Single-Particle Bridge Assay for Amplification-Free Biomolecule Detection
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Solution Overview
Problem
Current methods for detecting low concentrations of oligonucleotides, nucleic acids, antigens, antibodies, peptides, and non-biological molecules are time-consuming, require expensive equipment and reagents, and often rely on amplification procedures prone to errors, making them unsuitable for rapid, portable, and cost-effective detection.
Innovation Solution
The development of a single-particle bridge assay (SPBA) using capture nanoparticles that form a bridge with probe nanoparticles, allowing for the electrical detection of target molecules without amplification, enabling sensitive, fast, portable, and inexpensive detection of multiple diseases with a single kit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If amplification procedures (PCR, RCA, EXPAR) are used to detect low concentrations of biomolecules, then detection sensitivity is improved, but detection time increases and device complexity increases
Solution Approach 1:
The invention extracts and eliminates the amplification step from the detection process. By using a single-particle bridge assay where a target molecule directly bridges a capture nanoparticle and a probe nanoparticle, the method achieves detection without requiring PCR, RCA, or other amplification procedures, thereby reducing detection time while maintaining sensitivity.
Solution Approach 2:
The invention introduces nanoparticle bridges as intermediaries between the target molecule and the detection system. The capture nanoparticle and probe nanoparticle act as mediators that amplify the signal through their physical presence and electrical properties rather than through biochemical amplification, enabling direct detection of low-concentration targets.
2Measurement precision
If amplification procedures are used to detect low concentrations of biomolecules, then detection sensitivity is improved, but device complexity and cost increase
Solution Approach 1:
The invention removes the complex amplification apparatus and reagents from the detection system. By using a straightforward nanoparticle bridge formation assay, the method eliminates the need for thermal cyclers, specialized enzymes, and complex buffer systems required by PCR and other amplification methods, thereby reducing device complexity and cost.
Solution Approach 2:
The invention employs disposable nanoparticles as single-use detection elements. The capture nanoparticles and probe nanoparticles can be pre-functionalized and used in a simple, one-step assay, eliminating the need for expensive, reusable instrumentation and complex reagent preparation, thereby reducing both device complexity and operational cost.
3Measurement precision
If amplification procedures are used to detect low concentrations of biomolecules, then detection sensitivity is improved, but the detection system becomes less portable and more expensive
Solution Approach 1:
The invention extracts the detection capability from bulky, expensive instrumentation and consolidates it into microscopic nanoparticles. The single-particle bridge assay can be performed in simple microfluidic devices or even capillary tubes, making the system portable and suitable for point-of-care applications without sacrificing detection sensitivity.
Solution Approach 2:
The invention changes the scale and physical parameters of the detection system from macroscopic instrumentation to nanoscale particles. By detecting the electrical or optical signal from a single nanoparticle bridge, the system achieves high sensitivity in a miniaturized format that is portable and cost-effective, eliminating the need for large, expensive amplification equipment.
4Measurement precision
If amplification procedures are used to detect low concentrations of biomolecules, then detection sensitivity is improved, but the detection process becomes more prone to errors
Solution Approach 1:
The invention removes the error-prone amplification steps from the detection process. By using direct nanoparticle bridge formation, the method eliminates sources of error associated with PCR such as contamination, primer-dimer formation, and enzymatic variability, thereby improving reliability while maintaining the ability to detect low-concentration targets.
Solution Approach 2:
The invention employs a self-assembling nanoparticle bridge system where the target molecule naturally brings the capture and probe nanoparticles together through specific binding. This self-organizing process reduces the need for complex, error-prone manual operations and enzymatic reactions, improving the reliability and reproducibility of the detection assay.
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 SPBA allows for the detection of a single target molecule with reduced detection time and no need for amplification, providing a portable, cost-effective solution for simultaneous detection of various diseases, including HIV, Ebola, and anthrax, with results that can be communicated via smartphones.
Implementation Method 1
the nanoparticle bridge provides an electrical conduit between the source electrode and the drain electrode
Data Source
AI summary
The invention relates generally to devices, systems, compositions, and methods for the detection of oligonucleotides, nucleic acids, antigens, antibodies, peptides, proteins, and non-biological molecules.