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Hydrotrope
Hydrotrope
Imidazolium compounds, 1-[2-(2-carboxyethoxy)ethyl]-1(or 3)-(2-carboxyethyl)-4,5-dihydro-2-norcoco alkyl
(68919-40-4)-
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Isostearamidopropyl Morpholine Oxide
(123813-16-1)-
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More Information
Hydrotrope is a substance used in formulating aqueous cosmetics such as serums and toners, to enhance the solubility of substances that are insoluble or sparingly soluble in water, allowing them to dissolve completely and form a transparent solution.
When surfactants are added to water, the surface tension of water rapidly decreases, leading to the formation of micelles where surfactant molecules aggregate. The concentration of surfactant required to form these micelles is known as the critical micelle concentration. Once this concentration is reached, micelles can encapsulate oil or solid particles at the hydrophobic end, thereby increasing the solubility of sparingly soluble or insoluble substances.
In cosmetics, hydrotropes are primarily used in:
•Toners
•Hair oils
•Conditioners
Frequently Asked Questions
A hydrotrope is a compound that enhances the solubility of hydrophobic substances in water by forming non-covalent interactions, without forming micelles like surfactants. Common hydrotropes include sodium xylene sulfonate, sodium toluene sulfonate, and urea derivatives. They are widely used in detergents, personal care products, and industrial formulations to improve clarity, stability, and performance of aqueous solutions containing poorly soluble ingredients.
Hydrotropes are commonly used in liquid detergents, shampoos, body washes, and cleaning formulations to prevent cloudiness and phase separation. In industrial settings, they help solubilize dyes, fragrances, and active ingredients in agrochemicals or pharmaceuticals. Their ability to maintain product homogeneity and enhance ingredient compatibility makes them essential in formulating stable, high-performance aqueous systems.
Unlike surfactants, which form micelles above a critical micelle concentration (CMC) to solubilize oils, hydrotropes operate at lower concentrations and do not self-assemble into structured aggregates. They increase solubility through weak, dynamic interactions with solute molecules. Compared to co-solvents like ethanol, hydrotropes are more effective at low doses and less likely to affect product volatility or irritation potential, making them preferred in eco-friendly and mild formulations.
When choosing a hydrotrope, consider its solubilizing efficiency for the target ingredient, compatibility with other formulation components (e.g., surfactants, preservatives), pH stability, biodegradability, and regulatory status (e.g., EPA, REACH, or FDA compliance). Cost-effectiveness, odor, color, and impact on product viscosity or foaming are also important. For example, sodium cumene sulfonate is often selected for clear liquid detergents due to its high solubility and low foaming profile.
Yes, many hydrotropes such as sodium xylene sulfonate and sodium toluene sulfonate are approved for use in cosmetics and household cleaners by regulatory bodies including the U.S. FDA and EU Cosmetic Regulation. They are generally recognized as safe when used within recommended concentrations. However, proper toxicological assessment and adherence to usage limits are essential to ensure consumer safety and environmental sustainability.