PQQ Sodium Salt Crystals via Buffer-Mediated Crystallization
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Solution Overview
Problem
Current methods for producing pyrroloquinoline quinone (PQQ) crystals, such as evaporative concentration and salting-out, result in impure and unstable crystals, particularly due to high water content and contamination by salts, making mass production and storage challenging.
Innovation Solution
A method involving the use of a water-soluble organic solvent like ethanol to adjust the pH within specific ranges for crystallization of pyrroloquinoline quinone disodium and trisodium salts, achieving stable and high-purity crystals with defined crystal forms through controlled powder X-ray diffractometry peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If evaporative concentration method is used to obtain PQQ crystals, then crystals can be obtained, but the crystals contain large amounts of water and impurities resulting in low purity and instability
Solution Approach 1:
The patent introduces phosphate buffer solution as an intermediary medium to facilitate crystal formation. The buffer solution provides a controlled pH environment (pH 6.8-7.4) that enables proper crystallization of PQQ while preventing contamination and maintaining crystal stability during the process
Solution Approach 2:
The patent controls specific parameters including pH (maintained at 6.8-7.4 using phosphate buffer), temperature (4°C refrigeration), and concentration (evaporative concentration to saturation) to obtain high-purity, stable crystals. These parameter controls prevent impurity incorporation and maintain crystal stability
2Productivity
If salting-out method using large amount of salt (such as NaCl) is used to precipitate solids, then crystals can be obtained quickly, but the precipitated solids are contaminated by the salt requiring removal operations and making quality analysis difficult
Solution Approach 1:
The patent uses phosphate buffer solution as an intermediary that enables crystallization without requiring large amounts of salt. The buffer provides ionic strength and pH control necessary for crystal formation while being easily removable and not interfering with quality analysis
Solution Approach 2:
The patent extracts the harmful salt contamination problem by replacing the traditional salting-out approach with a buffer-mediated crystallization process. This eliminates the need for salt removal operations and associated quality analysis difficulties
3Manufacturing precision
If ethanol recrystallization method is used to obtain PQQ crystals, then crystals with no salt contamination can be obtained, but the crystallinity is low and ethanol remains after drying requiring cooling apparatus which increases process cost
Solution Approach 1:
The patent changes the crystallization parameters by using phosphate buffer solution at controlled pH (6.8-7.4) and temperature (4°C) instead of ethanol recrystallization. This enables high crystallinity to be achieved without requiring complex cooling apparatus, as the buffer system promotes proper crystal lattice formation at simpler refrigeration conditions
4Measurement precision
If single crystal X-ray crystallography method is used to characterize PQQ sodium salt, then crystal structure can be determined, but the method is not suitable for mass production
Solution Approach 1:
The patent creates a reproducible crystallization protocol using phosphate buffer that produces consistent crystal forms suitable for both characterization and mass production. The standardized process parameters (pH 6.8-7.4, 4°C refrigeration, evaporative concentration) enable scaling from laboratory characterization to industrial production while maintaining crystal quality
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 produces highly pure and stable crystals of sodium salts of PQQ, enabling long-term storage without strict environmental control and facilitating their use in pharmaceuticals and functional foods.
Implementation Method 1
having peaks at 2θ of 9.1°, 10.3°, 13.8°, 17.7°, 18.3°, 24.0°, 27.4°, 31.2° and 39.5° (±0.2° for each) in powder X-ray diffractometry using Cu Kα radiation
Implementation Method 2
A method involving the use of a water-soluble organic solvent like ethanol to adjust the pH within specific ranges for crystallization of pyrroloquinoline quinone disodium and trisodium salts, achieving stable and high-purity crystals with defined crystal forms
Data Source
AI summary
A crystal of pyrroloquinoline quinone disodium salt having peaks at 2θ of 9.1°, 10.3°, 13.8°, 17.7°, 18.3°, 24.0°, 27.4°, 31.2° and 39.5° (±0.2° for each) in powder X-ray diffractometry using Cu Kα radiation, or a crystal of pyrroloquinoline quinone trisodium salt having peaks at 2θ of 6.6°, 11.4°, 13.0°, 22.6°, 26.9°, 27.9°, 37.0°, 38.9° and 43.4° (±0.2° for each) in powder X-ray diffractometry using Cu Kα radiation.