Mass-Sensing Biosensor Multimer Detection
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Solution Overview
Problem
Current methods for analyzing protein or peptide multimers in samples are either slow and complex, like size-exclusion chromatography, or require specific monoclonal antibodies, such as in immunoassays, and do not accurately distinguish between biologically active and inactive molecules, which is crucial for therapeutic applications where multimers may have lower activity or cause side effects.
Innovation Solution
A method using mass-sensing biosensors to determine the active concentration of macromolecules by measuring molecular weight and diffusion coefficient, allowing for the detection of multimers without calibration standards, by comparing the active concentration to total concentration ratios in samples with and without multimers, and correlating the difference to the presence and composition of multimers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If size-exclusion chromatography is used to analyze protein multimers, then multimer detection is achieved, but the method is slow and complex to perform
Solution Approach 1:
The patent replaces the mechanical chromatography system with a biosensor-based optical detection system. The biosensor measures binding events in real-time through optical signal changes, eliminating the need for complex chromatographic separation and reducing analysis time while maintaining multimer detection accuracy.
Solution Approach 2:
The patent changes the detection parameter from physical separation (chromatography) to binding affinity measurement (biosensor). By measuring the binding characteristics of multimers to a specific ligand on the sensor surface, the method achieves rapid detection without requiring complex mechanical separation processes.
2Measurement precision
If immunoassays are used to detect multimers, then specific antibody binding is achieved, but specific monoclonal antibodies are required
Solution Approach 1:
The patent employs a universal biosensor platform that can detect multiple types of multimers using a single sensor chip design. The sensor surface can be functionalized with different ligands to detect various target proteins, eliminating the need for separate monoclonal antibody reagents for each target and simplifying the overall system complexity.
Solution Approach 2:
Instead of requiring expensive and difficult-to-produce monoclonal antibodies, the patent uses a biosensor system that creates a digital copy of the binding interaction through optical signal measurement. The sensor detects binding events through changes in optical properties, replacing the need for physical antibody reagents with a measurable signal that can be replicated and analyzed.
3Quantity of substance
If UV or NIR absorption spectrometry is used to measure total concentration, then total macromolecule concentration is determined, but biologically active concentration cannot be distinguished
Solution Approach 1:
The patent applies local quality by measuring the binding characteristics of individual macromolecule molecules to a specific ligand on the sensor surface. Instead of measuring total concentration uniformly, the sensor detects the local binding events that occur only between active molecules and their specific ligands, thereby distinguishing biologically active from inactive molecules based on their local interaction properties.
Solution Approach 2:
The patent introduces a ligand as an intermediary between the macromolecule and the detection system. The ligand on the sensor surface acts as a mediator that selectively binds to active macromolecules, allowing the system to indirectly measure biological activity through the binding interaction rather than directly measuring the macromolecule itself.
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 approach enables rapid and convenient analysis of multimers, providing an accurate estimation of biologically active concentrations, thereby aiding in the purification and optimization of protein preparations by distinguishing between monomeric and multimeric forms without the need for calibration standards.
Implementation Method 1
active concentration measurement by a sensor of mass-sensing type may be used to detect the presence of and analyse the composition of multimers of a macromolecule
Implementation Method 2
the observed rate of binding is partially or completely limited by transport of analyte molecules to the sensor surface, i.e. partially or completely controlled by diffusion
Data Source
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AI summary
A method of determining multimers of a macromolecule monomer in a sample containing the macromolecule comprises the steps of (i) determining the total concentration of macromolecule in the sample, (ii) determining by a biosensor-based detection method, especially mass-sensing, the active concentration of macromolecule in the sample, wherein physical characteristics of the macromolecule monomer are used, (iii) comparing the relationship of determined active macromolecule concentration to total macromolecule concentration for the sample with a corresponding relationship for an at least substantially multimer-free macromolecule- containing sample, and (iv) from a resulting difference determining the presence of multimers in the sample. The method may be used in the purification of macromolecules, such as proteins.