Solvent NMR Relaxation for Noninvasive Nanoparticle Clustering Detection
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Solution Overview
Problem
Current analytical techniques for nanoparticle characterization are invasive, complex, and unreliable, failing to detect subtle differences in nanoparticle clustering and physicochemical properties, which can impact the quality and safety of nanoparticle-based products, especially pharmaceuticals, and pose challenges in regulatory approval of generic versions.
Innovation Solution
The method utilizes the transverse relaxation rate of solvent NMR signals, specifically R2, to nondestructively assess nanoparticle clustering and physicochemical differences, allowing for fast and reliable quality control without opening the product container, using benchtop NMR instruments and commercially available computer-controlled autosamplers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radiation scattering techniques (DLS, SAXS, SANS) are used for nanoparticle characterization, then nanoparticle size and clustering can be detected, but the product becomes unusable and inspection results are unreliable due to intrusiveness
Solution Approach 1:
The patent replaces intrusive mechanical/physical analysis methods (radiation scattering, electron microscopy) with non-intrusive nuclear magnetic resonance (NMR) spectroscopy. NMR detects nanoparticle clustering through solvent relaxation rate changes without contacting or damaging the product, thereby maintaining both measurement precision and product usability.
Solution Approach 2:
The patent uses the solvent (e.g., water) as an intermediary to indirectly detect nanoparticle properties. Instead of directly measuring nanoparticles with intrusive techniques, the method measures how nanoparticles affect solvent molecular motion and NMR relaxation rates, enabling non-intrusive detection of clustering while preserving product integrity.
2Measurement precision
If imaging techniques (SEM, fluorescence mapping) are used for nanoparticle characterization, then detailed size and morphology data can be obtained, but the inspection process becomes complex and expensive requiring specialized instruments and software
Solution Approach 1:
The patent replaces complex imaging systems (SEM requiring vacuum chambers, electron beams, and sophisticated image analysis software) with NMR spectroscopy, which uses magnetic fields and radiofrequency pulses. This substitution maintains the ability to detect nanoparticle properties while dramatically reducing instrument and operational complexity.
Solution Approach 2:
The patent extracts only the essential information needed for quality control (clustering extent via relaxation rates) from the complex data sets produced by imaging techniques. By focusing on solvent relaxation parameters rather than full image analysis, the method achieves necessary measurement precision with simpler equipment and procedures.
3Measurement precision
If sample preparation procedures (drying, freezing, labeling) are performed for nanoparticle analysis, then analytical data can be obtained, but the product is significantly perturbed making inspection results unreliable
Solution Approach 1:
The patent performs the measurement action before any sample preparation that could alter the product. By conducting NMR spectroscopy on the product in its native sealed state, the method obtains reliable clustering data without perturbation, eliminating the need for drying, freezing, or labeling procedures that would compromise product integrity.
Solution Approach 2:
The patent replaces physical sample preparation procedures (mechanical drying, cryogenic freezing, chemical labeling) with a non-contact NMR measurement process. This substitution allows obtaining analytical data while maintaining the product in its original state, ensuring inspection results accurately reflect the actual product conditions.
4Measurement precision
If conventional analytical techniques are used for nanoparticle product inspection, then clustering detection is possible, but the process requires opening sealed products and transferring contents which is time-consuming and risks contamination
Solution Approach 1:
The patent uses the solvent NMR signal as an intermediary to detect nanoparticle clustering through the container wall without opening the product. This approach maintains measurement precision by detecting relaxation rate changes while dramatically improving productivity by eliminating sample transfer steps and contamination risks.
Solution Approach 2:
The patent makes the NMR instrument capable of analyzing products in their original sealed containers, adding a universal quality control function that works for various nanoparticle formulations without requiring sample preparation. This multi-functional capability speeds up inspection by allowing direct analysis of multiple products in sequence.
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 noninvasive, rapid, and cost-effective detection of acceptable clustering levels and physicochemical differences, ensuring product quality and safety, and facilitating regulatory compliance by providing a reliable method for distinguishing between innovator and generic nanoparticle products.
Implementation Method 1
solvent nuclear magnetic resonance (NMR)
Implementation Method 2
the transverse relaxation rate of solvent molecules, R2, as an indicator of the extent of clustering
Data Source
AI summary
The present invention generally relates to a method of using the transverse relaxation rates (R2) of solvent NMR signal to noninvasively assess particle-containing products formulated as suspension or emulsion in solvent(s). Anomaly in released products and differences between innovator and follow-on products can be distinguished by this technology nondestructively without the vial or container being opened or protective seal compromised (i.e., broken).