CN102793239A - Blueberry/purple sweet potato compound beverage and preparation method thereof - Google Patents
Blueberry/purple sweet potato compound beverage and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a blueberry/purple sweet potato compound beverage which is processed from the following main ingredients: blueberry, purple sweet potato and mulberry, and a preparation method thereof, and belongs to the technical field of food deep processing. The blueberry/purple sweet potato compound beverage is made by special proportioning and compounding of purple blueberry juice, purple sweet potato juice, mulberry juice and auxiliary ingredients. The raw materials are selected, and the three kinds of juices are mixed at a certain ratio. The compound beverage retains the flavors and nutrients in the raw materials to the greatest extent, has a higher nutritional value, is rich in vitamins, minerals and active components, and has no the problems that the purple sweet potato juice has a plain taste and the blueberry juice is not sour or sweet. The preparation method provided by the invention has the characteristics of simple process, low working temperature and less nutrient loss.
Description
Technical field
The present invention relates to blueberry, purple sweet potato, mulberries is purple sweet potato composite beverage of the blueberry that is processed into of primary raw material and preparation method thereof, belongs to technical field of food deep processing.
Background technology
Blueberry belongs to Ericaceae Vaccinium plant, and plantation history is shorter relatively, and the U.S. cultivates blueberry country the earliest in the world, but so far also less than centenary history.In recent years, China's blueberry plant production development was swift and violent, and the Jiangnan, Qingdao becomes maximum planting base, the whole nation.Because of having higher health nutrient, it is worth; So the fashionable world, the edible rate of blueberry reaches 100%, and FAO (Food and Agriculture Organization of the United Nation) classifies them one of as human five big healthy food; Be described as " gold berry ", the U.S. the most influential health magazine " Prevention " is called " magical fruit ".Contain rich nutrient contents in the blueberry fruit; It not only has good nutrition health-care functions; Also have functions such as the cranial nerve of preventing is aging, cardiac stimulant, anticancer softening blood vessel, enhancing body immunity, this mainly is because anthocyanidin, polyphenol, Vc content in the blueberry are very high.Contain great deal of bioactive substances in the blueberry, be called as " number one anti-oxidant " in the fruits and vegetables.
Purple sweet potato is except that the nutritional labeling with common sweet potato; Also be rich in anthocyanidin; Higher medical value is arranged, and is the crop of a kind of easy cultivation, dietotherapeutic, contains multiple human body beneficial elements such as abundant zinc, calcium, magnesium; Contain the selenium element of optimum value especially, its anti-cancer function monopolizes first in all food.Long-term edible, have the body immunity of raising, anti-cancer and cancer-preventing, softening blood vessel, hypotensive, reducing blood lipid, replenish the calcium, health-care effects such as body-building, beauty treatment.The American classifies it as " space food ", and the Japanese is called " first anticancer food ", and it is " life prolonging food " for Taiwanese's honor, and the Hong Kong native claims that then it is " vegetables queen ", and in some flourishing cities of China, the dining table that has become people and liked is newly huge.
Mulberries are the ripening fruits of mulberry tree, and the flavor sweet juice is many, are one of fruit of the normal food of people.Ripe mulberries matter is glossy, sour and sweet palatability, with individual big, meat is thick, look purplish red, the sufficient person of sugar is good.Before more than 2,000 years, mulberries have been the hired tonic of Chinese emperor, are called as " holy fruit among the people ".Research confirms; Contain abundant activated protein, vitamin, amino acid, carrotene, mineral matter and other components in the mulberries fruit, nutrition is 5～6 times of apple, 4 times of grape; Have multiple efficacies, be described as " the best health fruit of 21st century " by medical circle.Mulberries can significantly improve body immunity, have to delay senility the effect of beautifying face and moistering lotion.Effects such as mulberries both can be gone into food, can be used as medicine again, had the enriching yin of enriching blood, and promoted the production of body fluid to quench thirst, and ease constipation is dry.
Though purple sweet potato juice is nutritious, because component contents such as sugar are very low, sugariness is low, bitter taste and the distinctive unhappy smell of sweet potato are arranged; In order to improve mouthfeel, to cover smell, be added with a large amount of additives such as essence usually in the existing purple sweet potato beverage.Blueberry juice, mouthfeel is lighter, adds water and process and sour and astringent taste can occur after the fruit juice, and the cost of blueberry juice is higher, therefore the blueberry component content in the existing blueberry juice lower, be added with a large amount of flavoring agents.The mouthfeel of mulberry juice is better, but its sugar content is higher.People plant mulberry tree at present, mainly are to breed silkworms for the mulberry leaf harvest leaf, and mulberries are a kind of attached product, and therefore output is less comparatively speaking.
Summary of the invention
In order to solve the problems referred to above that the single fruit drink that adopts purple sweet potato, blueberry, mulberries to process exists, the invention provides a kind of is the purple sweet potato composite beverage of primary raw material blueberry that process, natural with blueberry, purple sweet potato, mulberries.
The present invention also provides the preparation method of the purple sweet potato composite beverage of this blueberry.
The purple sweet potato composite beverage of a kind of blueberry is mixed by 3～5 weight portion blueberry juice, the purple sweet potato juice of 3～4 weight portions, 1～3 weight portion mulberry juice, acid, sweetener;
Said blueberry juice, by the 1mg blueberry: the making beating of 2-5ml water is filtered and is processed;
Said purple sweet potato juice, by the purple potato of 1mg: the making beating of 3-8ml water is filtered and is processed;
Said mulberry juice, by the 1mg mulberries: the making beating of 2-5ml water is filtered and is processed;
Said acid, sweetener account for 0.1-1.5%, the 1-8% of blueberry juice, purple sweet potato juice and mulberry juice gross mass respectively.
Blueberry juice, purple sweet potato juice, mulberry juice be flavor enhancement each other, and the tart flavour of blueberry juice has been eliminated pained taste and the unhappy smell of purple sweet potato juice, the high sugar that the low sugar of purple sweet potato juice has reduced in the sugar content of mulberry juice, the mulberry juice has been eliminated the sour and astringent taste in the blueberry juice.Because the solid colour of blueberry, purple sweet potato, three kinds of juice of mulberries all becomes mulberry, therefore three kinds of juice are mixed, and can guarantee the pure of composite beverage color, need not to add colouring agent again.Because the maturity of raw material, the place of production are different, so the sour-sweet degree of blueberry juice, purple sweet potato juice, mulberry juice is slightly different, so add a spot of flavor enhancement to regulate the mouthfeel of composite beverage.
The purple sweet potato composite beverage of above-mentioned blueberry, for the fruity mouthfeel that guarantees that it is strong, said blueberry juice, by the 1mg blueberry: the making beating of 3ml water is filtered and is processed; Said purple sweet potato juice, by the purple sweet potato of 1mg: the making beating of 5ml water is filtered and is processed; Said mulberry juice, by the 1mg mulberries: the making beating of 3ml water is filtered and is processed.
The present invention also provides wherein three kinds of the highest technical schemes of sensory evaluation:
Scheme a: the weight part ratio of said blueberry juice, purple sweet potato juice, mulberry juice is 4:4:2; Said acid is that citric acid, sweetener are rock sugar, and the mass percent of citric acid, rock sugar is respectively 1%, 5%;
Scheme b: the weight part ratio of said blueberry juice, purple sweet potato juice, mulberry juice is 5:4:1; The mass percent of said citric acid, rock sugar is respectively 0.5%, 8%;
Scheme c: the weight part ratio of said blueberry juice, purple sweet potato juice, mulberry juice is 5:3:2; The mass percent of said citric acid, rock sugar is respectively 1.2%, 2%.The sensory evaluation of the purple sweet potato composite beverage of the blueberry of these three kinds of schemes is acceptable drink all more than 6.4; Wherein the sensory evaluation score of the purple sweet potato composite beverage of the blueberry of scheme a is the highest, is 6.7, near the most acceptable drink.
The preparation method of the purple sweet potato composite beverage of a kind of above-mentioned blueberry comprises the steps:
A. prepare blueberry juice, purple sweet potato juice, mulberry juice;
B. blueberry juice, purple sweet potato juice, mulberry juice are mixed in proportion, add acid, sweetener mixing then.
In order to improve the sensory evaluation of the purple sweet potato composite beverage of blueberry, the present invention also further provides the best preparation method of blueberry juice, purple sweet potato juice, mulberry juice among the purple sweet potato composite beverage of the blueberry preparation method:
The preparation method of said blueberry juice is: select fresh, ripe, raciness, the suitable blueberry of sour-sweet degree, reject mould decayed fruit and impurity etc.; The blueberry of choosing is embathed 1～3min in clear water, remove the floating thing on silt and the fruit face.Blueberry with boiling water blanching 0.5-2min, drain, add water making beating, filter, add the 0.2-0.5g/L pectase at 40～55 ℃ of following enzymolysis 40-120min to filtrating, be warmed up to 90～100 ℃ then, the enzyme 10-20min that goes out crosses and filters blueberry juice;
The preparation method of described purple sweet potato juice is: after purple sweet potato cleans up; Reject the part of root, palpus and variable color, and be cut into the bulk of 0.1～0.5cm * 1～2cm, with citric acid solution 80-100 ℃ of blanching 5-20min; Drain; Add the water making beating, filter, with the AMS of filtrating adding 0.5-3g/L, 60～80 ℃ of following enzymolysis 0.5-3h; 90～100 ℃ then, the enzyme 10-20min that goes out crosses and filters purple sweet potato juice;
Described mulberry juice preparation method does; Reject mould decayed fruit, sick wormed fruit and impurity etc.; The mulberries of choosing are embathed 1～3min in clear water; Remove silt and floating thing, drain, add and add the 0.1-0.3g/L pectase after poach is opened, pulls an oar, filtered, 40～55 ℃ of enzymolysis 30-90min; 90～100 ℃ of enzyme 10-20min that go out cross and filter mulberry juice then.
Store for ease, the preparation method of the purple sweet potato composite beverage of above-mentioned blueberry also comprises step c: b step gained mixed liquor is carried out homogeneous, the degassing and sterilization processing successively;
Said homogenization processing: homogeneous is 2-5 time under 20-60MPa pressure;
The said degassing is handled: pressure 2-10Pa, time 2-10min;
Said sterilization processing adopts the high pressure sterilization mode: pressure 200-500MPa, time 15-30min.
Beneficial effect:
Blueberry juice, purple sweet potato juice, mulberry juice are fruit juice, and the bland mouthfeel that is mixed and made into by a certain percentage is good and kept in blueberry, purple sweet potato, the mulberries nutritional labeling separately, and is nutritious.
The single fruit drink that purple sweet potato composite beverage of the blueberry that following embodiment 1-5 is prepared and blueberry juice, purple sweet potato juice, mulberry juice are processed carries out sensory quality assessment.Adopt seven degree methods in the fuzzy mathematics that the composite beverage score value is analyzed, the comment domain is: 1. the most difficult acceptance, and 2. difficult acceptance, 3. difficult slightly acceptance is 4. accepted reluctantly, 5. is prone to slightly accept, and is 6. acceptant, 7. the easiest acceptance.Forming evaluation group by trained 20 people sensory evaluation persons marks.The evaluation field of setting composite beverage is a color and luster, fragrance, acidity, sugariness, bitter taste, figure.Estimate the score result and see table 1:
Table 1
| Prescription | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Estimate | 6.5 | 6.7 | 6.5 | 6.4 | 6.4 | 5.7 | 4.8 | 4.9 | 5.2 |
Prescription 1-6 is the purple sweet potato composite beverage of the made blueberry of embodiment 1-6, wherein fills a prescription 6 for adopting raw material, the method identical with the present invention, still is the composite beverage that the proportioning beyond the present invention is prepared from; Prescription 7 is purple sweet potato fruit juice, and prescription 8 is a blueberry juice, and prescription 9 is a mulberry juice.Can find out that from table 1 the evaluation score of prescription 1-5 is acceptable drink all more than 6.4; And the evaluation score of prescription 6-9 is particularly filled a prescription and 7 is just won branch 4.8 all below 6, and mouthfeel is relatively poor.
The highest prescription 2 of score is carried out the subjective appreciation of each item index by 20 trained sensory evaluation persons; Appraisal result is seen table 2:
Table 2
Wherein the sensory evaluation person more than 75% is acceptant to the comment of the acidity that influences taste, sugariness, bitter taste, and 10% sensory evaluation person's comment is the easiest acceptance.
The specific embodiment
1. prepare blueberry juice a, purple sweet potato juice a, mulberry juice a:
(1) select fresh, ripe, local flavor after, the raw material that sour-sweet degree suits is rejected mould decayed fruit, sick wormed fruit and impurity etc.The blueberry of choosing is embathed 1～3min in clear water, remove silt and floating thing.Blueberry after draining the water poured in the boiling water pot scald 0.5～2min, make the core temperature, pull out then and be placed in the basin at 60～80 ℃.By solid-liquid ratio is that 1mg:3ml adds entry, and making beating is squeezed the juice, and carries out coarse filtration then and obtains blueberry juice a;
(2), clean up afterwards and be cut into the piece of 0.3cm * 1cm, with 80～100 ℃ of blanching 5～20min of 0.15% citric acid solution with the part of fresh purple sweet potato rejecting root, palpus and variable color.By solid-liquid ratio is that 1mg:5ml adds entry and pulls an oar and squeeze the juice; After the coarse filtration; Add high-temperature resistant alpha-amylase enzymolysis 0.3～3h in 60～80 ℃ of water-baths of 0.5～3g/L, be elevated to 90～100 ℃ of deactivation 10～20min then, filter clarification and obtain purple sweet potato juice a;
(3) mulberries are rejected mould decayed fruit, sick wormed fruit and impurity etc., and the mulberries of choosing are embathed 1～3min in clear water, remove silt and floating thing; With the mulberries after draining the water, be that 1mg:3ml adds poach and opens by solid-liquid ratio, stir and make the mulberries particle broken; Coarse filtration obtains mulberry juice a.
2. prepare blueberry juice b, purple sweet potato juice b, mulberry juice b:
(1) select fresh, ripe, local flavor after, the raw material that sour-sweet degree suits is rejected mould decayed fruit, sick wormed fruit and impurity etc.The blueberry of choosing is embathed 1～3min in clear water, remove silt and floating thing.Blueberry after draining the water poured in the boiling water pot scald 0.5～2min, make the core temperature, pull out then and be placed in the basin at 60～80 ℃.By solid-liquid ratio is that 1mg:3ml adds entry, and making beating is squeezed the juice, and carries out coarse filtration then and obtains blueberries raw juice; Add 0.2～0.5g/L pectase, enzymolysis time is 40～120min under 40 ℃ of temperature, and temperature rises to 90～100 ℃ then; Enzyme 10～the 20min that goes out, the centrifugal filtration clarification obtains blueberry juice b;
(2) fresh purple sweet potato is rejected the part of root, palpus and variable color, cleans up afterwards and be cut into the piece of 0.3cm * 1cm, with 80～100 ℃ of blanching 5～20min of 0.15% citric acid solution.By solid-liquid ratio is that 1mg:5ml adds entry and pulls an oar and squeeze the juice; After the coarse filtration; Add high-temperature resistant alpha-amylase enzymolysis 0.5～3h in 60～80 ℃ of water-baths of 0.5～3g/L, be elevated to 90～100 ℃ of deactivation 10～20min then, filter clarification and obtain purple sweet potato juice b;
(3) mulberries are rejected mould decayed fruit, sick wormed fruit and impurity etc., and the mulberries of choosing are embathed 1～3min in clear water, remove silt and floating thing; With the mulberries after draining the water; By solid-liquid ratio is that 1mg:3ml adds poach and opens, and stirs to make the mulberries particle broken coarse filtration; Add under 40～55 ℃ of conditions of pectase of 0.1～0.3g/L enzymolysis 30～90min.Temperature is elevated to 90～100 ℃ then, the enzyme 10～20min that goes out, and the centrifugal filtration clarification obtains mulberry juice b.
3. prepare blueberry juice c, purple sweet potato juice c, mulberry juice c:
(1) select fresh, ripe, local flavor after, the raw material that sour-sweet degree suits is rejected mould decayed fruit, sick wormed fruit and impurity etc.The blueberry of choosing is embathed 1～3min in clear water, remove silt and floating thing.Blueberry after draining the water poured in the boiling water pot scald 0.5～2min, make the core temperature, pull out then and be placed in the basin at 60～80 ℃.By solid-liquid ratio is that 1mg:2ml adds entry; Making beating is squeezed the juice, and carries out coarse filtration then and obtains blueberries raw juice, adds 0.2～0.5g/L pectase; Enzymolysis time is 40～120min under 40～55 ℃ of temperature; Temperature rises to 90～100 ℃ then, the enzyme 10～20min that goes out, and the centrifugal filtration clarification obtains blueberry juice c;
(2) fresh purple sweet potato is rejected the part of root, palpus and variable color, cleans up afterwards and be cut into the piece of 0.3cm * 1cm, with 80～100 ℃ of blanching 5～20min of 0.1% citric acid solution.By solid-liquid ratio is that 1mg:7ml adds entry and pulls an oar and squeeze the juice, and after the coarse filtration, adds high-temperature resistant alpha-amylase enzymolysis 0.5～3h in 60～80 ℃ of water-baths of 0.5～3g/L, is elevated to 90～100 ℃ of deactivation 10～20min then, filters clarification and obtains purple sweet potato c;
(3) mulberries are rejected mould decayed fruit, sick wormed fruit and impurity etc., and the mulberries of choosing are embathed 1～3min in clear water, remove silt and floating thing; With the mulberries after draining the water; By solid-liquid ratio is that 1mg:5ml adds poach and opens, and stirs to make the mulberries particle broken coarse filtration; Add under 40～55 ℃ of conditions of pectase of 0.1～0.3g/L enzymolysis 30～90min.Temperature is elevated to 90～100 ℃ then, the enzyme 10～20min that goes out, and the centrifugal filtration clarification obtains mulberry juice c.
Embodiment 1
The mixed of blueberry juice a, purple sweet potato juice a, mulberry juice a being pressed 4:4:2 is composite, and the consumption of adding citric acid is 1.0% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice then; With the rock sugar consumption is 5.0% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice, the dissolving mixing;
With the good solution homogenization processing of mixing homogeneous 5 times under the pressure of 40MPa.Degassing pressure is controlled at 2Pa, time 5min; With the degassing after filled with solution and seal.The mode of super-pressure is adopted in sterilization, and pressure is 500MPa, and the processing time is that 15min gets composite beverage 1.
Embodiment 2
The mixed of blueberry juice b, purple sweet potato juice b, mulberry juice b being pressed 4:4:2 is composite, and the consumption of adding citric acid is 1.0% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice then; With the rock sugar consumption is 5.0% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice, the dissolving mixing;
With the good solution homogenization processing of mixing homogeneous 4 times under the pressure of 40MPa.Degassing pressure is controlled at 2Pa, time 5min; With the degassing after filled with solution and seal.The mode of super-pressure is adopted in sterilization, and pressure is 500MPa, and the processing time is that 15min gets composite beverage 2.
Embodiment 3
With blueberry juice b, purple sweet potato juice b, mulberry juice, the mixed of pressing 3:4:3 is composite, and the consumption of adding citric acid is 0.5% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice then; With the rock sugar consumption is 8.0% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice, the dissolving mixing;
With the good solution homogenization processing of mixing homogeneous 5 times under the pressure of 40MPa.Degassing pressure is controlled at 10Pa, time 5min; With the degassing after filled with solution and seal.The mode of super-pressure is adopted in sterilization, and pressure is 500MPa, and the processing time is that 15min gets composite beverage 3.
Embodiment 4
Adopt blueberry juice, purple sweet potato juice, mulberry juice among the embodiment 2, the mixed of pressing 5:3:2 is composite, and the consumption of adding citric acid is 1.2% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice then; With the rock sugar consumption is 2.0% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice, the dissolving mixing;
With the good solution homogenization processing of mixing homogeneous 2 times under the pressure of 60MPa.Degassing pressure is controlled at 2Pa, time 2min; With the degassing after filled with solution and seal.The mode of super-pressure is adopted in sterilization, and pressure is 200MPa, and the processing time is that 30min gets composite beverage 4.
Embodiment 5
The mixed of blueberry juice c, purple sweet potato juice c, mulberry juice c being pressed 4:4:2 is composite, and the consumption of adding citric acid is 1.0% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice then; With the rock sugar consumption is 5.0% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice, the dissolving mixing;
(5) with the good solution homogenization processing of mixing homogeneous 5 times under the pressure of 20MPa.Degassing pressure is controlled at 10Pa, time 5min; With the degassing after filled with solution and seal.The mode of super-pressure is adopted in sterilization, and pressure is 500MPa, and the processing time is that 15min gets composite beverage 5.
Embodiment 6
According to the 1mg blueberry: 6ml water, the purple sweet potato of 1mg: 9ml water, 1mg mulberries: the ratio of 6ml water prepares blueberry juice d, purple sweet potato juice d, mulberry juice d; Then with blueberry juice d, purple sweet potato juice d, mulberry juice d is the mixed of 2:5:4 according to weight part ratio, the consumption of adding citric acid is 1.0% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice; With the rock sugar consumption is 5.0% of blueberry juice, purple sweet potato juice, three kinds of mixed juice quality of mulberry juice, the dissolving mixing;
With the good solution homogenization processing of mixing homogeneous 5 times under the pressure of 40MPa.Degassing pressure is controlled at 2Pa, time 5min; With the degassing after filled with solution and seal.The mode of super-pressure is adopted in sterilization, and pressure is 500MPa, and the processing time is that 15min gets composite beverage 6.
Claims (8)
1. the purple sweet potato composite beverage of blueberry is characterized in that, is mixed by 3～5 weight portion blueberry juice, the purple sweet potato juice of 3～4 weight portions, 1～3 weight portion mulberry juice, acid and sweetener;
Said blueberry juice, by the 1mg blueberry: the making beating of 2-5ml water is filtered and is processed;
Said purple sweet potato juice, by the purple potato of 1mg: the making beating of 3-8ml water is filtered and is processed;
Said mulberry juice, by the 1mg mulberries: the making beating of 2-5ml water is filtered and is processed;
Said acid, sweetener account for 0.1-1.5%, the 1-8% of blueberry juice, purple sweet potato juice and mulberry juice gross mass respectively.
2. the purple sweet potato composite beverage of blueberry according to claim 1 is characterized in that, said blueberry juice, and by the 1mg blueberry: the making beating of 3ml water is filtered and is processed; Said purple sweet potato juice, by the purple sweet potato of 1mg: the making beating of 5ml water is filtered and is processed; Said mulberry juice, by the 1mg mulberries: the making beating of 3ml water is filtered and is processed.
3. the purple sweet potato composite beverage of blueberry according to claim 2 is characterized in that the weight part ratio of said blueberry juice, purple sweet potato juice, mulberry juice is 4:4:2; Said acid is that citric acid, sweetener are rock sugar,
The mass percent of citric acid, rock sugar is respectively 1%, 5%.
4. the purple sweet potato composite beverage of blueberry according to claim 2 is characterized in that the weight part ratio of said blueberry juice, purple sweet potato juice, mulberry juice is 5:4:1; The mass percent of said citric acid, rock sugar is respectively 0.5%, 8%.
5. the purple sweet potato composite beverage of blueberry according to claim 2 is characterized in that the weight part ratio of said blueberry juice, purple sweet potato juice, mulberry juice is 5:3:2; The mass percent of said citric acid, rock sugar is respectively 1.2%, 2%.
6. the preparation method of a claim 1, the purple sweet potato composite beverages of 2,3,4 or 5 described blueberries is characterized in that, comprises the steps:
A. prepare blueberry juice, purple sweet potato juice, mulberry juice;
B. blueberry juice, purple sweet potato juice, mulberry juice are mixed in proportion, add flavor enhancement then and mix.
7. the preparation method of the purple sweet potato composite beverage of blueberry according to claim 6 is characterized in that the preparation method of said blueberry juice is: the blueberry of choosing is embathed 1～3min in clear water, remove the floating thing on silt and the fruit face; Then with boiling water blanching 0.5-2min, drain, add water making beating, filter, add the 0.2-0.5g/L pectase at 40～55 ℃ of following enzymolysis 40-120min to filtrating, be warmed up to 90～100 ℃ then, the enzyme 10-20min that goes out crosses and filters blueberry juice;
The preparation method of described purple sweet potato juice is: after purple sweet potato cleans up; Reject the part of root, palpus and variable color, and be cut into the bulk of 0.1～0.5cm * 1～2cm, with citric acid solution 80-100 ℃ of blanching 5-20min; Drain; Add the water making beating, filter, with the AMS of filtrating adding 0.5-3g/L, 60～80 ℃ of following enzymolysis 0.5-3h; 90～100 ℃ then, the enzyme 10-20min that goes out crosses and filters purple sweet potato juice;
Described mulberry juice preparation method does; The mulberries of choosing are embathed 1～3min in clear water, remove silt and floating thing, drain, add and add the 0.1-0.3g/L pectase after poach is opened, pulls an oar, filtered, 40～55 ℃ of enzymolysis 30-90min, 90～100 ℃ of enzyme 10-20min that go out cross and filter mulberry juice then.
8. the preparation method of the purple sweet potato composite beverage of blueberry according to claim 7 is characterized in that, also comprises step c: b step gained mixed liquor is carried out homogeneous, the degassing and sterilization processing successively;
Said homogenization processing: homogeneous is 2-5 time under 20-60MPa pressure;
The said degassing is handled: pressure 2-10Pa, time 2-10min;
Said sterilization processing adopts the high pressure sterilization mode: pressure 200-500MPa, time 15-30min.
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