PQQ Quantitative Analysis Using Glycine Derivatization
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Solution Overview
Problem
Current methods for quantitative analysis of pyrroloquinoline quinone (PQQ) in functional foods are inadequate due to interference from coexisting components, requiring expensive and hazardous derivatization reagents, and are not suitable for analyzing PQQ in the mg range, which is common in capsules and tablets.
Innovation Solution
Converting PQQ into a more stable derivative, imidazopyrroloquinoline, using glycine, followed by an organic solvent extraction and oxidation step to remove lipid-soluble contaminants, and employing a standard addition method for accurate quantification, allowing for safe, convenient, and interference-resistant analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional HPLC analysis is used for PQQ quantification, then the analysis is relatively simple, but it is susceptible to interference from coexisting food components and quantitative performance deteriorates
Solution Approach 1:
The patent applies preliminary derivatization action by reacting PQQ with glycine before HPLC analysis to form a stable derivative. This preliminary chemical modification protects PQQ from interference by food components during analysis, resolving the contradiction between simple operation and accurate measurement.
2Reliability
If derivatization is performed using conventional reagents (esterification, acylation, or silylation), then PQQ can be stabilized for analysis, but the reagents are expensive and require safety precautions
Solution Approach 1:
The patent replaces expensive and hazardous derivatization reagents with glycine, which is inexpensive, safe, and readily available. This substitution maintains the reliability of PQQ stabilization while eliminating safety concerns and costs associated with conventional reagents.
3Measurement precision
If gas chromatography/mass spectrometry or liquid chromatography/tandem mass spectrometry is used, then trace analysis sensitivity is improved, but the pretreatment becomes complicated and working efficiency decreases
Solution Approach 1:
The patent extracts only the essential function of derivatization (stabilizing PQQ) while eliminating the complex pretreatment steps required by GC/MS and LC/MS methods. By using glycine derivatization followed by simple HPLC analysis, the method removes unnecessary complexity while maintaining adequate sensitivity for mg-range analysis.
4Measurement precision
If conventional derivatization methods are used, then PQQ can be analyzed, but special internal standard substances (mainly 13C) are required making the method not general
Solution Approach 1:
The patent makes the method self-sufficient by using glycine as both the derivatizing agent and a readily available standard substance. This eliminates the need for special 13C-labeled internal standards, allowing the method to be universally applied to any PQQ-containing product without requiring specialized reagents.
5Quantity of substance
If absorbance analysis after diamine derivatization is used, then analysis on the order of mg is enabled, but the method assumes no other substances with specific absorbance exist in the sample
Solution Approach 1:
The patent uses HPLC chromatography as an intermediary separation step between derivatization and detection. This intermediary process separates the PQQ-glycine derivative from other coexisting substances in the sample, enabling accurate quantification at mg levels without the interference assumptions required by direct absorbance analysis.
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 method enables rapid and accurate quantitative analysis of PQQ in functional foods containing complex components, improving quantitative performance and reducing interference from coexisting substances, thus enhancing the analysis of PQQ in various products, including health foods and medicines.
Implementation Method 1
a sample preparation step of preparing a measurement sample by mixing a measurement object containing pyrroloquinoline quinone with glycine so that the pyrroloquinoline quinone or the salt thereof reacts with the glycine to produce imidazopyrroloquinoline
Implementation Method 2
an organic solvent extraction and oxidation step to remove lipid-soluble contaminants
Implementation Method 3
an organic solvent extraction and oxidation step to remove lipid-soluble contaminants
Implementation Method 4
a quantitative analysis step of determining quantitatively the amount of the pyrroloquinoline quinone or the salt thereof contained in the measurement object, based on a chromatogram of the imidazopyrroloquinoline or the salt thereof contained in the measurement sample obtained by chromatography
Data Source
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AI summary
An analysis method having: a sample preparation step of preparing a measurement sample by mixing a measurement object containing pyrroloquinoline quinone or a salt thereof with glycine so that the pyrroloquinoline quinone or the salt thereof reacts with the glycine to produce imidazopyrroloquinoline or a salt thereof; and a quantitative analysis step of determining quantitatively the amount of the pyrroloquinoline quinone and the salt thereof contained in the measurement object, based on a chromatogram of the imidazopyrroloquinoline or the salt thereof contained in the measurement sample obtained by chromatography.