Plasma cleaning method with simultaneous depletion of endotoxins
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plasmid purification methods struggle with the efficient and effective removal of endotoxins, particularly during alkaline lysis, as they often result in endotoxins contaminating the purified DNA fraction, leading to complex procedures and potential clogging of filters.
Innovation Solution
A method utilizing a cylindrical depth filter impregnated with non-ionic detergent, such as Triton X-114, for lysate clarification, directly transferring the filtrate to a fluidically connected anion exchanger, and eluting the purified plasmid material without additional detergent-containing buffers, thereby reducing endotoxin binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filtration methods are used during alkaline lysis, then cell debris is removed, but endotoxins contaminate the purified DNA fraction and filters may clog
Solution Approach 1:
The filter is pre-impregnated with non-ionic detergent before the alkaline lysis process. This preliminary preparation allows the filter to immediately bind endotoxins when the lysate passes through it, preventing endotoxin contamination of the purified DNA fraction without requiring complex additional filtration steps
Solution Approach 2:
Non-ionic detergent acts as an intermediary substance that binds to endotoxins in the lysate. The detergent-loaded filter uses this intermediary to selectively remove endotoxins from the DNA preparation, achieving reliable endotoxin removal while maintaining simple filtration operation
2Reliability
If additional detergent-containing buffers are used in the purification process, then endotoxin binding is reduced, but additional incubation steps and process complexity are required
Solution Approach 1:
The non-ionic detergent is incorporated into the filter matrix before the purification process begins. This preliminary impregnation eliminates the need for subsequent detergent-containing buffers and additional incubation steps, achieving endotoxin depletion directly during filtration
Solution Approach 2:
The detergent function is extracted from the liquid buffer phase and integrated into the solid filter matrix. This extraction allows the detergent to be continuously available for endotoxin binding without requiring separate incubation steps, reducing process time while maintaining effective endotoxin removal
3Manufacturing precision
If centrifugation is used to separate insoluble components, then plasmid purification is achieved, but equipment complexity increases and potential contamination occurs during transfer
Solution Approach 1:
The patent replaces the mechanical centrifugation system with a filtration system. The detergent-loaded filter physically separates insoluble cellular components from soluble plasmid DNA through filtration, eliminating the need for centrifuges and complex equipment while maintaining high purification quality and reducing contamination risk
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a method for separating endotoxins during plasmid purification using a detergent-loaded cylindrical depth filter. Furthermore, a detergent-loaded cylindrical depth filter, a separation device, and a kit containing such a depth filter, suitable for the method according to the invention, are provided.