Crystals of laquinimod sodium and improved process for the manufacture thereof
First Claim
1. A mixture of crystalline laquinimod sodium particles, wherein 1) (i) 90% or more of the total amount by volume of the laquinimod sodium particles have a size of 40 microns or less and (ii) 50% or more of the total amount by volume of the laquinimod sodium particles have a size of 15 microns or less, or 2) (i) 90% or more of the total amount by volume of the laquinimod sodium particles have a size of less than 40 microns and (ii) 50% or more of the total amount by volume of the laquinimod sodium particles have a size of less than 15 microns, and wherein:
- a) the mixture has a bulk density of 0.2 g/mL to 0.4 g/mL;
b) the mixture has a tapped density of 0.40 g/ml, to 0.7 g/ml;
c) an amount of heavy metal in the mixture is no more than 0.002% of heavy metal relative to the amount by weight of laquinimod sodium;
d) an amount of 5-chloro-4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinoline (MCQ) in the mixture is no more than 0.15% relative to the amount of laquinimod sodium as measured by HPLC;
e) an amount of 5-chloro-4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinoline-3-carboxylic acid (MCQCA) in the mixture is no more than 0.15% relative to the amount of laquinimod sodium as measured by HPLC;
orf) an amount of methyl 5-chloro-4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinoline-3-carboxylate (MCQME) in the mixture is no more than 0.12% relative to the amount of laquinimod sodium as measured by HPLC.
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Abstract
The subject invention provides a mixture of crystalline laquinimod sodium particles, wherein (i) 90% or more of the total amount by volume of the laquinimod sodium particles have a size of 40 microns or less or (ii) 50% or more of the total amount by volume of the laquinimod sodium particles have a size of 15 microns or less, and wherein:
- a) the mixture has a bulk density of 0.2 g/mL to 0.4 g/mL;
- b) the mixture has a tapped density of 0.40 g/mL to 0.7 g/mL;
- c) an amount of heavy metal in the mixture is no more than 0.002% of heavy metal relative to the amount by weight of laquinimod sodium;
- d) an amount of 5-chloro-4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinoline (MCQ) in the mixture is no more than 0.15% relative to the amount of laquinimod sodium as measured by HPLC;
- e) an amount of 5-chloro-4-hydroxy-1-methyl-2-oxo-1,2-dihydroqunoline-3-carboxylic acid (MCQCA) in the mixture is no more than 0.15% relative to the amount of laquinimod sodium as measured by HPLC; or
- f) an amount of methyl 5-chloro-4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinoline-3-carboxylate (MCQME) in the mixture is no more than 0.12% relative to the amount of laquinimod sodium as measured by HPLC.
76 Citations
22 Claims
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1. A mixture of crystalline laquinimod sodium particles, wherein 1) (i) 90% or more of the total amount by volume of the laquinimod sodium particles have a size of 40 microns or less and (ii) 50% or more of the total amount by volume of the laquinimod sodium particles have a size of 15 microns or less, or 2) (i) 90% or more of the total amount by volume of the laquinimod sodium particles have a size of less than 40 microns and (ii) 50% or more of the total amount by volume of the laquinimod sodium particles have a size of less than 15 microns, and wherein:
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a) the mixture has a bulk density of 0.2 g/mL to 0.4 g/mL; b) the mixture has a tapped density of 0.40 g/ml, to 0.7 g/ml; c) an amount of heavy metal in the mixture is no more than 0.002% of heavy metal relative to the amount by weight of laquinimod sodium; d) an amount of 5-chloro-4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinoline (MCQ) in the mixture is no more than 0.15% relative to the amount of laquinimod sodium as measured by HPLC; e) an amount of 5-chloro-4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinoline-3-carboxylic acid (MCQCA) in the mixture is no more than 0.15% relative to the amount of laquinimod sodium as measured by HPLC;
orf) an amount of methyl 5-chloro-4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinoline-3-carboxylate (MCQME) in the mixture is no more than 0.12% relative to the amount of laquinimod sodium as measured by HPLC. - View Dependent Claims (2, 3, 4, 5, 6, 7, 19, 20)
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8. A process of recrystallization of laquinimod sodium comprising:
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a) dissolving an amount of laquinimod sodium in water to form an aqueous solution; b) concentrating the aqueous solution to form a concentrated solution comprising approximately 1.7-1.9 mL of water per gram of laquinimod sodium; c) adding acetone to the concentrated solution of step b); and d) isolating recrystallized laquinimod sodium. - View Dependent Claims (9, 10, 11, 12, 15, 16, 17, 18, 21, 22)
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13. A mixture of crystalline laquinimod sodium particles, wherein (i) 90% or more of the total amount by volume of the laquinimod sodium particles have a size of 40 microns or less and (ii) 50% or more of the total amount by volume of the laquinimod sodium particles have a size of 15 microns or less, and wherein
a) an amount of aluminum in the mixture is less than 5 ppm relative to the amount by weight of laquinimod sodium; -
b) an amount of calcium, in the mixture is less than 60 ppm relative to the amount by weight of laquinimod sodium; c) an amount of copper in the mixture is less than 1 ppm, relative to the amount by weight of laquinimod sodium; d) an amount of iron in the mixture is less than 4 ppm relative to the amount by weight of laquinimod sodium;
ore) an amount of zinc in the mixture is less than 7 ppm relative to the amount by weight of laquinimod sodium. - View Dependent Claims (14)
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Specification