A recent study published in the International Journal of Cosmetic Science has revealed that caprylic acid-based hydrophobic natural eutectic solvents (HNES) can serve as multifunctional ingredients in cosmetic cream formulations, paving the way for the development of sustainable skincare products. Through systematic experiments, the research validated the significant potential of these green solvents in improving product stability, regulating rheological properties, and optimizing sensory experiences.
    The research team designed four HNES formulations composed of caprylic acid combined with natural components such as lauric acid, 1,3-propanediol, and menthol, which were incorporated into an O/W cream base meeting COSMOS standards at a 10% weight ratio. After 30 days of accelerated aging tests, three formulations demonstrated excellent physical stability, with only the menthol-based HNES showing phase separation. Rheological analysis indicated that all HNES-containing creams exhibited shear-thinning behavior, with lower viscosity than traditional formulations at low shear rates and converging with control samples at high shear rates, balancing ease of use and application comfort.
    Sensory evaluation showed that the addition of HNES significantly enhanced the odor intensity of the creams, improved spreadability, and reduced hardness. Among them, the caprylic acid/lauric acid (4:1) formulation excelled in pick-up feel and penetration, while the caprylic acid/1,3-propanediol (5:1) formulation enhanced the product's whitening effect. These property optimizations stem from the unique molecular interactions of HNES and their compatibility with emulsion systems, and their biodegradable and renewable characteristics align with the green transformation trend of the cosmetics industry.
    The study leader noted that HNES can not only act as solubilizers for active ingredients but also enable precise regulation of cream texture and appearance through component ratio adjustment, providing more innovative space for formulators. This discovery responds to consumers' demand for safe and sustainable beauty products and offers practical solutions for the cosmetics industry to implement green chemistry principles.

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