Annexin V Stabilized Phage Preparations for High Concentration Stability
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Solution Overview
Problem
Current methods lack effective ways to generate highly concentrated, contaminant-free bacterial phage suspensions that are stable in solution for systemic injection, which is crucial for treating bacterial infections, especially those resistant to antibiotics.
Innovation Solution
The use of annexin V in conjunction with calcium ions to stabilize phage preparations, reducing bacterial contamination and aggregation, and achieving high concentrations (greater than 10^12 pfu/ml) for direct phage lysis of bacterial membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high concentration phage preparations are used to achieve rapid bacterial lysis, then treatment efficacy is improved, but phage aggregation and precipitation occur
Solution Approach 1:
Annexin V serves as an intermediary protein that binds to phage particles and prevents their aggregation. The annexin V-phage complex remains soluble at high concentrations, acting as a stabilizing agent that allows phage preparations to maintain high productivity without undergoing precipitation or self-association
2Reliability
If standard phage injection densities (10^7-10^8 pfu/ml) are used, then safety is maintained, but treatment duration is extended and bacterial resistance develops
Solution Approach 1:
The patent changes the concentration parameter of phage preparations from standard densities (10^7-10^8 pfu/ml) to high concentrations (>10^12 pfu/ml). This parameter change enables rapid bacterial lysis within hours rather than days, significantly reducing treatment duration while maintaining safety through controlled administration of stabilized phage preparations
3Productivity
If phage preparations are concentrated to high densities, then direct lysis capability is achieved, but bacterial contamination increases
Solution Approach 1:
The patent employs extraction and purification techniques to separate phage particles from bacterial contaminants. Through careful purification processes, high concentration phage preparations (>10^12 pfu/ml) are obtained with reduced bacterial contamination, allowing direct lysis capability while minimizing harmful factors in the formulation
4Duration of action of stationary object
If phage preparations are stored long-term, then availability is improved, but phage aggregation and loss of viability occur
Solution Approach 1:
Annexin V is added to phage preparations during the purification and concentration process, performing a preliminary stabilization action that prevents aggregation and maintains viability during long-term storage. This preliminary measure ensures that phage preparations retain high reliability and activity even after extended storage periods
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 approach allows for rapid reversal of lethal bacterial infections by achieving high local phage concentrations that can overwhelm bacterial populations, avoiding resistance mechanisms and interphage interference, and providing prolonged stability and reduced bacterial contamination.
Implementation Method 1
The formulations comprise annexin to stabilize the high concentration phage preparations
Implementation Method 2
The use of annexin V in conjunction with calcium ions to stabilize phage preparations
Implementation Method 3
Lysis from without, or direct phage lysis, occurs by the simultaneous direct interaction of many phages with the outer bacterial membrane
Data Source
AI summary
Methods are provided for the prevention of aggregation, simple purification stabilization and preservation of phage preparations for the use of treating bacterial infections.