Pristine Graphene Biosensor Coatings for Reproducible Biomarker Detection
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Solution Overview
Problem
Robust and reproducible detection of biomarkers at nanomolar or lower concentrations remains challenging in existing technologies.
Innovation Solution
Development of graphene-based biosensors with pristine graphene nanosheets coated by a water-soluble organic and/or inorganic compound, featuring a functional group for binding and a peptide linkage that allows for high reproducibility and signal-to-noise ratio detection of biomarkers at picomolar or femtomolar concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional biosensors are used for biomarker detection, then detection capability is provided, but detection robustness and reproducibility at nanomolar or lower concentrations deteriorates
Solution Approach 1:
The patent employs a composite structure consisting of pristine graphene nanosheets combined with water-soluble organic and/or inorganic compounds. This composite material provides both the high sensitivity needed for nanomolar detection and the stability required for robust, reproducible measurements. The graphene core maintains detection precision while the coating layer enhances reliability through improved colloidal stability and resistance to non-specific binding.
Solution Approach 2:
The patent optimizes multiple parameters including the concentration of pristine graphene nanosheets, the type and concentration of water-soluble coating compounds, the peptide linkage structure, and the detectable moiety configuration. These parameter optimizations enable the biosensor to achieve both high measurement precision at nanomolar concentrations and reliable, reproducible detection by tuning the balance between sensitivity and stability.
2Measurement precision
If detection sensitivity is increased to detect nanomolar or lower concentrations, then measurement precision improves, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent introduces water-soluble organic and/or inorganic compounds as intermediary layers between the pristine graphene nanosheets and the aqueous environment. These intermediaries reduce non-specific binding and background noise while preserving the high sensitivity of graphene for target biomarker detection, thereby improving the signal-to-noise ratio at nanomolar concentrations.
Solution Approach 2:
The patent applies different functional properties to different parts of the biosensor structure: the pristine graphene core provides high sensitivity for detection, while the water-soluble coating layer provides noise reduction and stability. This local differentiation of qualities allows the system to simultaneously achieve high measurement precision and good signal-to-noise ratio.
3Adaptability or versatility
If multiple biomarkers are detected simultaneously, then detection versatility improves, but spectral overlap increases causing measurement interference
Solution Approach 1:
The patent divides the detection system into multiple independent detectable components, each with distinct excitation and emission spectra. By segmenting the detection channels and selecting fluorophores with minimal spectral overlap, the system achieves multiplex detection capability while maintaining measurement precision through reduced interference between channels.
Solution Approach 2:
The patent develops a universal graphene-based platform that can detect multiple different biomarkers simultaneously by attaching different peptide linkages and detectable moieties to the same core structure. This multi-functional design enables versatile multiplex detection while the distinct spectral properties of each detectable component maintain measurement precision.
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 biosensors enable stable detection of biomarkers with high reproducibility and signal-to-noise ratio, maintaining at least 95% particle suspension and a signal-to-noise ratio of 25 or higher, capable of detecting multiple biomarkers with minimal overlap in excitation and emission spectra.
Implementation Method 1
the coating layer and the peptide linkage are configured to set a quenching distance between the graphene nanosheets and the detectable moiety wherein the graphene nanosheet quenches the fluorescent signal of the detectable moiety
Implementation Method 2
the more than one pristine graphene nanosheets and/or the organic and/or inorganic compound of the coating layer are configured to present a functional group capable of binding a corresponding functional group in an aqueous solution
Data Source
AI summary
Provided herein are graphene biosensors and related core particles, compositions methods and systems in which more than one pristine graphene sheet is coated with a coating layer of an organic or inorganic material to provide a core graphene particle, to which detectable components comprising a detectable moiety and a peptide linkage are attached through binding of the peptide linkage.