Bacterial Extracellular Vesicle Purification via Calcium Precipitation
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Solution Overview
Problem
Current methods for isolating bacterial extracellular vesicles from bacterial cell cultures are inefficient, requiring extensive labor, expensive equipment, and result in low yield and purity, especially when processing large volumes, due to challenges in distinguishing these vesicles from similar-sized protein or nucleic acid particles.
Innovation Solution
The use of calcium or cobalt cations to form insoluble complexes with bacterial extracellular vesicles, allowing for their isolation and purification through centrifugation or precipitation, while inhibiting co-precipitation of impurities, followed by detachment of the cations to obtain high-purity vesicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultracentrifugation is used to isolate bacterial extracellular vesicles, then reliability of isolation is improved, but productivity is worsened due to low processing volume and time-consuming steps
Solution Approach 1:
The invention changes the physical-chemical parameters of the isolation system by introducing calcium or cobalt cations that selectively bind to extracellular vesicles, causing their precipitation. This chemical parameter change enables separation without requiring ultracentrifugation, thereby improving productivity while maintaining isolation reliability
Solution Approach 2:
The invention uses calcium or cobalt cations as intermediary substances that mediate the separation process. These cations act as bridges between the extracellular vesicles and the precipitation process, enabling selective isolation without direct mechanical force, thus resolving the contradiction between gentle isolation and high productivity
2Manufacturing precision
If size exclusion filtration is used to isolate extracellular vesicles, then manufacturing precision is improved with rapid high-purity isolation, but productivity is worsened due to low yield from vesicle adhesion and filtration loss
Solution Approach 1:
The invention converts the harmful effect of vesicle adhesion to filter surfaces into a beneficial precipitation process. By using calcium or cobalt cations, vesicles naturally aggregate and precipitate out of solution, transforming the adhesion problem into a controlled precipitation mechanism that improves both purity and yield
3Productivity
If polymer precipitation is used to isolate extracellular vesicles, then productivity is improved with low centrifugal force requirements, but manufacturing precision is worsened due to protein contamination from co-precipitation
Solution Approach 1:
The invention applies local quality by using specific calcium or cobalt cations that have selective affinity for extracellular vesicles rather than proteins. This selective binding creates a localized interaction between cations and vesicles, causing vesicle precipitation while leaving proteins in solution, thereby achieving both ease of isolation and high purity
4Manufacturing precision
If immunoaffinity isolation is used to purify extracellular vesicles, then manufacturing precision is improved with high specificity, but device complexity and cost are worsened due to antibody production requirements
Solution Approach 1:
The invention replaces expensive, complex antibodies with simple, inexpensive calcium or cobalt cations that can be easily obtained from common salts. These cations serve as disposable reagents that can be added to the sample, perform their selective binding function, and then removed along with the precipitated vesicles, eliminating the need for complex antibody production and purification systems
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 method enables rapid and simple large-scale purification of bacterial extracellular vesicles with high purity and yield, suitable for commercial-scale production, while preserving their structure and function, and is cost-effective without the need for expensive equipment or materials.
Implementation Method 1
bacterial extracellular vesicles form an insoluble complex with calcium cations or cobalt cations
Implementation Method 2
isolating the complex of the bacterial extracellular vesicles and the calcium cations or cobalt cations from the bacterial cell culture
Data Source
AI summary
The present invention relates to a method for mass purifying high-purity bacterial extracellular vesicles and, more specifically, the present invention relates to a method for quickly and conveniently isolating and purifying high-purity bacterial extracellular vesicles from a large amount of bacterial cell culture product by means of calcium or cobalt. The purification method of the present invention is appropriate for obtaining high-purity bacterial extracellular vesicles in a commercial scale by treating a large amount of bacterial cell culture product and, particularly, when using calcium which is innocuous to the human body, is more advantageous in purifying bacterial extracellular vesicles to be used in a drug for human body.