Whole Blood Nucleic Acid Isolation on Roughened Plastic Comb Surfaces
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Solution Overview
Problem
Existing methods for nucleic acid extraction from whole blood using magnetic or paramagnetic particles face challenges such as purity issues, discolored eluates, and require complex preparatory steps, leading to inefficiencies and increased costs due to the use of these particles.
Innovation Solution
A method utilizing a mechanically roughened plastic comb surface and a wash buffer containing high concentrations of lithium chloride and ethanol for direct nucleic acid isolation from whole blood, eliminating the need for magnetic particles and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If magnetic or paramagnetic particles are used for nucleic acid extraction from whole blood, then nucleic acids can be bound and transported through automated processes, but the purity of isolated nucleic acids deteriorates and eluates become discolored
Solution Approach 1:
The invention extracts and removes the problematic magnetic or paramagnetic particles from the extraction system, replacing them with a magnetic comb that can be cleaned and reused. This eliminates the contamination source while preserving the automated magnetic manipulation capability, thereby improving nucleic acid purity without sacrificing automation extent.
Solution Approach 2:
Instead of using expensive magnetic particles that contaminate samples, the invention employs a reusable magnetic comb made of inexpensive magnetic material. The comb can be cleaned and sterilized between uses, effectively replacing single-use magnetic particles with a durable, cleanable alternative that maintains automation while improving purity.
2Reliability
If magnetic or paramagnetic particles are used for nucleic acid extraction, then binding and washing can be performed, but additional washing steps are required and nucleic acid loss occurs during particle collection
Solution Approach 1:
The invention extracts the nucleic acids from the magnetic particles directly into the elution buffer while the particles remain bound to the comb. This allows complete elution without the need to transfer particles between containers, eliminating nucleic acid loss that occurs during particle collection and transfer steps.
Solution Approach 2:
The magnetic comb serves as an intermediary structure that holds the magnetic particles stationary during elution. This allows elution buffer to be applied directly to the particle-bound nucleic acids without disturbing the particle position, enabling complete elution while particles remain fixed on the comb, thereby preventing nucleic acid loss.
3Quantity of substance
If magnetic particles are used in the extraction process, then nucleic acids can be isolated, but the process time increases due to repeated magnet collection steps
Solution Approach 1:
The invention removes the time-consuming steps of repeatedly collecting and redistributing magnetic particles between containers. The magnetic comb allows all extraction steps (washing, elution) to be performed in-place without particle transfer, significantly reducing process time while maintaining nucleic acid yield through complete elution.
Solution Approach 2:
The magnetic comb enables continuous processing by keeping magnetic particles in a fixed position throughout the entire extraction protocol. Washing buffers and elution buffers can be applied sequentially without interrupting the particle position, eliminating downtime associated with particle collection and redistribution steps.
4Extent of automation
If magnetic particles are used for extraction, then automation is achieved, but the cost increases due to particle consumption and processing complexity
Solution Approach 1:
The invention replaces expensive magnetic particles with an inexpensive magnetic comb that can be cleaned and reused indefinitely. The comb is made from cheap magnetic material and can withstand repeated sterilization cycles, dramatically reducing per-sample cost while maintaining full automation capability.
Solution Approach 2:
Instead of discarding magnetic particles after use, the invention recovers and reuses the magnetic comb through cleaning and sterilization protocols. The comb can be processed through the same automated system for cleaning, effectively recovering the extraction medium and eliminating the need for continuous particle replenishment.
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
Achieves high-quality nucleic acid yields with clean eluates in a fully automated, faster, and cost-effective manner without the need for magnetic particles.
Implementation Method 1
mechanical roughening of the plastic combs alone is sufficient to bind nucleic acids to said rough surface
Implementation Method 2
a wash buffer containing high concentrations of lithium chloride and ethanol for direct nucleic acid isolation
Data Source
AI summary
A method is developed for isolating nucleic acids from biological cells. After lysis of the cells, the nucleic acids contained in the cells are bound to a solid phase and treated with a wash buffer containing at least a lithium salt. A similar system is developed where the wash buffer includes a buffer known per se for lysis of biological cells; a buffer known per se for binding the nucleic acids from the lysed cells to a solid phase; a wash buffer containing at least a lithium salt; further wash buffers known per se; buffers for eluting the washed nucleic acids; and at least one solid phase comprising preferably a plastic material having a rough surface wherein said roughness of the surface is recognizable by looking at it or touching it and said rough surface can be immersed in the buffers mentioned.