无毒紫外吸收剂的制备及光谱特性分析

Extraction and Spectral Properties Analysis of Innoxious Ultraviolet Absorbents

对鸡蛋花树叶、芒果树叶、桂花树叶等几十种天然植物进行紫外吸收剂的提取，并对提取的紫外吸收剂进行光谱特性分析。通过对光谱特性分析结果的比较，选择紫外吸收效果最好的植物，探索提取紫外吸收剂的方法。结果显示，以芒果树叶为原料，蒸馏水为提取溶剂，乙醇为沉淀剂，得到的紫外吸收剂效果好，提取物配制成浓度为1％（ω／ω）的溶液，在整个紫外区（200～400nm）紫外光透过率不超过1％。产物无毒，收率为1．5％。

Some dozens of ultraviolet absorbents were extracted from leaves of pure natural plants, such as frangipani, mango, and sweet-scented osmanthus. Then the spectral properties of these ultraviolet absorbents were analyzed. The plant that has the best effect of absorbing ultraviolet ray was selected by comparing one with the others. And the method of extracting ultraviolet absorbent was studied. The results showed that the method, which used leaves of mango as material, distilled water as extracted solvent, and alcohol as precipitator, was satisfactory. When the concentration of ultraviolet absorbent solution is 1%（ω/ω）, the ultraviolet ray transmission is smaller than 1% in 200-400 nm. The rate of production is 1.5%. It is innoxious.