JP6352476B2 - Injection solution preparation and method for producing the same - Google Patents

Description

  The present invention relates to an injection preparation and a method for producing the same.

Pemetrexed is a kind of active ingredient of an antitumor drug, and an anticancer agent containing pemetrexed as an active ingredient is administered to a patient by intravenous drip injection.
Patent Document 1 discloses a liquid formulation in which pemetrexed is combined with at least one antioxidant selected from the group consisting of monothioglycerol, L-cysteine, and thioglycolic acid.
Patent Document 2 includes pemetrexed, at least one antioxidant selected from the group consisting of lipoic acid, dihydrolipoic acid and methionine, and at least one chelating agent selected from the group consisting of lactobionic acid and sodium citrate; A composition having a pH of 8 to 9.5 in combination with a pharmaceutically acceptable liquid is disclosed.
Patent Document 3 discloses that an injection solution containing pemetrexed and not containing an antioxidant has a dissolved oxygen concentration of 1 ppm or less, and an oxygen concentration when filling an injection container with an injection solution is 0.2% or less. A method for producing an injection by adjusting to the above is disclosed.

Special table 2003-521518 gazette International Publication No. 2012/015810 Pamphlet International Publication No. 2012/121523 Pamphlet

As described above, an anticancer agent containing pemetrexed as an active ingredient is administered to a patient by intravenous infusion. Therefore, it is desired to develop an injection solution containing pemetrexed in consideration of convenience and safety during use.
However, in the methods described in Patent Documents 1 to 3, the storage stability of the injectable solution formulation during storage, for example, the degradation effect of pemetrexed or a salt thereof contained in the injectable solution formulation, and the coloring effect of the injectable solution formulation are suppressed. Is not enough.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the injection solution formulation which can suppress decomposition | disassembly and coloring of pemetrexed or its salt in storage, and its manufacturing method.

Specific means for solving the above-described problems are as follows.
<1> include (i) ~ (iii), is, by weight ratio of the content of (i) and the content of (ii) the content of ((content :( ii of i))), 2.5: 1 to 2500: a 1, pH is not less than 7.0, the ratio of the number of oxygen molecules to pemetrexed number of molecules (the number of oxygen molecules / pemetrexed number of molecules) is 0.0080 Ri der less, and , injection liquid preparations are enclosed in a container enclosing the injection liquid preparations oxygen concentration in the gas in the container Ru der than 0.2 vol%.
(I) pemetrexed or a salt thereof (ii) 0.001% by mass or more and 0.1% by mass or less of sulfurous acid or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfurous acid or a salt thereof, based on the total mass of an injection solution formulation , nitrous acid or salts thereof, sulfur dioxide, and thiosulfate or at least one (iii) injection aqueous solvent more than 50% by weight relative to the total weight of the formulation selected from the group consisting of a salt thereof

<2 > The injection solution preparation according to <1 >, further comprising at least one selected from the group consisting of ascorbic acid, ascorbic acid derivatives, and salts thereof.

< 3 > The content of at least one selected from the group consisting of ascorbic acid, ascorbic acid derivatives, and salts thereof is 0.001% by mass or more in terms of ascorbic acid with respect to the total mass of the injection solution formulation. The injection solution preparation according to < 2 >, which is 0% by mass or less.
< 4 > Sulfurous acid or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfurous acid or a salt thereof, nitrous acid or a salt thereof, sulfur dioxide, and thiosulfuric acid or a salt thereof are at least one selected from sodium sulfite and sulfite The injection solution preparation according to any one of <1> to < 3 >, which is at least one selected from the group consisting of sodium hydrogen, sodium pyrosulfite, potassium sulfite, potassium hydrogen sulfite, and potassium pyrosulfite.

< 5 > (i) Pemetrexed or a salt thereof, and (ii) 0.001% by mass or more and 0.1% by mass or less of sulfurous acid or a salt thereof, hydrogen sulfite or a salt thereof, pyro At least one selected from the group consisting of sulfurous acid or a salt thereof, nitrous acid or a salt thereof, sulfur dioxide, and thiosulfuric acid or a salt thereof, and (iii) an aqueous solvent of 50% by mass or more based on the total mass of the injection solution Preparing an injection solution containing
The ratio of the content of (i) and the content of ( ii ) in the injection preparation (content of (i): content of ( ii )) is 2.5: 1 to 2500: Adjusting to 1,
Adjusting the ratio of the number of oxygen molecules to the number of pemetrexed molecules in the injection preparation (number of oxygen molecules / number of pemetrexed molecules) to 0.0080 or less,
Adjusting the pH of the injection preparation to 7.0 or higher , and
Oxygen concentration in the gas in the container by filling the container with an injection solution under an inert gas atmosphere or by replacing the gas in the container with an inert gas after filling the container with the injection solution A method for producing an injectable solution preparation, comprising adjusting the content to 0.2% by volume or less .
< 6 > The method for producing an injection preparation according to < 5 >, wherein the inert gas is nitrogen.

In the present specification, a numerical range expressed using “to” means a range including the numerical values described before and after “to” as a minimum value and a maximum value, respectively.
In this specification, the amount of each component in the composition is the total amount of the plurality of substances present in the composition unless there is a specific indication when there are a plurality of substances corresponding to each component in the composition. Means.
In this specification, the term “process” is not limited to an independent process, but is included in the term if the intended purpose of the process is achieved even if it cannot be clearly distinguished from other processes. It is.

  ADVANTAGE OF THE INVENTION According to this invention, the injection solution formulation which can suppress decomposition | disassembly and coloring of pemetrexed or its salt in storage, and its manufacturing method can be provided.

Hereinafter, the injection solution preparation of the present invention will be described in detail.
[Injection preparation]
The injection preparation of the present invention comprises (i) pemetrexed or a salt thereof, (ii) sulfurous acid or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfurous acid or a salt thereof, nitrous acid or a salt thereof, sulfur dioxide, and thiosulfuric acid or a salt thereof And at least one selected from the group consisting of salts (hereinafter, collectively referred to as “specific compounds” where appropriate), and (iii) an aqueous solvent of 50% by mass or more based on the total mass of the injection solution formulation, and pH is over 6.0.
Moreover, the injection solution preparation of this invention may contain other components other than (i)-(iii) as needed.

Pemetrexed or a salt thereof is known to undergo oxidative degradation in an injection solution formulation. The injection solution preparation of the present invention is at least one selected from the group consisting of sulfurous acid or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfurous acid or a salt thereof, nitrous acid or a salt thereof, sulfur dioxide, and thiosulfuric acid or a salt thereof. And an aqueous solvent of 50% by mass or more with respect to the total mass of the injection liquid formulation, and the pH exceeds 6.0, whereby pemetrexed or a salt thereof is decomposed in the injection liquid formulation during storage And coloring of the injection solution preparation can be suppressed.
The injectable solution preparation of the present invention is sodium sulfite, sodium pyrosulfite and the like, which are not effective for inhibiting the degradation of pemetrexed or a salt thereof, particularly in JP-T-2003-521518 (Patent Document 1). Not only the decomposition of pemetrexed or its salt in the injection liquid preparation but also the injection by including it in the injection liquid preparation together with pemetrexed or its salt and making the pH of the injection liquid preparation to exceed 6.0 This has an unexpected effect that the coloring of the liquid preparation can also be suppressed.

  The reason why the above-described decomposition of pemetrexed or a salt thereof is suppressed is not clear, but at least sulfite or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfurous acid or a salt thereof, nitrous acid or a salt thereof, sulfur dioxide, and thio It is presumed that by containing at least one selected from the group consisting of sulfuric acid or a salt thereof, the oxygen molecule contained in the injection preparation is reduced, and the reaction between pemetrexed or a salt thereof and the oxygen molecule is suppressed. However, the present invention is not limited to this.

(Pemetrexed or its salt)
The injection solution preparation of the present invention contains pemetrexed or a salt thereof.
Pemetrexed is an active ingredient of Alimta (registered trademark) manufactured and sold by Nippon Eli Lilly Co., Ltd. as an antimetabolite antineoplastic agent.
The salt of pemetrexed may be a pharmacologically acceptable salt, such as a salt of pemetrexed and an alkali metal (eg, sodium, potassium, etc.), pemetrexed and an alkaline earth metal (eg, calcium, magnesium, etc.) Salts of pemetrexed and transition metals (eg, zinc, iron, cobalt, copper, etc.), salts of pemetrexed and basic ammonium, pemetrexed and triethanolamine, pemetrexed and amino acids (eg, L-histidine) , L-arginine, L-lysine and the like) and the like.
Pemetrexed or a salt thereof is usually used alone, but two or more kinds can be used in combination.
The salt of pemetrexed is preferably at least one selected from the group consisting of sodium pemetrexed and potassium pemetrexed.
Note that pemetrexed or a salt thereof includes a hydrate thereof.

  The concentration of pemetrexed or a salt thereof in the injection preparation of the present invention is preferably 0.1% by mass to 10.0% by mass, and 0.5% by mass to 5% from the viewpoint of solubility and medicinal properties of pemetrexed. It is more preferably 0.0% by mass, and further preferably 1.0% by mass to 3.75% by mass.

(Specific compounds)
The injection preparation in the present invention is selected from the group consisting of specific compounds, that is, sulfurous acid or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfurous acid or a salt thereof, nitrous acid or a salt thereof, sulfur dioxide, and thiosulfuric acid or a salt thereof. Containing at least one selected from the group consisting of
The specific compound contained in the injection liquid preparation in the present invention is a component that suppresses decomposition of pemetrexed or a salt thereof during storage and coloring of the injection liquid preparation in the present invention.

Commercially available products can be used for sulfurous acid, hydrogen sulfite, pyrosulfurous acid, nitrous acid, sulfur dioxide, and thiosulfuric acid.
As the salt of sulfurous acid, the salt of hydrogen sulfite, the salt of pyrosulfite, the salt of nitrous acid, and the salt of thiosulfuric acid, all may be pharmacologically acceptable salts, such as sulfurous acid, hydrogen sulfite, pyrosulfurous acid, A salt of nitrous acid or thiosulfuric acid (hereinafter referred to as “sulfurous acid etc.” as appropriate) and an alkali metal (for example, sodium, potassium, etc.), sulfurous acid, etc. and an alkaline earth metal (for example, calcium, magnesium, etc.) Salts of sulfites, salts of sulfites and transition metals (eg, zinc, iron, cobalt, copper, etc.), salts of sulfites and basic ammonium, sulfites and salts of triethanolamine, sulfites and amino acids (eg, , L-histidine, L-arginine, L-lysine and the like) and the like.

From the standpoint of significantly suppressing degradation of pemetrexed or its salt during storage and coloring of the injection solution, the specific compounds are sodium sulfite, sodium bisulfite, sodium pyrosulfite, potassium sulfite, potassium bisulfite, and pyrosulfite. It is preferably at least one selected from the group consisting of potassium, more preferably at least one selected from the group consisting of sodium sulfite, sodium bisulfite, and sodium pyrosulfite.
The injection solution preparation in the present invention may contain one kind of specific compound or two or more kinds.

  The content of the specific compound in the injectable liquid preparation is 0.001 mass relative to the total mass of the injectable liquid preparation from the viewpoint of significantly suppressing degradation of pemetrexed or a salt thereof during storage and coloring of the injectable liquid preparation. % To 1.0% by mass, more preferably 0.001% to 0.25% by mass, and further preferably 0.001% to 0.1% by mass. preferable.

  The viewpoint that the content ratio of pemetrexed or a salt thereof and a specific compound in an injection solution formulation (pemetrexed or a salt thereof: a specific compound) significantly suppresses degradation of pemetrexed or a salt thereof during storage and coloring of the injection solution Therefore, it is preferably 2.5: 1 to 2500: 1 on a mass basis, more preferably 10: 1 to 2500: 1, and further preferably 25: 1 to 2500: 1.

(Aqueous solvent)
The injection liquid preparation in the present invention contains 50% by mass or more of an aqueous solvent with respect to the total mass of the injection liquid preparation.
In the present invention, the aqueous solvent is not particularly limited, and examples thereof include water, a mixed solvent with a water-miscible medium, and the like. The water is not particularly limited as long as it is water that can be used for injection preparations, and includes water for injection (purified water for injection), physiological saline, distilled water, glucose solution, ultrapure water, and the like. .
An aqueous solvent may contain arbitrary components, such as an organic acid, an organic base, an inorganic acid, an inorganic base, or these salts which function as a pH adjuster.
Further, the aqueous solvent may be a buffer solution having a buffer capacity.

  The content of the aqueous solvent contained in the injection liquid preparation of the present invention is preferably 60% by mass or more, more preferably 70% by mass or more, based on the total mass of the injection liquid preparation. More preferably, it is 80 mass% or more, and most preferably 90 mass% or more.

(Ascorbic acid, ascorbic acid derivatives, and salts thereof)
The injection preparation of the present invention may further contain at least one selected from the group consisting of ascorbic acid, ascorbic acid derivatives, and salts thereof (hereinafter collectively referred to as “ascorbic acid etc.” as appropriate). preferable.
When the injection preparation of the present invention further contains ascorbic acid or the like, decomposition of pemetrexed or a salt thereof during storage can be significantly suppressed.

  A commercial item can be used as ascorbic acid. Commercially available products include “Bischoline” (trade name) manufactured by Daiichi Fine Chemical Co., Ltd., “Vitamin C” (trade name) manufactured by Mitsubishi Tanabe Pharma Corporation, and “Ascorbic acid source” manufactured by Takeda Pharmaceutical Co., Ltd. “Takeda” (trade name), “Vitamin C” (trade name) manufactured by Towa Kasei Kogyo Co., Ltd., “Ascorbic Acid” (trade name) manufactured by BASF, and “Ascorbic Acid” manufactured by DSM Co., Ltd. (Brand name) etc. are mentioned.

The ascorbic acid derivative is not particularly limited as long as it is a pharmacologically acceptable ascorbic acid derivative. For example, ascorbic acid alkyl ester, ascorbic acid phosphate ester, ascorbic acid glucoside, ascorbic acid alkyl ether and the like Can be mentioned.
More specifically, ascorbic acid derivatives include ascorbic acid such as ascorbyl monostearate, ascorbyl monopalmitate, ascorbyl monoisopalmitate, ascorbyl monooleate, ascorbyl distearate, ascorbyl dipalmitate, ascorbyl monopalmitate, etc. Ascorbic acid monoglucoside, ascorbic acid diglucoside, such as alkyl ester, ascorbic acid monophosphate, ascorbic acid diphosphate, ascorbic acid phosphate such as ascorbic acid triphosphate, ascorbic acid ethyl ether, ascorbic acid methyl ether, etc. Examples include ascorbic acid glucoside. These ascorbic acid derivatives have a structure in which at least one of the 6-position, 2-position, 3-position and 5-position hydroxyl groups of ascorbic acid is substituted.

  Among these, the ascorbic acid derivative is preferably at least one selected from the group consisting of ascorbic acid phosphate ester, ascorbic acid glucoside, and ascorbic acid alkyl ether, and from the group consisting of ascorbic acid phosphate ester and ascorbic acid glucoside. At least one selected is more preferable.

  A commercial item can be used as an ascorbic acid derivative. As commercial products, ascorbic acid 2-glucoside (trade name: Asco Fresh, Hayashibara Co., Ltd.), ascorbyl magnesium phosphate (trade name: PM of ascorbic acid, Showa Denko KK), sodium ascorbyl phosphate (product) Name: Ascorbic acid PS, manufactured by Showa Denko KK) and the like.

The salt of ascorbic acid or an ascorbic acid derivative may be a pharmacologically acceptable salt, such as a salt of ascorbic acid or an ascorbic acid derivative and an alkali metal (for example, sodium, potassium, etc.), ascorbic acid or ascorbic acid A salt of a derivative and an alkaline earth metal (eg, calcium, magnesium, etc.), a salt of an ascorbic acid or ascorbic acid derivative and a transition metal (eg, zinc, iron, cobalt, copper, etc.), an ascorbic acid or an ascorbic acid derivative Salts with basic ammonium, salts of ascorbic acid or ascorbic acid derivatives with triethanolamine, salts of ascorbic acid or ascorbic acid derivatives with amino acids (for example, L-histidine, L-arginine, L-lysine, etc.) Can be mentioned.
Among these, ascorbic acid or a salt of an ascorbic acid derivative is preferably sodium ascorbate, potassium ascorbate, magnesium ascorbate, calcium ascorbate, sodium ascorbate phosphate, magnesium ascorbate phosphate, or the like.
In the injection solution preparation of the present invention, when ascorbic acid or the like is contained, one kind of ascorbic acid or the like may be contained, or two or more kinds may be contained.

When the injection liquid preparation of the present invention contains ascorbic acid or the like, the content of ascorbic acid or the like is 0.001% by mass or more and 1.0% by mass or less in terms of ascorbic acid with respect to the total mass of the injection liquid preparation. Preferably there is.
When the content of ascorbic acid or the like is in the range of 0.001% by mass to 1.0% by mass in terms of ascorbic acid, with respect to the total mass of the injection solution, decomposition of pemetrexed or a salt thereof during storage It can be more significantly suppressed.
In addition, from the viewpoint of further significantly suppressing the degradation of pemetrexed or a salt thereof during storage, the content of ascorbic acid or the like is 0.005% by mass or more with respect to the total mass of the injection preparation in terms of ascorbic acid. It is more preferably 0.5% by mass or less, further preferably 0.005% by mass or more and 0.1% by mass or less, and particularly preferably 0.007% by mass or more and 0.1% by mass or less. .
Here, “ascorbic acid equivalent” means the mass of ascorbic acid itself, and the ascorbic acid derivative, ascorbic acid salt, and ascorbic acid derivative salt are derived from the ascorbic acid contained in the derivative and salt. It means that the mass of the partial structure is adopted and calculated.

(PH adjuster)
The injection solution preparation of the present invention preferably further contains a pH adjuster.
The pH adjuster is not particularly limited as long as it is pharmacologically acceptable and can maintain the pH of an injection solution exceeding 6.0.
Specific examples of the pH adjuster include hydrochloric acid, sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, phosphoric acid or a salt thereof, citric acid or a salt thereof, tartaric acid or a salt thereof, acetic acid or a salt thereof Succinic acid or salt thereof, lactic acid or salt thereof, gluconic acid or salt thereof, adipic acid or salt thereof, fumaric acid or salt thereof, boric acid or salt thereof, maleic acid or salt thereof, methanesulfonic acid or salt thereof, apple It is at least one selected from the group consisting of acids or salts thereof, triethanolamine, monoethanolamine, diisopropanolamine, triisopropanolamine, trometamol (trishydroxymethylaminomethane), glycine, meglumine, and disodium edetate Preferably, hydrochloric acid, sodium hydroxide, phosphoric acid or a salt thereof Citric acid or salts thereof, triethanolamine, trometamol (tris hydroxymethyl aminomethane), and, more preferably at least one selected from the group consisting of edetate disodium.

The phosphate or citrate may be any salt that is pharmacologically acceptable, and is a salt of phosphoric acid or citric acid and an alkali metal (for example, sodium, potassium, etc.), phosphoric acid or citric acid and an alkali. Salts with earth metals (eg calcium, magnesium etc.), salts with phosphoric acid or citric acid and transition metals (eg zinc, iron, cobalt, copper etc.), phosphoric acid or citric acid and basic ammonium Examples thereof include salts, salts of phosphoric acid or citric acid and triethanolamine, salts of phosphoric acid or citric acid and amino acids (for example, L-histidine, L-arginine, L-lysine and the like) and the like.
Among these, as the phosphate or citrate, disodium hydrogen phosphate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, trisodium citrate, disodium citrate, sodium dihydrogen citrate and the like are preferable. .
In the injection solution preparation of the present invention, when a pH adjuster is contained, one kind of pH adjuster may be contained, or two or more kinds thereof may be contained.

When the injection preparation of the present invention contains a pH adjuster, the pH adjuster is at least one selected from the group consisting of citric acid and citrate from the viewpoint of suppressing the generation of insoluble foreign matter that may occur during storage. It is more preferable that at least one selected from the group consisting of trisodium citrate and disodium citrate is more preferable.
The content of the pH adjusting agent in the injection solution preparation is not particularly limited, and may be set as appropriate according to the type of the pH adjusting agent.

(Other ingredients)
The injection preparation of the present invention comprises pemetrexed or a salt thereof, a specific compound, an aqueous solvent, ascorbic acid as an optional ingredient, and a pH adjuster, as well as other pharmacologically acceptable ingredients. You may contain as needed within the range which does not impair the objective of this invention.
Other ingredients include isotonic agents, stabilizers, solubilizers, surfactants, persistence agents, antifoaming agents, colorants, emulsifiers, dispersants, preservatives, preservatives, solubilizers, solvents However, it is not limited to these. For example, the injection liquid preparation of the present invention includes antioxidants such as hindered phenolic antioxidants such as dibutylhydroxytoluene, butylhydroxyanisole, and tocopherol as other components in addition to the specific compound and ascorbic acid which is an optional component. An agent may be contained.
The content of other components can be appropriately set within the range where the effects of the present invention are exhibited.

  Isotonic agents include monosaccharides such as glucose and fructose, sugars such as sucrose, lactose, cellobiose, raffinose, dextran, chondroitin sulfate, hyaluronic acid, cyclodextrin, sugar alcohols such as sorbitol, mannitol, xylitol, chloride Inorganic salts such as sodium, potassium chloride, calcium chloride, magnesium chloride, calcium bromide, sodium bromide, sodium pyrophosphate, sodium bicarbonate, boric acid, borax, amines such as taurine, nicotinamide, benzalkonium chloride However, it is not limited to these.

The pH of the injection solution of the present invention exceeds 6.0.
The injection solution formulation of the present invention contains pemetrexed or a salt thereof, a specific compound, and an aqueous solvent of 50% by mass or more based on the total mass of the injection solution formulation, and has a pH exceeding 6.0, and is being stored. Of pemetrexed or a salt thereof and coloring of an injection solution can be suppressed.
The lower limit value of the pH of the injection liquid preparation of the present invention is more preferably 7.0 or more, and further preferably 7.5 or more. The upper limit value of the pH of the injection liquid preparation of the present invention is not particularly limited, but is preferably 13 or less, more preferably 12 or less, from the viewpoint of an acceptable range as an injection liquid preparation. .

In this specification, pH is measured at a temperature of 25 ° C. for the injection preparation.
The measurement of pH is not particularly limited, and a method generally used as a measurement method can be used. For example, pH can be measured with a pH meter (apparatus model number: F-73, manufactured by HORIBA, Ltd., pH electrode: micro-ToupH electrode 9618-10D).

The injection solution preparation of the present invention is enclosed in a container containing an injection solution preparation (corresponding to an injection solution preparation in a container) from the viewpoint of significantly suppressing degradation of pemetrexed or a salt thereof and coloring of the injection solution preparation, The oxygen concentration in the gas in the container is preferably 1.0% by volume or less, more preferably 0.5% by volume or less, and still more preferably 0.2% by volume or less.
The gas in the container is preferably replaced with an inert gas, and nitrogen is preferable as the inert gas. According to the inert gas (particularly nitrogen), the oxygen concentration in the gas in the container enclosing the injection solution preparation can be easily adjusted.

The measurement of the oxygen concentration in the gas in the container is not particularly limited, and a method generally used as a measurement method can be used. For example, oxygen monitor OXY-1 (manufactured by Zico Corporation) (measurement method: diaphragm type galvanic cell type) or residual oxygen meter pack master (manufactured by Iijima Electronics Co., Ltd.) (measurement method: diaphragm type galvanic cell type) Can be used to measure the oxygen concentration in the gas in the container.
As a measuring method, for example, when an injection liquid preparation is prepared while controlling the injection amount of nitrogen and oxygen so as to achieve a target oxygen concentration in the glove box, a sensor in the glove box is used. By reading the display value of the built-in oxygen monitor, measure the oxygen concentration in the gas (minimum resolution: 0.1%), or stab the sampler needle part of the oxygen concentration measurement device into the injection solution. There is a method of sucking the gas in the head space in the container of the injection liquid preparation and measuring the oxygen concentration in the gas (minimum resolution: 0.01%). In the case of the latter method, measurement is preferably performed in a nitrogen atmosphere in order to avoid contamination of oxygen outside the container during measurement.

The dissolved oxygen concentration in the injection preparation of the present invention is preferably 9 ppm or less. When the dissolved oxygen concentration in the injection liquid preparation is 9 ppm or less, the decomposition inhibitory effect of pemetrexed or a salt thereof contained in the injection liquid preparation and the coloration inhibitory effect of the injection liquid preparation can be improved.
The dissolved oxygen concentration in the injection preparation is more preferably 7 ppm or less, further preferably 3 ppm or less, particularly preferably 0.5 ppm or less, and most preferably 0.1 ppm or less.

In the present specification, the dissolved oxygen concentration of the injection preparation is not particularly limited. For example, InLab (registered trademark) ScienceProISM (manufactured by METTTLER TOLEDO), or residual oxygen meter pack master (Iijima Electronics Co., Ltd.) (Made by Co., Ltd.).
As a measuring method, specifically, dissolved oxygen is obtained by bringing an electrode of an oxygen concentration measuring device into contact with an injection solution in a glove box under a nitrogen atmosphere (oxygen concentration is 0.1% by volume or less). Measure the concentration. Alternatively, a method of measuring the dissolved oxygen concentration of the injection liquid preparation by puncturing the sampler needle portion of the oxygen concentration measuring device into the injection liquid preparation and sucking the liquid in the injection liquid preparation can be mentioned.

  In addition, when measuring the dissolved oxygen concentration in an injection solution stored for more than one day, it is considered that the oxygen dissolved in the injection solution and the oxygen present in the gas have reached equilibrium. Therefore, for example, by measuring the oxygen concentration in the gas from Henry's law, the oxygen concentration in the injection solution can be calculated.

Examples of the container that encloses the injection liquid preparation include vials, ampoules, and syringes. Among these, a vial bottle is preferable as a container for encapsulating an injection solution from the viewpoint of handleability in a medical field.
In addition, as a container for encapsulating an injection solution, a container in which the amount of silicon eluted in water when filled with water and heat-treated at 121 ° C. for 60 minutes is preferably 1.0 ppm or less, 0.5 ppm or less More preferred is a container.
Commercially available products can be used as containers for injecting liquid preparations, such as Resin CZ manufactured by Daikyo Seiko Co., Ltd., 3010, 3010 Silicote, FY-5, FY manufactured by Fuji Glass Co., Ltd. -5 Siricoat, FY-5 Sulfur treatment, CS-20 Siricoat, CS-30 Siricoat, CS-40 Siricoat, 23 × 43LA, 23 × 43VIST manufactured by Daiwa Special Glass Co., Ltd., etc. can be used.

In addition, the storage stability of pemetrexed or a salt thereof contained in an injection solution preparation can be improved by using an oxygen-blocking film as a packaging for a container enclosing the injection solution preparation.
As film materials, alumina-coated PET (polyethylene terephthalate), silica-coated PET, nanocomposite-coated PET, PET, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyvinyl chloride, polyvinylidene chloride, vinylidene chloride-methyl acrylate Copolymers, taxylylene adipamide 6 nylon, biaxially stretched nylon, unstretched nylon, biaxially stretched polypropylene, high density polyethylene, unstretched polypropylene, polycarbonate, polystyrene, low density polyethylene and the like are used.
From the viewpoint of storage stability, the oxygen gas permeability of the film is preferably 100 cm ³ / m ² · 24 h · atm or less, more preferably 10 cm ³ / m ² · 24 h · atm or less, more preferably 2 cm ^3. / M ² · 24h · atm or less is more preferable.
In addition, the container which encloses an injection solution formulation may be packaged in a single layer using an oxygen-blocking film, or may be packaged in multiple layers using a plurality of oxygen-blocking films.

In the injection solution preparation of the present invention, from the viewpoint of improving the storage stability of pemetrexed or a salt thereof, an oxygen scavenger may be loaded in any space between the container and the outermost package that packages the container.
As the oxygen scavenger, iron-based self-supporting oxygen scavenger (manufactured by Mitsubishi Gas Chemical Co., Ltd., Ageless ZP, Ageless ZJ-PT, Ageless ZJ-PK, Ageless S), iron-based moisture-dependent oxygen scavenger (Mitsubishi) Gas Chemical Co., Ltd., Ageless FX), non-ferrous self-supporting oxygen scavenger (Mitsubishi Gas Chemical Co., Ltd., Ageless GLS, Ageless GL-M, Ageless GT) and the like are used.

In the injection liquid preparation of the present invention, the ratio of the number of oxygen molecules to the number of pemetrexed molecules in the injection liquid preparation (oxygen molecules) from the viewpoint of significantly suppressing degradation of pemetrexed or a salt thereof during storage and coloring of the injection liquid preparation. (Number / pemetrexed molecule number) is preferably 0.0080 or less, more preferably 0.0020 or less, and still more preferably 0.0008 or less.
Here, the ratio of the number of oxygen molecules to the number of pemetrexed molecules in the injection liquid formulation (number of oxygen molecules / number of pemetrexed molecules) is the oxygen concentration in the gas in the container when the injection liquid formulation is sealed in the container, Calculated based on the sum of the dissolved oxygen concentration of the injection solution and the oxygen concentration obtained by subtracting the oxygen concentration in an equilibrium state. The ratio of the number of oxygen molecules to the number of pemetrexed molecules in the injection solution formulation (number of oxygen molecules / number of pemetrexed molecules) is determined when the injection solution formulation is not sealed in the container or the injection solution formulation is sealed in the container. When there is no (e.g. prefilled syringe), calculate based on the dissolved oxygen concentration of the injection solution

  In the present specification, the number of pemetrexed molecules in an injection solution formulation and the number of oxygen molecules in an injection solution formulation are calculated according to the following methods, respectively.

Formula 1. Number of molecules of pemetrexed (mol) = concentration of pemetrexed in injection preparation (mol / L) × volume of injection preparation (L)
Formula 2. Number of oxygen molecules in injection liquid preparation (mol) = Number of oxygen molecules in gas (mol) + Number of oxygen molecules in injection liquid preparation (mol)
Formula 3. Number of oxygen molecules in gas (mol) = oxygen concentration in gas (volume%) ÷ 100 × volume of gas in container (L) ÷ (0.082 × (273.15 + temperature (° C.))
Formula 4. Number of oxygen molecules in injection solution (mol) = dissolved oxygen concentration (mg / L) ÷ 32 ÷ 1000 × volume of injection solution (L)

  It should be noted that the temperature in Equation 3 is the sensor built in the glove box when the injection solution was prepared while controlling the injection amount of nitrogen and oxygen so that the measurement method was the target oxygen concentration in the glove box. When reading the display value of the oxygen monitor of the type, it means the temperature when sealed. On the other hand, when the measurement method is to stab the sampler needle part of the oxygen concentration measuring device in the injection solution and suck the gas in the injection solution to measure the oxygen concentration in the gas, the temperature in Equation 3 is Refers to the temperature.

<Method for producing injection preparation>
The method for producing an injection solution of the present invention comprises (i) pemetrexed or a salt thereof, (ii) sulfite or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfurous acid or a salt thereof, nitrous acid or a salt thereof, sulfur dioxide, and Preparing an injection solution containing at least one selected from the group consisting of thiosulfuric acid or a salt thereof, and (iii) 50% by mass or more of an aqueous solvent based on the total mass of the injection solution (hereinafter, As appropriate, referred to as “injection solution preparation step”), adjusting the pH of the injection solution to exceed 6.0 (hereinafter, appropriately referred to as “pH adjustment step”), and injection solution. Fill the container in an inert gas atmosphere (hereinafter referred to as “filling step” as appropriate), or fill the container with an injection solution, and then replace the gas in the container with an inert gas. (Hereinafter referred to as “replacement step Including the designated.) And.
The method for producing an injection solution of the present invention may include another step as necessary.
The injection solution thus prepared can exhibit the effect of inhibiting the degradation of pemetrexed or a salt thereof during storage and the effect of suppressing the coloring of the injection solution.
Hereinafter, the method for producing the injection liquid preparation of the present invention will be described. However, the matters common to the above-mentioned injection liquid preparation of the present invention, for example, the components contained in the injection liquid preparation, the amount thereof, containers, etc. will be described. Omitted.

(Injection solution preparation process)
The step of preparing an injection solution preparation in the method for producing an injection solution of the present invention comprises (i) pemetrexed or a salt thereof, (ii) sulfite or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfite or a salt thereof, nitrous acid or a salt thereof An injection solution formulation comprising at least one selected from the group consisting of a salt, sulfur dioxide, and thiosulfuric acid or a salt thereof, and (iii) 50% by mass or more of an aqueous solvent based on the total mass of the injection solution formulation It is a process of preparing.
In the injectable solution preparation step, the method is not particularly limited as long as the injectable solution preparation can be visually prepared in a uniform and clear solution. Examples of the method for preparing an injection solution preparation include pemetrexed or a salt thereof, sulfite or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfurous acid or a salt thereof, nitrous acid or a salt thereof, and sulfur dioxide while stirring an aqueous solvent. And at least one selected from the group consisting of thiosulfuric acid or a salt thereof are gradually added and dissolved in an aqueous solvent.

  The temperature condition for dissolving pemetrexed or a salt thereof in an aqueous solvent is not particularly limited, and may be appropriately set according to the composition (type and content) of the component dissolved in the aqueous solvent. it can. Usually, the temperature of the aqueous medium is set to 0 ° C. to 35 ° C., and pemetrexed or a salt thereof, sulfite or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfite or a salt thereof, nitrous acid or a salt thereof, sulfur dioxide And at least one selected from the group consisting of thiosulfuric acid or a salt thereof, and other components (including the optional components described above) as necessary.

(PH adjustment step)
The pH adjustment step in the method for producing an injection solution preparation of the present invention is a step of adjusting the pH of the injection solution preparation obtained in the injection solution preparation step so as to exceed 6.0.
In the pH adjustment step, the method for adjusting the pH is not particularly limited, and can be adjusted using, for example, the pH adjuster described above.
Moreover, the pH value of the injection liquid preparation adjusted in the pH adjustment step is a value measured by setting the temperature of the injection liquid preparation to 25 ° C.

  In the pH adjustment step, the pH of the injection liquid preparation is set to 7.0 or more from the viewpoint of obtaining an injection liquid preparation in which decomposition of pemetrexed or a salt thereof during storage and coloring of the injection liquid preparation can be significantly suppressed. It is preferable to adjust, and it is more preferable to adjust so that it may become 7.5 or more. From the viewpoint of a range acceptable as an injection solution preparation, the pH of the injection solution preparation is preferably adjusted so as not to exceed 13, and more preferably adjusted not to exceed 12.

(Filling process)
The filling step in the method for producing an injection liquid preparation of the present invention is a process of filling the injection liquid preparation into a container under an inert gas atmosphere.
In the filling step, the method of filling the injection liquid preparation into the container under an inert gas atmosphere is not particularly limited, and a known method can be adopted.
Nitrogen is preferred as the inert gas.

(Replacement process)
The replacement step in the method for producing an injection liquid preparation of the present invention is a step of replacing the gas in the container with an inert gas after filling the container with the injection liquid preparation.
In the replacement step, the method of replacing the gas in the container filled with the injection solution with an inert gas is not particularly limited, and a known method can be employed.
Nitrogen is preferred as the inert gas.

  In addition, about the general method of manufacturing an injection solution formulation, description, for example, Japanese translations of PCT publication No. 2003-521518 etc. can be referred.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples unless it exceeds the gist thereof.

<Example 1: Preparation of injection solution formulation (C-1)>
In a clean 50 mL vial containing a stir bar, 19.0 g of water for injection (manufactured by Hikari Pharmaceutical Co., Ltd.), sodium hydrogen sulfite (trade name: Japanese Pharmacopoeia sodium bisulfite "Production only", Wako Pure Chemical Industries, Ltd. 21 mg, pemetrexed disodium (525 mg as pemetrexed), trisodium citrate (trade name: trisodium citrate dihydrate, manufactured by Merck Millipore), and mannitol (trade name: Mannit P, Towa 567 mg (manufactured by Kasei Kogyo Co., Ltd.) was weighed and dissolved by stirring at room temperature for 10 minutes. The judgment that the mixed solution was uniform and became a clear solution was made by visual observation. Specifically, the appearance was visually observed, and when no undissolved residue was observed, it was determined that dissolution was complete.
To the obtained mixed solution, 1N (1 mol / L) hydrochloric acid (manufactured by Wako Pure Chemical Industries, Ltd.) is added little by little to adjust the pH value to 6.5, so that the total amount becomes 21.0 g. An injectable solution was obtained by adding water for injection.
The obtained injection solution preparation was placed in a glove box and stirred for 2 hours at room temperature in a nitrogen atmosphere, thereby replacing the gas in the injection solution with nitrogen (dissolved oxygen concentration: 0.01 ppm). Then, under a nitrogen atmosphere (oxygen concentration: 0.5 volume% to 0.7 volume%, temperature 25.0 ° C.), sterilizing and filtering with a 0.2 μm filter (manufactured by PTFE), A glass bottle manufactured by Glass Co., Ltd. was filled. In addition, the gas volume in the container at this time was 2.3 mL. Seal with a laminate-coated rubber stopper (Daikyo Seiko Co., Ltd.) and cover with an aluminum seal (Nidec Rika Co., Ltd., Aluminum Seal B (Medium)) to cover the vial and the mouth of the rubber stopper. By tightening with a clipper from above, the target injection solution formulation (C-1, pemetrexed content in injection solution formulation: 2.5 mass%, sodium bisulfite content in injection formulation: 0.1 mass%) Got.
In addition, it was confirmed by the method mentioned later that the oxygen concentration (0.5 volume%-0.7 volume%) of a container space does not change also in the sample in storage.

<Example 2: Preparation of injection solution formulation (C-2)>
Except that the amount of sodium bisulfite described in Example 1 was changed to 210 mg, the target injection solution formulation (C-2, pemetrexed content in injection solution formulation: 2.5) Mass%, sodium bisulfite content in the injection preparation: 1.0 mass%).
In addition, it was confirmed by the method mentioned later that the oxygen concentration (0.5 volume%-0.7 volume%) of a container space does not change also in the sample in storage.

<Example 3: Production of injection preparation (C-3)>
In a clean 15 mL vial containing a stir bar, water for injection (manufactured by Hikari Pharmaceutical Co., Ltd.) 7.00 g, sodium sulfite prepared beforehand (trade name: sodium sulfite, manufactured by Wako Pure Chemical Industries, Ltd.) 1 mg% aqueous solution of 90 mg, disodium pemetrexed (225 mg as pemetrexed), trisodium citrate (trade name: trisodium citrate dihydrate, manufactured by Merck Millipore), mannitol (trade name: Mann 243 mg of Knit P, manufactured by Towa Kasei Kogyo Co., Ltd., and 90 mg of an ascorbic acid 1% by weight aqueous solution (manufactured by DSM Nutrition Japan Co., Ltd.) prepared in advance were weighed, dissolved and stirred for 10 minutes at room temperature. A solution was obtained. The judgment that the mixed solution was uniform and became a clear solution was made by visual observation. Specifically, the appearance was visually observed, and when no undissolved residue was observed, it was determined that dissolution was complete.
To the obtained mixed solution, 1N (1 mol / L) hydrochloric acid (manufactured by Wako Pure Chemical Industries, Ltd.) is added little by little to adjust the pH value to 6.5, so that the total amount becomes 21.0 g. An injectable solution was obtained by adding water for injection.
Except for the above, in the same manner as in Example 1, the target injection preparation (C-3, pemetrexed content in the injection preparation: 2.5 mass%, sodium sulfite content in the injection preparation: 0.01 Mass%).
In addition, it was confirmed by the method mentioned later that the oxygen concentration (0.5 volume%-0.7 volume%) of a container space does not change also in the sample in storage.

<Example 4: Production of injection preparation (C-4)>
Except that the amount of the 1% by mass aqueous solution of sodium sulfite described in Example 3 was changed to 900 mg, the target injection solution formulation (C-4, pemetrexed content in the injection solution formulation) : 2.5 mass%, sodium sulfite content in the injection preparation: 0.1 mass%).
In addition, it was confirmed by the method mentioned later that the oxygen concentration (0.5 volume%-0.7 volume%) of a container space does not change also in the sample in storage.

<Example 5: Production of injection solution formulation (C-5)>
The target injection solution (C-5, pemetrexed in the injection solution) was prepared in the same manner as in Example 3, except that the amount of the 1% by mass aqueous solution of sodium sulfite described in Example 3 was changed to 9.0 mg. Content: 2.5% by mass, sodium sulfite content in the injection preparation: 0.001% by mass).
In addition, it was confirmed by the method mentioned later that the oxygen concentration (0.5 volume%-0.7 volume%) of a container space does not change also in the sample in storage.

<Example 6: Production of injection preparation (C-6)>
The amount of 1% by mass aqueous solution of sodium sulfite described in Example 3 was changed to 90 mg of 1% by mass aqueous solution of sodium pyrosulfite (trade name: Japanese Pharmacopoeia, sodium pyrosulfite, manufactured by Wako Pure Chemical Industries, Ltd.) Except for the above, in the same manner as in Example 3, the target injection preparation (C-6, pemetrexed content in the injection preparation: 2.5% by mass, sodium pyrosulfite content in the injection preparation: 0.01 Mass%).
In addition, it was confirmed by the method mentioned later that the oxygen concentration (0.5 volume%-0.7 volume%) of a container space does not change also in the sample in storage.

<Comparative Example 1: Preparation of injection solution formulation (R-1)>
In a clean 50 mL vial containing a stir bar, 18.0 g of water for injection (manufactured by Hikari Pharmaceutical Co., Ltd.) and pemetrexed disodium (525 mg as pemetrexed) were weighed and dissolved with stirring at room temperature for 10 minutes. The judgment that the mixed solution was uniform and became a clear solution was made by visual observation. Specifically, the appearance was visually observed, and when no undissolved residue was observed, it was determined that dissolution was complete.
To the obtained mixed solution, 1N (1 mol / L) hydrochloric acid (manufactured by Wako Pure Chemical Industries, Ltd.) is added little by little to adjust the pH value to 6.5, so that the total amount becomes 21.0 g. An injectable solution was obtained by adding water for injection.
The obtained injection solution preparation was placed in a glove box and stirred for 2 hours at room temperature in a nitrogen atmosphere to replace the gas in the solution with nitrogen (dissolved oxygen concentration: 0.01 ppm). Then, under a nitrogen atmosphere (oxygen concentration: 0.5 volume% to 0.7 volume%, temperature 25.0 ° C.), sterilizing and filtering with a 0.2 μm filter (manufactured by PTFE), A glass bottle manufactured by Glass Co., Ltd. was filled. In addition, the gas volume in the container at this time was 2.3 mL. Seal with a laminate-coated rubber stopper (Daikyo Seiko Co., Ltd.) and cover with an aluminum seal (Nidec Rika Co., Ltd., Aluminum Seal B (Medium)) to cover the vial and the mouth of the rubber stopper. The target injection solution formulation (R-1, pemetrexed content in the injection solution formulation: 2.5% by mass) was obtained by fastening with a clipper from above.
In addition, it was confirmed by the method mentioned later that the oxygen concentration (0.5 volume%-0.7 volume%) of a container space does not change also in the sample in storage.

  Table 2 shows the compositions of the injection liquid preparations (C-1) to (C-6) and (R-1). In addition, "-" in the column of prescription of Table 2 shows unblending. Moreover, the unit of the numerical value of the water for injection in Table 2 is the mass%.

The oxygen concentration in the gas in the container of each injection preparation was measured using the following measuring equipment. The measured values are shown in Table 2.
Measuring instrument: Residual oxygen concentration meter pack master (Iijima Electronics Co., Ltd.)
Measuring method: Diaphragm type galvanic cell type As a measuring method, specifically, a sampler of an oxygen concentration measuring device is used for an injection solution in a glove box under a nitrogen atmosphere (a gas oxygen concentration of less than 0.1 v / v%). The oxygen concentration in the gas is measured by puncturing the needle portion and sucking the gas in the injection liquid preparation.

  InLab (registered trademark) ScienceProISM (manufactured by METTLER TOLEDO Co., Ltd.) was used as a device for measuring the dissolved oxygen concentration in the injection solution formulation contained in each injection solution formulation. The dissolved oxygen concentration was measured by bringing the electrode of the oxygen concentration measuring device into contact with the injection preparation. The measured values are shown in Table 2.

  The ratio of the number of oxygen molecules to the number of pemetrexed molecules in each injection preparation (number of oxygen molecules / number of pemetrexed molecules) was calculated by the following method. The calculated values are shown in Table 2.

Formula 1. Number of molecules of pemetrexed (mol) = concentration of pemetrexed in injection preparation (mol / L) × volume of injection preparation (L)
Formula 2. Number of oxygen molecules in injection liquid preparation (mol) = Number of oxygen molecules in gas (mol) + Number of oxygen molecules in injection liquid preparation (mol)
Formula 3. Number of oxygen molecules in gas (mol) = oxygen concentration in gas (volume%) ÷ 100 × volume of gas in container (L) ÷ (0.082 × (273.15 + temperature (° C.))
Formula 4. Number of oxygen molecules in injection solution (mol) = dissolved oxygen concentration (mg / L) ÷ 32 ÷ 1000 × volume of injection solution (L)

[Evaluation]
About the obtained injection preparations (C-1) to (C-6) and (R-1), under a nitrogen atmosphere (oxygen concentration in the gas: 0.5 vol% to 0.7 vol%), A severe test was conducted in which a heat-sealed product was put into a lami zip (manufactured by Mitsubishi Gas Chemical Co., Ltd., Z-100PKC) and heat-sealed in a thermostat at 70 ° C. for 1 week.
Thereafter, the storage stability of the injection liquid preparation was evaluated from the viewpoint of decomposition of pemetrexed and coloring of the injection liquid preparation by the method described below. The evaluation results are shown in Table 2.

1. Storage stability (evaluation based on decomposition of pemetrexed)
About 10 mg of the injection preparation after the severe test was weighed into a 1 mL volumetric flask and diluted with ultrapure water to obtain a sample solution after the severe test. The injection solution preparation before the severe test was prepared by the same method to obtain a sample solution before the severe test.
The degradation product of pemetrexed was quantified by high performance liquid chromatography. As the degradation product of pemetrexed, the amount of degradation product (hereinafter referred to as “degradation product A”) detected at a retention time of 16.6 minutes was quantified under the following measurement conditions.

(HPLC measurement conditions)
Detector: UV detector (detection wavelength: 230 nm)
Column: manufactured by Shiseido Co., Ltd., CapcellPak C-18, UG120, 4.6 × 150 mm
Column temperature: 25 ° C
Developing solvent: A; 0.1 vol% phosphoric acid aqueous solution
B; Acetonitrile flow rate: 1.5 mL / min
Sample cooler temperature: 4 ° C
Injection volume: 5 μL

  Storage stability was evaluated using the amount of degradation product A generated by oxidation of pemetrexed as an index. The ratio (%) of the amount of degradation product A in the sample solution after the severe test to the amount of pemetrexed in the sample solution before the severe test is obtained based on the respective peak areas, and preservation as seen from the decomposition of pemetrexed according to the following evaluation criteria The stability was evaluated.

(Evaluation criteria)
AAA: Less than 0.060% AA: 0.060% or more and less than 0.100% A: 0.100% or more and less than 0.200% B: 0.200% or more

2. Storage stability (evaluation from the viewpoint of coloring of injection preparations)
The coloring of the injection preparation after the severe test was quantitatively evaluated using an ultraviolet-visible spectrophotometer (manufactured by JASCO Corporation, V-630). Specifically, a sample solution obtained by diluting an injection solution preparation after a severe test with ultrapure water 10 times was prepared, the absorbance at a wavelength of 420 nm was obtained, and the storage stability from the viewpoint of coloring of the injection solution preparation was determined according to the following evaluation criteria. Sexuality was evaluated.

(Evaluation criteria)
A: Less than 0.006 B: 0.006 or more

3. Comprehensive evaluation Comprehensive evaluation was performed according to the following evaluation criteria.
(Evaluation criteria)
AA: The evaluation from the viewpoint of decomposition is AAA or AA, and the evaluation from the coloring is A.
A: The evaluation from the viewpoint of decomposition is A, and the evaluation from the viewpoint of coloring is A.
B: The evaluation from the viewpoint of decomposition is B, or the evaluation from the viewpoint of coloring is B.

From the results of Table 2, it was revealed that the inclusion of a specific compound such as sodium bisulfite provided an injection solution in which decomposition of pemetrexed during storage and coloring of the injection solution were suppressed.
In addition, it was revealed that in addition to a specific compound such as sodium hydrogen sulfite, an injection solution in which the decomposition of pemetrexed was remarkably suppressed can be obtained by further containing ascorbic acid.

<Example 7: Production of injection solution formulation (C-7)>
1.00 g of water for injection (manufactured by Hikari Pharmaceutical Co., Ltd.) and sodium sulfite prepared in advance (trade name: sodium sulfite, manufactured by Wako Pure Chemical Industries, Ltd.) in a clean 50 mL vial containing a stir bar 1 mg% aqueous solution of 45 mg and disodium pemetrexed (37.5 mg as pemetrexed) were weighed and dissolved with stirring at room temperature for 10 minutes. The judgment that the mixed solution was uniform and became a clear solution was made by visual observation. Specifically, the appearance was visually observed, and when no undissolved residue was observed, it was determined that dissolution was complete.
To the obtained mixed solution, 1N (1 mol / L) sodium hydroxide (manufactured by Wako Pure Chemical Industries, Ltd.) was added little by little to adjust the pH value to 8.7, and the total amount was 1.50 g. An injection preparation was obtained by adding water for injection.
The obtained injection solution preparation was placed in a glove box and stirred for 2 hours at room temperature in a nitrogen atmosphere to replace the gas in the solution with nitrogen (dissolved oxygen concentration: 0.01 ppm). Thereafter, under a nitrogen atmosphere (oxygen concentration: less than 0.1% by volume, temperature 25.0 ° C.), it was sterilized by filtration with a 0.2 μm filter (manufactured by PTFE). Vial bottle NV-3). Seal with a rubber stopper (manufactured by Nidec Rika Glass Co., Ltd.) and cover with an aluminum seal (Nidec Rika Co., Ltd., aluminum seal B (small)) to cover the vial and the mouth of the rubber stopper. By tightening, the target injection solution formulation (C-7, pemetrexed content in the injection solution formulation: 2.5% by mass, sodium sulfite content in the injection solution formulation: 0.03% by mass) was obtained.
In addition, it was confirmed by the above-mentioned method that the dissolved oxygen concentration (0.01 ppm) and the oxygen concentration in the container space (less than 0.1% by volume) did not change even in the sample during storage.

<Example 8: Production of injection solution formulation (C-8)>
Except that the pH of the injection liquid preparation described in Example 7 was changed to 7.0, the target injection liquid preparation (C-8, pemetrexed content in the injection liquid preparation: 2. 5 mass%, sodium sulfite content in the injection preparation: 0.03 mass%).
In addition, it was confirmed by the above-mentioned method that the dissolved oxygen concentration (0.01 ppm) and the oxygen concentration in the container space (less than 0.1% by volume) did not change even in the sample during storage.

<Example 9: Production of injection preparation (C-9)>
45 mg of a 1% by mass aqueous solution of sodium sulfite described in Example 7 was added to 45 mg of a 1% by mass aqueous solution of sodium hydrogen sulfite (trade name: Japanese Pharmacopoeia Sodium Bisulfite “Production Only”, manufactured by Wako Pure Chemical Industries, Ltd.). Except for the change, the target injection solution formulation (C-9, pemetrexed content in the injection solution formulation: 2.5% by mass, sodium bisulfite content in the injection solution formulation, except that the change was made) 0.03% by mass) was obtained.
In addition, it was confirmed by the above-mentioned method that the dissolved oxygen concentration (0.01 ppm) and the oxygen concentration in the container space (less than 0.1% by volume) did not change even in the sample during storage.

<Example 10: Production of injection preparation (C-10)>
The target injection solution (C-10, containing pemetrexed in injection solution formulation) in the same manner as in Example 9, except that the amount of the 1% by mass aqueous solution of sodium hydrogensulfite described in Example 9 was changed to 150 mg. Amount: 2.5% by mass, sodium hydrogen sulfite content in the injection preparation: 0.1% by mass).
In addition, it was confirmed by the above-mentioned method that the dissolved oxygen concentration (0.01 ppm) and the oxygen concentration in the container space (less than 0.1% by volume) did not change even in the sample during storage.

<Example 11: Production of injection preparation (C-11)>
The target injection solution formulation (C-11, pemetrexed content in injection solution formulation: 2) in the same manner as in Example 10, except that the pH of the injection solution preparation described in Example 10 was changed to 7.0. 0.5% by mass, sodium hydrogen sulfite content in the injection preparation: 0.1% by mass).
In addition, it was confirmed by the above-mentioned method that the dissolved oxygen concentration (0.01 ppm) and the oxygen concentration in the container space (less than 0.1% by volume) did not change even in the sample during storage.

<Example 12: Production of injection preparation (C-12)>
The target injection solution (C-12, containing pemetrexed in the injection solution formulation) in the same manner as in Example 10, except that the amount of the 1% by mass aqueous sodium hydrogen sulfite solution described in Example 10 was changed to 450 mg. Amount: 2.5% by mass, sodium bisulfite content in the injection preparation: 0.3% by mass).
In addition, it was confirmed by the above-mentioned method that the dissolved oxygen concentration (0.01 ppm) and the oxygen concentration in the container space (less than 0.1% by volume) did not change even in the sample during storage.

<Comparative Example 2: Preparation of injection preparation (R-2)>
1.00 g of water for injection (manufactured by Hikari Pharmaceutical Co., Ltd.) and disodium pemetrexed (40.5 mg as pemetrexed) were weighed into a clean 50 mL vial containing a stir bar, and dissolved by stirring at room temperature for 10 minutes. The judgment that the mixed solution was uniform and became a clear solution was made by visual observation. Specifically, the appearance was visually observed, and when no undissolved residue was observed, it was determined that dissolution was complete.
To the obtained mixed solution, 0.1N (0.1 mol / L) sodium hydroxide (manufactured by Wako Pure Chemical Industries, Ltd.) was added little by little to adjust the pH value to 8.7, and the total amount was An injection solution formulation was obtained by adding water for injection to 1.50 g.
The obtained injection solution preparation was placed in a glove box and stirred for 2 hours at room temperature in a nitrogen atmosphere to replace the gas in the solution with nitrogen (dissolved oxygen concentration: 0.01 ppm). Thereafter, under a nitrogen atmosphere (oxygen concentration: less than 0.1% by volume, temperature 25.0 ° C.), it was sterilized by filtration with a 0.2 μm filter (manufactured by PTFE). Vial bottle NV-3). Seal with a rubber stopper (manufactured by Nidec Rika Glass Co., Ltd.) and cover with an aluminum seal (Nidec Rika Co., Ltd., aluminum seal B (small)) to cover the vial and the mouth of the rubber stopper. By tightening, an intended injection preparation (R-2, pemetrexed content in the injection preparation: 2.5 mass%) was obtained.
In addition, it was confirmed by the above-mentioned method that the dissolved oxygen concentration (0.01 ppm) and the oxygen concentration in the container space (less than 0.1% by volume) did not change even in the sample during storage.

<Comparative Example 3: Preparation of injection preparation (R-3)>
1.00 g of water for injection (manufactured by Hikari Pharmaceutical Co., Ltd.) and sodium sulfite prepared in advance (trade name: sodium sulfite, manufactured by Wako Pure Chemical Industries, Ltd.) in a clean 5 mL vial containing a stir bar A 1% by weight aqueous solution of 45 mg and disodium pemetrexed (37.5 mg as pemetrexed) were weighed and dissolved with stirring at room temperature for 10 minutes to obtain a mixed solution. In addition, 1N (1 mol / L) hydrochloric acid was added to the obtained mixed solution. (Wako Pure Chemical Industries, Ltd.) was added little by little to adjust the pH value to 6.0, and water for injection was added so that the total amount was 1.50 g. Except for the above, in the same manner as in Comparative Example 2, the target injection solution formulation (R-3, pemetrexed content in the injection solution formulation: 2.5 mass%, sodium sulfite content in the injection solution formulation: 0.03 mass) %)
In addition, it was confirmed by the above-mentioned method that the dissolved oxygen concentration (0.01 ppm) and the oxygen concentration in the container space (less than 0.1% by volume) did not change even in the sample during storage.

<Comparative Example 4: Preparation of injection solution formulation (R-4)>
45 mg of a 1% by weight aqueous solution of sodium sulfite described in Comparative Example 3 was added to 150 mg of a 1% by weight aqueous solution of sodium hydrogen sulfite (trade name: Japanese Pharmacopoeia Sodium Bisulfite “Production Only”, manufactured by Wako Pure Chemical Industries, Ltd.). The target injection solution formulation (R-4, pemetrexed content in the injection solution formulation: 2.5 mass%, sodium bisulfite content in the injection solution formulation, except that the change was made, in the same manner as in Comparative Example 3. 0.1% by mass) was obtained.
In addition, it was confirmed by the above-mentioned method that the dissolved oxygen concentration (0.01 ppm) and the oxygen concentration in the container space (less than 0.1% by volume) did not change even in the sample during storage.

  Table 3 shows the compositions of the injection liquid preparations (C-7) to (C-12) and (R-2) to (R-4). In addition, "-" in the column of prescription of Table 3 shows unblended. Moreover, the unit of the numerical value of the water for injection in Table 3 is the mass%.

[Evaluation]
About the obtained injection solution formulations (C-7) to (C-12) and (R-2) to (R-4), under a nitrogen atmosphere (oxygen concentration in gas: less than 0.1% by volume) A severe test was conducted in which a heat-sealed product was put into a lami zip (PET / AL) containing AGELESS (Mitsubishi Gas Chemical Co., Ltd., Z-100PKC) and stored in a thermostatic bath at 70 ° C. for 1 week. .
Thereafter, in the same manner as described above, the storage stability of the injection solution preparation was evaluated from the viewpoint of degradation of pemetrexed. The evaluation results are shown in Table 3.

From the results of Table 3, it was revealed that even if the injection solution contains a specific compound, when the pH is 6.0 or less, the effect of suppressing the degradation of pemetrexed during storage is hardly exhibited. .
It has been clarified that the injection preparation containing the specific compound has a markedly suppressed degradation of pemetrexed during storage as the pH is higher than 6.0.
It has been clarified that the decomposition of pemetrexed during storage is significantly suppressed in the injection liquid preparation containing sodium sulfite than in the injection liquid preparation containing sodium hydrogen sulfite.

Claims (6)

(I) ~ include (iii), is, by weight ratio of the content of (i) and the content of (ii) the content of ((content :( ii of i))), 2.5 : 1 to 2500: a 1, pH is not less than 7.0, the ratio of the number of oxygen molecules to pemetrexed number of molecules (oxygen molecules / pemetrexed number of molecules) of state, and are 0.0080 or less, injection It is sealed in a container enclosing the formulation, injection liquid preparations oxygen concentration in the gas in the container Ru der than 0.2 vol%.
(I) pemetrexed or a salt thereof (ii) 0.001% by mass or more and 0.1% by mass or less of sulfurous acid or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfurous acid or a salt thereof, based on the total mass of an injection solution formulation , 50 mass% or more of an aqueous solvent based on the total mass of at least one (iii) injection solution selected from the group consisting of nitrous acid or a salt thereof, sulfur dioxide, and thiosulfuric acid or a salt thereof Further, ascorbic acid, Injection formulation of claim 1 containing at least one ascorbic acid derivative, and selected from the group consisting of salts thereof. The content of at least one selected from the group consisting of ascorbic acid, ascorbic acid derivatives, and salts thereof is 0.001% by mass or more and 1.0% by mass with respect to the total mass of the injection preparation in terms of ascorbic acid. The injection solution preparation according to claim 2 , which is as follows. At least one selected from the group consisting of sulfurous acid or a salt thereof, hydrogensulfite or a salt thereof, pyrosulfurous acid or a salt thereof, nitrous acid or a salt thereof, sulfur dioxide, and thiosulfuric acid or a salt thereof is sodium sulfite, sodium hydrogensulfite, The injection liquid preparation according to any one of claims 1 to 3 , which is at least one selected from the group consisting of sodium pyrosulfite, potassium sulfite, potassium hydrogen sulfite, and potassium pyrosulfite. (I) pemetrexed or a salt thereof, and (ii) 0.001% by mass or more and 0.1% by mass or less of sulfurous acid or a salt thereof, hydrogen sulfite or a salt thereof, pyrosulfurous acid or a salt thereof Contains at least one selected from the group consisting of a salt, nitrous acid or a salt thereof, sulfur dioxide, and thiosulfuric acid or a salt thereof, and (iii) 50% by mass or more of an aqueous solvent based on the total mass of the injection liquid preparation Preparing an injectable solution formulation,
The ratio of the content of (i) and the content of ( ii ) in the injection preparation (content of (i): content of ( ii )) is 2.5: 1 to 2500: Adjusting to 1,
Adjusting the ratio of the number of oxygen molecules to the number of pemetrexed molecules in the injection preparation (number of oxygen molecules / number of pemetrexed molecules) to 0.0080 or less,
Adjusting the pH of the injection preparation to 7.0 or higher , and
Oxygen concentration in the gas in the container by filling the injection liquid preparation into the container under an inert gas atmosphere or by replacing the gas in the container with an inert gas after filling the container with the injection liquid preparation A method for producing an injectable solution preparation, comprising adjusting the content to 0.2% by volume or less . The method for producing an injection solution preparation according to claim 5 , wherein the inert gas is nitrogen.