Polysaccharide Derivative Separating Agent for Optical Isomers
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Solution Overview
Problem
Current separating agents for optical isomers, such as phenylcarbamate derivatives of amylose, have limitations in their optical resolving power, as indicated by an average introduction ratio of substituents per monosaccharide unit being less than or equal to 3, which restricts their enantioselective recognition ability and separation efficiency in chromatographic fractionation methods.
Innovation Solution
A polysaccharide derivative is developed by replacing hydrogen atoms on cellulose or amylose with specific atomic groups represented by Formulae (1) and (2), where the sum of the average introduction ratios of R1 and R2 exceeds 3.0, enhancing the enantioselective recognition ability and allowing for higher separation factors in optical isomer separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the average introduction ratio of substituents in polysaccharide derivative is increased to improve enantioselective recognition ability, then the separation factor and optical resolving power are improved, but the complexity of derivative synthesis and structural control becomes more difficult
Solution Approach 1:
The patent applies parameter changes by systematically varying the average introduction ratio of substituents (R1 and R2) on polysaccharide derivatives from conventional values (≤3) to higher values (>3, specifically 3.05-5.0). This parameter modification directly improves the enantioselective recognition ability and separation factor while the patent provides methods to control the synthesis complexity through regulated substitution conditions
Solution Approach 2:
The patent creates composite material structures by introducing multiple types of substituents (R1 and R2 groups) onto the polysaccharide backbone. These composite polysaccharide derivatives combine the chiral recognition capability of the polysaccharide framework with the enhanced selectivity provided by the substituted aromatic or aliphatic groups, achieving superior optical resolution
2Reliability
If the average introduction ratio of substituents is increased beyond 3.0, then the enantioselective recognition ability is enhanced, but the manufacturing difficulty and process control become more challenging
Solution Approach 1:
The patent modifies the substitution degree parameter from conventional limits (≤3) to enhanced values (>3.0), which improves reliability of enantioselective recognition. The patent addresses manufacturing difficulty by establishing controlled synthesis conditions and providing methods to achieve consistent high-introduction ratios
Solution Approach 2:
The patent applies excessive action by intentionally introducing more substituents than the conventional maximum of 3 per monosaccharide unit. This excessive substitution (achieving 3.05-5.0 average introduction ratios) provides enhanced optical resolving power, and the patent manages the resulting manufacturing challenges through optimized synthesis protocols
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 polysaccharide derivative with a higher average introduction ratio of substituents provides improved enantioselective recognition and separation efficiency, demonstrated by higher separation factors in high-performance liquid chromatography, effectively addressing the limitations of existing agents.
Implementation Method 1
Fractionation methods based on high-performance liquid chromatography using separating agents for optical isomers are known to be techniques that respond to this problem
Implementation Method 2
an enantioselective recognition ability for a broad range of compounds is known to be exercised in particular by separating agents in which a carbamate or ester derivative of a cellulose or amylose is supported on a silica gel
Data Source
Figure 1
AI summary
The present invention provides a separating agent for optical isomers that contains a cellulose derivative or amylose derivative that has an excellent enantioselective recognition ability. The present invention comprises a separating agent for optical isomers that uses a polysaccharide derivative provided by replacing all or a portion of the hydrogen atoms on the hydroxyl groups present in a polysaccharide with two specific atomic groups that act on optical isomers targeted for separation in an optical resolution, wherein the sum of the average introduction ratios of specific terminal substituents in these atomic groups is greater than 3.0 per monosaccharide unit.