PEG Virus Concentration via Modified Precipitation
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Solution Overview
Problem
Current methods for concentrating and purifying microscopic substances, such as viruses, from biological samples are complex, time-consuming, and unsuitable for mass preparation, with low target recovery and foreign substance removal rates, limiting their effectiveness in detecting pathogens like SARS-CoV-2 and noroviruses.
Innovation Solution
A modified PEG precipitation method is developed by adding polysaccharides like glycogen to PEG solutions with optimized salt concentrations, along with sodium hydroxide, chelating agents like EGTA, reducing agents like DTT, and protein components like BSA, to enhance virus recovery and detection in biological samples, allowing for direct amplification and detection without prior purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional PEG precipitation or ultracentrifugal methods are used to concentrate viruses, then virus concentration is achieved, but the procedures become complicated and time-consuming with low recovery rates
Solution Approach 1:
The patent introduces an intermediary substance (polyethylene glycol or PEG) that mediates the concentration process by causing viral particles to precipitate out of solution. This intermediary approach simplifies the procedure compared to complex ultracentrifugation equipment while achieving effective virus concentration through the PEG-induced precipitation mechanism.
2Quantity of substance
If conventional PEG precipitation or ultracentrifugal methods are used to concentrate viruses, then virus concentration is achieved, but the procedures become time-consuming
Solution Approach 1:
The patent optimizes critical parameters including PEG concentration (typically 8-20% w/v), salt concentration (e.g., 150-500 mM NaCl), pH (usually 7.0-8.0), and incubation temperature (4°C to room temperature) to achieve rapid and efficient virus concentration. By carefully controlling these parameters, the method reduces procedure time while maintaining high recovery rates.
3Quantity of substance
If conventional methods are used to concentrate viruses, then some concentration is achieved, but foreign substance removal rate is low
Solution Approach 1:
The patent applies local quality differentiation by using specific PEG molecular weight ranges (e.g., PEG 6000-8000) and optimizing local chemical conditions (salt type, pH, temperature) to selectively concentrate viral particles while allowing foreign substances to remain in solution. This localized optimization of conditions enhances the purity of the concentrated virus preparation.
4Loss of time
If simple concentration methods are used, then procedure time is reduced, but detection sensitivity decreases due to foreign substance interference
Solution Approach 1:
The patent performs preliminary concentration and partial purification of viral particles before the actual detection step. By pre-concentrating the virus using optimized PEG precipitation and removing a significant portion of foreign substances in advance, the detection sensitivity is enhanced while keeping the overall procedure time short. This preliminary preparation ensures that subsequent detection methods work with high-purity samples.
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 efficiently concentrates and detects viruses in large volumes of biological samples with high sensitivity, overcoming limitations of previous methods by improving virus recovery and reducing foreign substance interference, enabling early detection of highly pathogenic viruses and monitoring of reemergence.
Implementation Method 1
The ultracentrifugal and polyethylene glycol (PEG) precipitation methods are often used to concentrate and purify microscopic substances in living organisms, environments, and foods.
Implementation Method 2
adding polysaccharides such as glycogen to PEG at an optimal concentration
Implementation Method 3
adding sodium hydroxide, chelating agents like EGTA, reducing agents like DTT
Implementation Method 4
chelating agents like EGTA
Implementation Method 5
reducing agents like DTT
Data Source
AI summary
A method for concentrating and detecting minute amounts of microscopic substances (especially pathogenic viruses) present in aqueous solutions containing biological materials such as saliva, throat wipes, and fecal suspension at three-digit microliter level volumes by adding basic substance, chelating agent, reducing agent, and protein component to PEG solutions. By combining PEG solution with these reagents and highly sensitive detection technology, it has become possible to detect and monitor microscopic substances such as viruses present in large volumes of biological samples and environmental and food materials easily, rapidly, and sensitively. As a result, it is now possible to contribute to the prevention of virus infection in the medical field and/or public and food safety field, etc.