Raman Optical Barcoding With Doped Microbeads for Analyte Detection
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Solution Overview
Problem
Current methods for detecting biological molecules, such as nucleic acids and proteins, are limited in their ability to simultaneously and accurately analyze a large number of samples due to the complexity of biological systems at the cellular and subcellular level.
Innovation Solution
A Raman spectroscopy-based platform utilizing Raman-active small molecules (RASM) doped microbeads, each with unique concentrations and spectral patterns, allows for massively multiplexed detection by Stimulated Raman Scattering (SRS) or Spontaneous Raman Scattering to identify bound analytes, combined with fluorescence spectroscopy for enhanced detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence-based techniques are used for multiplexed detection, then detection capability is improved, but the multiplexing capability is limited compared to Raman spectroscopy
Solution Approach 1:
The patent uses Raman spectroscopy to detect unique spectral signatures (optical barcodes) of different bead types, analogous to color changes. Each bead type contains Raman-active small molecules at specific concentrations that produce distinct Raman spectra, enabling massively multiplexed detection beyond the limited spectral resolution of fluorescence techniques
Solution Approach 2:
The patent varies multiple parameters of the Raman-active small molecules including concentration, chemical structure, and spectral position to create millions of unique bead types. This multi-parameter encoding approach overcomes the limited multiplexing capability of fluorescence by exploiting the higher spectral resolution and broader detectable range of Raman spectroscopy
2Adaptability or versatility
If the number of bead types is increased to detect more analytes, then multiplexing capability is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal bead platform where millions of different bead types can be detected using a single Raman spectroscopy instrument. The binding molecules on the beads provide universal functionality for detecting various analytes (nucleic acids, proteins, peptides), while the Raman spectroscopy system provides universal detection capability across all bead types through spectral analysis
Solution Approach 2:
The patent uses Raman spectroscopy to create optical copies (spectral barcodes) of the bead information without requiring physical separation or complex handling of each bead type. The spectral signature serves as an information copy that identifies the bead type and its bound analyte, simplifying the detection system compared to methods requiring physical sorting or multiple detectors
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 method achieves high-throughput and accurate detection of multiple analytes with a sensitivity as low as 5 pg/ml for peptides and proteins, and 2 aM for nucleic acids, with a multiplexing capability of millions of unique bead types, surpassing fluorescence-based techniques.
Implementation Method 1
determining, with Stimulated Raman Scattering (SRS) or Spontaneous Raman Scattering, which bead type(s) having an analyte bound thereto are present
Implementation Method 2
determining, with Stimulated Raman Scattering (SRS) or Spontaneous Raman Scattering, which bead type(s) having an analyte bound thereto are present
Implementation Method 3
the first laser configured to excite Raman scattering from the sample with signature peaks at a first wavelength
Implementation Method 4
the second laser configured to generate an emission spectrum from the sample with wavelengths higher than the first wavelength
Implementation Method 5
the spectrometer comprising a diffraction grating that filters the Raman signal from the fluorescence frequency spectrum
Data Source
AI summary
A Raman spectroscopy-based platform for massively multiplexed detection of analytes of interest, such as nucleic acids or peptides, and a hardware platform for economical and high-throughput detection.