Probe Compound for Simultaneous Fluorescence and Circular Dichroism Analysis
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Solution Overview
Problem
Current methods for measuring the optical purity of amine compounds containing aminoalcohols, such as high-performance liquid chromatography (HPLC), are time-consuming and costly, and existing CD probes face challenges in generating significant signals due to the lack of chromophores in these compounds, requiring separate receptors for fluorescence and CD measurements.
Innovation Solution
A novel probe compound, 1-(ortho-benzophenylaminoalkyl)-phenylboric acid, or its derivatives, forms an imine bond with aminoalcohols, creating a fluorescence chromophore with an N—B—N bond-containing hetero ring, enabling simultaneous fluorescence and CD analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If HPLC is used to measure optical purity of aminoalcohols, then measurement precision is improved, but measurement time and cost increase
Solution Approach 1:
The patent replaces the mechanical HPLC system with a spectroscopic method using circular dichroism (CD) and fluorescence. The probe compound forms a chiral complex with aminoalcohols that exhibits CD signals, and the reaction progress is monitored by fluorescence intensity changes, eliminating the need for complex chromatographic separation and significantly reducing measurement time while maintaining accuracy through the specific optical activity of the complex
Solution Approach 2:
The patent utilizes fluorescence and circular dichroism signal changes as optical indicators of the reaction between the probe compound and aminoalcohols. The probe exhibits specific fluorescence emission and CD signals upon complex formation, allowing real-time monitoring of the reaction progress and determination of optical purity through spectroscopic measurements rather than time-consuming chromatographic analysis
2Measurement precision
If HPLC is used to measure optical purity of aminoalcohols, then measurement precision is improved, but equipment cost and solvent consumption increase
Solution Approach 1:
The patent replaces expensive HPLC equipment with simpler and more affordable spectroscopic instruments (fluorescence spectrometer and CD spectrometer). The method uses a probe compound that forms fluorescent and CD-active complexes with aminoalcohols, allowing measurements to be performed with conventional spectroscopic equipment rather than requiring costly HPLC systems, thereby reducing both equipment investment and operational solvent costs
Solution Approach 2:
The patent employs a probe compound that can be used in small amounts and potentially replaced or regenerated. The probe forms reversible complexes with aminoalcohols, and the method requires minimal solvent consumption compared to HPLC mobile phases, reducing both equipment cost and ongoing operational expenses for solvent procurement and disposal
3Measurement precision
If diarylnaphthalene probe is used for CD measurement of aminoalcohols, then CD signal is generated, but fluorescence observation becomes difficult due to probe's own fluorescence
Solution Approach 1:
The patent separates the CD signal generation function from the fluorescence reporting function. The probe compound is designed to form a complex with aminoalcohols where the CD signal arises from the chiral arrangement of the probe itself, while the fluorescence signal comes from a distinct fluorophore within the complex. This allows independent optimization and clear detection of both signals without mutual interference
Solution Approach 2:
The patent creates different local environments within the probe-aminoalcohol complex for different signaling functions. The chiral center and aromatic rings provide the local structure for CD signal generation, while a separate fluorophore moiety provides the local environment for fluorescence emission. This spatial and functional differentiation allows both signals to be generated and detected simultaneously without one obscuring the other
4Measurement precision
If hydrogen bond between —OH group and N—O group is formed in diarylnaphthalene probe, then CD is enhanced, but CD change observation becomes difficult in methanol or water
Solution Approach 1:
The patent introduces a boronic acid group as an intermediary that forms a stable five-membered ring complex with the aminoalcohol through coordination to the boron atom. This boronate complex formation provides a more robust binding mode than hydrogen bonding alone, creating a stable chiral structure that maintains its CD signal characteristics across different solvent environments including methanol and water, thereby improving solvent compatibility while preserving CD enhancement
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 allows for rapid and cost-effective measurement of the concentration and optical purity of aminoalcohols, providing a single probe that generates both fluorescence and CD signals, overcoming the limitations of existing methods by forming a chiral structure and enhancing signal detection.
Implementation Method 1
forms an imine bond with aminoalcohols, creates a fluorescence chromophore
Implementation Method 2
A chiral compound absorbs differently R-circularly polarized light (R-CPL) and L-circularly polarized light (L-CPL). A technique of measuring the type and purity of a chiral compound by measuring CD (Circular Dichroism)
Data Source
AI summary
The present disclosure relates to a novel probe compound, i.e., 1-(ortho-benzophenylaminoalkyl)-phenylboronic acid, or its derivative for a fluorescence and/or circular dichroism (CD) sensor for amine compounds containing aminoalcohols. Also, the present disclosure relates to a simultaneous fluorescence and CD analysis method of of amine compounds containing aminoalcohols using the novel probe compound to obtain concentration and optical purity of the amine compounds.