dates, 65 parts by weight of purified water, 0.0075 parts by weight of apple polyphenol and 0.0025 parts by weight of theanine, softening for 60 minutes at the temperature of 40 ℃ and the vacuum degree of 30KPa, and cooling to room temperature to obtain a mixture;
(5) adding the mixture into a beater to be beaten for 3 minutes at the rotating speed of 1470 rpm and the aperture of a screen mesh of 1mm to obtain slurry;
(6) adding pectinase 0.4 wt% of the slurry into the slurry, and leaching at 45 deg.C and pH of 3 for 2 hr to obtain leaching solution;
(7) filtering the leaching solution with a plate-and-frame filter, wherein the pore diameter of the filter membrane is 0.8 μm, and the filtering pressure is 0.15 MPa;
(8) fine filtering the filtrate filtered by the plate-and-frame filter by using a ceramic membrane filter, wherein the molecular weight cut-off of the ceramic membrane filter is 100 KD;
(9) concentrating the filtrate by rotary evaporator under vacuum degree of-0.1 MPa and 45 deg.C to soluble solid content of 60Brix to obtain concentrated solution;
(10) and (3) carrying out high-voltage pulse electric field treatment on the concentrated solution for 3 minutes, wherein the electric field strength is 20KV/cm, the pulse time is 200 muS, and the pulse frequency is 200Hz, so as to obtain the red date health concentrated juice.
5. A red date health concentrated juice is characterized in that: prepared by the method of any one of claims 1 to 4.
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| CN108208494A (en) * | 2018-01-09 | 2018-06-29 | 浙江大学 | The production method of jujube clarification juice rich in GABA |
| CN108813239A (en) * | 2018-06-08 | 2018-11-16 | 唐山蓝猫饮品集团有限公司 | A kind of Wild jujube dry fruit Low Temperature Steam leach extraction method, device and its Wild Jujube Juice |
| CN113068780A (en) * | 2021-05-07 | 2021-07-06 | 山西焦煤金土地天骄科技有限公司 | Preparation method of high-Vc fresh jujube pure juice |
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