摘要:本论文首先通过使用紫外分光光度法测定0.1g/L文生素C葡糖苷(AA-2G)和0.1g/L文生素C乙基醚的紫外吸收光谱,确定其最大吸光度及波长为2.766和260nm,随后分别配制0.001g/L、0.002g/L、0.003g/L、0.004g/L、0.005g/L、0.006g/L、0.008g/L、0.010g/L的文生素C葡糖苷和文生素C乙基醚的标准溶液,通过紫外分光光度法绘制其标准曲线,然后用0.01g/L的文生素C葡糖苷和0.01g/L文生素C乙基醚分别放置在高温(45℃),低温(-15℃),室温,光照下7天再测试其紫外吸收光谱,观察其稳定性,发现文生素C葡糖苷和文生素C乙基醚在光照和高温条件下吸光度基本无变化,而在低温7天后,两者的吸光度值分别降低了21.85%和34.12%,这表明两者在低温条件下不稳定;再将文生素C葡糖苷和文生素C乙基醚运用于面膜配方和试样中,测试其稳定性,发现经过一年半后面膜中文生素C葡糖苷损耗了18.8%,属于比较稳定,而文生素C乙基醚在试样中经过一年时间后基本无变化,很稳定;从而总结文生素C葡糖苷和文生素C乙基醚等文生素C衍生物在化妆品中的稳定性。41166 毕业论文关键词: 紫外分光光度法;文生素C葡糖苷;文生素C乙基醚;化妆品
Study on the stability of Vitamin C derivatives in cosmetics
Abstract:. In this paper, the UV absorption spectra of 0.1g/L ascorbyl glucoside and 0.1g/L vitamin C ethyl ether were determined by UV spectrophotometry. The standard solution of 0.001g/L, 0.002g/L, 0.003g/L, 0.004g/L, 0.005g/L, 0.006g/L, 0.008g/L, 0.010g/L ascorbyl glucoside and vitamin C ethyl ether were separately formulated. The standard curve was drawn by UV spectrophotometry. Then the 0.01g/L ascorbyl glucoside and 0.01g/L vitamin C ethyl ether were placed in high temperature (45 degrees Celsius), low temperature (-15 degrees C), room temperature, under the light of 7 days to test its UV absorption spectrum, observe its stability. Found that ascorbyl glucoside and vitamin C glucoside ethyl ether in the light and heat conditions absorbance did not change, and in low temperature for 7 days, both absorbance value reduce 21.85% and 34.12% respectively, which indicates that the stability of them under the condition of low temperature. The ascorbyl glucoside and vitamin C ethyl ether were used in the mask formula and the sample, and the stability was tested. Found that after a year and a half after the loss of ascorbyl glucoside 18.8% in the mask, are relatively stable. The vitamin C ethyl ether in the sample after a year after the basic no change, very stable. In order to summarize the stability of ascorbyl glucoside and vitamin C ethyl ether and other vitamin C derivatives in cosmetics.
Key Words: Ultraviolet spectrophotometric;ascorbyl glucoside;Vitamin C ethyl ether;Cosmetics