纯天然植物紫外吸收剂的光谱特性研究

纯天然植物紫外吸收剂是一种高安全性、无副作用且有发展前景的化妆品新型紫外吸收添加剂。纯天然植物紫外吸收剂是由对紫外光有吸收作用的草本植物通过干品粉碎，用有机溶剂萃取、真空干燥后获得。新型紫外吸收剂固体呈现暗褐色，用乙醇和水配成溶液(紫外吸收剂原液)呈淡黄色。本文主要用紫外-可见分光光度计测定新型纯天然植物紫外吸收剂的紫外吸收光谱，分析结果发现，紫外吸收剂在UVC区和UVB区其相对透射率均小于0.2%，最大值出现在UVA区约375 nm处也仅为2.1%。说明新型天然植物紫外吸收剂对紫外线有较好的吸收，能屏蔽各种波长的紫外光。

Study on Spectral Properties of Natural Plant Ultraviolet Absorbent

Natural plant ultraviolet absorbent is a safe cosmetic typed ultraviolet additive, with no side effect and bright future. Natural plant ultraviolet absorbent is ground from ultraviolet absorbing plant into organic solvent under dry vacuum condition. This new type of ultraviolet absorbent has brown colour in solid form, but when it mixes with alcohol and water, its colour changes to light yellow in liquid form. This paper focuses mainly on using ultraviolet/visible spectrometer to examine its spectral properties under ultraviolet light. The result shows that this absorbent has a relative transmittance below 0 2% in the UVC and UVB zones, while in the UVA zone around 375 nm, the value raises up only to 2 1%. This concludes that the natural plant ultraviolet absorbent has a high absorbing ability under ultraviolet light and can withstand ultraviolet light with long wavelength.