阅读说明：本技术 一种乙酰唑胺钠冻干粉针剂及其制备方法和应用 (Acetazolamide sodium freeze-dried powder injection and preparation method and application thereof ) 是由 彭贵子 汪祥 戴赫 于 2021-09-13 设计创作，主要内容包括：本发明公开了一种乙酰唑胺钠冻干粉针剂及其制备方法和应用,制备方法包括以下步骤：(1)将乙酰唑胺和注射用水混合,保持温度在5～10℃,再加入乙酰唑胺,搅拌,得到药液；(2)将药液进行除菌过滤,再经过预冻,干燥,得到乙酰唑胺钠冻干粉针剂；预冻的具体过程包括：降温至-40～-50℃,保温2～3h,再升温至-15～-25℃,保温2～3h,然后降温至-40～-50℃,保温4～5h。本发明制得的产品质量更加稳定,总杂含量少,无需添加有机试剂,安全性更高,并且制备方法简单。(The invention discloses an acetazolamide sodium freeze-dried powder injection, a preparation method and application thereof, wherein the preparation method comprises the following steps: (1) mixing acetazolamide with water for injection, keeping the temperature at 5-10 ℃, adding acetazolamide, and stirring to obtain a liquid medicine; (2) sterilizing and filtering the liquid medicine, pre-freezing and drying to obtain acetazolamide sodium freeze-dried powder injection; the pre-freezing process comprises the following specific steps: cooling to-40 to-50 ℃, preserving heat for 2-3 h, then heating to-15 to-25 ℃, preserving heat for 2-3 h, then cooling to-40 to-50 ℃, and preserving heat for 4-5 h. The product prepared by the method has more stable quality, less total impurity content, no need of adding organic reagents, higher safety and simple preparation method.)

1. The preparation method of the acetazolamide sodium freeze-dried powder injection is characterized by comprising the following steps:

(1) mixing acetazolamide with water for injection, keeping the temperature at 5-10 ℃, adding acetazolamide, and stirring to obtain a liquid medicine;

(2) sterilizing and filtering the liquid medicine, and then pre-freezing and drying to obtain the acetazolamide sodium freeze-dried powder injection;

the pre-freezing process comprises the following specific steps: cooling to-40 to-50 ℃, preserving heat for 2-3 h, then heating to-15 to-25 ℃, preserving heat for 2-3 h, then cooling to-40 to-50 ℃, and preserving heat for 4-5 h.

2. The preparation method according to claim 1, wherein the drying comprises sublimation drying and desorption drying in sequence, and the specific process of the sublimation drying comprises: heating to-35 to-30 ℃ under the condition of a vacuum degree of 3-8 Pa, preserving heat for 45-47 h, heating to-15 to-25 ℃ under the condition of a vacuum degree of 15-20 Pa, preserving heat for 6-8 h, heating to-5 to-10 ℃ and preserving heat for 1-2 h.

3. The preparation method according to claim 1, wherein the dilute alkali solution in the step (1) is a sodium hydroxide solution with a mass concentration of 3-5%.

4. The method according to claim 1, wherein the specific process of sterilizing filtration in step (2) comprises: the liquid medicine is filtered and sterilized by a 0.22 mu m PES filter membrane.

5. The method according to claim 2, wherein the specific process of the desorption drying comprises: and under the condition that the vacuum degree is 15-20 Pa, heating to 40-45 ℃, and preserving the heat for 10-11 h.

6. A sodium acetazolamide freeze-dried powder injection, which is characterized by being prepared by the preparation method of any one of claims 1 to 5.

7. The acetazolamide sodium freeze-dried powder injection according to claim 6, wherein the total impurities of the acetazolamide sodium freeze-dried powder injection are less than 0.3%, and the mass content of the active ingredient acetazolamide sodium is more than 99%.

8. The acetazolamide sodium lyophilized powder for injection of claim 6 or 7, for use in the preparation of a medicament for the treatment of glaucoma.

Technical Field

The invention belongs to the technical field of biological medicines, and particularly relates to an acetazolamide sodium freeze-dried powder injection, and a preparation method and application thereof.

Background

The chemical name of the acetazolamide sodium is N- (5-sulfamoyl-1, 3, 4-thiadiazole-2-yl) acetamide monosodium salt, and the molecular formula is C₄H₅N₄NaO₃S₂And the molecular weight is 244.23. The structural formula is as follows:

sodium acetazolamide for injection was first developed by TEVA works HEALTH INC corporation and marketed in the united states in 1990 by 12 months. The acetazolamide sodium for injection is unstable in liquid medicine state and can be degraded, so that the existing products on the market are all freeze-dried powder injection, but even if the acetazolamide sodium for injection is in the freeze-dried powder injection state, a large amount of hydrolysis impurities can still be generated in the freeze-dried preparation process, so that the impurity content in the final product is in a higher level, and is remarkably increased along with the prolonging of storage time, and certain influence can be generated on the effectiveness and safety of clinical medication.

The prior art discloses an injection-grade acetazolamide sodium freeze-dried preparation, wherein when an injection-grade acetazolamide sodium raw material medicine is prepared before freeze-drying, an organic solvent such as ethanol, methanol, isopropanol, acetone or butanone is added into a liquid medicine, so that the method easily causes residual organic solvent in a final product and generates certain risk for clinical application.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the acetazolamide sodium freeze-dried powder injection and the preparation method thereof provided by the invention have the advantages that the acetazolamide sodium freeze-dried powder injection has better stability and safety than the prior art, the maximum single impurity and total impurity content ratio is reduced by more than 60% than the prior art, no additional additives such as organic reagents and the like are added, the product safety is higher, the preparation is convenient, and the cost is low.

The first aspect of the invention provides a preparation method of acetazolamide sodium freeze-dried powder injection, which comprises the following steps:

(1) mixing acetazolamide with water for injection, keeping the temperature at 5-10 ℃, adding acetazolamide, and stirring to obtain a liquid medicine;

(2) sterilizing and filtering the liquid medicine, and then pre-freezing and drying to obtain the acetazolamide sodium freeze-dried powder injection;

the pre-freezing process comprises the following specific steps: cooling to-40 to-50 ℃, preserving heat for 2-3 h, then heating to-15 to-25 ℃, preserving heat for 2-3 h, then cooling to-40 to-50 ℃, and preserving heat for 4-5 h.

The applicant of the invention finds that the temperature of the prepared liquid, the temperature, the setting time, the maintaining time and the like in the pre-freezing process have obvious influence on the quality of the freeze-dried powder injection. The temperature of the prepared solution has great influence on the increase of impurities of the freeze-dried powder injection, and the stability of the solution can be enhanced only by controlling the temperature of the prepared solution within a specific range of 5-10 ℃, so that the generation of impurities is reduced, and meanwhile, active ingredients are not separated out. The pre-freezing adopts the modes of firstly cooling, then heating and then cooling, and mainly makes the liquid medicine undergo annealing, and simulates the slow freezing process, so that the frozen sample forms large ice crystals, and after the annealing, the ice crystals are more uniform and consistent, and the gaps among the ice crystals are larger, thereby being beneficial to the escape of water vapor in the subsequent drying stage, improving the uniformity of water content of the dried product, and making the cake shape of the product complete, consistent from top to bottom, free from cracking, fault, atrophy and collapse. The invention can obviously improve the quality of the product under the condition of controlling the specific liquid preparation temperature and the pre-freezing parameter. The water content of the product is reduced by about 50 percent compared with the original medicine, the maximum single impurity and the total impurity are reduced by more than 60 percent compared with the prior art, for example, the total impurity can be reduced to less than 0.3 percent from 0.69 to 1.26 percent of the original total impurity, and the maximum single impurity can be reduced to less than 0.25 percent from 0.59 to 1.19 percent of the original total impurity. If the temperature of the prepared liquid is too high, the liquid medicine can be degraded, so that impurities are increased; if the temperature of the solution is too low, acetazolamide or diluted alkali can be separated out.

Preferably, the specific process of step (1) comprises: and (3) injecting the injection water into the liquid preparation tank, cooling to 10-30 ℃, adding the dilute alkali solution, uniformly stirring, keeping the temperature at 5-10 ℃, adding the acetazolamide, completely stirring and dissolving, and adjusting the pH to 9.6 +/-0.2 to obtain the liquid medicine.

Preferably, the drying sequentially comprises sublimation drying and desorption drying, and the specific process of the sublimation drying comprises the following steps: heating to-35 to-30 ℃ under the condition of a vacuum degree of 3-8 Pa, preserving heat for 45-47 h, heating to-15 to-25 ℃ under the condition of a vacuum degree of 15-20 Pa, preserving heat for 6-8 h, heating to-5 to-10 ℃ and preserving heat for 1-2 h.

At liquid medicine sublimation drying inception, because goods moisture content is higher, consequently, adopt the lower temperature to sublimate to prevent collapsing, and along with the moisture of goods reduces gradually, melting temperature can rise, consequently, can rise sublimation temperature gradually, improves sublimation rate, adopts gradient sublimation drying promptly, can effectively guarantee that the goods has higher sublimation rate, thereby accomplishes sublimation process faster, reduces the energy consumption.

Preferably, the dilute alkali solution in the step (1) is a sodium hydroxide solution with the mass concentration of 3-5%.

Preferably, the specific process of the sterilizing filtration in the step (2) comprises the following steps: the liquid medicine is filtered and sterilized by a 0.22 mu m PES filter membrane.

Preferably, the specific process of the desorption drying comprises the following steps: under the condition that the vacuum degree is 15-20 Pa, the temperature is raised to 40-45 ℃ at the temperature rise rate of 0.5-1 ℃/min, and the temperature is preserved for 10-11 h.

The second aspect of the invention provides acetazolamide sodium freeze-dried powder injection which is prepared by adopting the preparation method.

Preferably, the total impurities of the acetazolamide sodium freeze-dried powder injection are less than 0.3%, and the mass content of the active ingredient acetazolamide sodium is more than 99%.

The prescription single dose theoretical dosage of the acetazolamide sodium freeze-dried powder injection is as follows: 500mg of acetazolamide, 157-169 mg of sodium hydroxide and 5mL of water for injection.

The third aspect of the invention provides the application of the acetazolamide sodium freeze-dried powder injection in the preparation of drugs for treating glaucoma.

Compared with the prior art, the invention has the following beneficial effects:

the invention overcomes the defects of the prior acetazolamide sodium freeze-dried powder injection, has more stable product quality, reduces the maximum single impurity and total impurity content by more than 60 percent compared with the prior art, does not add additional additives such as organic reagents and the like, has higher product safety, convenient preparation and low cost.

Drawings

FIG. 1 is an HPLC chromatogram of the acetazolamide sodium freeze-dried powder injection of example 1;

FIG. 2 is the HPLC chromatogram of the acetazolamide sodium freeze-dried powder injection of example 2;

FIG. 3 is the HPLC chromatogram of the acetazolamide sodium lyophilized powder for injection of example 3;

FIG. 4 is an HPLC chromatogram of the original drug of comparative example 5.

Detailed Description

In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.

The components, reagents or devices used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.

Example 1

The prescription of the acetazolamide sodium freeze-dried powder injection in the embodiment is shown in the table 1.

TABLE 1

Acetazolamide	10.066kg
		Sodium hydroxide	3.5kg
Water for injection	To 106.6kg

A preparation method of acetazolamide sodium freeze-dried powder injection comprises the following steps:

(1) preparing liquid: injecting 25kg of water for injection into a 200L liquid preparation tank, cooling to 20 ℃, adding 51kg of 5% sodium hydroxide solution, uniformly stirring, keeping the temperature at 8 ℃, adding 10.066kg of acetazolamide, completely stirring and dissolving, measuring the pH value, continuously adding 5% sodium hydroxide solution to enable the amount of sodium hydroxide to reach the amount designed in the prescription, adjusting the pH value to 9.6 +/-0.2, if the pH value is higher, adjusting by adding a proper amount of 0.1mol/L HCl, continuously adding the water for injection to the amount of the prescription to obtain the liquid medicine.

(2) Filtering and filling: filtering the obtained medicinal liquid with 0.22 μm PES filter membrane for sterilization, subpackaging the solution into 20mL penicillin bottles with the amount of 5mL per bottle, and half plugging.

(3) Pre-freezing and drying: sending the filled penicillin bottles into a freeze-drying box, cooling the temperature in the freeze-drying machine to-40 ℃ at a cooling rate of 0.5-1 ℃/min, preserving the heat for 2 hours, then heating the temperature to-15 ℃ at a heating rate of 0.5-1 ℃/min, preserving the heat for 2 hours, then cooling the temperature to-40 ℃ at a cooling rate of 0.5-1 ℃/min, and preserving the heat for 4 hours; starting vacuum, heating to-30 ℃ at the heating rate of 0.05-0.1 ℃/min under the condition that the vacuum degree is 5Pa, preserving heat for 47 hours, heating to-25 ℃ at the heating rate of 0.01-0.05 ℃/min under the condition that the vacuum degree is 20Pa, preserving heat for 8 hours, heating to-10 ℃ at the heating rate of 0.1-0.5 ℃/min, and preserving heat for 1 hour; under the condition that the vacuum degree is 20Pa, the temperature is increased to 40 ℃ at the heating rate of 0.5-1 ℃/min, and the temperature is kept for 10 h.

(4) And after the freeze drying is finished, maintaining the vacuum degree to be about 0.1mbar, carrying out vacuum tamponade, cooling to room temperature after the tamponade is finished, and then carrying out recompression and box discharging by clean dry nitrogen.

Referring to fig. 1, fig. 1 is an HPLC (high performance liquid chromatography) chromatogram (lot number: 210111211-2) of the acetazolamide sodium lyophilized powder injection prepared in this example.

Example 2

The prescription of the acetazolamide sodium freeze-dried powder injection of the embodiment is shown in the table 2.

TABLE 2

Acetazolamide	10.072kg
		Sodium hydroxide	3.5kg
Water for injection	Add to 106.76kg

A preparation method of acetazolamide sodium freeze-dried powder injection comprises the following steps:

(1) preparing liquid: injecting 25kg of water for injection into a 200L liquid preparation tank, cooling to 10 ℃, adding 51kg of 5% sodium hydroxide solution, uniformly stirring, keeping the temperature at 5 ℃, adding 10.072kg of acetazolamide, completely stirring and dissolving, measuring the pH value, continuously adding 5% sodium hydroxide solution to ensure that the amount of sodium hydroxide reaches the amount designed in the prescription, adjusting the pH value to 9.6 +/-0.2, if the pH value is higher, adjusting by adding a proper amount of 0.1mol/L HCl, continuously adding the water for injection to the amount of the prescription to obtain the liquid medicine.

(2) Filtering and filling: filtering the obtained medicinal liquid with 0.22 μm PES filter membrane for sterilization, subpackaging the solution into 20mL penicillin bottles with the amount of 5mL per bottle, and half plugging.

(3) Pre-freezing and drying: sending the filled penicillin bottles into a freeze-drying box, cooling the temperature in the freeze-drying machine to minus 45 ℃ at a cooling rate of 0.5-1 ℃/min, preserving the heat for 2 hours, then heating the temperature to minus 20 ℃ at a heating rate of 0.5-1 ℃/min, preserving the heat for 2 hours, then cooling the temperature to minus 45 ℃ at a cooling rate of 0.5-1 ℃/min, and preserving the heat for 4 hours; starting vacuum, heating to-35 ℃ at the heating rate of 0.05-0.1 ℃/min under the condition that the vacuum degree is 3Pa, preserving heat for 45h, heating to-15 ℃ at the heating rate of 0.01-0.05 ℃/min under the condition that the vacuum degree is 15Pa, preserving heat for 6h, heating to-5 ℃ at the heating rate of 0.1-0.5 ℃/min, and preserving heat for 2 h; under the condition that the vacuum degree is 15Pa, the temperature is increased to 45 ℃ at the heating rate of 0.5-1 ℃/min, and the temperature is kept for 11 h.

(4) And after the freeze drying is finished, maintaining the vacuum degree to be about 0.1mbar, carrying out vacuum tamponade, cooling to room temperature after the tamponade is finished, and then carrying out recompression and box discharging by clean dry nitrogen.

Referring to FIG. 2, FIG. 2 shows the HPLC chromatogram of the acetazolamide sodium lyophilized powder for injection (lot number: 210104211-2) prepared in this example.

Example 3

The prescription of the acetazolamide sodium freeze-dried powder injection in the embodiment is shown in the table 3.

TABLE 3

Acetazolamide	10.069kg
		Sodium hydroxide	3.5kg
Water for injection	To 106.8kg

A preparation method of acetazolamide sodium freeze-dried powder injection comprises the following steps:

(1) preparing liquid: injecting 25kg of water for injection into a 200L liquid preparation tank, cooling to 30 ℃, adding 51kg of 5% sodium hydroxide solution, uniformly stirring, keeping the temperature at 10 ℃, adding 10.069kg of acetazolamide, completely stirring and dissolving, measuring the pH value, continuously adding 5% sodium hydroxide solution to enable the amount of sodium hydroxide to reach the amount designed in the prescription, adjusting the pH value to 9.6 +/-0.2, if the pH value is higher, adjusting by adding a proper amount of 0.1mol/L HCl, continuously adding the water for injection to the amount of the prescription to obtain the liquid medicine.

(2) Filtering and filling: filtering the obtained medicinal liquid with 0.22 μm PES filter membrane for sterilization, subpackaging the solution into 20mL penicillin bottles with the amount of 5mL per bottle, and half plugging.

(3) Pre-freezing and drying: sending the filled penicillin bottles into a freeze-drying box, cooling the temperature in the freeze-drying machine to-50 ℃ at a cooling rate of 0.5-1 ℃/min, preserving the heat for 3 hours, then heating the temperature to-25 ℃ at a heating rate of 0.5-1 ℃/min, preserving the heat for 3 hours, then cooling the temperature to-50 ℃ at a cooling rate of 0.5-1 ℃/min, and preserving the heat for 5 hours; starting vacuum, heating to-30 ℃ at the heating rate of 0.05-0.1 ℃/min under the condition that the vacuum degree is 8Pa, preserving heat for 46h, heating to-25 ℃ at the heating rate of 0.01-0.05 ℃/min under the condition that the vacuum degree is 20Pa, preserving heat for 7h, heating to-10 ℃ at the heating rate of 0.1-0.5 ℃/min, and preserving heat for 2 h; under the condition that the vacuum degree is 20Pa, the temperature is increased to 40 ℃ at the heating rate of 0.5-1 ℃/min, and the temperature is kept for 10 h.

(4) And after the freeze drying is finished, maintaining the vacuum degree to be about 0.1mbar, carrying out vacuum tamponade, cooling to room temperature after the tamponade is finished, carrying out recompression by clean dry nitrogen, and taking out of the box.

Referring to FIG. 3, FIG. 3 is an HPLC chromatogram of the acetazolamide sodium lyophilized powder for injection prepared in this example (batch No. 201228211-2).

Example 4 (different from example 1 in that sublimation drying is not carried out by stepwise temperature elevation and heat retention)

The prescription of the acetazolamide sodium freeze-dried powder injection of the embodiment is shown in the table 4.

TABLE 4

Acetazolamide	100.112g
		Sodium hydroxide	34.813g
Water for injection	Adding to 1.067kg

A preparation method of acetazolamide sodium freeze-dried powder injection comprises the following steps:

(1) preparing liquid: injecting 250g of water for injection into a 5L liquid preparation tank, cooling to 20 ℃, adding 500g of 5% sodium hydroxide solution, uniformly stirring, keeping the temperature at 8 ℃, adding 100.11g of acetazolamide, completely stirring and dissolving, measuring the pH value, continuously adding 5% sodium hydroxide solution to ensure that the amount of sodium hydroxide reaches the amount designed in the prescription, adjusting the pH value to 9.6 +/-0.2, if the pH value is higher, adjusting by adding a proper amount of 0.1mol/L HCl, continuously adding the water for injection to the amount of the prescription to obtain the liquid medicine.

(2) Filtering and filling: filtering the obtained medicinal liquid with 0.22 μm PES filter membrane for sterilization, subpackaging the solution into 20mL penicillin bottles with the amount of 5mL per bottle, and half plugging.

(3) Pre-freezing and drying: sending the filled penicillin bottles into a freeze-drying box, cooling the temperature in the freeze-drying machine to-40 ℃ at a cooling rate of 0.5-1 ℃/min, preserving the heat for 2 hours, then heating the temperature to-15 ℃ at a heating rate of 0.5-1 ℃/min, preserving the heat for 2 hours, then cooling the temperature to-40 ℃ at a cooling rate of 0.5-1 ℃/min, and preserving the heat for 4 hours; starting vacuum, heating to-10 ℃ at the heating rate of 0.05-0.1 ℃/min under the condition that the vacuum degree is 5Pa, and preserving heat for 60 hours; under the condition that the vacuum degree is 20Pa, the temperature is increased to 40 ℃ at the heating rate of 0.5-1 ℃/min, and the temperature is kept for 13.5 h.

(4) And after the freeze drying is finished, maintaining the vacuum degree to be about 0.1mbar, carrying out vacuum tamponade, cooling to room temperature after the tamponade is finished, and then carrying out recompression and box discharging by clean dry nitrogen.

Comparative example 1 (different from example 1 in that the temperature at the time of liquid preparation was 11 ℃ C.)

The prescription of the acetazolamide sodium freeze-dried powder injection of the embodiment is shown in the table 5.

TABLE 5

Acetazolamide	100.079g
		Sodium hydroxide	34.901g
Water for injection	Adding to 1.067kg

A preparation method of acetazolamide sodium freeze-dried powder injection comprises the following steps:

(1) preparing liquid: injecting 250g of water for injection into a 5L liquid preparation tank, cooling to 20 ℃, adding 500g of 5% sodium hydroxide solution, uniformly stirring, keeping the temperature at 11 ℃, adding 10.066kg of acetazolamide, completely stirring and dissolving, measuring the pH value, continuously adding 5% sodium hydroxide solution to enable the amount of sodium hydroxide to reach the amount designed in the prescription, adjusting the pH value to 9.6 +/-0.2, if the pH value is higher, adjusting by adding a proper amount of 0.1mol/L HCl, continuously adding the water for injection to the amount of the prescription to obtain the liquid medicine.

(2) Filtering and filling: filtering the obtained medicinal liquid with 0.22 μm PES filter membrane for sterilization, subpackaging the solution into 20mL penicillin bottles with the amount of 5mL per bottle, and half plugging.

(3) Pre-freezing and drying: sending the filled penicillin bottles into a freeze-drying box, cooling the temperature in the freeze-drying machine to-40 ℃ at a cooling rate of 0.5-1 ℃/min, preserving the heat for 2 hours, then heating the temperature to-15 ℃ at a heating rate of 0.5-1 ℃/min, preserving the heat for 2 hours, then cooling the temperature to-40 ℃ at a cooling rate of 0.5-1 ℃/min, and preserving the heat for 4 hours; starting vacuum, heating to-30 ℃ at the heating rate of 0.05-0.1 ℃/min under the condition that the vacuum degree is 5Pa, preserving heat for 47 hours, heating to-25 ℃ at the heating rate of 0.01-0.05 ℃/min under the condition that the vacuum degree is 20Pa, preserving heat for 8 hours, heating to-10 ℃ at the heating rate of 0.1-0.5 ℃/min, and preserving heat for 1 hour; under the condition that the vacuum degree is 20Pa, the temperature is increased to 40 ℃ at the heating rate of 0.5-1 ℃/min, and the temperature is kept for 10 h.

(4) And after the freeze drying is finished, maintaining the vacuum degree to be about 0.1mbar, carrying out vacuum tamponade, cooling to room temperature after the tamponade is finished, and then carrying out recompression and box discharging by clean dry nitrogen.

Comparative example 2 (difference from example 1 in that the temperature at the time of liquid preparation was 4 ℃ C.)

The prescription of the acetazolamide sodium freeze-dried powder injection in the embodiment is shown in table 6.

TABLE 6

Acetazolamide	100.102g
		Sodium hydroxide	34.076g
Water for injection	Adding to 1.067kg

A preparation method of acetazolamide sodium freeze-dried powder injection comprises the following steps:

(1) preparing liquid: injecting 250g of water for injection into a 5L liquid preparation tank, cooling to 20 ℃, adding 500g of 5% sodium hydroxide solution, uniformly stirring, keeping the temperature at 4 ℃, adding 100.102g of acetazolamide, completely stirring and dissolving, measuring the pH value, continuously adding 5% sodium hydroxide solution to enable the amount of sodium hydroxide to reach the amount designed in the prescription, adjusting the pH value to 9.6 +/-0.2, if the pH value is higher, adjusting by adding a proper amount of 0.1mol/L HCl, continuously adding the water for injection to the amount of the prescription to obtain the liquid medicine.

(2) Filtering and filling: filtering the obtained medicinal liquid with 0.22 μm PES filter membrane for sterilization, subpackaging the solution into 20mL penicillin bottles with the amount of 5mL per bottle, and half plugging.

(3) Pre-freezing and drying: sending the filled penicillin bottles into a freeze-drying box, cooling the temperature in the freeze-drying machine to-40 ℃ at a cooling rate of 0.5-1 ℃/min, preserving the heat for 2 hours, then heating the temperature to-15 ℃ at a heating rate of 0.5-1 ℃/min, preserving the heat for 2 hours, then cooling the temperature to-40 ℃ at a cooling rate of 0.5-1 ℃/min, and preserving the heat for 4 hours; starting vacuum, heating to-30 ℃ at the heating rate of 0.05-0.1 ℃/min under the condition that the vacuum degree is 5Pa, preserving heat for 47 hours, heating to-25 ℃ at the heating rate of 0.01-0.05 ℃/min under the condition that the vacuum degree is 20Pa, preserving heat for 8 hours, heating to-10 ℃ at the heating rate of 0.1-0.5 ℃/min, and preserving heat for 1 hour; under the condition that the vacuum degree is 20Pa, the temperature is increased to 40 ℃ at the heating rate of 0.5-1 ℃/min, and the temperature is kept for 10 h.

(4) And after the freeze drying is finished, maintaining the vacuum degree to be about 0.1mbar, carrying out vacuum tamponade, cooling to room temperature after the tamponade is finished, and then carrying out recompression and box discharging by clean dry nitrogen.

Comparative example 3 (different from example 1 in that pre-freezing was not performed by raising and lowering the temperature)

The prescription of the comparative example acetazolamide sodium freeze-dried powder injection is shown in Table 7.

TABLE 7

Acetazolamide	100.086g
		Sodium hydroxide	34.853g
Water for injection	Adding to 1.067kg

A preparation method of acetazolamide sodium freeze-dried powder injection comprises the following steps:

(1) preparing liquid: injecting 250g of water for injection into a 5L liquid preparation tank, cooling to 20 ℃, adding 500g of 5% sodium hydroxide solution, uniformly stirring, keeping the temperature at 8 ℃, adding 100,086g of acetazolamide, completely stirring and dissolving, measuring the pH value, continuously adding 5% sodium hydroxide solution to enable the amount of sodium hydroxide to reach the amount designed in the prescription, adjusting the pH value to 9.6 +/-0.2, if the pH value is higher, adjusting by adding a proper amount of 0.1mol/L HCl, continuously adding the water for injection to the amount of the prescription to obtain the liquid medicine.

(2) Filtering and filling: filtering the obtained medicinal liquid with 0.22 μm PES filter membrane for sterilization, subpackaging the solution into 20mL penicillin bottles with the amount of 5mL per bottle, and half plugging.

(3) Pre-freezing and drying: sending the filled penicillin bottles into a freeze-drying box, cooling the temperature in the freeze-drying machine to-40 ℃ at a cooling rate of 0.5-1 ℃/min, and preserving the heat for 8 hours; starting vacuum, heating to-30 ℃ at the heating rate of 0.05-0.1 ℃/min under the condition that the vacuum degree is 5Pa, preserving heat for 47 hours, heating to-25 ℃ at the heating rate of 0.01-0.05 ℃/min under the condition that the vacuum degree is 20Pa, preserving heat for 8 hours, heating to-10 ℃ at the heating rate of 0.1-0.5 ℃/min, and preserving heat for 1 hour; under the condition that the vacuum degree is 20Pa, the temperature is increased to 40 ℃ at the heating rate of 0.5-1 ℃/min, and the temperature is kept for 10 h.

(4) And after the freeze drying is finished, maintaining the vacuum degree to be about 0.1mbar, carrying out vacuum tamponade, cooling to room temperature after the tamponade is finished, and then carrying out recompression and box discharging by clean dry nitrogen.

Comparative example 4

The difference from example 1 is that the sample was prepared according to the lyophilization method described in CN103319436A example 5.

The prescription of the acetazolamide sodium freeze-dried powder injection of the embodiment is shown in the table 8.

TABLE 8

Acetazolamide sodium salt	183.671g
		0.1M hydrochloric acid	Proper amount of
Water for injection	Adding to 1.067kg

A preparation method of acetazolamide sodium freeze-dried powder injection comprises the following steps:

(1) preparing liquid: injecting 800g of water for injection into a 5L liquid preparation tank, controlling the water temperature at 60-70 ℃, adding 183.671g of acetazolamide sodium, stirring and dissolving completely, measuring the pH value, adding 0.1M hydrochloric acid solution if necessary, adjusting the pH value to 9.6 +/-0.2, and continuously adding the water for injection to the prescription amount to obtain the liquid medicine.

(2) Filtering and filling: filtering the obtained medicinal liquid with 0.22 μm PES filter membrane for sterilization, subpackaging the solution into 20mL penicillin bottles with the amount of 5mL per bottle, and half plugging.

(3) Pre-freezing and drying: and (3) sending the filled penicillin bottles into a freeze-drying box, and then reducing the temperature in the freeze-drying machine to be below-45 ℃ within 2 hours to quickly freeze the penicillin bottles. Vacuumizing, and making the atmospheric pressure in the box reach 2.80pa within 30 min. And (4) starting temperature programming and drying according to the temperature of the plate rising from minus 45 ℃ to 25 ℃. And after drying, plugging and capping to obtain the acetazolamide sodium freeze-dried powder injection.

Comparative example 5

Sodium acetazolamide for injection (original drug) commercially available as Acetazolamide for injection from X-GEN Pharmaceuticals, USA, with batch number AM1806B

Referring to fig. 4, fig. 4 is an HPLC chromatogram of the original drug of the comparative example.

The results of the tests conducted on the acetazolamide sodium lyophilizates of examples 1-4 and comparative examples 1-5 are shown in Table 9.

TABLE 9

As can be seen from Table 9, the maximum single impurity and total impurity of the products prepared in examples 1 to 4 of the present invention are reduced by more than 60% compared with those of the prior art (comparative example 4 and comparative example 5), the total impurity can be reduced from 0.69 to 1.26% to less than 0.3%, and the maximum single impurity can be reduced from 0.59 to 1.19% to less than 0.25%. In example 4, the sublimation drying process does not adopt a gradual heating and heat preservation mode, so that the freeze-drying time is longer and the energy consumption is high. Compared with example 1, the preparation temperature is higher, so that the main component is degraded more, and the maximum single impurity and the total impurity are higher. Comparative example 2 compared with example 1, the liquid preparation temperature was lower, and although the maximum single impurity and total impurity were lower, the liquid medicine was turbid, and the active ingredient was precipitated. Compared with the example 1, as the pre-freezing mode does not adopt a temperature raising and reducing mode, although the maximum single impurity and the total impurity are lower, the product has cake-shaped layering and atrophy, the difference of the moisture among bottles is large, part of the product has high moisture, and part of the product has low moisture.

Accelerated tests were conducted on the acetazolamide sodium lyophilizates of examples 1-3 and comparative examples 4-5, respectively, and samples were examined after 6 months of acceleration, with the results shown in Table 10.

Watch 10

As can be seen from table 10, after 6 months of accelerated test, the maximum single impurity and total impurity of the products prepared in examples 1 to 3 of the present invention are reduced by more than 20% compared with those of the prior art (comparative example 4 and comparative example 5), the total impurity can be reduced from 1.32 to 2.15% to less than 1.1%, and the maximum single impurity can be reduced from 1.2 to 2.09% to less than 1%.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.