Purification method of daptomycin

Abstract

The invention discloses a method for purifying daptomuycin. According to the method, half-purified daptomuycin is loaded on a gel type weak anion resin for combination at first and is eluted the next. The purification method provided in the invention enables obtained daptomuycin to have purity higher than 98%; the raw materials used in the method are easily available and cheap; therefore, it is easy to popularize and apply the method.

Description

technical field

[0001] The invention relates to the field of medicine purification, in particular to a method for purifying daptomycin. Background technique

[0002] Infections caused by gram-positive resistant bacteria are on the rise. Although vancomycin and other glycopeptide antibiotics have a certain therapeutic effect on these drug-resistant pathogens, such as methicillin-resistant Staphylococcus aureus, Staphylococcus epidermidis and Enterococcus resistant strains, The emergence of vancomycin-resistant Gram-resistant bacteria has made this trend more and more important, so there is an urgent need to find a class of antibiotics to combat drug-resistant bacteria.

[0003] Daptomycin is an antibiotic produced by Streptomyces roseospora, as figure 1 As shown, it is composed of thirteen amino acids, ten of which form an amino acid peptide ring, and three other amino acids are arranged in a line. Among the three amino acids, the terminal L-tryptophan is followed by a deca...

Examples

Embodiment 1

[0028] The semi-purified daptomycin of embodiment 1

[0029] With reference to the Chinese invention patent application (application number 01805212.6) and its divisional application (application number 200810087401.X) and the method disclosed in U.S. Patent US6696412B1, prepare semi-purified daptomycin, as follows:

[0030] Streptomyces roseospora was fermented under controlled conditions to obtain a daptomycin fermentation liquid. The fermentation broth is centrifuged or filtered to obtain a clear solution. The clarified fermentation broth was applied to anion exchange resin Mitsubishi FP-DA13, then washed with 0.03 mol / L NaCl at pH 6.5, and eluted with 0.3 mol / L NaCl at pH 6.5. Load the eluent onto the reverse phase resin HP-20ss, wash the HP-20ss column with 45% isopropanol, and elute with 55-60% isopropanol, and the purity of the liquid phase is about 90% by HPLC detection semi-purified daptomycin solution.

Embodiment 2

[0031] The daptomycin of embodiment 2 purification

[0032] According to the method of Example 1, a semi-purified daptomycin solution with a liquid phase purity of 90% was obtained, which was loaded onto Sephadex A25, which was pre-balanced with pH 7.0 acetate buffer. After daptomycin is bound to the resin, wash with 3 times column volume of pH 7.0 acetate buffer, and then use 10 times column volume of pH 7.0 acetate buffer containing 0.5mol / L NaCl to elute to obtain purified Daptomycin totomycin. Adopt HPLC to detect the purity of daptomycin, the result is 98.6%, as figure 2 shown.

Embodiment 3

[0033] The daptomycin of embodiment 3 purification

[0034] The semi-purified daptomycin solution with a liquid phase purity of 91% obtained according to the method in Example 1 was loaded onto Sephadex A25, which had previously used a pH 6.0 acetate buffer containing 2 mol / L urea balance. After daptomycin is bound to the resin, wash with 3 times column volume of pH 6.0 acetate buffer containing 2mol / L urea, and then use 10 times column volume of pH 6.0 buffer solution containing 0.2mol / L NaCl and 2mol / L urea Elute with acetic acid buffer, and detect by HPLC to obtain daptomycin with a purity of 98.5%.

technical field

[0001] The invention relates to the field of medicine purification, in particular to a method for purifying daptomycin. Background technique

[0002] Infections caused by gram-positive resistant bacteria are on the rise. Although vancomycin and other glycopeptide antibiotics have a certain therapeutic effect on these drug-resistant pathogens, such as methicillin-resistant Staphylococcus aureus, Staphylococcus epidermidis and Enterococcus resistant strains, The emergence of vancomycin-resistant Gram-resistant bacteria has made this trend more and more important, so there is an urgent need to find a class of antibiotics to combat drug-resistant bacteria.

[0003] Daptomycin is an antibiotic produced by Streptomyces roseospora, as figure 1 As shown, it is composed of thirteen amino acids, ten of which form an amino acid peptide ring, and three other amino acids are arranged in a line. Among the three amino acids, the terminal L-tryptophan is followed by a deca...

Examples

Embodiment 1

[0028] The semi-purified daptomycin of embodiment 1

[0029] With reference to the Chinese invention patent application (application number 01805212.6) and its divisional application (application number 200810087401.X) and the method disclosed in U.S. Patent US6696412B1, prepare semi-purified daptomycin, as follows:

[0030] Streptomyces roseospora was fermented under controlled conditions to obtain a daptomycin fermentation liquid. The fermentation broth is centrifuged or filtered to obtain a clear solution. The clarified fermentation broth was applied to anion exchange resin Mitsubishi FP-DA13, then washed with 0.03 mol / L NaCl at pH 6.5, and eluted with 0.3 mol / L NaCl at pH 6.5. Load the eluent onto the reverse phase resin HP-20ss, wash the HP-20ss column with 45% isopropanol, and elute with 55-60% isopropanol, and the purity of the liquid phase is about 90% by HPLC detection semi-purified daptomycin solution.

Embodiment 2

[0031] The daptomycin of embodiment 2 purification

[0032] According to the method of Example 1, a semi-purified daptomycin solution with a liquid phase purity of 90% was obtained, which was loaded onto Sephadex A25, which was pre-balanced with pH 7.0 acetate buffer. After daptomycin is bound to the resin, wash with 3 times column volume of pH 7.0 acetate buffer, and then use 10 times column volume of pH 7.0 acetate buffer containing 0.5mol / L NaCl to elute to obtain purified Daptomycin totomycin. Adopt HPLC to detect the purity of daptomycin, the result is 98.6%, as figure 2 shown.

Embodiment 3

[0033] The daptomycin of embodiment 3 purification

[0034] The semi-purified daptomycin solution with a liquid phase purity of 91% obtained according to the method in Example 1 was loaded onto Sephadex A25, which had previously used a pH 6.0 acetate buffer containing 2 mol / L urea balance. After daptomycin is bound to the resin, wash with 3 times column volume of pH 6.0 acetate buffer containing 2mol / L urea, and then use 10 times column volume of pH 6.0 buffer solution containing 0.2mol / L NaCl and 2mol / L urea Elute with acetic acid buffer, and detect by HPLC to obtain daptomycin with a purity of 98.5%.

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