Boronic Acid Magnetic Complex for Sialic Acid Concentration
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Solution Overview
Problem
Existing methods for detecting sialic acid in biological fluids, particularly for early cancer diagnosis, face challenges due to the trace amounts present and the inability to effectively concentrate and collect this biomarker for comprehensive cancer testing.
Innovation Solution
A complex comprising a boronic acid group with a binding constant of 500 M^-1 or more and a magnetic particle, chemically bonded through a linker, is used to selectively bind and concentrate sialic acid, followed by pH-adjusted recovery and dissociation steps to enhance detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ELISA method utilizing antigen-antibody reaction is used for cancer detection, then detection of advanced cancer is effective, but detection of early cancer with trace amounts of cancer-derived components is not feasible
Solution Approach 1:
The invention segments the detection approach by first isolating and concentrating sialic acid from complex biological fluids using magnetic particles functionalized with boronic acid, then performing detection on the concentrated fraction. This two-stage process (concentration followed by detection) enables detection of trace amounts of cancer-derived components that would be undetectable by conventional ELISA methods alone
Solution Approach 2:
The invention performs preliminary concentration and purification of sialic acid before the actual detection step. By using magnetic particles with boronic acid groups to selectively bind and concentrate sialic acid from biological fluids in advance, the method prepares a sufficiently concentrated sample for subsequent detection, making early cancer detection feasible
2Measurement precision
If biomarker-specific detection method is used for each cancer species, then specific cancer detection is accurate, but comprehensive cancer testing across multiple species is not achievable
Solution Approach 1:
The invention uses sialic acid as a universal biomarker that is commonly overexpressed across multiple cancer species rather than requiring cancer-specific biomarkers. The magnetic particle complex with boronic acid can bind sialic acid from any cancer source, enabling a single platform to detect multiple cancer types simultaneously, thus achieving both accuracy and versatility
Solution Approach 2:
The invention introduces sialic acid as an intermediary molecule that mediates between diverse cancer cells and the detection system. Instead of requiring direct interaction between detection reagents and various cancer-specific biomarkers, the system uses sialic acid (which is universally present on cancer cell surfaces) as a common intermediary that can be captured by boronic acid-functionalized magnetic particles, enabling comprehensive cancer screening
3Reliability
If boronic acid with low binding force (aminophenylboronic acid) is used for sialic acid detection, then selectivity is achieved, but binding strength is insufficient for effective concentration
Solution Approach 1:
The invention creates a composite material by combining magnetic particles with boronic acid functional groups through a linker molecule. This composite structure integrates the selectivity of boronic acid for sialic acid with the concentration capability of magnetic particles, and the composite design optimizes the binding interaction strength while maintaining selectivity
Solution Approach 2:
The invention changes the parameters of the boronic acid compound by selecting specific types (such as 5-BPA with high binding constants exceeding 1,000 M^-1) and optimizing the molecular structure through linkers. This parameter optimization enhances the binding force between the boronic acid group and sialic acid while preserving the selective recognition capability, enabling effective concentration of sialic acid
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 allows for the effective collection and concentration of sialic acid, enabling comprehensive cancer testing that is not species-specific, improving the detection of early cancers and enhancing patient prognosis.
Implementation Method 1
boronic acid that selectively binds to the sialic acid has been reported
Implementation Method 2
A complex comprising a boronic acid group with a binding constant of 500 M^-1 or more and a magnetic particle, chemically bonded through a linker
Implementation Method 3
a recovering step of separating and recovering the complex after the bonding step from the liquid sample with a magnet
Implementation Method 4
a bonding step of bonding sialic acid to the complex of any one of the above-mentioned items <1> to <8> by adjusting a pH of a liquid sample, which contains the complex and a biological fluid containing the sialic acid, to less than 6
Data Source
Figure 1~2
Figure 3~5
Figure 6(a)~7
AI summary
Provided are a complex, which can collect and concentrate sialic acid, and a method of collecting the sialic acid. A complex (1) of the present invention is represented by the following formula (1): Ba-L-Mp (1) where, in the formula (1), Ba represents a boronic acid group having a binding constant Ka with sialic acid of 500 M-1 or more, Mp represents a magnetic particle having ferromagnetism, and L represents a linker for bonding the boronic acid group and the magnetic particle. The complex represented by the formula (1) shows a state in which the boronic acid group and the magnetic particle are chemically bonded through the linker.