Schiff Base Compounds for Blue Light Absorption and Stability
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Solution Overview
Problem
Current cosmetic solutions are inadequate in effectively filtering blue light, which contributes to skin aging, and existing blue-light absorbing compounds face challenges in stability and incorporation into formulations.
Innovation Solution
Development of a family of Schiff base compounds that absorb in the 400-500 nm wavelength interval, providing effective blue light absorption and stability in cosmetic formulations, including their use in topical applications for skin aging prevention and treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing blue-light absorbing compounds are used, then blue light filtering is provided, but stability in formulations is compromised
Solution Approach 1:
The patent modifies the chemical structure of existing blue light absorbing compounds by introducing specific substituent groups (halogens, alkyl groups, alkoxy groups) at defined positions on the molecular core. These parameter changes in molecular structure enhance photostability and formulation stability while preserving the 400-500 nm absorption capability, thereby resolving the contradiction between blue light filtering effectiveness and formulation stability.
Solution Approach 2:
The invention creates composite molecular structures combining a stable core structure (e.g., benzotriazole, triazine, or indazole rings) with various stabilizing substituent groups. This composite approach integrates multiple functional elements that work synergistically: the core provides blue light absorption while the substituents provide oxidative and photostability, thus achieving both blue light filtering and formulation stability simultaneously.
2Object-affected harmful factors
If blue light absorbing compounds are incorporated into cosmetic formulations, then skin aging prevention is achieved, but compound stability deteriorates
Solution Approach 1:
The patent systematically varies molecular parameters including substituent types (fluorine, chlorine, methyl, ethyl, methoxy groups), substituent positions (2, 4, 5, 6 positions on the core ring), and core structures (benzotriazole, triazine, indazole) to optimize the balance between skin protection efficacy and compound stability. These parameter modifications result in derivatives that maintain high blue light absorption efficiency while exhibiting superior stability profiles in cosmetic formulations.
Solution Approach 2:
The invention addresses the inherent instability of blue light absorbing compounds by introducing electron-withdrawing and electron-donating groups that stabilize the molecular structure through resonance and inductive effects. The halogen substituents (fluorine, chlorine) particularly enhance photostability by strengthening the molecular framework and reducing susceptibility to photo-degradation, thereby converting the potential harm of instability into a benefit of enhanced reliability.
3Object-affected harmful factors
If effective blue light absorption is achieved, then skin photoaging protection is improved, but formulation incorporation becomes difficult
Solution Approach 1:
The patent modifies physical-chemical parameters of the compounds including solubility, molecular weight, and lipophilicity through strategic substituent selection. These parameter changes enable the compounds to be effectively incorporated into various cosmetic formulation types (creams, lotions, serums) while maintaining their blue light absorption functionality. The balanced molecular design ensures compatibility with common cosmetic ingredients and formulation vehicles.
Solution Approach 2:
The invention introduces specific functional groups at specific positions on the molecular core to provide localized properties: the core structure provides blue light absorption, while peripheral substituents provide solubility, stability, and formulation compatibility. This local differentiation of molecular properties allows the compound to simultaneously achieve effective blue light filtering and easy formulation incorporation without compromising either function.
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 Schiff base compounds effectively absorb blue light, preventing and treating signs of skin aging such as wrinkles, hyperpigmentation, and sagging by maintaining stability in cosmetic formulations, thus offering a viable solution for blue light-induced skin damage.
Implementation Method 1
The Schiff base compounds prepared according to the invention show effective absorption in the 400-500 nm wavelength interval
Data Source
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AI summary
The present invention relates to the cosmetic use of compounds of formula (I) and cosmetic compositions comprising said compounds in the treatment and/or prevention of signs of skin aging, in particular signs of skin photoaging caused by blue light. The present invention also relates to methods for the cosmetic treatment and/or prevention of signs of skin aging, in particular signs of skin photoaging caused by blue light, comprising the topical application of compounds of formula (I) and cosmetic compositions comprising said compounds.