Preparation and low-temperature extraction method of roxburgh rose fine powder

Abstract

The invention relates to the technical field of rosa roxburghii tratt fruit product production, and provides a preparation low-temperature extraction method of rosa roxburghii tratt fruit fine powder, which comprises the following steps: S1, selecting rosa roxburghii tratt fruits; s2, crushing rosa roxburghii tratt into rosa roxburghii tratt blocks, and then juicing to obtain rosa roxburghii tratt juice; s3, putting the roxburgh rose juice into steam concentration equipment for concentration treatment; s4, adding maltodextrin powder or water-soluble starch into the clarified roxburgh rose juice to obtain a mixed clarified solution; s5, starting an air purification element of the atomization equipment; s6, starting a cooling element of the atomization equipment; s7, a heating element of the atomization equipment is started; s8, introducing the mixed clarified liquid into a spray evaporation chamber of atomization equipment for atomization; s9, feeding the roxburgh rose fine powder into a cyclone collector along with the hot air for solid-gas separation, and collecting the roxburgh rose fine powder; s10, the roxburgh rose fine powder is fed into a vacuum drying chamber to be further dried, and dry fine powder is obtained; s11, the dry fine powder is screened to be loose through screening equipment; and S12, sub-packaging the dry fine powder into small units meeting requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of the production of Rosa roxburghii products, and specifically, to a low-temperature extraction method for the preparation of Rosa roxburghii fine powder. Background Art

[0002] Rosa roxburghii is the fruit of the perennial deciduous shrub Rosa roxburghii Tratt of the Rosaceae family, also known as mountain king fruit, raspberry fruit, Folang fruit, thorn pear, wood pear, with aliases such as thorn pineapple, sending spring back, thorn sour pear, nine-headed bird, and Wenxian fruit, and is a nutritious fruit for nourishing and strengthening the body. The fruit contains rich vitamin C and is known as the "king of vitamin C". Since the harvesting period of Rosa roxburghii is less than 30 days and a large amount of Rosa roxburghii on the market causes unsalable, the prior art preserves the nutritional components of Rosa roxburghii by making it into Rosa roxburghii fine powder;

[0003] After retrieval, in the Chinese patent (publication number: CN108403808A), it is disclosed that "1) Cleaning Rosa roxburghii: Selecting fresh and plump Rosa roxburghii, washing, removing seeds, and drying the surface moisture, and setting aside;

[0004] 2) Extracting juice from Rosa roxburghii: Crushing the Rosa roxburghii obtained in 1) into Rosa roxburghii pieces, extracting juice, and filtering to obtain Rosa roxburghii juice;

[0005] 3) Spray drying: Mashing the Rosa roxburghii juice obtained in 2) for 2 - 5 minutes, and then spray drying to obtain Rosa roxburghii fine powder".

[0006] However, in the process of implementing the related technology, there are certain technical defects in this type of patent. Among them, this type of patent directly spray dries the Rosa roxburghii juice to obtain Rosa roxburghii fine powder. However, due to the strong moisture absorption performance of the produced Rosa roxburghii fine powder, during the drying process, the Rosa roxburghii fine powder is prone to absorbing moisture in the air and caking. In view of this, the present invention proposes a low-temperature extraction method for the preparation of Rosa roxburghii fine powder. Summary of the Invention

[0007] The present invention proposes a low-temperature extraction method for the preparation of Rosa roxburghii fine powder, which solves the problem that the Rosa roxburghii fine powder after the spray drying process of Rosa roxburghii juice in the prior art is prone to absorbing moisture in the air and caking.

[0008] The technical solution of the present invention is as follows: A low-temperature extraction method for the preparation of Rosa roxburghii fine powder, comprising the following steps:

[0009] S1: Selecting fresh and plump Rosa roxburghii, washing, removing seeds, and drying the surface moisture, and setting aside;

[0010] S2: Crushing the washed Rosa roxburghii in S1 into Rosa roxburghii pieces, then extracting juice, filtering to obtain Rosa roxburghii juice, and separating the juice in the Rosa roxburghii residue by a high-speed centrifuge for the Rosa roxburghii residue to further improve the juice yield;

[0011] S3: Put the Rosa roxburghii juice obtained in S2 into a steam concentration device for concentration treatment to obtain concentrated clarified Rosa roxburghii juice;

[0012] S4: Add maltodextrin powder or water-soluble starch to the clarified Rosa roxburghii juice in S3, stir well until it is completely dissolved, and filter to obtain a mixed clarified liquid;

[0013] S5: Start the air purification element of the atomization device, filter and sterilize the air inside the atomization device to obtain sterile and dust-free clean air;

[0014] S6: Then start the cooling element of the atomization device to cool the clean air in S5 to below 6°C to obtain air with a saturated moisture content of 0.9%-1.2%;

[0015] S7: Start the heating element of the atomization device to heat the air obtained in S6 to 60±1°C to obtain hot dry air. The saturated moisture content of the air at this temperature is 11%-13%, and the relative humidity is 6%-8%. Then send the hot dry air into the spray evaporation chamber to evaporate the atomized original Rosa roxburghii juice;

[0016] S8: Import the mixed clarified liquid in S4 into the spray evaporation chamber of the atomization device for atomization. The atomized mixed clarified liquid instantaneously evaporates in the spray evaporation chamber with a relative humidity of less than 8%. The air humidity in the spray evaporation chamber is far from reaching the saturation level, and the Rosa roxburghii juice powder formed by dehydration of the atomized Rosa roxburghii juice is quickly dried;

[0017] S9: Send the dried Rosa roxburghii juice powder in S8 into the cyclone collector with the hot air for solid-gas separation and collect the Rosa roxburghii juice powder. At the same time, introduce cold air below 0°C into the bottom of the cyclone collector to cool the Rosa roxburghii juice powder to ensure that the nutritional components of the powder do not lose;

[0018] S10: Send the Rosa roxburghii juice powder obtained in S9 into the vacuum drying chamber for further drying to obtain dry powder;

[0019] S11: Screen and loosen the dry powder in S9 through a screening device to make the dry powder evenly dispersed, which is convenient for quick dissolution during taking;

[0020] S12: Pack the dry powder in S11 into small units suitable for the needs.

[0021] Preferably, in S2, the crushed Rosa roxburghii blocks are juiced by a screw juicer. Among them, the rotation speed of the screw juicer is 45-80 RPM.

[0022] Preferably, in S2, the filtration process of the juiced Rosa roxburghii juice is as follows:

[0023] (1). Initially filter the squeezed Rosa roxburghii juice through a coarse screen or gauze to remove larger solid particles and impurities;

[0024] (2), then pass the preliminarily filtered Rosa roxburghii juice through a finer sieve, filter paper or filter membrane to finely filter the preliminarily filtered juice, removing fine particles, suspended matter and possible microorganisms in the juice to obtain clear and transparent Rosa roxburghii juice.

[0025] Preferably, in S2, the specific parameters of the centrifugation process of the Rosa roxburghii residue by the high-speed centrifuge are: rotation speed 15000 - 16000 r / min, relative centrifugal force (17800 - 18000)×g, and temperature -20°C - 40°C.

[0026] Preferably, in S2, the specific steps of the concentration treatment of the Rosa roxburghii juice are as follows:

[0027] (1), First, send the Rosa roxburghii juice into the steam concentration equipment, then start the heating element for heating, control the temperature at 120°C - 130°C, so that the water in the Rosa roxburghii juice begins to evaporate to form water vapor;

[0028] (2), As the water in the Rosa roxburghii juice evaporates, the Rosa roxburghii juice gradually concentrates and the concentration increases, and then discharge the concentrated Rosa roxburghii juice from the concentration equipment and collect it in a container;

[0029] (3), Cool the concentrated Rosa roxburghii juice in the container, and then perform high-energy ultrasonic sterilization to obtain sterile concentrated clarified Rosa roxburghii juice.

[0030] Preferably, in S4, maltodextrin powder or water-soluble starch and clarified Rosa roxburghii juice are mixed through a mixing device, the stirring speed is 50 - 200 RPM, and the stirring time is 20 - 30 minutes.

[0031] Preferably, in S5, the air is filtered through a 0.3μm filter, and an ultraviolet lamp is installed on the filter screen to kill bacteria attached to the filter screen, making the filtered air sterile and dust-free.

[0032] Preferably, in S10, the temperature of the vacuum drying chamber is 30°C, and the drying duration is 6 - 8 hours.

[0033] Preferably, in S11, the sieve mesh of the screening equipment is 220 - 300 meshes.

[0034] The working principle and beneficial effects of the present invention are:

[0035] 1. By performing vacuum drying on the atomized and dried Rosa roxburghii fine powder, it is possible to avoid the problem that the atomized and dried Rosa roxburghii fine powder absorbs moisture in the air, resulting in an increase in moisture content and caking, greatly reducing the moisture content of the Rosa roxburghii fine powder finished product, which is beneficial to the long-term preservation of the Rosa roxburghii fine powder;

[0036] 2. By performing low-temperature cooling on the Rosa roxburghii Tratt fine powder after atomization drying, the loss of nutrients in the Rosa roxburghii Tratt fine powder can be reduced, thereby enhancing the nutritional value of the Rosa roxburghii Tratt fine powder. Description of the Drawings

[0037] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0038] Figure 1 It is a table of the moisture content of each experimental subject in Experimental Test Example 1;

[0039] Figure 2 It is a table of the vitamin content of each experimental subject in Experimental Test Example 2; Specific Embodiments

[0040] Next, in conjunction with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0041] The present invention provides a low-temperature extraction method for preparing Rosa roxburghii Tratt fine powder, including the following steps:

[0042] S1: Select fresh and plump Rosa roxburghii Tratt, wash, remove seeds, and dry the surface moisture for later use;

[0043] S2: Crush the washed Rosa roxburghii Tratt in S1 into Rosa roxburghii Tratt blocks, and then juice them through a screw juicer. Among them, the rotation speed of the screw juicer is 45 - 80 RPM, filter to obtain Rosa roxburghii Tratt juice, and then separate the juice in the Rosa roxburghii Tratt residue through a high-speed centrifuge to further improve the juice yield;

[0044] S3: Put the Rosa roxburghii Tratt juice obtained in S2 into a steam concentration device for concentration treatment to obtain concentrated clarified Rosa roxburghii Tratt juice;

[0045] S4: Add maltodextrin powder or water-soluble starch to the clarified Rosa roxburghii Tratt juice in S3, and fully stir it through a mixing device until it is completely dissolved. The stirring speed is 50 - 200 RPM, and the stirring time is 20 - 30 minutes. Filter to obtain a mixed clarified liquid;

[0046] S5: Start the air purification element of the atomization device, filter and sterilize the air inside the atomization device to obtain sterile and dust-free clean air. The air is filtered through a 0.3μm filter, and an ultraviolet lamp is installed on the filter screen to kill the bacteria attached to the filter screen, making the filtered air sterile and dust-free;

[0047] S6: Then start the cooling element of the atomization device to cool the clean air in S5 to below 6°C, obtaining air with a saturated moisture content of 0.9%-1.2%;

[0048] S7: Start the heating element of the atomization device to heat the air obtained in S6 to 60±1°C, obtaining hot dry air. The saturated moisture content of the air at this temperature is 11%-13%, and the relative humidity is 6%-8%. Then send the hot dry air into the spray evaporation chamber for evaporating the atomized original juice of Rosa roxburghii tratt;

[0049] S8: Introduce the mixed clarified liquid in S4 into the spray evaporation chamber of the atomization device for atomization. The atomized mixed clarified liquid instantaneously evaporates in the spray evaporation chamber with a relative humidity less than 8%. The air humidity in the spray evaporation chamber is far from reaching the saturation level, and the Rosa roxburghii tratt fine powder formed by dehydration of the atomized Rosa roxburghii tratt juice is quickly dried;

[0050] S9: Send the dried Rosa roxburghii tratt fine powder in S8 into the cyclone collector with the hot air for solid-gas separation and collect the Rosa roxburghii tratt fine powder. At the same time, introduce cold air below 0°C into the bottom of the cyclone collector to cool the Rosa roxburghii tratt fine powder to ensure that the nutritional components of the fine powder do not lose;

[0051] S10: Send the Rosa roxburghii tratt fine powder obtained in S9 into the vacuum drying chamber for further drying to obtain dry fine powder. The temperature of the vacuum drying chamber is 30°C, and the drying duration is 6-8 hours;

[0052] S11: Screen and loosen the dry fine powder in S9 through a screening device. The screen of the screening device is 220-300 meshes, making the dry fine powder evenly dispersed and facilitating rapid dissolution during taking;

[0053] S12: Pack the dry fine powder in S11 into small units suitable for the demand.

[0054] In the present invention, by performing vacuum drying on the Rosa roxburghii tratt fine powder after atomization drying, the problem that the Rosa roxburghii tratt fine powder after atomization drying absorbs moisture in the air, resulting in an increase in moisture content and caking, can be avoided. The moisture content of the finished Rosa roxburghii tratt fine powder is greatly reduced, which is beneficial to the long-term preservation of the Rosa roxburghii tratt fine powder;

[0055] By performing low-temperature cooling on the Rosa roxburghii tratt fine powder after atomization drying, the loss of nutritional components in the Rosa roxburghii tratt fine powder can be reduced, thereby improving the nutritional value of the Rosa roxburghii tratt fine powder.

[0056] Further, in S2, the filtration process of the Rosa roxburghii tratt juice after juicing is as follows:

[0057] (1). Initially filter the squeezed Rosa roxburghii tratt juice through a coarse screen or gauze to remove larger solid particles and impurities;

[0058] (2) Then, pass the preliminarily filtered Rosa roxburghii Tratt juice through a finer sieve, filter paper, or filter membrane to finely filter the preliminarily filtered juice, removing fine particles, suspended matter, and possible microorganisms in the juice to obtain clear and transparent Rosa roxburghii Tratt juice.

[0059] Further, in S2, the specific parameters of the centrifugation process of the Rosa roxburghii Tratt residue by the high-speed centrifuge are as follows: the rotation speed is 15000 - 16000 r / min, the relative centrifugal force is (17800 - 18000) × g, and the temperature is -20°C - 40°C.

[0060] Further, in S2, the specific steps of the concentration treatment of the Rosa roxburghii Tratt juice are as follows:

[0061] (1) First, feed the Rosa roxburghii Tratt juice into a steam concentration device, then start the heating element for heating, control the temperature at 120°C - 130°C, so that the water in the Rosa roxburghii Tratt juice begins to evaporate to form water vapor;

[0062] (2) As the water in the Rosa roxburghii Tratt juice evaporates, the Rosa roxburghii Tratt juice gradually concentrates and its concentration increases. Then, discharge the concentrated Rosa roxburghii Tratt juice from the concentration device and collect it in a container;

[0063] (3) Cool the concentrated Rosa roxburghii Tratt juice in the container, and then perform high-energy ultrasonic sterilization to obtain sterile concentrated clarified Rosa roxburghii Tratt juice.

[0064] Example 1:

[0065] This example proposes a low-temperature extraction method for preparing Rosa roxburghii Tratt fine powder, including the following steps:

[0066] S1: Select fresh and plump Rosa roxburghii Tratt, wash, remove seeds, and dry the surface moisture for later use;

[0067] S2: Crush the washed Rosa roxburghii Tratt in S1 into Rosa roxburghii Tratt pieces, and then juice it through a screw juicer. Among them, the rotation speed of the screw juicer is 45 RPM, filter to obtain Rosa roxburghii Tratt juice, and then separate the juice in the Rosa roxburghii Tratt residue through a high-speed centrifuge to further improve the juice yield;

[0068] S3: Put the Rosa roxburghii Tratt juice obtained in S2 into a steam concentration device for concentration treatment to obtain concentrated clarified Rosa roxburghii Tratt juice;

[0069] S4: Add maltodextrin powder or water-soluble starch to the clarified Rosa roxburghii Tratt juice in S3, and fully stir it through a mixing device until it is completely dissolved. The stirring speed is 50 RPM, and the stirring time is 30 minutes. Filter to obtain a mixed clarified liquid;

[0070] S5: Start the air purification element of the atomization device to filter and sterilize the air inside the atomization device to obtain sterile and dust-free clean air. The air is filtered by a 0.3μm filter, and an ultraviolet lamp is installed on the filter screen to kill the bacteria attached to the filter screen, making the filtered air sterile and dust-free;

[0071] S6: Then start the cooling element of the atomization device to cool the clean air in S5 to 5°C to obtain air with a saturated moisture content of 0.9%;

[0072] S7: Start the heating element of the atomization device to heat the air obtained in S6 to 59°C to obtain hot and dry air. The saturated moisture content of the air at this temperature is 13% and the relative humidity is 8%. Then send the hot and dry air into the spray evaporation chamber to evaporate the atomized original juice of Rosa roxburghii tratt;

[0073] S8: Import the mixed clarified liquid in S4 into the spray evaporation chamber of the atomization device for atomization. The atomized mixed clarified liquid instantaneously evaporates in the spray evaporation chamber with a relative humidity of 8%. The air humidity in the spray evaporation chamber is far from reaching the saturation level, and the Rosa roxburghii tratt fine powder formed by dehydration of the atomized Rosa roxburghii tratt juice is quickly dried;

[0074] S9: Send the dried Rosa roxburghii tratt fine powder in S8 into the cyclone collector with the hot air for solid-gas separation and collect the Rosa roxburghii tratt fine powder. At the same time, introduce cold air at -1°C into the bottom of the cyclone collector to cool the Rosa roxburghii tratt fine powder to ensure that the nutritional components of the fine powder do not lose;

[0075] S10: Send the Rosa roxburghii tratt fine powder obtained in S9 into the vacuum drying chamber for further drying to obtain dry fine powder. The temperature of the vacuum drying chamber is 30°C and the drying duration is 6 hours;

[0076] S11: Screen and loosen the dry fine powder in S9 through a screening device. The screen of the screening device is 220 meshes to make the dry fine powder evenly dispersed and facilitate rapid dissolution during taking;

[0077] S12: Package the dry fine powder in S11 into small units suitable for the demand.

[0078] Example 2:

[0079] This example proposes a low-temperature extraction method for preparing Rosa roxburghii tratt fine powder, including the following steps:

[0080] S1: Select fresh and plump Rosa roxburghii tratt, wash, remove seeds, and dry the surface moisture for standby;

[0081] S2: Crush the washed Rosa roxburghii tratt in S1 into Rosa roxburghii tratt pieces, and then juice through a screw juicer. Among them, the rotation speed of the screw juicer is 60 RPM to filter out Rosa roxburghii tratt juice. The filtered Rosa roxburghii tratt residue is further separated from the juice in the Rosa roxburghii tratt residue by a high-speed centrifuge to further improve the juice yield;

[0082] S3: Put the rosa roxburghii juice obtained in S2 into a steam concentration device for concentration treatment to obtain concentrated clarified rosa roxburghii juice;

[0083] S4: Add maltodextrin powder or water-soluble starch to the clarified rosa roxburghii juice in S3, and fully stir it through a mixing device until it is completely dissolved. The stirring speed is 120 RPM, and the stirring time is 25 minutes. Then filter to obtain a mixed clarified liquid;

[0084] S5: Start the air purification element of the atomization device, filter and sterilize the air inside the atomization device to obtain sterile and dust-free clean air. The air is filtered through a 0.3μm filter, and an ultraviolet lamp is installed on the filter screen to kill the bacteria attached to the filter screen, making the filtered air sterile and dust-free;

[0085] S6: Then start the cooling element of the atomization device to cool the clean air in S5 to 4°C to obtain air with a saturated moisture content of 1.0%;

[0086] S7: Start the heating element of the atomization device to heat the air obtained in S6 to 60°C to obtain hot dry air. The saturated moisture content of the air at this temperature is 12%, and the relative humidity is 7%. Then send the hot dry air into the spray evaporation chamber to evaporate the atomized original rosa roxburghii juice;

[0087] S8: Introduce the mixed clarified liquid in S4 into the spray evaporation chamber of the atomization device for atomization. The atomized mixed clarified liquid instantaneously evaporates in the spray evaporation chamber with a relative humidity of 7%. The air humidity in the spray evaporation chamber is far from reaching the saturation level, and the atomized rosa roxburghii juice dehydrates to form rosa roxburghii fine powder, which is quickly dried;

[0088] S9: Send the dried rosa roxburghii fine powder in S8 into the cyclone collector with the hot air for solid-gas separation and collect the rosa roxburghii fine powder. At the same time, introduce cold air at -2°C into the bottom of the cyclone collector to cool the rosa roxburghii fine powder to ensure that the nutritional components of the fine powder do not lose;

[0089] S10: Send the rosa roxburghii fine powder obtained in S9 into a vacuum drying chamber for further drying to obtain dry fine powder. The temperature of the vacuum drying chamber is 30°C, and the drying duration is 7 hours;

[0090] S11: Sieve and loosen the dry fine powder in S9 through a screening device. The screen mesh of the screening device is 260 meshes to make the dry fine powder evenly dispersed, facilitating quick dissolution during taking;

[0091] S12: Pack the dry fine powder in S11 into small units suitable for the needs.

[0092] Example 3:

[0093] This embodiment proposes a low-temperature extraction method for preparing rose roxburghii tratt fine powder, which includes the following steps:

[0094] S1: Select fresh and plump rose roxburghii tratt, wash, remove seeds, and dry the surface moisture for later use;

[0095] S2: Crush the washed rose roxburghii tratt in S1 into pieces, and then juice it through a screw juicer. Among them, the rotation speed of the screw juicer is 80 RPM, and the rose roxburghii tratt juice is filtered out. The remaining rose roxburghii tratt residue is further separated from the juice in the residue through a high-speed centrifuge to further improve the juice yield;

[0096] S3: Put the rose roxburghii tratt juice obtained in S2 into a steam concentration device for concentration treatment to obtain concentrated clarified rose roxburghii tratt juice;

[0097] S4: Add maltodextrin powder or water-soluble starch to the clarified rose roxburghii tratt juice in S3, and fully stir it through a mixing device until it is completely dissolved. The stirring speed is 200 RPM, and the stirring time is 20 minutes. Then filter to obtain a mixed clarified liquid;

[0098] S5: Start the air purification element of the atomization device, filter and sterilize the air inside the atomization device to obtain sterile and dust-free clean air. The air is filtered through a 0.3μm filter, and an ultraviolet lamp is installed on the filter screen to kill the bacteria attached to the filter screen, making the filtered air sterile and dust-free;

[0099] S6: Then start the cooling element of the atomization device to cool the clean air in S5 to below 3°C to obtain air with a saturated moisture content of 1.2%;

[0100] S7: Start the heating element of the atomization device to heat the air obtained in S6 to 61°C to obtain hot dry air. The saturated moisture content of the air at this temperature is 11%, and the relative humidity is 6%. Then send the hot dry air into the spray evaporation chamber to evaporate the atomized original rose roxburghii tratt juice;

[0101] S8: Import the mixed clarified liquid in S4 into the spray evaporation chamber of the atomization device for atomization. The atomized mixed clarified liquid instantaneously evaporates in the spray evaporation chamber with a relative humidity of 6%. The air humidity in the spray evaporation chamber is far from reaching the saturation level, and the atomized rose roxburghii tratt juice is dehydrated to form rose roxburghii tratt fine powder, which is quickly dried;

[0102] S9: Send the dried rose roxburghii tratt fine powder in S8 into the cyclone collector with the hot air for solid-gas separation and collect the rose roxburghii tratt fine powder. At the same time, introduce cold air at -3°C into the bottom of the cyclone collector to cool the rose roxburghii tratt fine powder to ensure that the nutritional components of the fine powder do not lose;

[0103] S10: Feed the Rosa roxburghii Tratt fine powder obtained in S9 into a vacuum drying chamber for further drying to obtain dry fine powder. The temperature of the vacuum drying chamber is 30 °C and the drying duration is 8 hours;

[0104] S11: Screen and loosen the dry fine powder obtained in S9 using a screening device with a 300-mesh screen to evenly disperse the dry fine powder for rapid dissolution during taking;

[0105] S12: Package the dry fine powder in S11 into small units suitable for the requirements.

[0106] Comparative example:

[0107] This comparative example presents a low-temperature extraction method for preparing Rosa roxburghii Tratt fine powder, including the following steps:

[0108] S1: Select fresh and plump Rosa roxburghii Tratt, wash, remove seeds, and dry the surface moisture for later use;

[0109] S2: Crush the washed Rosa roxburghii Tratt in S1 into Rosa roxburghii Tratt pieces, and then juice them using a screw juicer. Among them, the rotation speed of the screw juicer is 60 RPM. Filter to obtain Rosa roxburghii Tratt juice, and then use a high-speed centrifuge to separate the juice from the Rosa roxburghii Tratt residue to further improve the juice yield;

[0110] S3: Put the Rosa roxburghii Tratt juice obtained in S2 into a steam concentration device for concentration treatment to obtain concentrated clarified Rosa roxburghii Tratt juice;

[0111] S4: Add maltodextrin powder or water-soluble starch to the clarified Rosa roxburghii Tratt juice in S3, and fully stir it using a mixing device until it is completely dissolved. The stirring speed is 120 RPM, and the stirring time is 25 minutes. Filter to obtain a mixed clarified liquid;

[0112] S5: Start the air purification element of the atomization device to filter and sterilize the air inside the atomization device to obtain sterile and dust-free clean air. The air is filtered using a 0.3-μm filter, and an ultraviolet lamp is installed on the filter mesh to kill the bacteria attached to the filter mesh, making the filtered air sterile and dust-free;

[0113] S6: Then start the cooling element of the atomization device to cool the clean air in S5 to 4 °C to obtain air with a saturated moisture content of 1.0%;

[0114] S7: Start the heating element of the atomization device to heat the air obtained in S6 to 60 °C to obtain hot dry air. The saturated moisture content of the air at this temperature is 12% and the relative humidity is 7%. Then send the hot dry air into the spray evaporation chamber to evaporate the atomized original Rosa roxburghii Tratt juice;

[0115] S8: Introduce the mixed clarifying liquid in S4 into the spray evaporation chamber of the atomization device for atomization. The atomized mixed clarifying liquid instantaneously evaporates in the spray evaporation chamber with a relative humidity of 7%. The air humidity in the spray evaporation chamber is far from reaching the saturation level, and the roselle powder formed by dehydration of the atomized roselle juice is quickly dried;

[0116] S9: Screen and loosen the dry powder in S8 through a screening device. The screen of the screening device is 260 mesh, so that the dry powder is evenly dispersed, facilitating rapid dissolution during taking;

[0117] S10: Package the dry powder in S9 into small units suitable for the needs.

[0118] Experimental test example one:

[0119] Conduct moisture tests on the roselle powder obtained in Example 1, Example 2, Example 3 and the comparative example respectively. The specific steps are as follows:

[0120] (1) Take 10 g of the roselle powder obtained in Example 1, Example 2, Example 3 and the comparative example respectively and place them in four containers;

[0121] (2) Then place the roselle powder in the four containers in a drying oven and dry it to a constant weight;

[0122] (3) Take out the dried samples from the oven, place them in a desiccator and cool them to room temperature, and then weigh them;

[0123] (4) Calculate the moisture content in the samples according to the mass difference before and after drying. The calculation formula is:

[0124]

[0125] The calculation results are as shown in the Figure 1 table. It can be seen from Figure 1 that as the vacuum drying time prolongs, the moisture content of the roselle powder is lower. This shows that vacuum drying can effectively ensure that the moisture in the produced roselle powder is greatly reduced, which is beneficial to the long-term preservation of the roselle powder.

[0126] Experimental test example two:

[0127] Determine the vitamin C content of the roselle powder obtained in Example 1, Example 2, Example 3 and the comparative example respectively according to the method specified in GB 5009.86-2016. The determination results are as shown in the Figure 2 table;

[0128] It can be seen from as shown in Figure 2It can be seen that the lower the temperature of the cold air introduced through the bottom of the cyclone collector, the higher the content of vitamin C retained in the Rosa roxburghii Tratt fine powder. This indicates that after atomization drying of the Rosa roxburghii Tratt fine powder, cooling the powder with cold air can ensure that the nutritional components of the fine powder do not lose, greatly improving the content of nutritional components in the Rosa roxburghii Tratt fine powder.

[0129] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-temperature extraction method for preparing Rosa roxburghii powder, characterized in that: The steps include: S1: Select fresh and plump sea roxburghii, wash, remove the seeds, blow dry the surface moisture, and set aside; S2: crushing the washed roxburghii in S1 into roxburghii blocks, then juicing, filtering to obtain roxburghii juice, and separating the juice from the roxburghii residue through a high-speed centrifuge to further improve the juice yield; S3: putting the roxburghii juice obtained in S2 into a steam concentration device for concentration treatment to obtain concentrated clarified roxburghii juice; S4: adding maltodextrin powder or water-soluble starch to the clarified roxburghii juice in S3, stirring thoroughly to completely dissolve the maltodextrin powder or water-soluble starch, and filtering to obtain a mixed clarified liquid; S5: Start the air purification element of the atomizing device to filter and sterilize the air inside the atomizing device to obtain sterile and dust-free clean air; S6: Then start the cooling element of the atomizing device to cool the clean air in S5 to below 6°C, obtaining air with a saturated moisture content of 0.9%-1.2%; S7: Start the heating element of the atomization equipment to heat the air obtained in S6 to 60±1°C to obtain hot dry air, the saturated moisture content of the air at this temperature is 11%-13%, and the relative humidity is 6%-8%, and then send the hot dry air into the spray evaporation chamber to evaporate the atomized roxburghii juice; S8: introducing the mixed clarified liquid in S4 into a spray evaporation chamber of an atomizing device for atomization, wherein the atomized mixed clarified liquid evaporates instantly in the spray evaporation chamber where the relative humidity is less than 8%, and the air humidity in the spray evaporation chamber is far from saturation, and the atomized roxburghii juice is dehydrated to form roxburghii powder, which is quickly dried; S9: sending the dried roxburghii powder in S8 into a cyclone collector along with hot air for solid-gas separation and collecting the roxburghii powder, while introducing cold air below 0° C. into the bottom of the cyclone collector to cool the roxburghii powder to ensure that the nutrients of the powder are not lost; S10: sending the Rosa roxburghii powder obtained in S9 into a vacuum drying chamber for further drying to obtain dry powder; S11: The dry powder of S9 is sieved through a sieving device to make the dry powder evenly dispersed for quick dissolution when taken; S12: Pack the dry fine powder in S11 into small units that meet the needs.

2. The low-temperature extraction method for preparing a Rosa roxburghii powder according to claim 1, characterized in that: In S2, the broken roxburghii pieces are juiced by a screw juicer, wherein the rotation speed of the screw juicer is 45-80 RPM.

3. The low-temperature extraction method for preparing a Rosa roxburghii powder according to claim 1, characterized in that: In S2, the filtering process of the juicing sea buckthorn juice is as follows: (1) Preliminarily filter the squeezed roxburghii juice through a coarse screen or gauze to remove larger solid particles and impurities; (2) The initially filtered sea buckthorn juice is then finely filtered through a finer mesh, filter paper or filter membrane to remove fine particles, suspended matter and possible microorganisms in the juice to obtain clear and transparent sea buckthorn juice.

4. The low-temperature extraction method for preparing a Rosa roxburghii powder according to claim 1, characterized in that: In S2, the high-speed centrifuge centrifuge is used to centrifuge the roxburghii residue. The specific parameters are: a rotation speed of 15000-16000 r / min, a relative centrifugal force of (17800-18000)×g, and a temperature of -20°C -40°C.

5. The low-temperature extraction method for preparing a Rosa roxburghii powder according to claim 1, characterized in that: In S2, the specific steps of concentrating the roxburghii juice are as follows: (1) First, the roxburghii juice is fed into the steam concentration device, and then the heating element is started to heat it, and the temperature is controlled at 120° C.-130° C., so that the water in the roxburghii juice begins to evaporate and form water vapor; (2) As the water in the roxburghii juice evaporates, the roxburghii juice gradually concentrates and the concentration increases, and then the concentrated roxburghii juice is discharged from the concentration device and collected in a container; (3) Cooling the concentrated sea buckthorn juice in the container, and then sterilizing it with high-energy ultrasonic wave to obtain sterile concentrated clarified sea buckthorn juice.

6. The low-temperature extraction method for preparing a Rosa roxburghii powder according to claim 1, characterized in that: In S4, the amount of maltodextrin powder or water-soluble starch added is based on the solid content of the roxburghii juice, and the ratio of the solid content to the maltodextrin powder or water-soluble starch is 7:4-4.

5.

7. The low-temperature extraction method for preparing a Rosa roxburghii powder according to claim 6, characterized in that: In S4, maltodextrin powder or water-soluble starch is mixed with clarified roxburghii juice by a mixing device at a stirring speed of 50-200 RPM for 20-30 minutes.

8. The low-temperature extraction method for preparing a Rosa roxburghii powder according to claim 1, characterized in that: In S5, the air is filtered with a 0.3 μm filter, and an ultraviolet lamp is installed on the filter to kill bacteria attached to the filter, making the filtered air sterile and dust-free.

9. The low-temperature extraction method for preparing a Rosa roxburghii powder according to claim 1, characterized in that: In S10, the temperature of the vacuum drying chamber is 30°C, and the drying time is 6-8 hours.

10. The low-temperature extraction method for preparing a Rosa roxburghii powder according to claim 1, characterized in that: In S11, the screen of the screening device is 220-300 mesh.

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