Tunable Plasmonic Nanoparticles for Selective Photothermal Therapy
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Solution Overview
Problem
Current methods for detecting and treating cancer, such as photodynamic therapy and photothermal therapy, face challenges including the nonspecificity of heating, risk of severe burns, and limited light penetration in deep tissues, while noble metal nanoparticles struggle to position plasmon resonance at technologically important wavelengths like near infrared.
Innovation Solution
Development of noble metal nanoparticles, specifically gold and silver nanoparticles, with tunable surface plasmon resonance in the visible and near-infrared range, conjugated with binding moieties for molecular imaging and therapy, allowing for selective targeting and treatment of cancer cells using light scattering and absorption techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photothermal therapy uses high power laser light to heat tumor cells, then cancer cells are destroyed through thermal necrosis, but healthy cells are also damaged due to nonspecific heating
Solution Approach 1:
The patent applies local quality by functionalizing specific cells with nanoparticles containing photothermal agents, so that only targeted cells (e.g., cancer cells) possess the photothermal conversion capability. This creates a spatially heterogeneous distribution of photothermal properties, enabling selective heating of only those cells that have internalized the nanoparticles, thereby destroying cancer cells while sparing healthy surrounding tissue.
Solution Approach 2:
The patent introduces nanoparticles containing photothermal agents as an intermediary substance that mediates between the external laser irradiation and the target cells. These nanoparticles act as localized photothermal converters that absorb light energy and convert it to heat precisely where they are internalized by cancer cells, providing a bridging mechanism that enables selective thermal destruction without directly exposing all tissue to high-power laser light.
2Use of energy by moving object
If solid gold nanoparticles are used for photothermal therapy, then they provide strong absorption, but their plasmon resonance cannot be shifted to near infrared wavelengths needed for deep tissue penetration
Solution Approach 1:
The patent applies parameter changes by systematically varying multiple nanoparticle parameters including core material composition, shell thickness, overall size, and shape to tune the plasmon resonance wavelength. By adjusting these physical and chemical parameters, the patent achieves continuous tuning of the absorption spectrum from visible to near-infrared regions, enabling optimization for deep tissue penetration while maintaining strong absorption efficiency.
Solution Approach 2:
The patent employs composite material structures such as core-shell nanoparticles where a metallic core is surrounded by a dielectric or semiconductor shell. This composite architecture enables independent optimization of the core for strong plasmonic absorption and the shell for wavelength tuning and biocompatibility, achieving both high absorption efficiency and tunable near-infrared resonance simultaneously.
3Measurement precision
If quantum dots are used for cellular imaging, then they provide size-dependent fluorescence properties for detection, but they exhibit human toxicity and cytotoxicity that prevents in vivo application
Solution Approach 1:
The patent replaces persistent, toxic semiconductor quantum dots with biocompatible alternative materials such as carbon-based nanoparticles, silica shells, or polymer-coated structures that are either inherently non-toxic or can be safely cleared from the body. These alternative materials maintain the necessary optical properties for detection while eliminating long-term toxicological concerns, effectively substituting a 'disposable' imaging agent that does not accumulate toxically.
Solution Approach 2:
The patent uses composite material designs where a toxic or unstable core material is encapsulated within a biocompatible shell or coating layer. This composite structure isolates the toxic components from biological systems while preserving the optical functionality of the core, thereby achieving both detection capability and biocompatibility simultaneously.
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
These nanoparticles enable precise differentiation of cancer cells from normal cells and efficient photothermal treatment with reduced light intensity, minimizing damage to healthy tissues and improving treatment efficacy.
Implementation Method 1
noble metal plasmonic nanoparticles (those that have characteristic strong surface plasmon resonance absorption and scattering shape tunable spectra)
Implementation Method 2
Photothermal therapy uses heat instead of chemicals to treat cancer and other diseases
Data Source
AI summary
Noble metal nanoparticles and methods of their use are provided. Certain aspects provided solid noble metal nanoparticles tuned to the near infrared. The disclosed nanoparticles can be used in molecular imaging, diagnosis, and treatment. Methods for imaging cells are also provided.