【摘要】 本研究旨在合成具有液晶特性的油酸甾醇酯，并通过微胶囊化技术提升其稳定性和紫外阻隔性能。油酸甾醇酯通过植物甾醇与油酸酯化反应制备，采用红外光谱（FTIR）和质谱（MS）表征其分子结构，利用偏光显微镜（POM）、热重分析（TGA）、差示扫描量热法（DSC）、广角与小角X射线散射（WAXS、SAXS）表征其液晶行为，并测定其紫外阻隔性能。为提升液晶结构的稳定性，利用乳液聚合法将其微胶囊化。针对包含液晶、液晶微胶囊和纳米二氧化钛的防晒配方进行SPF值测试。结果显示，油酸甾醇酯表现出典型的胆甾相液晶行为及UVA强紫外吸收；且微胶囊化进一步提升了其稳定性和紫外阻隔性能，SPF测试表明，含有液晶微胶囊的配方SPF值达到7.01，高于含纳米二氧化钛的配方（SPF=6.23），且显著优于含未包裹液晶的配方（SPF=2.65），说明液晶微胶囊有效保护了液晶结构，维持了其紫外阻隔性能。本研究表明，微胶囊化的油酸甾醇酯在防晒配方中具有应用潜力，能够提供更高的稳定性与高效的紫外防护性能，展示出在创新化妆品产品中的应用前景。更多还原

【Abstract】 This study reports the synthesis of oleic acid sterol ester with liquid crystalline properties and its enhanced stability and UV-blocking performance through microencapsulation. Oleic acid sterol ester was synthesized via the esterification of phytosterol and oleic acid, whose structure was characterized using Fourier-transform infrared spectroscopy(FTIR) and mass spectrometry(MS). Its liquid crystalline behavior was confirmed via the polarized optical microscopy (POM), thermogravimetric analysis(TGA), differential scanning calorimetry(DSC), wide-angle X-ray scattering(WAXS), and small-angle X-ray scattering(SAXS). UV absorption tests were conducted to assess the UV-blocking performance of the oleic acid sterol ester liquid crystals. To improve the stability of its liquid crystalline structure, the oleic acid sterol ester was encapsulated into microcapsules through the emulsion polymerization. SPF measurements were performed on the sunscreen formulations containing liquid crystal microcapsules. The oleic acid sterol ester displayed cholesteric liquid crystalline behavior and strong UVA absorption, which indicates its suitability as a natural UV absorber. Microencapsulation further enhanced its stability and UV-blocking properties. SPF testing showed that the formulations with microcapsules achieved an SPF value of 7.01, which surpasses the nano titanium dioxide(SPF=6.23) and significantly outperform the unencapsulated liquid crystal formulations(SPF=2.65). This study highlights the potential of microencapsulated oleic acid sterol ester as a novel UV absorber in the sunscreen formulations, offers the enhanced stability and effective UV protection, and showcases its application potential in the innovative cosmetic products.更多还原