Micafungin Crystalline Powder via Three-Phase Solvent System
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Solution Overview
Problem
Micafungin, a cyclic peptide compound used as an anti-fungal drug, has poor stability and is difficult to crystallize, leading to issues with degradation during storage and processing, particularly due to its amorphous form and high bulk density, which complicates filtration and drying, resulting in reduced quality and stability.
Innovation Solution
A crystalline powder of Micafungin with a column-like morphology and low bulk density is achieved through a three-phase solvent system, specifically using aqueous methanol/isobutanol, methanol/isopropanol, or methanol/n-propanol solutions, allowing for easier filtration and solvent removal, and characterized by specific X-ray powder diffraction patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the compound of formula I is precipitated by adding acetone and ethyl acetate, then the compound can be obtained, but the solvent content is high (Dry/Wet=0.25) and drying time must be extended, causing increased degradation products and reduced quality
Solution Approach 1:
The invention changes the solvent system parameters from acetone/ethyl acetate to a three-phase system (aqueous phase, organic phase, and interfacial phase), which fundamentally alters the precipitation characteristics and reduces solvent entrapment in the crystal structure
Solution Approach 2:
The invention introduces an intermediary substance (specific surfactant or co-solvent) that mediates between the compound and solvent, enabling easier solvent removal while maintaining crystal integrity and reducing degradation
2Ease of manufacture
If the compound is in amorphous form, then it can be obtained through simple precipitation, but it has poor stability and is affected by degradation products during transportation and storage
Solution Approach 1:
The invention utilizes phase transition from amorphous to crystalline state through controlled crystallization in a three-phase solvent system, transforming the compound into a stable crystal form with defined melting point and reduced molecular mobility that prevents degradation
Solution Approach 2:
The invention creates a composite crystalline structure where the compound forms a stable lattice with specific solvent molecules or counterions trapped in defined positions, creating a composite material with enhanced stability compared to pure amorphous form
3Shape
If needle-like crystals of B82 type are obtained, then the crystal form is achieved, but the bulk density is high (0.8 g/mL) and filtration and drying are difficult, requiring increased drying temperature or time that increases degradation
Solution Approach 1:
The invention changes the crystal morphology from asymmetric needle-like shape to more symmetric equant or prismatic shapes, which pack less densely and allow better fluid penetration during filtration and drying operations
Solution Approach 2:
The invention transforms the crystal growth from one-dimensional needle-like elongation to three-dimensional equant growth, changing the dimensional characteristics and improving flow and filtration properties
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
The resulting crystalline powder exhibits improved stability, easier filtration, and reduced solvent content, facilitating industrial production with enhanced quality and stability compared to the previous needle-like crystal form.
Implementation Method 1
A crystalline powder of Micafungin with a column-like morphology and low bulk density is achieved through a three-phase solvent system
Implementation Method 2
characterized by specific X-ray powder diffraction patterns
Data Source
Figure 1~2
AI summary
Disclosed is a crystalline powder of a cyclic peptide compound, represented by formula I is the structure of same, and, also disclosed are a preparation method for same and uses thereof.