Magnetic Bead Nucleic Acid Isolation via Anion Exchange
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Solution Overview
Problem
Current methods for isolating extracellular nucleic acids from large sample volumes are inefficient, requiring manual processing, multiple steps, and limited by robotic systems' capacity, often resulting in low yields and potential errors due to the need for lysis steps and large reagent volumes, which can reduce the sample volume that can be processed.
Innovation Solution
A method involving the use of an anion exchange material to bind extracellular nucleic acids at a specific pH, allowing for their efficient isolation without lysis steps and with minimal reagents, enabling the processing of larger sample volumes and automation, and pretreating the nucleic acid binding solid phase with a polymer like polyacrylic acid to improve recovery rates of smaller nucleic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If manual extraction methods are used to isolate extracellular nucleic acids from large sample volumes, then isolation completeness is improved, but processing time and labor intensity increase significantly
Solution Approach 1:
The patent replaces manual mechanical extraction operations with an automated magnetic bead-based system. Magnetic beads functionalized with nucleic acid-binding groups automatically capture extracellular nucleic acids from large sample volumes, eliminating the need for manual extraction steps while maintaining high isolation completeness. The magnetic separation process enables rapid processing of large volumes without proportional increases in processing time.
Solution Approach 2:
The patent introduces magnetic beads as an intermediary carrier that mediates the isolation process. These beads functionalized with specific binding groups serve as a bridge between the sample and the isolation system, enabling efficient capture and separation of extracellular nucleic acids. This intermediary approach allows automated processing while maintaining high recovery rates.
2Quantity of substance
If lysis steps and large reagent volumes are used in current isolation methods, then nucleic acid release is improved, but sample volume capacity is reduced
Solution Approach 1:
The patent extracts and eliminates the lysis step from the isolation workflow. Instead of using lysis reagents to release nucleic acids, the method directly captures intact extracellular nucleic acids from the sample using magnetic beads. This extraction of the lysis step removes the need for large reagent volumes while maintaining effective nucleic acid isolation.
Solution Approach 2:
The patent changes the binding conditions by adjusting pH and ionic strength parameters to optimize magnetic bead binding efficiency. By optimizing these parameters, the system achieves effective nucleic acid capture without requiring large volumes of reagents, thereby preserving sample volume capacity for processing larger initial samples.
3Productivity
If current isolation kits are used for large sample volumes, then processing capacity is improved, but automation compatibility deteriorates
Solution Approach 1:
The patent replaces manual操作步骤 with an automated magnetic bead-based system that can be integrated into robotic platforms. The magnetic separation process, buffer addition, and bead manipulation steps are all amenable to automation, enabling high-throughput processing while maintaining compatibility with automated systems.
Solution Approach 2:
The patent segments the isolation process into discrete, automatable steps: sample loading, magnetic bead addition, incubation, magnetic separation, washing, and elution. This segmentation enables each step to be independently controlled and automated, improving both processing capacity and automation compatibility.
4Quantity of substance
If multiple processing steps are used in current methods, then isolation thoroughness is improved, but error potential and complexity increase
Solution Approach 1:
The patent merges multiple isolation steps into a streamlined magnetic bead-based workflow. The capture, washing, and elution steps are integrated into a single magnetic bead process, reducing the number of transfer operations and potential error points while maintaining thorough isolation through optimized magnetic separation and washing conditions.
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 allows for rapid, high-yield isolation of extracellular nucleic acids from large volumes, reducing handling errors and increasing the recovery of small nucleic acids, making it suitable for automated systems and improving the detection of low-abundance target molecules.
Implementation Method 1
binding the extracellular nucleic acids to a solid phase which carries anion exchange groups, wherein said method comprises the following steps: a. binding the extracellular nucleic acids to the solid phase at a first pH which allows binding the extracellular nucleic acids to the anion exchange groups of the solid phase
Implementation Method 2
pretreating the nucleic acid binding solid phase with a polymer like polyacrylic acid to improve recovery rates of smaller nucleic acids
Data Source
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AI summary
The present invention pertains to a method for isolating extracellular nucleic acids from a sample, wherein said sample is optionally stabilized, by binding the extracellular nucleic acids to a solid phase which carries anion exchange groups, comprising the following steps: a. binding the extracellular nucleic acids to the solid phase in a binding mixture having a first pH which allows binding the extracellular nucleic acids to the anion exchange groups of the solid phase; b. separating the solid phase with the bound extracellular nucleic acids; c. optionally washing the extracellular nucleic acids; d. optionally eluting extracellular nucleic acids from the solid phase. The method has the advantage that large sample volumes can be processed and that extracellular nucleic acids can be isolated rapidly with a high yield. The method is particularly suitable for automatable processes.