Skin Depigmentation Composition With Reduced Irritation and Odor
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Solution Overview
Problem
Existing skin depigmentation agents, such as hydroquinone and thiol compounds, cause significant irritation, cytotoxicity, and have stability issues, while cysteamine formulations suffer from unpleasant odors and poor compliance due to slow depigmentation and inflammation risks with higher acid concentrations.
Innovation Solution
A composition comprising 0.2% to 20% w/w of cysteamine or its salt, 0.2% to 20% w/w of azabenzene-4-carboxamide or its salt, and 2% to 20% w/w of glycolic acid, which provides a synergistic effect for immediate and long-term depigmentation, reduced irritation, and odor masking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydroquinone is used for depigmentation, then depigmentation efficacy is improved, but skin irritation and cytotoxicity increase
Solution Approach 1:
The patent combines multiple depigmenting agents (cysteamine, azabenzene-4-carboxamide, and glycolic acid) in a synergistic formulation. This merging of compounds achieves effective depigmentation while reducing the individual irritancy of each component, particularly through the anti-inflammatory and soothing properties of glycolic acid that counterbalance the potential irritation from cysteamine and azabenzene-4-carboxamide.
Solution Approach 2:
The invention creates a composite depigmenting formulation comprising cysteamine (0.1-10%), azabenzene-4-carboxamide (0.1-10%), and glycolic acid (1-20%). This composite material leverages the complementary mechanisms of action of each component: cysteamine for melanin inhibition, azabenzene-4-carboxamide for additional depigmentation, and glycolic acid for both depigmentation and skin soothing, achieving efficacy with reduced side effects.
2Productivity
If cysteamine is used for depigmentation, then depigmentation effect is achieved, but unpleasant odor increases
Solution Approach 1:
The patent combines cysteamine with azabenzene-4-carboxamide and glycolic acid in a unified formulation. This combination achieves the depigmentation effect of cysteamine while the other components, particularly glycolic acid, help mask or reduce the unpleasant sulfur-like odor characteristic of cysteamine, improving patient compliance.
3Productivity
If higher concentrations of organic acids are used with cysteamine, then depigmentation efficacy is improved, but inflammation risk increases
Solution Approach 1:
The patent optimizes the concentration parameters of the formulation components, specifically using glycolic acid at 1-20% in combination with cysteamine at 0.1-10% and azabenzene-4-carboxamide at 0.1-10%. This parameter optimization allows for effective depigmentation while the anti-inflammatory properties of glycolic acid at these concentrations help mitigate the inflammation risk that would otherwise be associated with higher acid concentrations.
4Productivity
If Vitamin C is used for depigmentation, then depigmentation effect is achieved, but formulation stability decreases
Solution Approach 1:
The patent creates a stable composite formulation using azabenzene-4-carboxamide, which is chemically more stable than Vitamin C in aqueous environments. This composite material provides consistent depigmentation efficacy without the oxidation, discoloration, and odor changes that plague Vitamin C formulations, while maintaining formulation stability over time.
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 combination achieves rapid skin lightening, enhanced shelf-life, and improved patient compliance by minimizing irritation and odor, with a noticeable effect within seconds and significant depigmentation after 8 weeks.
Implementation Method 1
These processes result in the synthesis and transfer of a pigment, melanin... The composition... provides... increased the long-term depigmenting efficacy... for inhibiting, reducing or preventing skin pigmentation
Data Source
AI summary
The present invention relates to a composition comprising cysteamine, azabenzene-4-carboxamide and glycolic acid. The present invention also relates to the cosmetic use thereof for inhibiting, reducing or preventing skin pigmentation and to the therapeutical use thereof for inhibiting, reducing or preventing skin hyperpigmentation diseases or disorders.