Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
  • C07K7/04—Linear peptides containing only normal peptide links
  • C07K7/06—Linear peptides containing only normal peptide links having 5 to 11 amino acids
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
  • C07K1/14—Extraction; Separation; Purification
  • C07K1/30—Extraction; Separation; Purification by precipitation

Definitions

• the present invention relates to the purification of peptides, in particular intermediate-size peptides, more particularly nona- and decapeptides, such as LHRH-antagonists.
• the LHRH antagonist (I) and nona- and decapeptides of similar structure are essentially pure.
• the raw product obtained in the last step of a multiple-step synthesis is purified by chromatographic and other methods. To eliminate residual solvent from the chromatography a thus purified product usually has to be dissolved in an aqueous medium and freeze- dried. This is a costly process producing a voluminous product which is not easy to handle.
• a process of purification of an otherwise pure peptide from residual organic solvent by other means than freeze-drying thus is desirable.
• a process of purification of an otherwise pure peptide, in particular a nona- or decapeptide, most particularly a nona- or decapeptide which is an LHRH antagonist, from residual organic solvent comprising the following steps: - dissolving said otherwise pure peptide in a dissolution solvent mixture comprising water and at least one alcohol selected from methan ⁇ l, ethanol, propanol, isopropanol;
• a vigorously stirred precipitation solvent mixture essentially consisting of one or several polar compounds selected from methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, ethyl isopropionate, butyl acetate, isobutyl acetate, t-butyl acetate, ethyl formate, propyl formate, isopropyl formate, and one or several non- polar compounds selected from hexane, heptane, octane, cyclohexane, methylcyclohexane, and, optionally, of up to 5% of acetic or propionic acid;
• An otherwise pure peptide is a peptide which is sufficiently pure for use in a medicine except for volatile impurities which need to be removed or the content of which needs to be substantially reduced.
• the otherwise pure peptide will normally be a substance having undergone purification by chromatography.
• the otherwise pure peptide is N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N
• the water content of the dissolution solvent mixture is below 5% (v/v) .
• the volume ratio of the dissolution solvent mixture and the precipitation solvent mixture is at least 15, in particular at least 20.
• the alcohol of the dissolution solvent mixture is ethanol .
• the polar component of the precipitation solvent mixture is ethyl acetate.
• the non-polar component of the precipitation solvent mixture is heptane .
• Example 1 The fractions containing pure compound (1) (100 g in total) in ethanol-water-acetic acid 40:59:1 (v/v/v) obtained from preparative HPLC by which the synthetically obtained product had been purified were pooled and concentrated in vacuo to an oil which was co-evaporated twice from ethanol. The resulting solid was dissolved in 440 ml of ethanol and the resulting clear solution added over a period of 20 min to 8.8 L of ethyl acetate/heptane 1:1 (v/v). Stirring was continued for 1 hour and filtered. The amorphous product was washed with 3 L of ethyl acetate; it was found that this removed nearly all heptane. The washed product was dried in a vacuum oven at 40oC at 0.3 bar for 48 hrs .
• Example 2 Variation of the composition of the precipitation solvent or solvent mixture; otherwise, procedure as in Example 1.
• Precipitation in pure ethyl acetate results in from about 3% to about 5% by weight loss of peptide.
• Precipitation in pure heptane results in a sticky pr.oduct which is difficult to filter.
• a 1:1 (v/v) mixture of ethyl-acetate hexane gives a product which is easy to filter and dry; in repeated experiments the loss of peptide was always less than 0.5% by weight.
• Example 3.Variation of water content of the solution of oily product in the dissolution solvent (absolute ethanol) otherwise, procedure as in Example 1.
• a water content of 10% (v/v) results in a sticky product on precipitation which is difficult to filter.
• a water content of 15% (v/v) results in an oily product on precipitation.
• the water content must not exceed 8% (v/v) but should preferably be kept below 5% (v/v) .
• a water content below 5% is accomplished by co-evaporating the oily product from the chromatography at least twice with ethanol.
• Example 4 Variation in precipitation temperature; otherwise, procedure as in Example 1.
• the precipitation temperature proved to be not critical. It could be varied from 0°C to 20°C without noticeable differences in product yield and morphology.
• Example 5 Variation of concentration of (I) in the dissolution solvent; otherwise, procedure as in Example 1. It was found that the concentration of the oily product from the chromatography which had been co-evaporated with ethanol in the dissolution solvent should be as high as possible. Even a concentration of 330 g by weight could be used.
• Example 6 Variation of ratio between dissolution solvent and precipitation solvent volumes and other variations; otherwise, procedure as in Example 1. The optimum ratio was found to be about 1:20. It could be shown that ratios from 1:15 to 1:30 gave satisfactory results. A ratio of 1:10 resulted in a sticky product. Precipitation is very fast. The suspension can be filtered 30 min after the last addition of dissolved substance. Washing with ethyl acetate did not result in loss of product but efficiently removed heptane.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Genetics & Genomics (AREA)
• Biochemistry (AREA)
• Biophysics (AREA)
• General Health & Medical Sciences (AREA)
• Health & Medical Sciences (AREA)
• Medicinal Chemistry (AREA)
• Molecular Biology (AREA)
• Proteomics, Peptides & Aminoacids (AREA)
• Life Sciences & Earth Sciences (AREA)
• Analytical Chemistry (AREA)
• Peptides Or Proteins (AREA)
• Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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