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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
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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
目录
1 前言 1
1.1 化妆品的定义 1
1.2 化妆品的分类及质量特性 2
1.3 化妆品原料的稳定性及其影响因素 3
1.4 化妆品科学新进展 4
1.5 文生素的定义 5
1.6 化妆品中文生素的种类及应用 5
1.7 文生素C在化妆品中存在的问题 6
1.8 文生素C衍生物在化妆品中的研究进展 6
1.9 文生素C衍生物研究的目的及意义 7
2 实验原理和实验方法 9
2.1 使用的材料试剂、仪器设备 9
2.1.1 原料和试剂 9
2.1.2 溶液的制备 9
2.1.3 仪器 9
2.2 实验原理 9
2.3 实验方法 10
3 实验内容 12
3.1 AA-2G稳定性研究 12
3.1.1 AA-2G紫外吸收光谱的测定 12