Ferric Oxide Particles for miRNA Extraction from FFPE Tissues
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Solution Overview
Problem
Current methods for extracting microRNAs (miRNAs) from biological samples are inefficient, often requiring harsh chemicals like chloroform and phenol, and are not compatible with a wide range of sample types, including formalin-fixed paraffin-embedded (FFPE) tissues and blood samples, limiting their diagnostic and therapeutic applications.
Innovation Solution
A method involving contacting a biological sample with proteinase K followed by ferric oxide particles under acidic conditions, allowing magnetic separation and alkaline elution to release miRNAs, which can be used in various sample types without chloroform or phenol, facilitating efficient extraction and downstream applications like sequencing and diagnostics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional extraction methods using chloroform and phenol are employed, then nucleic acids can be extracted from biological samples, but the process becomes hazardous, time-consuming, and incompatible with diverse sample types including FFPE tissues and blood samples
Solution Approach 1:
The patent changes the chemical parameters by replacing traditional organic solvents (chloroform, phenol) with ferric oxide particles under controlled pH conditions. The method uses acidic conditions for binding and alkaline conditions for elution, fundamentally altering the extraction chemistry to be safer and more versatile across different sample types including FFPE tissues and blood samples
Solution Approach 2:
Ferric oxide particles serve as an intermediary binding agent between the biological sample and the extracted nucleic acids. These particles mediate the separation process through magnetic fields, eliminating the need for direct contact with harsh chemicals while enabling efficient extraction from diverse sample types
2Productivity
If traditional extraction protocols are used, then nucleic acids can be obtained, but the process requires multiple steps including centrifugation and organic solvent handling, increasing time and complexity
Solution Approach 1:
The patent replaces mechanical centrifugation with magnetic field-based separation using ferric oxide particles. This substitution eliminates the need for centrifuges and multiple washing steps, reducing the overall extraction time to under 30 minutes while simplifying the procedural complexity
Solution Approach 2:
The extraction process is segmented into distinct pH-based phases: acidic conditions for binding nucleic acids to ferric oxide particles, magnetic separation to isolate bound particles, and alkaline conditions for elution. This segmentation allows each step to be optimized independently and performed rapidly without requiring complex equipment
3Quantity of substance
If conventional extraction methods are applied, then miRNAs can be extracted, but yield and sensitivity are limited, particularly for low-abundance miRNAs in complex matrices
Solution Approach 1:
Ferric oxide particles act as high-capacity binding intermediaries that efficiently capture miRNAs from complex biological matrices. The large surface area and magnetic properties of these particles enable thorough binding and separation, significantly improving extraction yield and detection sensitivity for low-abundance miRNAs compared to traditional methods
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, safe, and efficient extraction of miRNAs from diverse biological samples, improving yield and sensitivity, and is compatible with FFPE tissues and blood, making it suitable for diagnostic and therapeutic applications.
Implementation Method 1
contact with ferric oxide particles under acidic conditions to induce binding between the ferric oxide particles and nucleic acids
Implementation Method 2
the particles are magnetically separated from the sample
Implementation Method 3
contacted with an alkaline elution buffer to release the nucleic acids
Data Source
AI summary
Methods and compositions for extracting nucleic acids such as microRNAs (miRNAs) from biological samples are provided. Aspects of the methods include contacting a biological sample with proteinase K followed by contact with ferric oxide particles under acidic conditions to induce binding between the ferric oxide particles and nucleic acids (e.g., miRNAs) of the sample. In some cases, the ferric oxide particles are provided as part of a dissolvable film, which releases the ferric oxide particles upon solvation. In some embodiments, after nucleic acids bind to the ferric oxide particles, the particles are magnetically separated from the sample and are contacted with an alkaline elution buffer to release the nucleic acids.