Pradofloxacin Liquid Composition Stability
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Solution Overview
Problem
Pradofloxacin solutions are prone to oxidative degradation and precipitation, making them unstable and difficult to handle, especially in liquid injectable forms, which can lead to discoloration and reduced efficacy, and existing antioxidants often cause unwanted effects or fail to prevent these issues effectively.
Innovation Solution
A liquid composition comprising 1-30% pradofloxacin, 1-30% acid (preferably gluconic acid or methanesulfonic acid), and 0.01-1% antioxidant (preferably citric acid or thioglycerol) in an aqueous solution, with optional pharmaceutical auxiliaries, that maintains stability, prevents oxidation, and ensures suitable serum kinetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If liquid injectable form is used for pradofloxacin, then ease of operation and readiness for use is improved, but chemical stability and physical stability deteriorate due to oxidative degradation and precipitation
Solution Approach 1:
Antioxidants (citric acid, thioglycerol, ascorbic acid, or their combinations) are introduced as intermediary substances to protect pradofloxacin from oxidative degradation. These mediators scavenge free radicals and prevent oxidation reactions, allowing the liquid composition to maintain stability while remaining ready for immediate use without freeze-drying.
Solution Approach 2:
The pH of the liquid composition is adjusted to specific ranges (pH 2.0-4.0 preferably) through the addition of acids (citric acid, methanesulfonic acid, gluconic acid). This parameter change optimizes the chemical stability of pradofloxacin in liquid form by suppressing its ionization and reducing susceptibility to oxidation and precipitation.
2Stability of the object's composition
If antioxidants are added to prevent oxidative degradation, then chemical stability is improved, but unwanted effects occur and color maintenance fails
Solution Approach 1:
The patent employs composite antioxidant systems combining multiple antioxidants (citric acid, thioglycerol, ascorbic acid) in specific concentrations. This composite approach provides synergistic protection against oxidation while each component contributes different mechanisms, resulting in enhanced stability without the unwanted effects associated with single antioxidants used at high concentrations.
3Productivity
If high concentration of pradofloxacin is used, then productivity and treatment efficiency are improved, but precipitation tendency increases
Solution Approach 1:
The pH of the composition is optimized to acidic ranges (pH 2.0-4.0) which suppresses the ionization of pradofloxacin and reduces its tendency to precipitate. This parameter adjustment enables formulation of high concentrations (1-30% w/v, preferably 5-20%) while maintaining physical stability and preventing particle formation during storage.
4Stability of the object's composition
If freeze-dried products are used instead of liquid solutions, then chemical stability is improved, but ease of operation deteriorates due to difficult handling and limited shelf life after reconstitution
Solution Approach 1:
All stability-enhancing measures (pH adjustment, antioxidant addition, concentration optimization) are performed in advance during manufacturing to create a ready-to-use liquid composition that is stable without requiring freeze-drying. This preliminary stabilization eliminates the need for complex reconstitution procedures and provides immediate usability while maintaining long-term stability.
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 composition provides a stable, ready-to-use injectable form of pradofloxacin that prevents oxidative degradation, maintains color, and ensures effective serum kinetics, with good chemical and physical stability even at elevated temperatures, suitable for use in animals.
Implementation Method 1
The chemical stability of solutions can be increased for example by using antioxidants. The oxidative degradation of a constituent can thereby be prevented. Pradofloxacin is generally known to be sensitive to oxidation.
Data Source
AI summary
The invention relates to pharmaceutical compositions in liquid form comprising pradofloxacin in an aqueous solution and citric acid or thioglycerol as antioxidants.