Glycan Sample Preparation for Rapid Sialic Acid Linkage Analysis
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Solution Overview
Problem
Current methods for analyzing sialic acid linkage types in glycans through mass spectrometry are hindered by the negative charge of sialic acid, which suppresses ionization and causes instability, leading to decomposition and complex, time-consuming procedures.
Innovation Solution
A method involving lactonization and amidation reactions using specific amines and dehydration condensation agents, with aminolysis in the amidation step to stabilize lactones quickly, eliminating the need for dehydration condensation agents and reducing reaction time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chemical derivatization methods are used to modify sialic acid linkage types, then type-by-type analysis becomes possible, but the procedure becomes complex and time-consuming
Solution Approach 1:
The patent combines lactonization and amidation reactions into a single sequential process where the lactone formed from α2,3-sialic acid is immediately amidated in the same reaction mixture, eliminating the need for separate hydrolysis and derivatization steps. This merging of steps simplifies the overall procedure while maintaining linkage type differentiation capability.
Solution Approach 2:
The patent performs lactonization as a preliminary action that stabilizes the sialic acid structure before the main amidation analysis step. By forming the lactone ring first, the method prepares the molecule for subsequent rapid amidation, preventing decomposition during the analysis process and enabling faster overall procedure.
2Reliability
If lactone stabilization through derivatization is performed, then decomposition is prevented, but reaction time increases to 2 hours
Solution Approach 1:
The patent maintains continuous useful action by immediately performing amidation on the freshly formed lactone without isolating or storing it. The lactone is converted to the stable amide derivative in the same reaction sequence, eliminating idle time where decomposition could occur and reducing total reaction time from 2 hours to a much shorter duration.
Solution Approach 2:
The patent skips the intermediate isolation and storage steps that would allow lactone decomposition. By rushing through the reaction sequence with immediate amidation of the lactone in situ, the method prevents the harmful decomposition process while maintaining rapid reaction times.
3Manufacturing precision
If multiple reaction steps are used for lactone hydrolysis and amidation, then complete conversion is achieved, but process complexity increases
Solution Approach 1:
The patent merges the hydrolysis and amidation steps into a single operational sequence where both reactions occur in the same reaction vessel without intermediate handling. The lactone is hydrolyzed and the resulting carboxylic acid is immediately amidated in situ, achieving complete conversion while simplifying the operational procedure to a single mixed step.
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 quicker stabilization and analysis of sialic acid linkage types, preventing decomposition and simplifying the process, thereby enhancing the efficiency and accuracy of sialic acid analysis in glycans.
Implementation Method 1
performing an amidation reaction in which the lactones of the lactonized sialic acids are amidated by aminolysis through addition of an amidation reaction solution to the sample
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
A method for preparing a sample comprising a glycan includes: performing a lactonization reaction in which at least a part of sialic acids included in the glycan is lactonized; and performing an amidation reaction in which lactones of lactonized sialic acids are amidated through addition of an amidation reaction solution to the sample, the amidation reaction solution comprising at least one selected from the group consisting of ammonia, an amine, and a salt thereof that is reacted with the lactonized sialic acids.