Polycationic Nucleic Acid Control for Stable Detection
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Solution Overview
Problem
Current nucleic acid detection methods require reliable and stable controls that are inert to reaction components, easily producible, quantifiable, and suitable for long-term storage, as existing controls face issues with sensitivity, preparation complexity, and potential infectivity.
Innovation Solution
A control comprising a polycationic particle, such as a polycationic polysaccharide like chitosan, complexed with a nucleic acid, forming nanoparticles or nanocapsules that are stable, non-infectious, and can be lyophilized for extended storage, allowing for precise quantification and use in nucleic acid detection methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If naked DNA or viral particles are used as controls, then the control can be detected, but the sensitivity may be compromised and the preparation complexity increases
Solution Approach 1:
The patent uses composite materials by combining polycationic particles (such as polylysine or chitosan) with nucleic acids to form control complexes. This composite structure protects the nucleic acid from degradation while maintaining detectability, resolving the contradiction between control reliability and preparation complexity.
Solution Approach 2:
The polycationic particle acts as an intermediary that binds to and protects the nucleic acid control material. This mediator function allows the control to remain stable and detectable without requiring complex preparation methods, thus improving reliability while reducing preparation complexity.
2Reliability
If viral particles are used as controls, then the control is packaged and protected, but the risk of infectivity increases
Solution Approach 1:
The patent employs synthetic polycationic particles (such as polylysine or chitosan) that are non-infectious and can be easily discarded after use. These artificial particles replace viral particles as control carriers, eliminating the infectivity risk while maintaining control stability through their protective function.
Solution Approach 2:
The patent creates a functional copy of the viral particle structure using synthetic polycationic particles that mimic the protective packaging function without the harmful biological properties. This copy allows the control to be stable and protected while completely eliminating the risk of infectivity.
3Duration of action of stationary object
If controls are made for long-term storage, then the control is stable, but the manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes parameter changes by adjusting the charge density and molecular weight of the polycationic particles to optimize binding with nucleic acids. These parameter modifications enable the control complex to remain stable during long-term storage while maintaining consistent quantification properties, thus resolving the contradiction between storage duration and manufacturing precision.
4Reliability
If polycationic particles are used to complex nucleic acids, then the control is protected and stable, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by separating the control system into two distinct functional components: the polycationic particle (providing protection and stability) and the nucleic acid (providing detectability). This segmentation allows each component to be optimized independently while maintaining overall simplicity in the control structure.
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
The control provides stable and reliable nucleic acid detection, maintaining integrity and quantifiability over time, even in challenging environments, without affecting the nucleic acid extraction or amplification processes, and is suitable for various sample types.
Implementation Method 1
a control (i.e., a complex comprising a polycationic compound and a control nucleic acid)
Data Source
AI summary
The present invention belongs to the field of nucleic acid detection, particularly in-vitro diagnostics. The invention concerns amongst others the amplification of at least one or more target nucleic acid that may be present in at least one sample using an inventive control, which comprises a particle comprising a polycationic compound and a nucleic acid. The present invention relates also to uses of the inventive controls, methods for the preparation, diagnostic tools and kits.