Glucose pellets, preparation method and use thereof

Abstract

The invention belongs to the field of biomedicine, and particularly relates to a glucose core, comprising a glucose and/or a glucose hydrate, a diluent and a binder, wherein, the glucose and/or the glucose hydrate is present in the glucose core in an amount of ≤85% by weight percentage; and relates to a glucose pellet comprising the glucose core and a laminated layer coating the glucose core; and further relates to a pharmaceutical composition comprising the glucose pellet. The glucose pellet or the pharmaceutical composition of the invention are useful in treatment and/or assistant treatment of a glycogen storage disease and/or a diabetes.

Claims

1. A glucose core comprising the following components: a glucose, and/or a glucose hydrate, a first additional agent as a diluent, and a second additional agent as a binder; wherein, the glucose and/or the glucose hydrate is present in the glucose core in an amount of <85% as calculated by weight percentage; the glucose and/or the glucose hydrate is a particle consisting of a size sieved through a mesh of 110, 120, 130, 140 or 150, as measured by Chinese National Standard sieves; and the glucose core has a particle diameter of 100 to 300 μm.

2. The glucose core according to claim 1, wherein the diluent comprises a microcrystalline cellulose, and optionally a starch; wherein the starch is present in the glucose core in an amount of 0% to 13% as calculated by weight percentage.

3. A glucose pellet comprising the glucose core according to claim 1, and a laminated layer coating the glucose core; wherein the laminated layer comprises the following components: a glucose, and/or a glucose hydrate, a first additional agent as a diluent, and a second additional agent as a binder.

4. The glucose pellet according to claim 3, wherein the glucose, and/or the glucose hydrate is present in the laminated layer in an amount greater than the amount of the glucose, and/or the glucose hydrate in the glucose core.

5. A glucose sustained-release pellet comprising the glucose pellet according to claim 3, and a sustained-release coating on the glucose pellet; wherein the sustained-release coating comprises a first agent as a porogen, a second agent as a film-forming agent, and a third agent as a plasticizer.

6. The glucose sustained-release pellet according to claim 5, wherein, as calculated by weight percentage, the film-forming agent is present in the sustained-release coating in an amount of 60% to 80%; the porogen is present in the sustained-release coating in an amount of 8% to 20%; and, the plasticizer is present in the sustained-release coating in an amount of 10% to 23%.

7. A method for preparing the glucose core according to claim 1, comprising the following steps: (1-1) mixing a glucose, and/or a glucose hydrate particle consisting of a size sieved through a mesh of 110, 120, 130, 140 or 150, with a first additional agent as a diluent to obtain a mixture 1; (1-2) dissolving a second additional agent as a binder in a solvent to form a binder solution; (1-3) mixing the binder solution with the mixture 1 to obtain a mixture 2; and (1-4) granulating the mixture 2 to obtain the glucose core.

8. A method for preparing the glucose pellet according to claim 3, comprising the steps of preparing a laminated layer as follows: (2-1) mixing a glucose, and/or a glucose hydrate with a first additional agent as a diluent to obtain a mixture; (2-2) dissolving a second additional agent as a binder in a solvent to form a binder solution; and (2-3) performing lamination treatment of the glucose core with the mixture and the binder solution, and drying to obtain the glucose pellet.

9. The method for preparing the glucose pellet according to claim 8, wherein the method further comprises the following steps of coating the glucose pellet: (3-1) formulating ethanol and water into an ethanol-water solution, dissolving a first agent as a porogen in the ethanol-water solution, and adding a second agent as a film-forming agent to obtain a solution; (3-2) dissolving a third agent as a plasticizer in the solution obtained in the step (3-1) to obtain a coating solution; (3-3) coating the glucose pellet with the coating solution obtained in the step (3-2), and drying to obtain a glucose sustained-release pellet.

10. A pharmaceutical composition comprising the glucose pellet according to claim 3.

11. A method for treating a glycogen storage disease or a diabetes, comprising a step of administering to a subject in need thereof an effective amount of the glucose pellet according to claim 3.

12. A method for inhibiting glycogen accumulation or maintaining blood glucose stability, comprising a step of administering to a subject in need thereof an effective amount of the glucose pellet according to claim 3.

13. The glucose pellet according to claim 3, wherein the glucose, and/or the glucose hydrate is present in the laminated layer in an amount of ≥70%, as calculated by weight percentage.

14. The glucose pellet according to claim 3, wherein the glucose, and/or the glucose hydrate is a particle consisting of a size sieved through a mesh of 110, 120, 130, 140 or 150 in the laminated layer, as measured by Chinese National Standard sieves.

15. The method for preparing the glucose pellet according to claim 8, wherein, in the step (2-3), the weight ratio of the mixture to the glucose core is (1.5-6):1.

16. The method for preparing the glucose pellet according to claim 8, wherein, in the step (2-3), an addition rate ratio of the mixture to the binder solution is (1.36-2.25):1 (g.Math.min.sup.−1/g.Math.min.sup.−1).

17. A method for treating a glycogen storage disease or a diabetes, comprising a step of administering to a subject in need thereof an effective amount of the pharmaceutical composition according to claim 10.

18. A method for inhibiting glycogen accumulation or maintaining blood glucose stability, comprising a step of administering to a subject in need thereof an effective amount of the pharmaceutical composition according to claim 10.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In order to make the content of the present invention easier to understand, the present invention will be further described in the following examples with reference to the accompanying drawings, in which:

(2) FIG. 1 is a graph showing the dissolution rate-time curves of different sustained-release pellets in Test Example 3.

SPECIFIC MODELS FOR CARRYING OUT THE INVENTION

Example 1: Glucose Core A, Glucose Pellet A and Glucose Sustained-Release Pellet A

(3) 1. Preparation of Glucose Core A

(4) (1-1) Glucose monohydrate was pulverized, passed through a 120 mesh sieve, and the sieved portion was taken for subsequent steps. According to the formulation of Table 1, 614.0 g of glucose monohydrate and 371.0 g of MCC101 were added to a wet-mixing granulator and mixed uniformly;

(5) (1-2) According to the formulation of Table 1, 15.0 g of PVPK29/32 was dissolved in 300.0 g of water to prepare a binder solution; the binder solution was sprayed into the wet-mixing granulator in atomization manner, and the glucose core A was obtained via granule preparation and granulation, and the content of the glucose monohydrate in the glucose core A was 49.1% (W/W).

(6) TABLE-US-00001 TABLE 1 Weight Raw material (g) Manufacturer Glucose monohydrate 614 Xiwang Group Co., Ltd MCC101 (microcrystalline cellulose) 371 JRS, Germany PVPK29/32 (polyvinylpyrrolidone) 15 Ashalnd Purified water 300 —

(7) 2. Preparation of Glucose Pellet A

(8) (2-1) According to the formulation of Table 2, 2125.0 g of 120-mesh sieved glucose monohydrate, 250.0 g of MCC101 and 125.0 g of corn starch were uniformly mixed to obtain a powder;

(9) (2-2) According to the formulation of Table 2, 50 g of PVPK29/32 was dissolved in 950 g of water to prepare a 5.0% PVPK29/32 binder solution;

(10) (2-3) A coating granulator was started, and the obtained glucose core A was once added to the coating granulator. The rotating speed of turntable was set, and the powder obtained in the step (2-1) and the binder solution obtained in the step (2-2) were added continuously to the coating granulator in order to perform a laminating and powder-coating operation on the glucose core A, wherein the ratio of the total weight of the added powder to the total weight of the added glucose core A was 2.5:1, and the addition rate ratio of the powder to the binder solution was 1.70:1 (g.Math.min.sup.−1/g.Math.min.sup.−1). Then, the product was dried in a fluidized bed with an inlet air temperature of 50° C. and a drying time of 45 minutes to obtain the glucose pellet A, wherein the content of the glucose monohydrate in the laminated layer of the glucose pellet A was 81.73% (W/W).

(11) TABLE-US-00002 TABLE 2 Raw material Weight (g) Powder to be added Glucose monohydrate 2125 MCC101 250 Starch 125 Binder solution PVPK29/32 50 Water 950

(12) 3. Preparation of Glucose Sustained-Release Pellet A

(13) (3-1) A 80.0% (W/W) ethanol solution was prepared from ethanol and water. According to the formulation of Table 3, 32.0 g of hydroxypropylcellulose (HPC-EF) was dissolved in 3776.0 g of the 80.0% (W/W) ethanol solution under constant stirring, then added 160.0 g of 20 centipoise (cP) ethylcellulose, and stirred continuously until the dissolution was completed to obtain a clear transparent solution;

(14) (3-2) Before coating, according to the formulation of Table 3, 32.0 g of triethyl citrate (TEC) was added to the solution obtained by the step (3-1), stirred continuously and dissolved for 40 minutes, a coating solution was obtained;

(15) (3-3) 1000.0 g of the glucose pellet A was placed in a bottom spray coating pan of a fluidized bed, and the fluidization state of the pellet was adjusted. After preheating at an inlet air temperature of 40° C. for a while, 4000.0 g of the coating solution obtained in the step (3-2) was continuously sprayed into the fluidized bed, and the glucose pellet A was subjected to a coating treatment. After the completion of the coating, the inlet air temperature was set to 45° C. and a drying was carried out for 30 minutes to obtain the glucose sustained-release pellet A.

(16) TABLE-US-00003 TABLE 3 Raw material Action Weight (g) Ethylcellulose (20 cP) Film-forming material 160 HPC-EF Porogen 32 TEC Platicizer 32 80% (W/W) ethanol solution Solvent 3776

Example 2: Glucose Core B, Glucose Pellet B and Glucose Sustained-Release Pellet B

(17) 1. Preparation of Glucose Core B

(18) (1-1) Glucose monohydrate was pulverized, passed through a 120 mesh sieve, and the sieved portion was taken for subsequent steps. According to the formulation of Table 4, 750.0 g of glucose monohydrate and 230.0 g of MCC101 were added to a wet-mixing granulator and uniformly mixed to obtain an initial mixture;

(19) (1-2) According to the formulation of Table 4, 20.0 g of PVPK29/32 was dissolved in 230.0 g of water to prepare a binder solution; the binder solution was sprayed into the wet-mixing granulator in atomization manner, and the glucose core B was obtained via granule preparation and granulation, and the content of the glucose monohydrate in the glucose core B was 60.22% (W/W).

(20) TABLE-US-00004 TABLE 4 Raw material Weight (g) Glucose monohydrate 750 MCC101 230 PVPK29/32 20 Water 230

(21) 2. Preparation of Glucose Pellet B

(22) (2-1) According to the formulation of Table 5, 3062.5 g of 120-mesh sieved glucose monohydrate, 280.0 g of MCC101 and 157.5 g of corn starch were uniformly mixed to obtain a powder;

(23) (2-2) According to the formulation of Table 5, 25 g of PVPK29/32 was dissolved in 975 g of water to prepare a 2.5% PVPK29/32 binder solution;

(24) (2-3) A coating granulator was started, and the obtained glucose core B was added to the coating granulator at one time. The rotating speed of turntable was set, the powder obtained in the step (2-1) and the binder solution obtained in the step (2-2) were continuously added to the coating granulator in order to perform a laminating and powder-coating operation on the glucose core B, wherein the ratio of the total weight of the added powder to the total weight of the added glucose core B was 3.5:1, and the addition rate ratio of the powder to the binder solution was 1.78:1 (g.Math.min.sup.−1/g.Math.min.sup.−1). Then, the product was dried in a fluidized bed with an inlet air temperature of 50° C., and a drying time of 45 minutes to obtain the glucose pellet B, wherein the content of the glucose monohydrate in the laminated layer of the glucose pellet B was 86.0% (W/W).

(25) TABLE-US-00005 TABLE 5 Raw material Weight (g) Powder to be added Glucose monohydrate 3062.5 MCC101 280 Starch 157.5 Binder solution PVPK29/32 25 Purified water 975

(26) 3. Preparation of Glucose Sustained-Release Pellets B

(27) (3-1) A 80.0% (W/W) ethanol solution was prepared from Ethanol and water. According to the formulation of Table 6, 62.5 g of hydroxypropylmethylcellulose (HPMC-E5) was dissolved in 4625.0 g of the 80.0% (w/w) ethanol solution under constant stirring, then added 250.0 g of 10 centipoise (cP) ethylcellulose, and stirred continuously until the dissolution was completed to obtain a clear and transparent solution;

(28) (3-2) Before coating, according to the formulation of Table 6, 62.5 g of dibutyl sebacate (DBS) was added to the solution obtained in the step (3-1), stirred continuously and dissolved for 40 minutes, a coating solution was obtained.

(29) (3-3) 1000.0 g of the glucose pellet B was placed in a bottom spray coating pan of a fluidized bed, and the fluidization state of the pellet was adjusted. After preheating at an inlet air temperature of 42° C. for a while, 4000.0 g of the coating solution obtained in the step (3-2) was continuously sprayed into the fluidized bed to coat the glucose pellet B. After the completion of the coating, the inlet air temperature was set to 45° C. and a drying was carried out for 30 minutes to obtain the glucose sustained-release pellet B.

(30) TABLE-US-00006 TABLE 6 Raw material Weight (g) Ethylcellulose (10 cp) 250 HPMC-E5 62.5 DBS 62.5 80.0% (W/W) ethanol solution 4625

Example 3: Glucose Core C, Glucose Pellet C and Glucose Sustained-Release Pellet C

(31) 1. Preparation of Glucose Core C

(32) (1-1) Glucose monohydrate was pulverized, passed through a 120 mesh sieve, and the sieved portion was taken for subsequent steps. According to the formulation of Table 7, 800.0 g of glucose monohydrate, 150.0 g of MCC101 and 20.0 g of corn starch were added to a wet-mixing granulator and uniformly mixed to obtain an initial mixture;

(33) (1-2) According to the formulation of Table 7, 30.0 g of PVPK29/32 was dissolved in 270.0 g of water to prepare a binder solution; the binder solution was sprayed into the wet-mixing granulator in atomization manner, and the glucose core C was obtained via granule preparation and granulation, and in the glucose core C, the glucose monohydrate was present in an amount of 60.6% (W/W) and the starch was present in an amount of about 1.5% (W/W).

(34) TABLE-US-00007 TABLE 7 Raw material Weight (g) Glucose monohydrate 800 MCC101 150 Corn starch 20 PVPK29/32 30 Water 270

(35) 2. Preparation of Glucose Pellet C

(36) (2-1) According to the formulation of Table 8, 3910.0 g of 120-mesh sieved glucose monohydrate, 715.0 g of MCC101 and 375.0 g of corn starch were uniformly mixed to obtain a powder;

(37) (2-2) According to the formulation of Table 8, 72.0 g of PVPK29/32 was dissolved in 928.0 g of water to prepare a 7.2% PVPK29/32 binder solution;

(38) (2-3) A coating granulator was started, and the obtained glucose core C was added to the coating granulator at one time. The rotating speed of turntable was set, and the powder obtained in the step (2-1) and the binder solution obtained in the step (2-2) were added continuously to the coating granulator, in order to perform a laminating and powder-coating operation on the glucose core C, wherein the ratio of the total weight of the added powder to the total weight of the added glucose core C was 5.0:1, and the addition rate ratio of the powder to the binder solution was 1.64:1 (g.Math.min.sup.−1/g.Math.min.sup.−1). Then, the product was dried in a fluidized bed with an inlet air temperature of 50° C. and a drying time of 45 minutes to obtain the glucose pellet C, in which the content of the glucose monohydrate in the laminated layer of the glucose pellet C was 77.5% (W/W).

(39) TABLE-US-00008 TABLE 8 Raw material Weight (g) Powder to be added Glucose monohydrate 3910 MCC101 715 Starch 375 Binder solution PVPK29/32 72 Water 928

(40) 3. Preparation of Glucose Sustained-Release Pellet C

(41) (3-1) A 80.0% (W/W) ethanol solution was prepared from ethanol and water. According to the formulation of Table 9, 18.75 g of PVPK29/32 was dissolved in 3536.25 g of the 80.0% (W/W) ethanol solution under constant stirring, then added 150.0 g of 45 centipoise (cP) ethylcellulose, and stirred continuously until the dissolution was completed to obtain a clear and transparent solution;

(42) (3-2) Before coating, according to the formulation of Table 9, 45.0 g of tributyl citrate (TBC) was added to the solution obtained by the step (3-1), stirred continuously and dissolved for 40 minutes, a coating solution was obtained;

(43) (3-3) 1000.0 g of the glucose pellet C was placed in a bottom spray coating pan of a fluidized bed, and the fluidization state of the pellet was adjusted. After preheating for a while, 3750.0 g of the coating solution obtained in the step (3-2) was continuously sprayed into the fluidized bed, and the glucose pellets were subjected to a coating treatment. After the completion of the coating, the inlet air temperature was set to 45° C. and a drying was carried out for 30 minutes to obtain the glucose sustained-release pellet C.

(44) TABLE-US-00009 TABLE 9 Component Weight (g) Ethylcellulose (45 cP) 150 TBC 45 PVPK29/32 18.75 80% (W/W) ethanol solution 3536.25

Comparative Example 1: Glucose Core I (Effect of Glucose Monohydrate Content in Core)

(45) The glucose monohydrate was pulverized, passed through a 120 mesh sieve, and the sieved portion was taken for subsequent steps. According to the formulation of Table 10, 950.0 g of glucose monohydrate and 50.0 g of MCC101 were added to a wet-mixing granulator and mixed uniformly; according to the formulation of Table 10, 12.36 g of PVPK29/32 was dissolved in 93.58 g of purified water to prepare a binder solution. The rest steps were carried out in the same manner as in Example 1, to obtain a glucose core I, wherein the content of the glucose monohydrate in the glucose core I was 85.29% (W/W).

(46) The results of particle size distribution detection of the glucose core I are shown in Test Example 1.

(47) TABLE-US-00010 TABLE 10 Raw material Weight (g) Glucose monohydrate 950.0 MCC101 50.0 PVPK29/32 12.36 Purified water 93.58

Comparative Example 2: Glucose Core II (Effect of Particle Size of Glucose Monohydrate in Core)

(48) The experiment was carried out by using 100-mesh sieved (<150 μm) glucose monohydrate, and the rest steps were carried out in the same manner as in Example 1 to obtain the glucose core II.

(49) The results of surface state detection of the glucose core II are shown in Test Example 2.

Comparative Example 3: Glucose Pellet III (Effect of Glucose Monohydrate Content in Laminated Layer)

(50) According to the formulation of Table 11, 1500.0 g of 120-mesh sieved glucose monohydrate, 625.0 g of MCC101 and 375.0 g of corn starch were uniformly mixed to obtain a powder; according to the formulation of Table 11, 50.0 g of PVPK29/32 was dissolved in 950.0 g of water to obtain a 5.0% PVPK29/32 binder solution; the rest steps were carried out in the same manner as in Example 1 to obtain the glucose pellet III, in which the glucose content in the laminated layer of the glucose pellet III was 58.82% (W/W).

(51) The results of release effect of a glucose sustained-release pellet III prepared from the glucose pellet III are shown in Test Example 3.

(52) TABLE-US-00011 TABLE 11 Raw material Weight (g) Powder to be added Glucose monohydrate 1500 MCC101 625 Corn starch 375 Binder solution PVPK29/32 50 Water 950

Comparative Example 4: Glucose Pellet IV (Effect of Particle Size of Glucose Monohydrate in Laminated Layer)

(53) According to the formulation of the laminated layer, a glucose monohydrate passed through a 100 mesh sieve (<150 μm) was taken for the experiment, and the rest steps were carried out in the same manner as in Example 1 to obtain the glucose pellet IV.

(54) The results of surface state detection of the glucose pellet IV are shown in Test Example 2.

Comparative Example 5: Glucose Pellet V and Glucose Pellet VI (Effect of Particle Size of Glucose Core)

(55) (1) Preparation and Particle Size Distribution Detection of the Glucose Pellet V

(56) According to the formulation of Table 12, 614.0 g of glucose monohydrate and 371.0 g of MCC101 were uniformly mixed in a wet-mixing granulator, and 5.0 g of PVPK-30 was dissolved in 100.0 g of purified water to prepare a binder solution, and the rest steps were carried out in accordance with Example 1 to obtain the core, in which the obtained core had a particle size smaller than that of the glucose core A.

(57) TABLE-US-00012 TABLE 12 Raw material Weight (g) Glucose monohydrate 614.0 MCC101 371.0 PVPK29/32 5.0 Purified water 100.0

(58) The glucose pellet V was prepared in accordance with the method of Example 1 from the prepared glucose core having a smaller particle size. After sampling, the detection was carried out using an Olympus SZXZ-ILLB optical microscope in combination with an accessory detection software, and it was observed that the glucose cores in the glucose pellet V had mutual adhesion phenomenon.

(59) (2) Preparation and Particle Size Distribution Detection of Glucose Pellet VI

(60) Glucose pellet VI was prepared from the glucose core I obtained in Comparative Example 1, and prepared in accordance with Example 1. The results of particle size distribution detection of the glucose pellet VI are described in Test Example 1.

Comparative Example 6: Glucose Core VII (Effect of Starch Content in Core)

(61) According to the formulation of Table 13, 614.0 g of 120-mesh sieved glucose monohydrate, 195.0 g of starch and 176.0 g of MCC101 were added to a wet-mixing granulator and mixed uniformly, and the rest steps were carried out with reference to Example 1, to obtain the glucose core VII, wherein the starch content was about 14.76% (W/W).

(62) The results of particle size distribution detection of glucose core VII are shown in Test Example 1.

(63) TABLE-US-00013 TABLE 13 Raw material Weight (g) Glucose monohydrate 614 MCC101 176 Starch 195 PVPK29/32 15 Water 300

Comparative Example 7: Glucose Pellet VIII and Glucose Pellet IX (Effect of Powder/Core Weight Ratio)

(64) (1) Preparation and Particle Size Detection of Glucose Pellet VIII:

(65) In the laminating and powder-coating operation of the glucose core, the ratio of the total weight of the added powder to the total weight of the added glucose core A was 1:1; the rest steps were carried out with reference to Example 1; and the glucose pellet VIII was obtained.

(66) (2) Preparation and Particle Size Detection of Glucose Pellet IX:

(67) In the laminating and powder-coating operation of the glucose core, the ratio of the total weight of the added powder to the total weight of the added glucose core A was 8:1; the rest steps were carried out with reference to Example 1; and the glucose pellet IX was obtained.

(68) The results of particle size distribution detection of the glucose pellet VIII and the glucose pellet IX are shown in Test Example 1.

Comparative Example 8: Glucose Pellet X and Glucose Pellet XI (Effect of Ratio of Powder Supplying Rate and Slurry Spraying Rate)

(69) (1) Preparation and Particle Size Detection of Glucose Pellet X:

(70) In the laminating and powder-coating operation of the glucose core, the addition rate ratio of the powder and the binder solution was 1:1 (g.Math.min.sup.−1/g.Math.min.sup.−1), and the rest steps were carried out with reference to Example 1, to obtain the glucose pellet X. After sampling, the detection was carried out using an Olympus SZXZ-ILLB optical microscope combined with an accessory detection software, and it was observed that the glucose cores in the pellet adhered to each other.

(71) (2) Preparation, Particle Size Detection and Surface State Detection of Glucose Pellet XI:

(72) in the laminating and powder-coating operation of the glucose core, the addition rate ratio of the powder to the binder solution was 3:1 (g.Math.min.sup.−1/g.Math.min.sup.−1), the rest steps were carried out with reference to Example 1 to obtain the glucose pellet XI.

(73) The results of particle size distribution detection of the glucose pellet XI are shown in Test Example 1, and the results of surface state detection of that are shown in Test Example 2.

Test Example 1: Particle Size Distribution Test

(74) (1) Particle Size Distribution of Glucose Core

(75) The particle size distributions of the glucose cores of Example 1, Comparative Example 1, and Comparative Example 6 were detected, and the detection method was to measure the particle sizes of the cores by Olympus SZXZ-ILLB type optical microscope combined with an accessory detection software. The particle size distribution of the core was determined from the measured particle sizes of the largest core and the smallest core, and the results are shown in Table 14.

(76) TABLE-US-00014 TABLE 14 Comparative Comparative Test Example 1 Example 1 Example 6 Core Core A Core I Core VII Particle 0.25 mm 0.38 mm 0.42 mm size of the largest core Particle 0.15 mm 0.18 mm 0.13 mm size of the smallest core Particle 0.15 mm~ 0.18 mm~ 0.13 mm~ size 0.25 mm 0.38 mm 0.42 mm distribution

(77) The results showed:

(78) The core I of Comparative Example 1 had a larger particle diameter than the core A of Example 1, and its particle size distribution was not narrower than that of the core A. It could be seen that the excessive content of glucose monohydrate in core resulted in a larger particle size of the core and a broader particle size distribution.

(79) The largest particle size of the core VII of Comparative Example 6 was larger than that of the core A of Example 1, and its particle size distribution was broader, much broader than the particle size distribution of the core A. It could be seen that the excessive starch content in core resulted in a larger particle size and a broader particle size distribution of the core.

(80) (2) Particle Size Distribution of Glucose Pellet

(81) The particle size distributions of the glucose pellets in Example 1, Comparative Example 5 (2), Comparative Example 7, and Comparative Example 8 (2) were detected, and the detection method was to perform screening by Chinese National Standard sieves (GB/T6005-2008, Test Sieves, basic sizes of metal wire mesh, perforated plate and electroformed sheet mesh), to weigh the masses of pellets in different particle size ranges, and to calculate the mass proportions thereof, and the results are shown in Table 15.

(82) TABLE-US-00015 TABLE 15 Comparative Comparative Example 5 Comparative Example 8 Test Example 1 (2) Example 7 (2) Kind of Pellet Pellet Pellet Pellet Pellet pellet A VI VIII IX XI >20 mesh 2.6% 15.5% 0.3% 45.8% 0.9% 20~30 mesh 68.2% 70.1% 8.6% 38.4% 41.4% 30~40 mesh 24.4% 12.6% 35.2% 12.8% 25.4% 40~50 mesh 3.1% 1.2% 40.7% 2.7% 18.7% <50 mesh 1.7% 0.6% 15.2% 0.3% 13.6%

(83) The results showed:

(84) The particle size of the glucose pellet of Comparative Example 5 (2) was larger than that of Example 1, mainly because that the proportion of the large particle size pellets increased, i.e. the proportion of the 30 to 40 mesh pellets decreased, and the proportion of the pellets larger than 20 mesh increased significantly. It could be seen that the glucose pellet prepared by the core with larger particle size had a larger particle size.

(85) The particle size of the glucose pellet of Comparative Example 7 (1) was smaller than that of Example 1. When the ratio of the total weight of the powder to the total weight of the core was 1:1, the pellets were mainly of 30 to 50 mesh. It could be seen that when other conditions were same and the weight ratio of powder/core was relatively smaller, the pellet would have a smaller particle size.

(86) The glucose pellets of Comparative Example 7 (2) had a larger particle size than that of Example 1, in which about 45.8% of the pellets had a size larger than 20 mesh, and 38.4% of the pellets had a size between 20 to 30 mesh. It could be seen that when the other conditions were same and the weight ratio of powder/core was relatively larger, the pellet would have a larger particle size.

(87) The particle size of the glucose pellet of Comparative Example 8 (2) was smaller than that of Example 1, in which the proportion of the pellets smaller than 40 mesh was 32.3%, which was significantly more than 4.8% of Example 1. It could be seen that when other conditions were same and the ratio of powder feeding rate to slurry spraying rate was relatively larger, the pellet would have a smaller particle size.

Test Example 2: Surface State Test

(88) (1) Surface State of Glucose Cores

(89) The surface states of the glucose cores of Example 1 and Comparative Example 2 were detected. The detection method was to sample, and to observe under an optical microscope, and the results are shown in Table 16.

(90) TABLE-US-00016 TABLE 16 Comparative Test Example 1 Example 2 Kind of core Glucose core A Glucose core II Test results Core had flat surface Some cores had extremely without protrusions uneven surfaces adhered with and burrs. glucose crystals, and there were some ungranulated glucose crystals in the cores.

(91) The results showed that when the glucose monohydrate used in the core preparation process had a larger particle size and a broader particle size distribution, it would had a great influence on the surface state of the core.

(92) (2) Surface State of Glucose Pellets

(93) The surface states of the glucose pellets A, IV, and XI of Example 1, Comparative Example 4, and Comparative Example 8 (2) were detected, in which the detection method was to sample and to observe under an optical microscope, and the results are shown in Table 17.

(94) TABLE-US-00017 TABLE 17 Comparative Comparative Example 8 Test Example 1 Example 4 (2) Pellet Pellet Pellet Pellet A IV XI Test Pellet had a Some pellets had Pellet had rough results smooth and rugged surfaces surface with poor flat surface caused by glucose flatness, and the without burrs. crystals. surface of pellet was more easy to wear.

(95) The results showed:

(96) The larger particle size and the broader particle size distribution of the glucose monohydrate in the laminated layer would greatly affect the surface state of the pellet, which mainly manifested in that the pellet surface had a deteriorated flatness, the pellet surface became more uneven, and some pellets even had surfaces adhered with glucose crystals.

(97) If the ratio of the powder supplying rate to the slurry spraying rate was too large, it would affect the efficient and complete spreading of the powder on the core surface. Then it would affect the surface flatness and result in an increased roughness on the pellet surface.

Test Example 3: Test of Sustained-Release Effect

(98) The release effects of the sustained-release pellets of Examples 1 to 3, and the sustained-release pellet III prepared from the pellet III of Comparative Example 3 (referring to the preparation method of the sustained-release pellet in Example 1) were detected, in which the content and the dissolution rate of drug in the sustained-release pellet were used as evaluation indexes.

(99) (1) Determination of the Drug Content of the Sustained-Release Pellet by High Performance Liquid Phase Chromatography (Determination by High Performance Liquid Phase Chromatography According to Chinese Pharmacopoeia, 2015 Ed, General Rules 0512):

(100) Chromatographic conditions: Waters Xbridge™ Amide (50×4.6 mm, 5 μm) hydrophilic column; acetonitrile-water-triethylamine (70:30:0.2) as mobile phase, isocratic elution; flow rate 1.0 mL/min; column temperature: 45° C.; injection volume 20 μL; detection with Waters2424ELSD; drift tube temperature 70° C., sprayer heating 70%, pressure 35 psi, gain 10.

(101) Determination method: An appropriate amount of glucose sustained-release pellets (W.sub.sample, g), which was equivalent to about 100 mg of glucose, was sampled, and placed in a 100 mL (V.sub.1, mL) volumetric flask, acetonitrile in an appropriate amount was added, ultrasonicated and shaken for about 5 minutes to swell the coating; then 30 mL of water was added, ultrasonicated and shaken for about 5 minutes until the main drug was completely dissolved, diluted to the mark with acetonitrile, shaken uniformly, filtered, and 5 mL (V.sub.2, mL) of the filtrate was taken and placed in a 50 mL (V.sub.3, mL) volumetric flask, diluted to the mark with 70% acetonitrile, shaken uniformly, and used as a sample solution to be determined according to the above chromatographic conditions and test parameters. Additionally, 90 mg (W.sub.reference, mg) of anhydrous glucose was taken as a reference substance, weighed accurately, placed in a 100 mL volumetric flask, 30 mL of water was added, then ultrasonicated to dissolve the anhydrous glucose, and acetonitrile was added to the mark for dilution, so as to obtain a stock solution; 1 mL, 2 mL, 5 mL, 7 mL, 10 mL of the stock solution were accurately measured and taken, placed in five 50 mL volumetric flasks respectively, diluted with 70% acetonitrile-water to the mark, and used as standard curve solutions, and the determination thereof was carried out by the same method. The drug contents of the sustained release pellets were calculated, and the results are shown in Table 18.

(102) (2) Determination of Drug Dissolution Rate of Sustained-Release Pellets (Chinese Pharmacopoeia, 2015 Edition, Part IV, General Rules 0931, Second Method):

(103) An appropriate amount of glucose sustained-release pellets (S.sub.standard, mg), equivalent to about 100 mg of glucose, was taken, 500 mL (V.sub.4, mL) of water was as dissolution medium, rotation speed was set to 50 rpm, and the determination was carried out according to the method. After 1 hour, 2 hours, 4 hours, 6 hours, 8 hours, 10 hours, 12 hours, 5 mL of the solutions were taken respectively, filtered, and 3 mL (V.sub.5, mL) of the filtrate was taken and added to 10 mL (V.sub.6, mL) volumetric flask, diluted with acetonitrile to the mark, shaken uniformly, and used as a sample solution to be tested. And the dissolution medium with the same volume and the same temperature was added immediately. Anhydrous glucose 90 mg (W.sub.reference, mg) as reference substance was taken, accurately weighed, placed in a 100 mL volumetric flask, dissolved in water under ultrasonication and diluted to mark, and used as a stock solution. 1 mL, 2 mL, 5 mL, 7 mL, 10 mL of the stock solution were taken and accurately measured, placed in five 50 mL volumetric flasks respectively, diluted to mark with water, shaken well, and 3 mL of each of reference substance solutions with the above concentrations was accurately transferred to a 10 mL volumetric flask, diluted to mark with acetonitrile, shaken well, and used as a reference solution. According to the chromatographic conditions in the above item (1), 100 μL of each of the sample solutions and each of the reference solutions were accurately measured and injected into a liquid chromatograph for determination respectively. The log A.sub.reference of each reference solution was used as the ordinate, and the log c.sub.reference of that was used as the abscissa to plot a standard curve, wherein A.sub.reference indicated the peak area measured for each reference solution, and the c.sub.reference indicated the concentration of the corresponding reference solution. The peak area A.sub.sample of the sample solution was substituted into the standard curve to obtain the concentration c.sub.sample of the sample solution.

(104) The dissolution rate of the sample was calculated according to the following formula. The results are shown in Table 19 and FIG. 1.

(105) $\mathrm{Dissolution}\mathrm{rate}\left(\%\right)=\frac{c_{\mathrm{sample}}\times V_4\times V_6}{S_{\mathrm{standard}}\times 1000\times V_5}\times 100\%$
wherein, 1000 represents a conversion rate between mg and g.

(106) TABLE-US-00018 TABLE 18 Comparative Test Example 1 Example 2 Example 3 Example 3 Sustained- Sustained- Sustained- Sustained- Sustained- release release release release release pellet pellet A pellet B pellet C pellet III Drug content 63.94% 61.61% 64.95% 49.35% (W/W)

(107) TABLE-US-00019 TABLE 19 Sampling time point 0 h 1 h 2 h 4 h 6 h 8 h 10 h 12 h Dissolution Sustained- 0.0 4.0 9.4 27.6 64.2 81.1 85.7 88.4 rate (%) release pellet A Sustained- 0.0 4.4 13.4 39.5 58.3 69.4 71.5 71.6 release pellet B Sustained- 0.0 7.0 30.6 64.3 76.6 81.1 84.3 85.7 release pellet C Sustained- 0.0 1.7 4.4 13.4 39.5 58.3 69.4 72.7 release pellet III

(108) The results showed:

(109) According to the results of the drug content and dissolution rate tests of the sustained-release pellets, the drug content of the sustained-release pellet III with less glucose content in the laminated layer was much lower than those of the sustained-release pellets of Examples 1 to 3.

(110) Compared with the sustained-release pellets of Examples 1 to 3, the sustained-release effect of the sustained-release pellet III of Comparative Example 3 was significantly worse, mainly due to the slower release in the early stage and the incomplete release in the later stage.

(111) The sustained-release pellet III of Comparative Example 3 had a low drug content, and more sustained-release pellets were required to be loaded under the same specification, that was, the loading amount increased. Moreover, the utilization rate of glucose as main drug was not high due to that some main drug was not completely released in the later stage of release.

(112) It is apparent that the above-described examples are merely illustration of the invention, and are not intended to limit the embodiments of the invention. Other variations or modifications of the various forms of the invention may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust all of the embodiments. Obvious changes or variations resulting therefrom are still within the scope of the invention.