Near-Infrared Dye Composite Particles for Photothermal Stability
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Solution Overview
Problem
Existing near-infrared-absorbing dyes, such as indocyanine green, suffer from low photostability, nonspecific aggregation, and chemical degradation, limiting their effectiveness in photothermal therapy and imaging due to poor colloidal stability and rapid removal by serum proteins.
Innovation Solution
The development of near-infrared-absorbing composite particles formed by precipitating an ionizable dye with a metal cation to create a water-insoluble salt, which is then encapsulated in a polymeric surfactant particle, enhancing colloidal stability and photothermal efficiency while preventing aggregation and degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrophilic cyanine dyes containing sulfonate groups (e.g., indocyanine green) are used for near-infrared photothermal therapy, then the therapy can be performed with FDA-approved materials, but the dyes suffer from low photostability, low photon yield, low sensitivity, nonspecific aggregation, and rapid removal through kidneys
Solution Approach 1:
The patent combines near-infrared-absorbing dyes with polymeric surfactants to form composite particles. The polymeric surfactant shell provides structural stability and prevents aggregation, while the dye core maintains photothermal activity. This composite structure resolves the contradiction by providing both photostability (from the stable polymer matrix) and sustained photon yield (from protected dye molecules that don't aggregate or degrade).
Solution Approach 2:
The polymeric surfactant forms a protective shell around the dye molecules. This shell prevents nonspecific aggregation of dye molecules while allowing them to maintain their photonic properties. The flexible polymer matrix protects the embedded dye from environmental degradation factors (solvents, temperature changes, light exposure) while maintaining the necessary optical properties for photothermal therapy.
2Reliability
If indocyanine green is used as a photothermal agent, then it can be accumulated in cancer cells due to EPR effect, but it is vulnerable to chemical decomposition by external light, solvents, and temperature changes
Solution Approach 1:
The polymeric surfactant shell acts as a protective barrier that shields the embedded dye molecules from harmful environmental factors including external light, solvents, and temperature variations. This shell maintains chemical stability while allowing the dye to retain its photothermal function.
Solution Approach 2:
The polymeric surfactant serves as an intermediary between the dye molecules and the external environment. It mediates the interaction by providing a stable microenvironment that protects the dye from degradation while still allowing the dye to perform its photothermal function when activated by near-infrared light.
3Duration of action of moving object
If hydrophilic cyanine dyes are used for photothermal therapy, then they can be administered systemically, but they are well absorbed into serum proteins and rapidly removed through kidneys
Solution Approach 1:
The composite structure of dye-loaded polymeric surfactant particles provides both extended circulation time and maintained biocompatibility. The polymeric surfactant shell prevents rapid renal clearance by increasing the effective size of the therapeutic agent, while the biocompatible polymer material maintains safety for systemic administration.
Solution Approach 2:
The invention changes the physical parameters of the dye by encapsulating it within polymeric surfactant particles. This size transformation (from small molecule to nanoparticle) fundamentally alters the pharmacokinetic profile, extending circulation time by preventing rapid renal filtration while maintaining biocompatibility through the use of medically accepted polymer materials.
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 composite particles exhibit improved photostability, photothermal efficiency, and cancer cell-specific accumulation, enabling effective photothermal therapy and imaging with reduced side effects and improved heat generation for therapeutic applications.
Implementation Method 1
near-infrared-absorbing dye-based composite particles which exhibit a photothermal effect and/or photoacoustic signal upon photoirradiation
Implementation Method 2
near-infrared-absorbing dye-based composite particles which exhibit a photothermal effect and/or photoacoustic signal upon photoirradiation
Data Source
AI summary
The present invention relates to near-infrared-absorbing dye-based composite particles which exhibit a photothermal effect and/or photoacoustic signal upon photoirradiation, a preparation method thereof, and a use thereof. The near-infrared-absorbing composite particles comprise: a water-insoluble salt of a near-infrared-absorbing dye, which comprises anions of the near-infrared-absorbing dye and metal cations capable of forming a precipitation product with the anions of the near-infrared-absorbing dye; and particles of a polymeric surfactant, in which a water-insoluble salt of the near-infrared-absorbing dye is supported in the hydrophobic part of the polymeric surfactant.