Spin-Labeled Ice Binding Compounds for DNP Signal Enhancement
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Solution Overview
Problem
The low sensitivity of Nuclear Magnetic Resonance (NMR) techniques for high-throughput applications due to the low equilibrium polarization of nuclear spins, which is limited by the strength of the external magnetic field and sample temperature, and the need for a solvent that mimics biological environments in Dynamic Nuclear Polarization (DNP) processes.
Innovation Solution
The use of electron spin-labeled ice binding compounds (IBCs), including ice binding proteins (IBPs) and antifreeze proteins (AFPs), to homogeneously distribute paramagnetic centers in frozen water solutions for DNP, allowing for effective polarization of nuclear spins without the limitations of traditional water-glycerol solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the strength of the external magnetic field is increased to increase nuclear spin polarization, then NMR sensitivity is improved, but the cost and technological feasibility deteriorate
Solution Approach 1:
The patent introduces paramagnetic centers (such as nitroxide radicals or metal ions) as intermediary substances to mediate the polarization transfer from electrons to nuclear spins. These paramagnetic centers act as a bridge, enabling nuclear spin polarization enhancement without requiring extremely high external magnetic fields, thus resolving the contradiction between NMR sensitivity and device complexity.
Solution Approach 2:
The patent changes the physical parameters of the system by introducing paramagnetic substances with unpaired electrons. By utilizing the high magnetic moment of electrons compared to nuclei, the system achieves enhanced nuclear spin polarization through dynamic nuclear polarization (DNP) effects, allowing sensitivity improvement without proportionally increasing magnetic field strength.
2Measurement precision
If the sample temperature is decreased to increase nuclear spin polarization, then NMR sensitivity is improved, but the complexity of temperature control and sample preservation deteriorates
Solution Approach 1:
The patent uses paramagnetic centers as intermediaries that facilitate polarization transfer at relatively higher temperatures compared to traditional low-temperature NMR methods. The paramagnetic substances enable efficient DNP effects without requiring extreme cryogenic conditions, thereby reducing temperature control complexity while maintaining sensitivity improvements.
3Stability of the object's composition
If traditional water-glycerol solvent is used for DNP, then homogeneous distribution of paramagnetic centers is achieved, but the biological environment is altered
Solution Approach 1:
The patent employs composite solvent systems that combine water with cryoprotectants or uses water-miscible organic solvents to achieve both homogeneous distribution of paramagnetic centers and preservation of biological environment. This composite approach allows the solution to maintain structural integrity and homogeneity while remaining compatible with biological samples.
Solution Approach 2:
The patent modifies the chemical composition parameters of the solvent system to optimize both homogeneity and biological compatibility. By adjusting solvent ratios, pH, and adding specific additives, the system achieves homogeneous paramagnetic center distribution without requiring non-biological solvents like pure glycerol, thus maintaining adaptability to biological environments.
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 enhances NMR signal sensitivity, enables broader applications in biomolecular studies, and maintains the natural environment of biological samples, while preserving the cryo-protected structures and orientations of spin-labeling groups, facilitating enhanced DNP mechanisms like the Overhauser, Solid, Cross, and Thermal Mixing effects.
Implementation Method 1
electron spin-labeled ice binding compounds (IBCs), including ice binding proteins (IBPs) and antifreeze proteins (AFPs), to homogeneously distribute paramagnetic centers in frozen water solutions for DNP
Implementation Method 2
dynamic nuclear polarization (DNP), and for further performing Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging (MM) using the compounds so produced
Implementation Method 3
facilitating enhanced DNP mechanisms like the Overhauser, Solid, Cross, and Thermal Mixing effects
Implementation Method 4
facilitating enhanced DNP mechanisms like the Overhauser, Solid, Cross, and Thermal Mixing effects
Implementation Method 5
facilitating enhanced DNP mechanisms like the Overhauser, Solid, Cross, and Thermal Mixing effects
Implementation Method 6
facilitating enhanced DNP mechanisms like the Overhauser, Solid, Cross, and Thermal Mixing effects
Implementation Method 7
preserving the cryo-protected structures and orientations of spin-labeling groups
Data Source
AI summary
Spin-labeled ice binding compounds (IBCs) including ice binding proteins (IBPs) or antifreeze proteins (AFPs) and their analogs may carry paramagnetic centers for dynamic nuclear polarization (DNP), for enhancing nuclear magnetic resonance (NMR) signal intensities. Use of spin-labeled IBCs to perform DNP exploits the IBCs' ability to homogeneously distribute the paramagnetic centers in frozen water solution at low temperature, leading to high DNP efficiency. Other advantages of using spin-labeled IBCs include cryo-protecting biological samples; cryo-preserving relative positions and orientations of the spin labeling groups; selecting positions and orientations of spin labeling groups with freedom and without technical barriers to making multiple spin labels in an IBC; and enabling use of a solvent that is primarily water for DNP at low temperatures in view of the potentially high water solubilities of spin-labeled IBCs.