Cationized Hyaluronic Acid Adhesion via Charge Reversal
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Solution Overview
Problem
Hyaluronic acid, commonly used in cosmetics for its moisturizing properties, has limited adhesion to hair and skin due to its negative charge, resulting in inadequate moisturizing effects.
Innovation Solution
Cationized hyaluronic acid with a quaternary ammonium group is introduced, allowing it to bond with the oxygen atom of the carboxyl group, achieving a positive charge and enhanced adhesion to hair and skin, while maintaining its moisturizing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hyaluronic acid is used as a cosmetic component, then moisturizing effect is improved, but adhesion to hair and skin deteriorates due to negative charge repulsion
Solution Approach 1:
The patent changes the electrical charge parameter of hyaluronic acid from negative to positive by introducing quaternary ammonium groups. This parameter change allows the molecule to overcome the repulsion force with negatively charged hair and skin surfaces, achieving strong adhesion while preserving the moisturizing effect through the hyaluronic acid backbone structure.
Solution Approach 2:
The patent creates a composite molecular structure by combining hyaluronic acid with quaternary ammonium groups. This composite structure integrates the moisturizing properties of hyaluronic acid with the cationic characteristics of quaternary ammonium compounds, resulting in a molecule that simultaneously achieves adhesion and moisturizing effects.
2Strength
If quaternary ammonium group is introduced to enhance adhesion, then adhesion to living tissue is improved, but manufacturing complexity increases
Solution Approach 1:
The patent controls the degree of cationization as a key parameter to optimize the balance between adhesion and manufacturing complexity. By adjusting the degree of cationization within a specific range (0.1 to 0.5), the patent achieves sufficient adhesion while avoiding excessive complexity in the manufacturing process and potential side effects.
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 cationized form exhibits excellent adhesion and moisturizing effects, effectively reducing hair and skin dryness and roughness, making it suitable for hair and skin modifying agents and cosmetic preparations.
Implementation Method 1
the quaternary ammonium group-containing group is bonded to an oxygen atom of a (-C(=O)O-) group
Implementation Method 2
The surface of hair or skin is normally negatively charged. Hyaluronic acid is also normally negatively charged due to the presence of an anionic functional group (e.g., carboxyl group). Therefore, when treating hair using hyaluronic acid, hyaluronic acid and the hair repel each other since the surface of the hair and hyaluronic acid are negatively charged
Data Source
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AI summary
A cationized hyaluronic acid and/or a salt thereof includes a quaternary ammonium group-containing group, and has a degree of cationization of 0.15 to 0.6.