Functionalized Carbonate-Hydroxyapatite for Controlled Germicide Release
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Solution Overview
Problem
Current hydroxyapatite-based carriers for germicidal substances in cosmetics lack controlled and long-lasting antimicrobial activity, as they do not effectively release the agents in response to specific conditions, leading to inconsistent protective action.
Innovation Solution
Carbonate-hydroxyapatite functionalized with germicides such as chlorhexidine and cetylpyridinium halides, which allows for controlled release based on synthesis conditions and pH modifications, providing a more homogeneous particle structure for enhanced biocompatibility and antimicrobial activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydroxyapatite is used as a carrier for germicidal substances, then antimicrobial activity is provided, but the release of germicidal agents is uncontrolled and inconsistent
Solution Approach 1:
The patent modifies the chemical composition parameters of hydroxyapatite by incorporating carbonate ions to replace some phosphate groups, creating carbonate-hydroxyapatite. This compositional parameter change fundamentally alters the release kinetics of incorporated germicidal substances, enabling controlled and prolonged release while maintaining consistent antimicrobial activity.
Solution Approach 2:
The invention creates a composite material system where carbonate-hydroxyapatite serves as a carrier matrix for germicidal substances. The composite structure combines the biocompatibility and controlled release properties of carbonate-hydroxyapatite with the antimicrobial efficacy of incorporated substances like chlorhexidine or cetylpyridinium chloride, achieving both reliable and sustained antimicrobial action.
2Speed
If germicide is incorporated during formation of C-Hap particles, then rapid release in response to pH modifications is achieved, but controlled and prolonged release is not obtained
Solution Approach 1:
The patent creates two distinct populations of carbonate-hydroxyapatite particles with different germicide incorporation characteristics. Some particles contain germicide incorporated during formation for rapid, pH-responsive release, while others have germicide added after formation for controlled, prolonged release. This local differentiation of release properties within the overall carrier system enables both fast and sustained antimicrobial action.
3Reliability
If conventional hydroxyapatite is used as carrier, then biocompatibility is provided, but particle organization homogeneity is insufficient
Solution Approach 1:
The patent modifies the synthesis parameters of hydroxyapatite, specifically controlling the carbonate content (0.3-20 wt%) and the timing of germicide incorporation. These parameter changes result in more homogeneous particle organization and composition while preserving the excellent biocompatibility inherent to hydroxyapatite 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 functionalized carbonate-hydroxyapatite achieves a controlled and prolonged release of germicides, improving biocompatibility and antimicrobial efficacy in cosmetic compositions, particularly in oral care, by adjusting release kinetics in response to environmental pH, ensuring consistent protective action.
Implementation Method 1
functionalized with a germicide... wherein said germicide is chosen among chlorhexidine and its salts... adsorption of chlorhexidine on synthetic hydroxyapatite
Data Source
AI summary
The present invention relates to a carbonate-hydroxyapatite functionalized with a germicide, chosen among chlorhexidine and its salts, benzalkonium halides, diisobutyl phenoxyethoxyethyl dimethyl benzyl ammonium halides, alkyl dimethyl ethylbenzyl ammonium halides, cetylpyridinium halides and mixtures thereof.The present invention also relates to cosmetic compositions, such as oral care compositions or skin-care compositions, comprising said functionalized carbonate-hydroxyapatite.