Substituted Hydroxyapatite Solar Filter for UV Protection
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Solution Overview
Problem
Current solar filters, particularly those containing TiO2 and ZnO nanoparticles, pose concerns due to phototoxicity, skin penetration, and environmental ecotoxicity, leading to health and environmental issues.
Innovation Solution
A composition comprising an organic matrix with hydroxyapatite nanoparticles substituted with titanium and/or iron ions, produced through a biomineralization process, which reduces phototoxicity and skin penetration while maintaining effective UV protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TiO2 and ZnO nanoparticles are used in solar filters, then UV protection effectiveness is improved, but phototoxicity and skin penetration increase
Solution Approach 1:
Hydroxyapatite nanoparticles serve as an intermediary substance that provides UV protection without the harmful photocatalytic properties of TiO2 and ZnO. The hydroxyapatite particles are incorporated into the solar filter formulation, acting as a mediator that blocks UV radiation while being biocompatible and non-toxic to skin cells
Solution Approach 2:
The patent changes the chemical composition parameter by replacing transition metal oxides (TiO2, ZnO) with calcium phosphide-based hydroxyapatite nanoparticles. This parameter change maintains the particle size and physical barrier properties for UV protection while fundamentally altering the chemical properties to eliminate photocatalytic activity and associated phototoxicity
2Reliability
If TiO2 and ZnO nanoparticles are used in solar filters, then UV protection effectiveness is improved, but environmental ecotoxicity increases
Solution Approach 1:
Hydroxyapatite nanoparticles act as an environmentally benign intermediary that provides the same UV protection function as TiO2 and ZnO without the ecotoxic effects. These biocompatible particles can be safely released into the environment during product use and disposal without harming aquatic or terrestrial ecosystems
Solution Approach 2:
The patent employs hydroxyapatite, a naturally occurring mineral found in bones and teeth, as a replaceable and biodegradable alternative to persistent nanoparticle filters. This approach allows the solar filter to be disposed of without long-term environmental accumulation, as hydroxyapatite integrates harmlessly into natural ecosystems
3Reliability
If chemical UV filters are used, then UV protection is provided, but photodegradation and free radical generation occur
Solution Approach 1:
The patent replaces chemical UV filtering mechanisms with a physical barrier approach using hydroxyapatite nanoparticles. Instead of relying on chemical molecules that absorb UV radiation and undergo photodegradation, the physical particles provide a reflective and scattering barrier that passively blocks UV rays without chemical transformation or free radical generation
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 solution provides a safer, more effective solar filter with reduced phototoxicity and skin penetration, offering enhanced UV protection without the environmental and health risks associated with traditional nanoparticle-based filters.
Implementation Method 1
particles of hydroxyapatite substituted with titanium and/or iron ions... capable of absorbing UV rays
Implementation Method 2
produced through a biomineralization process
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E~1F
AI summary
The present invention relates to a composition for the protection against solar radiation, consisting of an organic matrix, preferably a gelatin, and hydroxyapatite nanoparticles modified by the substitution of part of the phosphorus with titanium, and part of the calcium with iron.