Lyophilized BPA Preparation With pH-Controlled Dissolution
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Solution Overview
Problem
The cumbersome preparation process and difficulty in ensuring sterility of 4-boronophenylalanine (BPA) solutions for boron neutron capture therapy (BNCT) limit its clinical application, as BPA is difficult to dissolve in water and requires a solubilizer, and the preparation process is cumbersome, leading to potential contamination risks.
Innovation Solution
A method involving dissolving BPA and polyol in an aqueous solution with a base, regulating pH to 7.5-8.5, and freeze-drying under vacuum conditions to produce a lyophilized preparation, optimizing parameters like temperature and vacuum to ensure stability and low impurity content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If BPA is dissolved using a solubilizer and strong acid or base, then BPA can be dissolved in water, but the preparation process becomes cumbersome and sterility cannot be guaranteed
Solution Approach 1:
The patent applies preliminary action by pre-mixing BPA with polyol solubilizers and adjusting the pH to alkaline conditions before sterilization. This preliminary preparation ensures complete dissolution and stabilizes the solution, allowing for subsequent sterile filtration and lyophilization without requiring complex post-preparation adjustments or strong acids/bases during actual use.
Solution Approach 2:
The patent changes the pH parameter to alkaline conditions (pH 8.5-9.5) during the preparation stage, which fundamentally alters the solubility characteristics of BPA. This parameter change allows BPA to dissolve completely in aqueous solution with polyol solubilizers, eliminating the need for strong acids or bases later in the process and simplifying the overall preparation procedure.
2Ease of operation
If BPA is prepared as a solution for immediate use, then it can be applied to patients, but the cumbersome preparation process limits clinical application
Solution Approach 1:
The patent applies preliminary action by completing all preparation steps including dissolution, pH adjustment, and sterilization in advance, then lyophilizing the solution into a stable powder form. This allows the medication to be prepared beforehand and stored, eliminating the need for time-consuming preparation in clinical settings and enabling rapid reconstitution and administration when needed.
Solution Approach 2:
The patent utilizes phase transitions by lyophilizing (freeze-drying) the prepared BPA solution to convert it from liquid to solid powder form. This phase transition creates a stable, shelf-ready product that can be stored indefinitely and quickly reconstituted by adding sterile water, dramatically reducing preparation time in clinical settings while maintaining solution quality.
3Reliability
If freeze-drying is performed for extended periods, then the lyophilized preparation has good stability and low impurity content, but the preparation time increases
Solution Approach 1:
The patent applies preliminary action by thoroughly mixing BPA with polyol solubilizers and adjusting the pH to alkaline conditions before sterilization and freeze-drying. This preliminary preparation ensures complete dissolution and stabilizes the solution matrix, creating optimal conditions for efficient freeze-drying. The pre-stabilized solution requires less freeze-drying time to achieve the desired stability and low impurity content compared to improperly prepared solutions.
Solution Approach 2:
The patent changes multiple parameters including pH (to 8.5-9.5), temperature, and vacuum pressure during the freeze-drying process. By optimizing these parameters, particularly maintaining alkaline pH and using controlled temperature profiles, the patent achieves rapid sublimation and efficient moisture removal, reducing freeze-drying time while ensuring the lyophilized product has good stability and low impurity content.
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 method results in a lyophilized BPA preparation with good stability, quick dissolution, high purity, and low impurity content, addressing the challenges of preparation complexity and sterility issues.
Implementation Method 1
dissolving BPA and polyol in an aqueous solution by using a base to obtain a clear solution
Implementation Method 2
freeze-drying under vacuum conditions to produce a lyophilized preparation
Implementation Method 3
freeze-drying under vacuum conditions
Data Source
AI summary
A method for preparing a lyophilized preparation of BPA includes a solution preparation process and a freeze-drying process, where the solution preparation process includes: (1) dissolving BPA and polyol in an aqueous solution by using a base to obtain a clear solution; (2) regulating the clear solution back to 7.5<pH≤8.5 by using an acid, to obtain a BPA solution; and the freeze-drying process includes: (3) subpackaging the BPA solution and freeze-drying under a condition with a vacuum of 10-20 Pa, to obtain the lyophilized preparation. The lyophilized preparation of BPA prepared through the method has good stability and a small content of impurities.