CN1194630C - Sweet potato frozen dried food and its processing method - Google Patents
Sweet potato frozen dried food and its processing method Download PDFInfo
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- CN1194630C CN1194630C CNB011352248A CN01135224A CN1194630C CN 1194630 C CN1194630 C CN 1194630C CN B011352248 A CNB011352248 A CN B011352248A CN 01135224 A CN01135224 A CN 01135224A CN 1194630 C CN1194630 C CN 1194630C
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- sweet potato
- frozen dried
- dried food
- sweet potatoes
- dehydration
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Abstract
The present invention relates to a freeze-dried sweet potato and a processing method thereof. The method comprises the following order steps: the sweet potatoes are peeled; peeled sweet potatoes are cooled to-10 to-30 DEG C in 2.5 to 5 hours; cooled sweet potatoes are sublimated and dewatered under the conditions of a temperature lower than 0 DEG C and the pressure force lower than 610 Pa. Freeze-dried sweet potatoes which are frozen and sublimated are easy to store; the material form of fresh sweet potatoes is kept; the surfaces of the freeze-dried sweet potatoes are not hardened; the rehydration performance is good; the nutrient ingredients and the physiological active substances in the sweet potatoes are furthest reserved; the color of the fresh sweet potatoes reappears; and the flavors of the sweet potatoes keep constant.
Description
Technical field
The present invention relates to a kind of dehydrated food, be specifically related to a kind of sweet potato frozen dried food, the invention still further relates to a kind of processing method of described sweet potato frozen dried food simultaneously.
Background technology
Sweet potato is a kind of nutritious, food that taste is sweet, liked by the consumer.But the sweet potato eating method is single, and inconvenience is used to process various pattern food, and should not store, processing transportation trouble.Be instant edible, processing, storage and transportation, people are processed into dehydrated food with sweet potato.Usually the processing method of sweet potato dehydrated food is the dehydration by evaporation seasoning, and the moisture content that is about in the sweet potato is removed under liquid state, and method is for drying or drying.Sweet potato dehydrated food by dehydration by evaporation processing can not keep the material form of sweet potato, the sclerosis of sweet potato dehydrated food surface, rehydration is bad, in the evaporation process, the nutritional labeling of sweet potato is suffered destruction to a certain degree, and the sweet potato food through dehydration by evaporation processing still should not be stored, and is perishable during storage.
Summary of the invention
The sweet potato dehydrated food that the present invention has overcome the processing of dehydration by evaporation method can not keep the material form of fresh sweet potato, the sclerosis of sweet potato dehydrated food surface, rehydration is bad, perishable shortcoming when the nutritional labeling in the sweet potato is destroyed in various degree and stored, a kind of sweet potato frozen dried food is provided, this sweet potato frozen dried food is easy to storage, material form with fresh sweet potato, the no hardening phenomenon in surface, rehydration is good, keeps nutrition and physiological activator in the sweet potato, and color and luster is fresh, local flavor is constant, can be processed into various pattern food after the pulverizing.
The present invention provides a kind of processing method of above-mentioned sweet potato frozen dried food simultaneously, the sweet potato frozen dried food of this method processing is easy to storage, can keep the material form of fresh sweet potato, the no hardening phenomenon in sweet potato frozen dried food surface, rehydration is good, and can keep nutrition and physiological activator in the sweet potato to greatest extent, and reproduce the color and luster of fresh sweet potato, keep the local flavor of sweet potato constant.
The invention discloses a kind of sweet potato frozen dried food, this sweet potato frozen dried food can be obtained by following method processing: sweet potato is removed the peel, with the sweet potato cutting after the peeling, sweet potato after the cutting was cooled to subzero 10～30 ℃ in 2.5～5 hours, in the dehydration that distils below 0 ℃ and under less than 610Pa pressure, the sweet potato after the dehydration is sweet potato frozen dried food with the sweet potato after the cooling.
Usually before cooling, sweet potato is protected look.For making sweet potato frozen dried food have the color and luster of fresh sweet potato, before cooling is freezing, sweet potato is protected look.
Sweet potato flour after the distillation dehydration is broken into powder.For instant edible, processing, transportation and storage, usually sweet potato frozen dried food is processed into powder.
The invention discloses a kind of processing method of sweet potato frozen dried food, this method comprises the following order step:
(1) sweet potato peeling;
(2) sweet potato after the peeling was cooled to subzero 10～30 ℃ in 2.5～5 hours;
(3) sweet potato after the cooling is in the dehydration that distils below 0 ℃ and under less than 610Pa pressure.
Usually the sweet potato cutting after will removing the peel.Because the volume of whole sweet potato is bigger, for making the moisture content distillation in the sweet potato timely, with the sweet potato cutting after the peeling.
Before cooling, sweet potato is protected look.For making sweet potato frozen dried food keep the color and luster of fresh sweet potato, before cooling is freezing, sweet potato is protected look.
Sweet potato after the peeling was cooled to subzero 15～25 ℃ at 3～4 hours.The crystal formation that forms for the freezing back of moisture content that makes in the sweet potato is easy to distil in dehydration, sweet potato after the peeling was cooled to subzero 10～30 ℃ in 2.5～5 hours, preferred freezing scheme was cooled to subzero 15～25 ℃ for the sweet potato after will removing the peel in 3～4 hours.
Sweet potato is suitably replenished radiant heat and removes the moisture content that sublimation process produces in the distillation dehydration.Owing to take away certain heat during the distillation of the sweet potato ice that moisture content forms in sublimation process, as untimely additional heat, the sublimation process temperature can reduce, it is slack-off that temperature reduces the speed of icing distillation in the back, whole distillation dehydration is spun out, moisture content in the sweet potato can not in time distil, so need timely additional heat in sublimation process.Method to the food supply heat that freezes has dual mode usually, and a kind of is that frozen food directly contacts with thermal source; Another kind of is the noncontact mode, and by radiant heating, radiant heating can guarantee that heat supply is even, so selective radiation heat supply among the present invention.Heat supply is excessive in the sublimation process, and the food that can cause freezing melts, so suitably heat supply guarantees that food freezes all the time in dehydration.After the moisture content distillation in the sweet potato, should in time the moisture content after the distillation be removed for guaranteeing rate of sublimation.
Dried sweet potato after the distillation dehydration is pulverized.Be convenient the storage, edible, further processing, transportation and sale, the sweet potato frozen dried pulverizing after the dehydration that will distil usually.Among the present invention, can select for use various color sweet potatos to be processed into sweet potato frozen dried food, will be broken into powder through the sweet potato flour of vacuum freeze-drying, so that further carry out the processing of various pattern food.
The water content of sweet potato frozen dried food is less than percentage by weight 3% among the present invention, and the yield of sweet potato frozen dried food is about fresh sweet potato percentage by weight 20% to 30%.Sweet potato frozen dried food by the distillation processing of freezing back is easy to storage, can keep the material form of fresh sweet potato, the no hardening phenomenon in sweet potato frozen dried food surface, rehydration is good, and can keep nutrition and physiological activator in the sweet potato to greatest extent, reproduce the color and luster of fresh sweet potato, keep the local flavor of sweet potato constant.
The specific embodiment
The specific embodiment 1
With the sweet potato peeling, the sweet potato after the peeling was cooled to subzero 10 ℃ at 2.5 hours; Sweet potato after the cooling is the distillation dehydration under subzero 0.01 ℃ and 610Pa pressure, obtains sweet potato frozen dried food.
The specific embodiment 2
Sweet potato is removed the peel; Sweet potato after the peeling was cooled to subzero 15 ℃ at 3 hours; Sweet potato after the cooling is the distillation dehydration under subzero 1 ℃ and 600Pa pressure; To obtain Powdered sweet potato frozen dried food after the sweet potato frozen dried pulverizing after the dehydration.
Specific embodiment 3
Sweet potato is removed the peel; With the sweet potato cutting after the peeling; Sweet potato after the cutting is protected look; The sweet potato of protecting behind the look was cooled to subzero 30 ℃ at 4.5 hours; Sweet potato after the cooling is the distillation dehydration under subzero 2 ℃ and 590Pa pressure; In the distillation dehydration, suitably replenish radiant heat and remove the moisture content that sublimation process produces; To obtain Powdered sweet potato frozen dried food after the sweet potato pulverizing after the distillation dehydration.
The specific embodiment 4
Sweet potato is removed the peel; With the sweet potato cutting after the peeling; Sweet potato after the cutting is protected look; The sweet potato of protecting behind the look was cooled to subzero 25 ℃ at 3 hours; Sweet potato after the cooling is the distillation dehydration under subzero 2 ℃ and 590Pa pressure; In the distillation dehydration, suitably replenish radiant heat and remove the moisture content that sublimation process produces; After pulverizing, sweet potato with distillation dehydration after dry obtains Powdered sweet potato frozen dried food.
Claims (8)
1, a kind of sweet potato frozen dried food, this sweet potato frozen dried food is obtained by following method processing: sweet potato is removed the peel, with the sweet potato cutting after the peeling, sweet potato after the cutting was cooled to subzero 10～30 ℃ in 2.5～5 hours, sweet potato after the cooling in the dehydration that distils below 0 ℃ and under less than 610Pa pressure, is obtained sweet potato frozen dried food after the dehydration.
2, sweet potato frozen dried food according to claim 1 is characterized in that: before cooling, sweet potato is protected look.
3, sweet potato frozen dried food according to claim 1 and 2 is characterized in that: the sweet potato flour after the dehydration that will distil is broken into powder.
4, a kind of processing method of sweet potato frozen dried food comprises the following order step:
(1) sweet potato peeling;
(2) sweet potato after the peeling was cooled to subzero 10～30 ℃ in 2.5～5 hours;
(3) sweet potato after the cooling is in the dehydration that distils below 0 ℃ and under less than 610Pa pressure.
5, the processing method of sweet potato frozen dried food according to claim 4 is characterized in that: the sweet potato cutting after will removing the peel.
6, according to the processing method of claim 4 or 5 described sweet potato frozen dried foods, it is characterized in that: before cooling, sweet potato is protected look.
7, according to the processing method of claim 4 or 5 described sweet potato frozen dried foods, it is characterized in that: described temperature-fall period is to be cooled to subzero 15～25 ℃ in 3～4 hours.
8, according to the processing method of claim 4 or 5 described sweet potato frozen dried foods, it is characterized in that: the sweet potato after the dehydration that will distil is pulverized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011352248A CN1194630C (en) | 2001-12-02 | 2001-12-02 | Sweet potato frozen dried food and its processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011352248A CN1194630C (en) | 2001-12-02 | 2001-12-02 | Sweet potato frozen dried food and its processing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1422546A CN1422546A (en) | 2003-06-11 |
| CN1194630C true CN1194630C (en) | 2005-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011352248A Expired - Fee Related CN1194630C (en) | 2001-12-02 | 2001-12-02 | Sweet potato frozen dried food and its processing method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102125242A (en) * | 2010-12-24 | 2011-07-20 | 赵发刚 | Producing process of sweet potato strips and pumpkin strips |
| CN103919078A (en) * | 2014-04-19 | 2014-07-16 | 万世凤 | Processing method of purple sweet potato powder |
| CN104171194A (en) * | 2014-08-13 | 2014-12-03 | 山东省农业科学院农产品研究所 | Preparation method of purple sweet potato tea |
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2001
- 2001-12-02 CN CNB011352248A patent/CN1194630C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1422546A (en) | 2003-06-11 |
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Granted publication date: 20050330 Termination date: 20101202 |