Cephem Purification via Active Carbon Adsorption
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Solution Overview
Problem
Current methods for producing cefditoren pivoxil, an antibacterial agent, fail to achieve high enough purity and yield of the Z-isomer, leading to significant E-isomer content which affects its antibacterial efficacy.
Innovation Solution
A process involving the use of a high porous polymer and/or active carbon to treat an aqueous solution of 7-amino-3-[(E/Z)-2-(4-methylthiazol-5-yl)vinyl]-3-cephem-4-carboxylic acid, enhancing the selectivity and yield of the Z-isomer by converting it into an alkali metal salt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If adsorption chromatography with ion exchange resin or active carbon is used to deplete the E-isomer, then the E-isomer content is reduced, but the Z-isomer content is not sufficiently improved and the process becomes complex and costly
Solution Approach 1:
The invention changes the pH parameter of the aqueous solution to convert the cephem compound into its alkali metal salt form. This parameter change enables selective adsorption of the E-isomer onto the active carbon, achieving high Z-isomer purity (99% or more) without requiring complex chromatography processes. The simple pH adjustment and filtration replace the complex ion exchange resin chromatography.
2Manufacturing precision
If adsorption chromatography is used to improve Z-isomer purity, then the E-isomer is removed, but the production cost increases due to recovery of eluent and regeneration of adsorbent
Solution Approach 1:
The invention extracts only the E-isomer from the mixture by selective adsorption onto active carbon in a simple filtration step. This extraction approach eliminates the need for complex chromatography with eluent recovery and adsorbent regeneration, significantly reducing energy consumption while achieving high Z-isomer purity.
Solution Approach 2:
The invention uses active carbon as a disposable adsorbent that can be simply filtered off after use. Unlike ion exchange resin that requires regeneration, the active carbon is discarded after one use, eliminating the energy-intensive regeneration process while maintaining high purification effectiveness.
3Manufacturing precision
If conventional methods are used to produce cefditoren pivoxil, then the production process is established, but the Z-isomer content is insufficient and E-isomer content remains high affecting antibacterial efficacy
Solution Approach 1:
The invention changes the pH parameter to convert the cephem compound into its alkali metal salt form, which enables selective adsorption of the E-isomer onto active carbon. This parameter change achieves high Z-isomer purity (99% or more), ensuring reliable antibacterial efficacy against gram-negative bacteria.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process achieves a Z-isomer content of at least 99% with an E-isomer content of less than 0.1%, significantly improving the purity and yield of the Z-isomer, thereby enhancing the antibacterial activity of cefditoren pivoxil.
Implementation Method 1
an aqueous solution of an alkali metal salt of 7-amino-3-[(E/Z)-2-(4-methylthiazol-5-yl)vinyl]-3-cephem-4-carboxylic acid of the formula (1) is treated with a high porous polymer and/or active carbon as added thereto
Data Source
AI summary
A process for preparing 7-amino-3-[(E/Z)-2-(4-methylthiazol-5-yl)vinyl]-3-cephem-4-carboxylic acid of the formula (1) and an alkali metal salt thereof, said acid and said salt being improved in the content of 7-amino-3-[(Z)-2-(4-methylthiazol-5-yl)vinyl]-3-cephem-4-carboxylic acid of the formula (2) or an alkali metal salt thereof, the process being characterized in that an aqueous solution of an alkali metal salt of 7-amino-3-[(E/Z)-2-(4-methylthiazol-5-yl)vinyl]-3-cephem-4-carboxylic acid of the formula (1) is treated with a high porous polymer and/or active carbon as added thereto.