CN111011772A - Method for preparing longan superfine powder by superfine grinding - Google Patents
Method for preparing longan superfine powder by superfine grinding Download PDFInfo
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- CN111011772A CN111011772A CN201911334959.8A CN201911334959A CN111011772A CN 111011772 A CN111011772 A CN 111011772A CN 201911334959 A CN201911334959 A CN 201911334959A CN 111011772 A CN111011772 A CN 111011772A
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- 239000000843 powder Substances 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000000227 grinding Methods 0.000 title claims abstract description 52
- 244000139609 Euphoria longan Species 0.000 title 1
- 240000001008 Dimocarpus longan Species 0.000 claims abstract description 251
- 239000000203 mixture Substances 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 238000010298 pulverizing process Methods 0.000 claims description 3
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- 238000012545 processing Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 235000009508 confectionery Nutrition 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 13
- 239000002245 particle Substances 0.000 description 13
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- 229920002774 Maltodextrin Polymers 0.000 description 3
- 239000005913 Maltodextrin Substances 0.000 description 3
- 229930006000 Sucrose Natural products 0.000 description 3
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 3
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- GFFGJBXGBJISGV-UHFFFAOYSA-N Adenine Chemical compound NC1=NC=NC2=C1N=CN2 GFFGJBXGBJISGV-UHFFFAOYSA-N 0.000 description 2
- 235000000525 Dimocarpus longan Nutrition 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- 229960000643 adenine Drugs 0.000 description 2
- 229960001231 choline Drugs 0.000 description 2
- OEYIOHPDSNJKLS-UHFFFAOYSA-N choline Chemical compound C[N+](C)(C)CCO OEYIOHPDSNJKLS-UHFFFAOYSA-N 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
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- 235000019605 sweet taste sensations Nutrition 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 241001093760 Sapindaceae Species 0.000 description 1
- 108010073771 Soybean Proteins Proteins 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
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- ZYGHJZDHTFUPRJ-UHFFFAOYSA-N benzo-alpha-pyrone Natural products C1=CC=C2OC(=O)C=CC2=C1 ZYGHJZDHTFUPRJ-UHFFFAOYSA-N 0.000 description 1
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- 238000001599 direct drying Methods 0.000 description 1
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- 229940079593 drug Drugs 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 229930003935 flavonoid Natural products 0.000 description 1
- 235000017173 flavonoids Nutrition 0.000 description 1
- 150000002215 flavonoids Chemical class 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
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- 230000007760 free radical scavenging Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 235000013402 health food Nutrition 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001900 immune effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229920001542 oligosaccharide Polymers 0.000 description 1
- 150000002482 oligosaccharides Chemical class 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- 235000019710 soybean protein Nutrition 0.000 description 1
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- 229920001864 tannin Polymers 0.000 description 1
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Classifications
-
- 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
- A23L19/00—Products from fruits or vegetables; Preparation or treatment thereof
- A23L19/09—Mashed or comminuted products, e.g. pulp, purée, sauce, or products made therefrom, e.g. snacks
-
- 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
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Nutrition Science (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Mycology (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
Abstract
The application belongs to the technical field of agricultural product processing, and particularly relates to a method for preparing longan superfine powder by superfine grinding. The invention discloses a method for preparing longan superfine powder by superfine grinding, which comprises the following steps: (1) crushing longan shell to obtain coarse longan shell powder; (2) uniformly mixing and crushing the longan shell coarse powder obtained in the step (1) and longan pulp to obtain a mixture; (3) and (3) adding the longan shell coarse powder obtained in the step (1) into the mixture obtained in the step (2), uniformly mixing, and carrying out low-temperature dry-method superfine grinding for a certain time to obtain the longan shell superfine powder. According to the invention, the longan shell coarse powder with different proportions is added in different stages of crushing and drying the longan pulp, so that the problem of superfine crushing of polysaccharide materials is solved on the basis of not additionally adding auxiliary materials, and the obtained longan superfine powder effectively maintains the flavor and the nutritional ingredients of longan.
Description
Technical Field
The application belongs to the technical field of agricultural product processing, and particularly relates to a method for preparing longan superfine powder by superfine grinding.
Background
Longan (Dimocarpus longan Long) is a special fruit that is both a health food and a tonic drug. The longan pulp is aril of longan, has certain dietary therapy value, sweet taste and warm nature, enters heart and spleen channels, and has the effects of tonifying heart and spleen, nourishing blood and calming nerves. Dried longan pulp is usually made into dried longan for eating. The longan shell is the pericarp of longan, has the efficacies of dispelling wind, detoxifying, healing sore, promoting granulation and the like, and is eaten as tea or soup after being dried. Because of the large molecular weight, when the longan polysaccharide prepared by the traditional hot water extraction method is dissolved in water, molecular chains are mutually crosslinked due to hydrogen bond interaction, so that the longan polysaccharide has high viscosity, is easy to aggregate and precipitate in a solution and has low solubility.
The superfine grinding technology is a processing technology which is developed rapidly in recent years and is widely applied in the field of food. The technology can reduce the particle size of the raw material to be less than 30 mu m, and the obtained product has fine and uniform particles, low requirement on the raw material and high utilization rate. Related research reports at home and abroad carry out superfine grinding on the bean dregs, the pomace, the bones, the bran and the like so as to improve the taste, promote the absorption of nutrient substances, enhance the function and health care effect and the like. However, materials with high sugar content cannot be directly subjected to superfine grinding due to high sugar viscosity, and auxiliary materials are required to be added for superfine grinding treatment, so that the flavor and nutrition of the materials are changed. For example, patent CN102972706B discloses that the original flavor and nutrition of longan can be changed by adding longan pulp, soybean powder, soybean protein, maltodextrin and sucrose powder and micronizing at low temperature.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for preparing longan superfine powder by superfine grinding, which is characterized in that longan shell coarse powder with different proportions is added in different stages of grinding and drying longan pulp, so that the problem of superfine grinding of polysaccharide materials is solved on the basis of not additionally adding auxiliary materials, and the obtained longan superfine powder effectively maintains the flavor and the nutritional ingredients of longan.
The invention provides a method for preparing longan superfine powder by superfine grinding, which comprises the following steps:
(1) crushing longan shell to obtain coarse longan shell powder;
(2) uniformly mixing and crushing the longan shell coarse powder obtained in the step (1) and longan pulp to obtain a mixture;
(3) and (3) adding the longan shell coarse powder obtained in the step (1) into the mixture obtained in the step (2), uniformly mixing, and carrying out low-temperature dry-method superfine grinding for a certain time to obtain the longan shell superfine powder.
Preferably, in the step (1), the longan shell is pulverized to 60-100 meshes to obtain longan shell coarse powder.
In a preferable technical scheme, in the step (2), the longan shell coarse powder obtained in the step (1) and the longan pulp are uniformly mixed and crushed to 60-80 meshes to obtain a mixture.
As a preferred technical solution, in the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is (0.08-0.15): 1.
as a preferred technical solution, in the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is (0.1-0.15): 1.
as a preferable technical scheme, the longan shell coarse powder added in the step (3) accounts for 5-10% of the total mass of the longan shell coarse powder and the longan pulp in the step (2).
As a preferable technical scheme, the longan shell coarse powder added in the step (3) accounts for 8-10% of the total mass of the longan shell coarse powder and the longan pulp in the step (2).
As a preferable technical scheme, the temperature of the low-temperature dry-method superfine grinding is 5-25 ℃.
As a preferable technical scheme, the low-temperature dry-method superfine grinding is carried out for 15-40 min.
In a second aspect, the invention provides longan ultra-fine powder obtained by the method.
Detailed Description
For purposes of the following detailed description, it is to be understood that the invention may assume various alternative variations and step sequences, except where expressly specified to the contrary. Moreover, other than in any operating examples, or where otherwise indicated, all numbers expressing, for example, quantities of ingredients used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that may vary depending upon the desired properties to be obtained by the present invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein. For example, a stated range from "1 to 10" should be considered to include any and all subranges between the minimum value of 1 and the maximum value of 10. Exemplary subranges of the range 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, and the like.
In order to solve the problems, the invention provides a method for preparing longan superfine powder by superfine grinding, which comprises the following steps:
(1) crushing longan shell to obtain coarse longan shell powder;
(2) uniformly mixing and crushing the longan shell coarse powder obtained in the step (1) and longan pulp to obtain a mixture;
(3) and (3) adding the longan shell coarse powder obtained in the step (1) into the mixture obtained in the step (2), uniformly mixing, and carrying out low-temperature dry-method superfine grinding for a certain time to obtain the longan shell superfine powder.
Step (1)
The longan shell is pericarp of Dimocarpus Longan of Sapindaceae.
The longan shell contains coarse fiber 65-80%, and has high activity, and nutritional components such as triterpenes, phenols, flavonoids, coumarins, yellow pigment, organic acids, tannin, oligosaccharide, and protein.
The longan shell has antioxidant activity and strong free radical scavenging capacity; has immunological activity, and can be used for treating burn and scald.
In a preferred embodiment, in the step (1), the longan shell is pulverized to 60-100 mesh to obtain longan shell coarse powder.
In the present application, the longan shell in the step (1) is dried longan shell, which means that the longan shell is dried at low temperature until the water content is 6-10%.
In the present application, the water content is determined by direct drying in g/100 g.
Step (2)
As a preferred embodiment, the longan shell coarse powder obtained in the step (1) and the longan pulp are uniformly mixed and crushed to 60-80 meshes to obtain a mixture;
in the present application, the dried longan pulp in the step (2) is prepared by drying longan pulp at a low temperature until the water content is 8-12%.
The arillus longan is pericarp of D.longan Long. The dried pulp contained 79.77% soluble fraction, 19.39% insoluble matter, 3.36% ash. The soluble part of the extract contains 26.91 percent of glucose (glucose), 0.22 percent of sucrose (sucrose), 1.26 percent of acids (calculated by tartaric acid), 6.309 percent of nitrogen-containing substances such as adenine (adenine) and choline (choline), and the like. In addition, it also contained 5.6% protein and fat impurities and residual nucleocapsids.
As a preferred embodiment, in the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is (0.08-0.15): 1.
preferably, in the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is (0.1-0.15): 1.
according to the application, the longan shell and the longan pulp are dried at low temperature, so that the moisture can be removed, and meanwhile, the effect of not damaging the nutritional ingredients can be achieved; meanwhile, the thermosensitive components are kept to the maximum extent and are not damaged; can also keep sweet taste, and minimize the loss of effective components of arillus longan and arillus longan.
Step (3)
As a preferred embodiment, the longan shell coarse powder added in the step (3) is 5-10% of the total mass of the longan shell coarse powder and the longan pulp in the step (2).
Preferably, the longan shell coarse powder added in the step (3) accounts for 8-10% of the total mass of the longan shell coarse powder and the longan pulp in the step (2).
As a preferred embodiment, the low-temperature dry-method superfine grinding is carried out for 15-40 min.
Preferably, the low-temperature dry-method superfine grinding is carried out for 30 min.
The superfine grinding is that superfine grinding equipment utilizes turbulence generated by high-speed rotation of a rotor to add longan shells and longan pulp into ultrahigh-speed airflow, and multi-pole staggered small chambers arranged on the rotor can generate variable-speed vortex, so that high-frequency oscillation is formed, the movement direction and speed of materials are instantaneously and violently changed, and the materials are rapidly rubbed and collided to be cracked into superfine powder particles through repeated collision.
In this application, the super little crushing apparatus of dry process name is the super little rubbing crusher of vibration, and the model is WZJ 6. .
In a preferred embodiment, the temperature of the low-temperature dry ultrafine grinding is 5 to 25 ℃.
The applicant finds that by adding the longan shell into the longan pulp, the ultrafine grinding can be well carried out on the basis of not adding any auxiliary material, and the taste of the longan cannot be damaged; particularly, after the longan shells are added in batches in the steps (2) and (3), the longan shell is subjected to low-temperature dry-method superfine grinding for 30min, so that the obtained longan superfine powder has the particle size of less than 11 microns and low dispersion; presumably because the longan shell contains a high content of crude fiber, the fiber has high activity; but also contains nutrient substances such as organic acid and the like; the added dragon shell can promote internal stress of each part of the longan pulp due to uneven shrinkage, so that the weak part is broken and cracked, the binding force of the internal tissue of the longan pulp is reduced, and the longan pulp is very easy to break into fine powder when being subjected to a certain external acting force.
In a second aspect, the present invention provides longan ultra-fine powder obtained by the method.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
In addition, the starting materials used are all commercially available, unless otherwise specified.
Examples
Example 1
A method for preparing longan superfine powder by superfine grinding comprises the following steps:
(1) crushing longan shell powder to 80 meshes to obtain longan shell coarse powder;
(2) uniformly mixing the longan shell coarse powder obtained in the step (1) with longan pulp, and crushing the mixture into 80 meshes to obtain a mixture;
(3) and (3) adding the longan shell coarse powder obtained in the step (1) into the mixture obtained in the step (2), uniformly mixing, and carrying out low-temperature dry-method superfine grinding for a certain time to obtain the longan shell superfine powder.
The longan shell in the step (1) is dried longan shell, and the longan shell is dried at low temperature until the water content is 8.35%.
The dried longan pulp in the step (2) is dried longan pulp, and the dried longan pulp is obtained by drying the longan pulp at a low temperature until the water content is 10.2%.
In the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is 0.1: 1.
the longan shell coarse powder added in the step (3) accounts for 8% of the total mass of the longan shell coarse powder and the longan pulp in the step (2); carrying out superfine grinding for 15min by the low-temperature dry method; the temperature was 10 ℃.
Example 2
A method for preparing longan superfine powder by superfine grinding comprises the following steps:
(1) crushing longan shell powder to 60 meshes to obtain longan shell coarse powder;
(2) uniformly mixing the longan shell coarse powder obtained in the step (1) with longan pulp, and crushing the mixture into 60 meshes to obtain a mixture;
(3) and (3) adding the longan shell coarse powder obtained in the step (1) into the mixture obtained in the step (2), uniformly mixing, and carrying out low-temperature dry-method superfine grinding for a certain time to obtain the longan shell superfine powder.
The longan shell in the step (1) is dried longan shell, and the longan shell is dried at low temperature until the water content is 8.35%.
The dried longan pulp in the step (2) is dried longan pulp, and the dried longan pulp is obtained by drying the longan pulp at a low temperature until the water content is 10.2%.
In the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is 0.15: 1.
the longan shell coarse powder added in the step (3) accounts for 10% of the total mass of the longan shell coarse powder and the longan pulp in the step (2); carrying out superfine grinding for 30min by the low-temperature dry method; the temperature was 15 ℃.
Example 3
A method for preparing longan superfine powder by superfine grinding comprises the following steps:
(1) crushing longan shell powder to 100 meshes to obtain longan shell coarse powder;
(2) uniformly mixing the longan shell coarse powder obtained in the step (1) with longan pulp, and crushing the mixture into 80 meshes to obtain a mixture;
(3) and (3) adding the longan shell coarse powder obtained in the step (1) into the mixture obtained in the step (2), uniformly mixing, and carrying out low-temperature dry-method superfine grinding for a certain time to obtain the longan shell superfine powder.
The longan shell in the step (1) is dried longan shell, and the longan shell is dried at low temperature until the water content is 8.35%.
The dried longan pulp in the step (2) is dried longan pulp, and the dried longan pulp is obtained by drying the longan pulp at a low temperature until the water content is 10.2%.
In the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is 0.08: 1.
the longan shell coarse powder added in the step (3) accounts for 5% of the total mass of the longan shell coarse powder and the longan pulp in the step (2); carrying out superfine grinding for 40min by the low-temperature dry method; the temperature was 25 ℃.
Comparative example 1
A method for preparing longan superfine powder by superfine grinding, which has the same specific steps as example 2, and is characterized in that longan shells are replaced by longan kernels.
Comparative example 2
A method for preparing longan superfine powder by superfine grinding comprises the following steps: mixing arillus longan, pulverizing to 80 mesh, adding maltodextrin, mixing, and micronizing at low temperature by dry method.
The dried longan pulp is prepared by drying longan pulp at low temperature until the water content is 10.2%.
The mass of the maltodextrin is 25% of that of the arillus longan;
carrying out superfine grinding for 30min by the low-temperature dry method; the temperature was 20 ℃.
Comparative example 3
A method for preparing longan superfine powder by superfine grinding comprises the following steps:
(1) crushing longan shell powder to 60 meshes to obtain longan shell coarse powder;
(2) uniformly mixing the longan shell coarse powder obtained in the step (1) with longan pulp, and crushing the mixture into 60 meshes to obtain a mixture;
(3) and (3) carrying out low-temperature dry-method superfine grinding on the mixture obtained in the step (2) for a certain time to obtain the superfine grinding powder.
The longan shell in the step (1) is dried longan shell, and the longan shell is dried at low temperature until the water content is 8.35%.
The dried longan pulp in the step (2) is dried longan pulp, and the dried longan pulp is obtained by drying the longan pulp at a low temperature until the water content is 10.2%.
In the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is 0.265: 1.
carrying out low-temperature dry-method superfine grinding for 30min in the step (3); the temperature was 20 ℃.
Comparative example 4
A method for preparing longan superfine powder by superfine grinding is the same as example 2 in specific steps, and is characterized in that the low-temperature dry-method superfine grinding is carried out for 20min in the step (3); the temperature was-10 ℃.
Comparative example 5
A method for preparing longan superfine powder by superfine grinding comprises the following steps:
(1) crushing longan shell powder to 60 meshes to obtain longan shell coarse powder;
(2) uniformly mixing the longan shell coarse powder obtained in the step (1) with longan pulp, and crushing the mixture into 60 meshes to obtain a mixture;
(3) and (3) adding the longan shell coarse powder obtained in the step (1) into the mixture obtained in the step (2), uniformly mixing, and carrying out low-temperature dry-method superfine grinding for a certain time to obtain the longan shell superfine powder.
The longan shell in the step (1) is dried longan shell, and the longan shell is dried at low temperature until the water content is 8.35%.
The dried longan pulp in the step (2) is dried longan pulp, and the dried longan pulp is obtained by drying the longan pulp at a low temperature until the water content is 10.2%.
In the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is 0.15: 1.
the longan shell coarse powder added in the step (3) accounts for 15% of the total mass of the longan shell coarse powder and the longan pulp in the step (2); carrying out superfine grinding for 30min by the low-temperature dry method; the temperature was 25 ℃.
Comparative example 6
A method for preparing longan superfine powder by superfine grinding comprises the following steps:
(1) crushing longan shell powder to 60 meshes to obtain longan shell coarse powder;
(2) uniformly mixing the longan shell coarse powder obtained in the step (1) with longan pulp, and crushing the mixture into 60 meshes to obtain a mixture;
(3) and (3) adding the longan shell coarse powder obtained in the step (1) into the mixture obtained in the step (2), uniformly mixing, and carrying out low-temperature dry-method superfine grinding for a certain time to obtain the longan shell superfine powder.
The longan shell in the step (1) is dried longan shell, and the longan shell is dried at low temperature until the water content is 8.35%.
The dried longan pulp in the step (2) is dried longan pulp, and the dried longan pulp is obtained by drying the longan pulp at a low temperature until the water content is 10.2%.
In the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is 0.05: 1.
the longan shell coarse powder added in the step (3) accounts for 8% of the total mass of the longan shell coarse powder and the longan pulp in the step (2); carrying out superfine grinding for 30min by the low-temperature dry method; the temperature was 25 ℃.
Performance testing
And (3) particle size testing: the ultrafine powders obtained in examples 1 to 3 and comparative examples 1 to 6 were subjected to the test, and the results are shown in Table 1.
And (3) particle size testing: the average particle size was measured in μm using a particle size detector.
Dispersion of particle size distribution ═ D90-D10)/D50The smaller the dispersion, the narrower the particle size distribution, and the smaller the number of excessively large and excessively small particles, the more concentrated the particle size.
The mouthfeel is as follows: randomly taking 45 healthy volunteers 25-60 years old, randomly dividing into 9 groups, and brewing longan ultra-fine powder for 5 persons in each group, and drinking to evaluate the taste.
TABLE 1
| Particle size | Degree of dispersion | Taste of the product | |
| Example 1 | 17.56 | 2.91 | Sweet and sweet |
| Example 2 | 10.43 | 1.89 | Sweet and sweet |
| Example 3 | 10.11 | 1.75 | Sweet and sweet |
| Comparative example 1 | 18.86 | 3.07 | Bitter and astringent |
| Comparative example 2 | 28.53. | 4.55 | Sweet and sweet |
| Comparative example 3 | 11.39 | 1.92 | Sweet and sweet |
| Comparative example 4 | 21.55 | 3.29 | Sweet and sweet |
| Comparative example 5 | 16.22 | 2.94 | Sweet and sweet |
| Comparative example 6 | 29.01 | 4.72 | Sweet and sweet |
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may modify or change the technical content of the above disclosure into equivalent embodiments with equivalent changes, but all those simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the present invention.
Claims (10)
1. A method for preparing longan superfine powder by superfine grinding is characterized by comprising the following steps:
(1) crushing longan shell to obtain coarse longan shell powder;
(2) uniformly mixing and crushing the longan shell coarse powder obtained in the step (1) and longan pulp to obtain a mixture;
(3) and (3) adding the longan shell coarse powder obtained in the step (1) into the mixture obtained in the step (2), uniformly mixing, and carrying out low-temperature dry-method superfine grinding for a certain time to obtain the longan shell superfine powder.
2. The method for preparing longan ultra-fine powder as set forth in claim 1, wherein the longan shell is pulverized to 60-100 mesh in the step (1) to obtain longan shell meal.
3. The method for preparing longan ultra-fine powder as claimed in claim 1, wherein in the step (2), the longan shell meal and the longan aril obtained in the step (1) are uniformly mixed and crushed to 60-80 meshes to obtain a mixture.
4. The method for preparing longan ultra-fine powder as claimed in claim 3, wherein in the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is (0.08-0.15): 1.
5. the method for preparing longan ultra-micro powder as claimed in claim 4, wherein in the step (2): the mass ratio of the longan shell coarse powder to the longan pulp is (0.1-0.15): 1.
6. the method for preparing longan ultra-fine powder as claimed in claim 1, wherein the longan shell meal added in the step (3) is 5-10% of the total mass of the longan shell meal and the longan aril in the step (2).
7. The method for preparing longan ultra-fine powder as claimed in claim 6, wherein the longan shell meal added in the step (3) is 8-10% of the total mass of the longan shell meal and the longan aril in the step (2).
8. The method for preparing longan ultra-fine powder as claimed in claim 1, wherein the temperature of the low-temperature dry ultra-fine pulverization is 5-25 ℃.
9. The method for preparing longan ultra-fine powder as claimed in claim 8, wherein the low temperature dry method ultra-fine pulverization is carried out for 15-40 min.
10. Longan ultra fine powder obtained by the method of any one of claims 1 to 9.
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| CN112971064A (en) * | 2021-02-23 | 2021-06-18 | 中国热带农业科学院农产品加工研究所 | Longan pulp superfine powder and preparation method thereof |
| CN113750001A (en) * | 2021-03-24 | 2021-12-07 | 北京东方淼森生物科技有限公司 | Mirabilis jalapa seed powder and preparation method and application thereof |
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| CN113750001A (en) * | 2021-03-24 | 2021-12-07 | 北京东方淼森生物科技有限公司 | Mirabilis jalapa seed powder and preparation method and application thereof |
| CN113750001B (en) * | 2021-03-24 | 2022-07-01 | 北京东方淼森生物科技有限公司 | Mirabilis jalapa seed powder and preparation method and application thereof |
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