Plant Polysaccharide Glycosidic Bond Detection by Methylation LC-MS
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for analyzing glycosidic bonds in plant polysaccharides, particularly those involving LC-MS, are limited in their ability to provide comprehensive glycosidic bond information, especially for acidic sugars, and are time-consuming and cumbersome.
Innovation Solution
A method combining rapid methylation of plant polysaccharides with PMP derivatization followed by LC-MS analysis in MRM mode, which includes steps like methylation, derivatization, and mass spectrometry to detect glycosidic bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If methylation derivatization combined with GC-MS is used for analyzing glycosidic bonds, then the analysis can be performed, but the process is time-consuming and operationally cumbersome
Solution Approach 1:
The patent replaces the GC-MS detection system with an LC-MS detection system. This substitution changes the fundamental detection mechanism, allowing for direct analysis of methylated polysaccharides without requiring complex derivatization steps, thereby significantly reducing analysis time while maintaining detection capability
Solution Approach 2:
The patent performs methylation derivatization as a preliminary step before LC-MS analysis. By pre-modifying the polysaccharides with methyl groups, the method enables direct injection and analysis without time-consuming operational steps during the actual detection process
2Loss of information
If conventional methylation analysis methods are used, then glycosidic bond information can be obtained, but fine structure information is lost
Solution Approach 1:
The patent changes the detection parameters and conditions by using LC-MS with specific mass-to-charge ratio monitoring. This allows for the detection of molecular ion peaks that preserve fine structure information, enabling accurate characterization of glycosidic bond configurations without losing structural details
3Productivity
If LC-MS with methylation is used for rapid analysis, then efficiency is improved, but glycosidic bond information of acidic sugars cannot be obtained
Solution Approach 1:
The patent enhances the universality of the LC-MS method by optimizing the detection parameters to simultaneously detect both neutral and acidic sugars. The method can identify glycosidic bonds of acidic sugars through specific mass spectral characteristics, making it a multi-functional tool that handles diverse polysaccharide compositions without sacrificing efficiency
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 enables the analysis of over 90 glycosidic residues, covering all glycosidic bond types, including acidic sugars, with faster and more reliable results.
Implementation Method 1
performing rapid methylation of the plant polysaccharides in a micro-volume
Implementation Method 2
derivatizing glycosidic residues of the methylated plant polysaccharides with PMP reagent
Implementation Method 3
performing mass spectrometry analysis by LC-MS in MRM mode
Implementation Method 4
adding 100 μL of 2 M trifluoroacetic acid to a product resulted from step (4), hydrolyzing at 100° C. for 8 hours
Data Source
AI summary
The present invention relates to a method for detecting glycosidic bonds of plant polysaccharides. The method includes taking 100 μL of NaOH-DMSO suspension (1 mg/mL) of plant polysaccharides containing 20 or more kinds of substances such as galactan, araban, polygalacturonic acid, rhamnogalacturonan-I, rhamnogalacturonan-II, xyluronic acid, arabogalacturonic acid I and arabogalacturonic acid II, shaking at room temperature for 30 minutes, adding 40 μL of iodomethane and shaking for 1 hour. Such process is repeated three times to obtain methylated plant polysaccharides. The method further includes using an automatic detection equipment for methylation combined with PMP derivatization to analyze glycosidic bonds in polysaccharides. Not only the glycosidic bond information of neutral sugars can be analyzed in the subsequent LC-MS mass spectrometry analysis, but also the glycosidic bond information of acidic sugars can be resulted, and the analysis results are faster, more detailed and more reliable.