Spray drying process of dendrobium officinale solid beverage

Abstract

According to the spray drying process of the dendrobium officinale solid beverage, provided by the invention, a stable protective layer is formed on the surface of powder through the synergistic effect of diding gum and sunflower lecithin, so that the flowability and anti-caking property of the product are improved, and instantaneous heating is realized in combination with optimized drying kinetics; the problems that in the spray drying process, active ingredients are prone to degradation, and products are prone to adhering to walls and caking are solved, and finally the solid beverage product which is high in active ingredient retention rate, excellent in solubility and stable in quality is obtained.

Description

Technical Field

[0001] This invention belongs to the field of solid beverage and food technology, and specifically relates to a spray drying process for Dendrobium officinale solid beverage. Background Technology

[0002] Dendrobium officinale, a precious traditional Chinese medicine, is rich in polysaccharides, flavonoids, and other bioactive components, possessing various physiological functions such as enhancing immunity and anti-oxidation, making it highly sought after in the market. Developing it into solid beverage forms, such as powders or granules, is an important way to achieve convenient consumption, easy storage, and easy transportation. Among various powder processing technologies, spray drying technology has become one of the preferred methods for preparing plant extract solid beverages due to its significant advantages such as instantaneous drying, high production efficiency, and ease of continuous operation.

[0003] However, applying spray drying technology to materials like Dendrobium officinale, which are rich in sugars and heat-sensitive active ingredients, presents several challenges. Firstly, during the spray drying process itself, Dendrobium officinale extract, due to its high sugar and viscosity, is prone to sticking to the drying tower walls and clumping. This adhesion not only reduces product yield and increases cleaning burden but also causes the sticky material to caramelize and deteriorate due to prolonged heating, affecting the color and flavor of the entire batch. Simultaneously, the dried powder product is prone to absorbing moisture and clumping, exhibiting poor flowability, which greatly inconveniences packaging, storage, and consumer use. Furthermore, the powder formed after drying high-sugar materials typically has poor solubility, easily forming difficult-to-disperse clumps in water, severely impacting the "instant dissolution" of solid beverages.

[0004] To address the aforementioned issues of adhesion and clumping, the commonly used solution in existing technologies is to add large amounts of drying aids, such as maltodextrin and β-cyclodextrin. These excipients effectively improve the drying characteristics of the material and increase the flowability of the powder. However, this method has drawbacks: the addition of large amounts of inert excipients significantly dilutes the active ingredients of Dendrobium officinale itself, resulting in an excessively low content of effective ingredients in the final product and a significant reduction in efficacy. Furthermore, in terms of improving solubility, conventional methods often focus on adding a single emulsifier or anti-caking agent, such as the commonly used lecithin. However, a single additive cannot simultaneously achieve both anti-caking and rapid solubility. For example, while hydrophobic lecithin can improve flowability, excessive use may hinder the rapid wetting and dispersion of the powder in water, negatively impacting rapid solubility. Therefore, achieving a balance and synergy between anti-caking and rapid solubility through the compounding technology of excipients is an important direction for improving product quality.

[0005] Finally, conventional spray drying process parameters (such as inlet air temperature and atomization pressure) are often set based on general experience and fail to fully consider the heat-sensitive characteristics of Dendrobium officinale active substances. Excessively high inlet air temperature or improper atomization effect will cause the droplets to actually bear too much thermal stress during the drying process, resulting in irreversible loss of active ingredients.

[0006] In summary, developing a process that can synergistically solve these problems, simultaneously achieving high retention of active ingredients, low processing loss, excellent physical properties, and outstanding solubility in Dendrobium officinale solid beverage products without relying on large amounts of dilutive excipients, is of paramount importance for improving the technological level and product competitiveness in this field. This is precisely the core problem that this invention aims to solve. Summary of the Invention

[0007] This invention discloses a spray drying process for Dendrobium officinale solid beverages to solve any of the above-mentioned or potential problems in the prior art. To solve the above-mentioned technical problems, the specific steps of this application are as follows:

[0008] (1) Mixing and homogenization of auxiliary materials: Add stabilizer and anti-caking agent to Dendrobium officinale concentrate with soluble solids content of 30%, shear emulsify and stir, then homogenize under high pressure, and finally pass through a 100-mesh sieve to obtain the liquid.

[0009] The stabilizer is Dingyou gum, and the amount added is 0.03% to 0.06% of the mass of Dendrobium officinale concentrate.

[0010] (2) Spray drying: The obtained liquid is spray dried using a centrifugal atomizer. The atomization angle of the centrifugal atomizer is 60°, the atomizer speed is 18000-20000 r / min, the inlet air temperature is controlled at 160℃ to 170℃, and the outlet air temperature is controlled at 75-80℃. The dried powder is collected to obtain the Dendrobium officinale solid beverage.

[0011] The anti-caking agent is sunflower lecithin, and the amount added is 0.2% to 0.3% of the concentrate mass.

[0012] The mixing method for adding stabilizer and anti-caking agent to Dendrobium officinale concentrate with soluble solids content of 30% in step (1) is as follows: take 10-15% of the total mass of Dendrobium officinale concentrate, preheat it to 53-57℃, add anti-caking agent, and shear disperse at 10000-12000rpm for 5-8min, then add stabilizer, shear at 10000-12000rpm for 8-10min, control the temperature at 58-62℃ to obtain premixed liquid, add premixed liquid to the remaining concentrate, mix at 300-400rpm for 15-20min, and then perform the high pressure homogenization treatment.

[0013] In step (1), the high-pressure homogenization process is carried out by two-stage homogenization. The first-stage homogenization pressure is 20-25 MPa, the second-stage homogenization pressure is 3-5 MPa, and the homogenization is repeated twice, with a total time of 5-8 min.

[0014] The aforementioned Dendrobium officinale solid beverage also includes barley grass powder and Litsea cubeba extract, wherein the mass addition ratio of barley grass powder: Litsea cubeba extract: Dendrobium officinale is (10-25):(5-15):100.

[0015] The advantages and beneficial effects of this invention are as follows:

[0016] 1. The spray drying process for Dendrobium officinale solid beverage of the present invention effectively solves the technical problems commonly found in the prior art during processing, such as large loss of active ingredients, easy adhesion and clumping of products, and poor solubility, through a series of synergistic optimization techniques, and significantly improves the quality and stability of the final product.

[0017] 2. In the core pre-drying treatment stage, a compound system of iodized gum and sunflower lecithin was used as a processing aid. Sunflower lecithin, as the core anti-caking agent, has an amphiphilic molecular structure that can uniformly coat the surface of the powder particles to be formed, greatly reducing the adsorption force and surface stickiness between particles. This effectively prevents the material from adhering to the tower wall during the drying process and ensures that the final powder product has excellent flowability, laying a solid foundation for obtaining a loose, non-caking physical property. However, relying solely on sunflower lecithin may introduce the following problems: due to its hydrophobic properties, excessive addition can sometimes affect the rapid wetting and dispersion of the powder in water, thus potentially adversely affecting the product's "instant solubility".

[0018] 3. To address the aforementioned issues, the introduction of the eugenol plays a crucial complementary and enhancing role. As a hydrophilic colloid, the eugenol can coat the surface of powder particles, improving the overall hydrophilicity of the system and counteracting the hydrophobic effect that sunflower lecithin may introduce, thus jointly enhancing wetting efficiency. Simultaneously, it rapidly forms a viscous solution after reconstitution, effectively suspending insoluble particles in the product and improving reconstitution uniformity and mouthfeel. The key to this invention lies in precisely controlling the concentration of the eugenol at a low level (e.g., an addition amount of 0.03%-0.06% of the system). At this concentration, it does not form a dense gel film during drying, but rather a fragile, loose microscopic skeletal network. This structure creates numerous micropores within the powder, allowing water molecules to rapidly penetrate into the particles during reconstitution, achieving rapid wetting and disintegration from the inside out, thereby indirectly and effectively promoting rapid dissolution.

[0019] 4. Precise control of the amount of precipitant added is the core of this process. If the amount added is less than 0.03%, although it can still improve the hydrophilicity of the system to some extent and counteract the hydrophobic effect of sunflower lecithin, the resulting microstructure is too weak to effectively build sufficient channels to significantly improve the water penetration rate, thus limiting the improvement in solubility. Conversely, if the amount added is slightly excessive, such as greater than 0.06%, the precipitant's characteristics as a colloid will become prominent. During drying, molding, and subsequent mixing, it will form an overly tough and dense gel network structure around the powder particles. This dense structure will not only act as a "barrier" to severely hinder water wetting and penetration, leading to a sharp decrease in solubility and the appearance of surface clumping and internal dry powder, but also this excessive tendency to gel will damage the physical integrity of the powder particles, weakening their flowability and thus greatly reducing the anti-caking advantage of sunflower lecithin. Therefore, by precisely controlling the amount of the optimal adhesive added, this invention can fully leverage the positive effect of constructing a porous structure to promote rapid dissolution while reducing its potential negative risk of gelation. This is an important step in achieving a product that combines anti-caking properties and rapid dissolution.

[0020] 5. Finally, in the spray drying stage, by precisely matching the high speed of the centrifugal atomizer, the specific atomization angle, and the optimized inlet and outlet air temperatures, the liquid material is atomized into fine droplets of uniform size. This process ensures that the moisture is removed quickly while keeping the actual heating temperature and time of the material to a minimum, thereby protecting the active substances of Dendrobium officinale from high-temperature damage to the greatest extent. Attached Figure Description

[0021] Figure 1 This is the high-performance liquid chromatogram of Example 1.

[0022] Figure 2 This is the high-performance liquid chromatogram of Example 2.

[0023] Figure 3 This is the high-performance liquid chromatogram of Example 3.

[0024] Figure 4 This is the high performance liquid chromatogram of Comparative Example 1.

[0025] Figure 5 This is the high performance liquid chromatogram of Comparative Example 2.

[0026] Figure 6 This is the high performance liquid chromatogram of Comparative Example 3.

[0027] Figure 7 This is the high performance liquid chromatogram of Comparative Example 4.

[0028] Figure 8 This is the high performance liquid chromatogram of Comparative Example 5.

[0029] Figure 9 This is the high performance liquid chromatogram of Comparative Example 6.

[0030] Figure 10 This is the high performance liquid chromatogram of Comparative Example 7.

[0031] Figure 11 This is the high performance liquid chromatogram of Comparative Example 8.

[0032] Figure 12 This is the high performance liquid chromatogram of Comparative Example 9. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the embodiments. The dermal filler used below was purchased from Sichuan Huanxu Biotechnology Co., Ltd., CAS number 9000-30-0, and is a polysaccharide extracted from guar bean seeds. The Dendrobium officinale concentrate used below includes the following treatments:

[0034] Raw material pretreatment: Fresh Dendrobium officinale stems and flowers were mixed at a mass ratio of 7:3, washed and crushed, and 10 times the weight of water was added to adjust the pH to 5.0. A compound enzyme preparation was added, and the mixture was enzymatically hydrolyzed at 60℃ for 2 hours. Then, the temperature was raised to 95℃ to inactivate the enzyme for 10 minutes. The mixture was filtered to obtain Dendrobium officinale extract. The compound enzyme preparation consisted of cellulase and β-mannanase. The amount of cellulase added was 0.3% of the weight of the Dendrobium officinale stem and flower mixture, and the amount of β-mannanase added was 0.2% of the weight of the Dendrobium officinale stem and flower mixture.

[0035] Extract concentration: The obtained Dendrobium officinale extract was concentrated under vacuum at a vacuum degree of -0.08MPa and a temperature of 55℃ until the soluble solids content was 30%, thus obtaining Dendrobium officinale concentrate;

[0036] Example 1

[0037] (1) Mixing and homogenization of auxiliary materials: Take 12% of the total mass of Dendrobium officinale concentrate from 1000g Dendrobium officinale concentrate, preheat it to 55℃, add sunflower lecithin, the amount added is 0.25% of the total mass of concentrate, and disperse it at high speed of 11000rpm for 6min. Then add the precipitate, the amount added is 0.05% of the total mass of concentrate, and shear at 11000rpm for 9min, and control the temperature at 60℃ to obtain a premixed liquid. Add the premixed liquid to the remaining concentrate and mix it at a stirring speed of 350rpm for 18min. Then perform two high-pressure homogenization treatments. The first homogenization pressure is 22MPa and the second homogenization pressure is 4MPa. Homogenize twice for a total time of 6min. Finally, pass it through a 100-mesh sieve to obtain the liquid.

[0038] (2) Spray drying: The obtained liquid is spray dried using a centrifugal atomizer. The atomization angle of the centrifugal atomizer is 60°, the atomizer speed is 19000r / min, the inlet air temperature is controlled at 165℃, and the outlet air temperature is controlled at 78℃. The dried powder is collected to obtain the Dendrobium officinale solid beverage.

[0039] Example 2

[0040] (1) Mixing and homogenization of auxiliary materials: Take 15% of the total mass of Dendrobium officinale concentrate from 1000g Dendrobium officinale concentrate, preheat it to 53℃, add sunflower lecithin, the amount added is 0.2% of the total mass of concentrate, and shear disperse at 10000rpm for 8min. Then add the precipitate, the amount added is 0.03% of the total mass of concentrate, shear at 12000rpm for 8min, and control the temperature at 62℃ to obtain a premixed liquid. Add the premixed liquid to the remaining concentrate and mix at 300rpm for 20min. Then perform two high-pressure homogenization treatments. The first homogenization pressure is 20MPa and the second homogenization pressure is 5MPa. Homogenize twice for a total time of 5min. Finally, pass through a 100-mesh sieve to obtain the liquid.

[0041] (2) Spray drying: The obtained liquid is spray dried using a centrifugal atomizer. The atomization angle of the centrifugal atomizer is 60°, the atomizer speed is 20000r / min, the inlet air temperature is controlled at 160℃, and the outlet air temperature is controlled at 75℃. The dried powder is collected to obtain the Dendrobium officinale solid beverage.

[0042] Example 3

[0043] (1) Mixing and homogenization of auxiliary materials: Take 10% of the total mass of Dendrobium officinale concentrate from 1000g Dendrobium officinale concentrate, preheat it to 57℃, add sunflower lecithin, the amount added is 0.3% of the total mass of concentrate, and disperse it at high speed of 12000rpm for 5min. Then add the precipitate, the amount added is 0.06% of the total mass of concentrate, and shear at 10000rpm for 10min, and control the temperature at 58℃ to obtain a premixed liquid. Add the premixed liquid to the remaining concentrate and mix it at a stirring speed of 400rpm for 15min. Then perform two high-pressure homogenization treatments. The first homogenization pressure is 25MPa and the second homogenization pressure is 3MPa. Cycle homogenize twice for a total time of 8min. Finally, pass it through a 100-mesh sieve to obtain the liquid.

[0044] (2) Spray drying: The obtained liquid is spray dried using a centrifugal atomizer. The atomization angle of the centrifugal atomizer is 60°, the atomizer speed is 18000r / min, the inlet air temperature is controlled at 170℃, and the outlet air temperature is controlled at 80℃. The dried powder is collected to obtain the Dendrobium officinale solid beverage.

[0045] Comparative Example 1

[0046] (1) Mixing and homogenization of excipients: Take 1000g of Dendrobium officinale concentrate and preheat it to 55℃. Add sunflower lecithin at a concentration of 0.25% of the concentrate mass. Shear and disperse at 11000rpm for 6min. Then add the gluten at a concentration of 0.05% of the concentrate mass. Shear at 11000rpm for 9min and control the temperature at 60℃. Mix at 350rpm for 18min. Then homogenize twice under high pressure. The first homogenization pressure is 22MPa and the second homogenization pressure is 4MPa. Homogenize twice for a total time of 6min. Finally, pass through a 100-mesh sieve to obtain the liquid.

[0047] (2) Spray drying: The obtained liquid is spray dried using a centrifugal atomizer. The atomization angle of the centrifugal atomizer is 60°, the atomizer speed is 19000r / min, the inlet air temperature is controlled at 165℃, and the outlet air temperature is controlled at 78℃. The dried powder is collected to obtain the Dendrobium officinale solid beverage.

[0048] Comparative Example 2

[0049] The difference between this comparative example and Example 1 is that sunflower lecithin is replaced with lecithin in this comparative example; otherwise, it is the same as in Example 1.

[0050] Comparative Example 3

[0051] (1) Mixing and homogenization of auxiliary materials: Take 12% of the total mass of Dendrobium officinale concentrate from 1000g Dendrobium officinale concentrate, preheat it to 55℃, add sunflower lecithin, the amount added is 0.5% of the total mass of concentrate, and disperse it at high speed of 11000rpm for 6min. Then add the precipitate, the amount added is 0.05% of the total mass of concentrate, and shear at 11000rpm for 9min, and control the temperature at 60℃ to obtain a premixed liquid. Add the premixed liquid to the remaining concentrate and mix at a stirring speed of 350rpm for 18min. Then perform two high-pressure homogenization treatments. The first homogenization pressure is 22MPa and the second homogenization pressure is 4MPa. Homogenize twice for a total time of 6min. Finally, pass through a 100-mesh sieve to obtain the liquid.

[0052] (2) Spray drying: The obtained liquid is spray dried using a centrifugal atomizer. The atomization angle of the centrifugal atomizer is 60°, the atomizer speed is 19000r / min, the inlet air temperature is controlled at 165℃, and the outlet air temperature is controlled at 78℃. The dried powder is collected to obtain the Dendrobium officinale solid beverage.

[0053] Comparative Example 4

[0054] (1) Mixing and homogenization of auxiliary materials: Take 12% of the total mass of Dendrobium officinale concentrate from 1000g Dendrobium officinale concentrate, preheat it to 55℃, add sunflower lecithin, the amount added is 0.1% of the total mass of concentrate, and disperse it at high speed of 11000rpm for 6min. Then add the precipitate, the amount added is 0.05% of the total mass of concentrate, and shear at 11000rpm for 9min, and control the temperature at 60℃ to obtain a premixed liquid. Add the premixed liquid to the remaining concentrate and mix it at a stirring speed of 350rpm for 18min. Then perform two high-pressure homogenization treatments. The first homogenization pressure is 22MPa and the second homogenization pressure is 4MPa. Homogenize twice for a total time of 6min. Finally, pass it through a 100-mesh sieve to obtain the liquid.

[0055] (2) Spray drying: The obtained liquid is spray dried using a centrifugal atomizer. The atomization angle of the centrifugal atomizer is 60°, the atomizer speed is 19000r / min, the inlet air temperature is controlled at 165℃, and the outlet air temperature is controlled at 78℃. The dried powder is collected to obtain the Dendrobium officinale solid beverage.

[0056] Comparative Example 5

[0057] The difference between this comparative example and Example 1 is that the precipitate is replaced with xanthan gum in this comparative example; otherwise, it is the same as Example 1.

[0058] Comparative Example 6

[0059] (1) Mixing and homogenization of auxiliary materials: Take 12% of the total mass of Dendrobium officinale concentrate from 1000g Dendrobium officinale concentrate, preheat it to 55℃, add sunflower lecithin, the amount added is 0.25% of the total mass of concentrate, and disperse it at high speed of 11000rpm for 6min. Then add the precipitate, the amount added is 0.10% of the total mass of concentrate, and shear at 11000rpm for 9min, and control the temperature at 60℃ to obtain a premixed liquid. Add the premixed liquid to the remaining concentrate and mix it at a stirring speed of 350rpm for 18min. Then perform two high-pressure homogenization treatments. The first homogenization pressure is 22MPa and the second homogenization pressure is 4MPa. Homogenize twice for a total time of 6min. Finally, pass it through a 100-mesh sieve to obtain the liquid.

[0060] (2) Spray drying: The obtained liquid is spray dried using a centrifugal atomizer. The atomization angle of the centrifugal atomizer is 60°, the atomizer speed is 19000r / min, the inlet air temperature is controlled at 165℃, and the outlet air temperature is controlled at 78℃. The dried powder is collected to obtain the Dendrobium officinale solid beverage.

[0061] Comparative Example 7

[0062] (1) Mixing and homogenization of auxiliary materials: Take 12% of the total mass of Dendrobium officinale concentrate from 1000g Dendrobium officinale concentrate, preheat it to 55℃, add sunflower lecithin, the amount added is 0.25% of the total mass of concentrate, and disperse it at high speed of 11000rpm for 6min. Then add the precipitate, the amount added is 0.02% of the total mass of concentrate, and shear at 11000rpm for 9min, and control the temperature at 60℃ to obtain a premixed liquid. Add the premixed liquid to the remaining concentrate and mix at a stirring speed of 350rpm for 18min. Then perform two high-pressure homogenization treatments. The first homogenization pressure is 22MPa and the second homogenization pressure is 4MPa. Homogenize twice for a total time of 6min. Finally, pass through a 100-mesh sieve to obtain the liquid.

[0063] (2) Spray drying: The obtained liquid is spray dried using a centrifugal atomizer. The atomization angle of the centrifugal atomizer is 60°, the atomizer speed is 19000r / min, the inlet air temperature is controlled at 165℃, and the outlet air temperature is controlled at 78℃. The dried powder is collected to obtain the Dendrobium officinale solid beverage.

[0064] Comparative Example 8

[0065] The difference between this comparative example and Example 1 is that the spray drying process is as follows: the obtained liquid is spray dried using a centrifugal atomizer with an atomization angle of 65°, a speed of 19000 r / min, an inlet air temperature of 165°, and an outlet air temperature of 78°. The dried powder is then collected to obtain the Dendrobium officinale solid beverage. The rest is the same as in Example 1.

[0066] Comparative Example 9

[0067] The difference between this comparative example and Example 1 is that the spray drying process is as follows: the obtained liquid is spray dried using a centrifugal atomizer with an atomization angle of 60°, a rotation speed of 19000 r / min, an inlet air temperature of 150°C, and an outlet air temperature of 70°C. The dried powder is then collected to obtain the Dendrobium officinale solid beverage; the rest is the same as in Example 1.

[0068] Based on the high performance liquid chromatograms of Examples 1-3 and Comparative Examples 1-9 ( Figure 1-12The data in Table 1 and Figure 2 are shown. In the figures, the peak area of ​​1 represents the mannose content, and the peak area of ​​2 represents the anhydrous glucose content. The contents of mannose and anhydrous glucose are higher in the optimized process examples (e.g., 6.38% mannose and 8.58% anhydrous glucose in Example 1), while they are generally lower in the comparative examples. This variation mainly stems from the impact of changes in process parameters on the retention of active ingredients. In the examples, the synergistic effect of the combination of the optimized gel and sunflower lecithin forms a stable protective layer on the powder surface. Combined with optimized spray drying parameters, instantaneous drying is achieved, minimizing heat exposure and effectively reducing the degradation of heat-sensitive polysaccharides. In contrast, any deviation from parameters in the comparative examples—such as inappropriate additive type (Comparative Examples 2 and 5), imbalanced addition amount (Comparative Examples 3, 4, 6, and 7), or suboptimal drying conditions (Comparative Examples 8 and 9)—can lead to wall adhesion, localized overheating, or dense powder structure, increasing the risk of thermal damage to active ingredients and ultimately reducing the retention rates of mannose and glucose.

[0069] Experiment 1: Determination of Physicochemical Indicators

[0070] Determination of moisture content

[0071] Refer to GB5009.3-2010 Direct Drying Method. For Examples 1-3 and Comparative Examples 1-9, 5g of sample was taken from each group for determination. Each group was tested 5 times, and the average value of the results was taken.

[0072] Determination of solubility

[0073] Refer to GB5413.29-2010 Determination of Solubility. For Examples 1-3 and Comparative Examples 1-9, 5g of sample was taken from each group for determination. Each group was tested 3 times, and the average value of the results was taken.

[0074] Determination of monosaccharide content

[0075] Dissolve 5g of sample in 50ml of water, and determine the contents of mannose and anhydrous glucose in Dendrobium officinale using high-performance liquid chromatography (HPLC). See the attached figure for the specific HPLC chromatogram. Figures 1-12 .

[0076] Protein content determination

[0077] Refer to GB5009.5-2016 Kjeldahl method for nitrogen determination. For Examples 1-3 and Comparative Examples 1-9, 5g of sample was taken from each group for determination. Each group was tested 3 times, and the average value of the results was taken.

[0078] The results are shown in Table 1 below.

[0079] Table 1

[0080] Group Moisture content (%) Solubility (g / 100g) Mannose (%) Anhydrous glucose (%) Protein content (g / 100g) Example 1 2.98 88.92 6.38 8.58 13.26 Example 2 3.05 87.45 4.46 6.36 13.19 Example 3 3.10 88.03 5.13 5.24 13.08 Comparative Example 1 4.14 78.64 3.84 2.92 12.78 Comparative Example 2 5.37 86.21 2.31 2.8 9.87 Comparative Example 3 3.65 86.40 2.45 6.18 12.84 Comparative Example 4 3.92 83.56 3.26 2.72 12.09 Comparative Example 5 4.41 82.35 2.35 3.4 9.94 Comparative Example 6 3.68 85.49 3.95 5.6 12.71 Comparative Example 7 3.74 81.27 2.82 3.25 12.09 Comparative Example 8 3.35 83.56 2.5 4.45 12.38 Comparative Example 9 3.61 84.08 4.35 4.55 12.49

[0081] Experiment 2: Anti-caking and instant solubility test

[0082] Angle of repose measurement

[0083] Refer to GB / T31057.2-2018. For Examples 1-3 and Comparative Examples 1-9, 100g of powder was taken from each group and allowed to flow freely through a funnel to form a cone. The angle between the base of the cone and the hypotenuse (angle of repose) was measured.

[0084] Dispersion time determination

[0085] Measure 20 mL of room temperature (25-30°C) deionized water into a beaker, place it on a magnetic stirrer, and stir at 200 rpm. Weigh 1 g of sample and pour it into the beaker. Observe how well the sample disperses in the water and record the time from when the sample first comes into contact with the water until it is completely dispersed in the water. This is the dispersion time.

[0086] The results are shown in Table 2 below.

[0087] Table 2

[0088] Group Angle of repose (°) Dispersion time (s) Example 1 22.87 22.7 Example 2 23.04 24.5 Example 3 23.28 24.9 Comparative Example 1 26.59 36.8 Comparative Example 2 34.72 33.6 Comparative Example 3 26.06 31.3 Comparative Example 4 30.25 28.5 Comparative Example 5 33.94 40.2 Comparative Example 6 35.84 37.4 Comparative Example 7 27.91 30.3 Comparative Example 8 25.84 27.9 Comparative Example 9 26.87 28.1

Claims

1. A spray drying process for a Dendrobium officinale solid beverage, characterized in that, Includes the following steps: (1) Mixing and homogenization of auxiliary materials: Add stabilizer and anti-caking agent to Dendrobium officinale concentrate with soluble solids content of 30%, shear emulsify and stir, then homogenize under high pressure, and finally pass through a 100-mesh sieve to obtain the liquid. The stabilizer is a precipitate; (2) Spray drying: The obtained liquid is spray dried using a centrifugal atomizer. The atomization angle of the centrifugal atomizer is 60°, the atomizer speed is 18000-20000 r / min, the inlet air temperature is controlled at 160℃ to 170℃, and the outlet air temperature is controlled at 75-80℃. The dried powder is collected to obtain the Dendrobium officinale solid beverage.

2. The spray drying process for Dendrobium officinale solid beverage according to claim 1, characterized in that, The amount of stabilizer added is 0.03% to 0.06% of the mass of Dendrobium officinale concentrate.

3. The spray drying process for Dendrobium officinale solid beverage according to claim 1, characterized in that, The anti-caking agent is sunflower lecithin, and the amount added is 0.2% to 0.3% of the concentrated liquid mass.

4. The spray drying process for Dendrobium officinale solid beverage according to claim 1, characterized in that, The mixing method for adding stabilizer and anti-caking agent to Dendrobium officinale concentrate with soluble solids content of 30% in step (1) is as follows: take 10-15% of the total mass of Dendrobium officinale concentrate, preheat it to 53-57℃, add anti-caking agent, and shear disperse at high speed of 10000-12000rpm for 5-8min, then add stabilizer, shear at 10000-12000rpm for 8-10min, control the temperature at 58-62℃ to obtain premixed liquid, add premixed liquid to the remaining concentrate, mix at stirring speed of 300-400rpm for 15-20min, and then perform the high pressure homogenization treatment.

5. The spray drying process for Dendrobium officinale solid beverage according to claim 1, characterized in that, The high-pressure homogenization process described in step (1) involves two-stage homogenization. The first-stage homogenization pressure is 20-25 MPa, and the second-stage homogenization pressure is 3-5 MPa. The homogenization is repeated twice, with a total time of 5-8 minutes.

6. A Dendrobium officinale solid beverage as described in any one of claims 1-5, characterized in that, The solid beverage also includes barley grass powder and Litsea cubeba extract, wherein the mass ratio of barley grass powder: Litsea cubeba extract: Dendrobium officinale is 10-25:5-15:100.

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