Hydrogen Peroxide Sensitive Metal Nanoparticles for Photothermal Therapy
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Solution Overview
Problem
Current metal nanoparticles used in photothermal therapy face challenges such as toxicity from non-naturally occurring surface ligands and limited selectivity in targeting cancer cells, due to the lack of control over surface structure and electron charge.
Innovation Solution
Development of hydrogen peroxide sensitive metal nanoparticles with biocompatible metals like gold, platinum, or silver, coated with hydrogen peroxide reactive ions like iodide, which form agglomerates in the presence of hydrogen peroxide, increasing light absorbance in the visible and infrared range, allowing for localized heat generation only in regions with high hydrogen peroxide levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface ligands are used to control surface structure and electron charge of metal nanoparticles, then photothermal therapy effectiveness is improved, but toxicity increases due to non-naturally occurring ligands
Solution Approach 1:
The patent changes the chemical composition parameter of surface ligands from synthetic molecules to naturally occurring ions (iodide, chloride, bromide). This substitution maintains the ability to control surface electron charge and structure while eliminating toxicity associated with non-natural ligands, directly resolving the contradiction between therapeutic effectiveness and safety
Solution Approach 2:
The patent employs simple, naturally occurring halide ions as surface ligands instead of complex synthetic molecules. These simple ions can be easily exchanged and replaced, allowing for controlled surface modification without introducing persistent toxic substances, thus reducing overall system toxicity while maintaining functional effectiveness
2Power
If metal nanoparticles are used for photothermal therapy, then heat generation capability is improved, but selectivity in targeting cancer cells is limited
Solution Approach 1:
The patent performs preliminary action by pre-functionalizing metal nanoparticles with hydrogen peroxide-reactive halide ions before administration. These ions are specifically designed to react with hydrogen peroxide that is naturally present at higher concentrations in cancer cells, enabling the nanoparticles to automatically activate and generate heat only in the target tissue, thus achieving selective cancer cell targeting while maintaining high heat generation capability
Solution Approach 2:
The patent introduces hydrogen peroxide as an intermediary substance that mediates between the metal nanoparticles and cancer cells. The halide ions on the nanoparticle surface act as sensors for hydrogen peroxide, and upon reaction, trigger heat generation. This intermediary mechanism enables selective activation in cancer cells (which have higher hydrogen peroxide levels) while sparing normal cells, thereby improving selectivity without compromising heat generation power
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
Enhances photothermal therapy by increasing heat emission efficiency and minimizing side effects on normal tissues, using naturally occurring ions to reduce toxicity and control heat generation, effectively targeting cancer cells while sparing normal cells.
Implementation Method 1
a hydrogen peroxide reactive ion that is bonded to a surface of the metal nanoparticle and may be oxidized by hydrogen peroxide
Implementation Method 2
The agglomerates of the metal nanoparticles may have a light absorbance which is higher than the light absorbance of the metal nanoparticles prior to the forming of the agglomerate in both the visible light wavelength band of not less than about 600 nm and the infrared wavelength band
Implementation Method 3
Photothermal therapy is a therapeutic method in which light energy is converted into heat energy that attacks the cells that are to be treated
Implementation Method 4
The light condensed on the surface of gold nanoparticles may be emitted via various routes, including the heat-accompanied processes of electron-lattice vibration and electron-electron scattering
Implementation Method 5
The light condensed on the surface of gold nanoparticles may be emitted via various routes, including the heat-accompanied processes of electron-lattice vibration and electron-electron scattering
Implementation Method 6
surface plasmon resonance characteristics appear as a result of the behavior of free electrons, giving unique optical characteristics to metal nanoparticles. Surface plasmon is a phenomenon in which electrons in a metal oscillate as a group when light is incident between the surfaces of conducive metal nanoparticles and dielectric materials
Data Source
AI summary
Provided is a hydrogen peroxide sensitive metal nanoparticle including: a metal nanoparticle including a biocompatible metal and a hydrogen peroxide reactive ion which is bonded to a surface of the metal nanoparticle and is oxidized by hydrogen peroxide.