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本文采用紫外分光光度法,对紫罗兰酮混合物中的α-紫罗兰酮和β-紫罗兰酮两种异构体同时进行测定。α-异构体的乙醇溶液的最大吸收波长为231nm(摩尔吸光系数ε=1.5×10~4)。而β-异构体的乙醇溶液的最大吸收波长为301nm(摩尔吸光系数ε=1.2×10~4),用浓度范围为0-10uglml的紫罗兰酮乙醇溶液制得标准曲线符合比耳定律。该法应用于紫罗兰酮系列产品的分折,也可用于合成香料的理论研究工作方面。该法简便、精确、快速,分折结果令人满意。
In this paper, the two isomers of α-ionone and β-ionone in the mixture of ionone were measured simultaneously by UV spectrophotometry. The maximum absorption wavelength of the α-isomer in ethanol solution was 231 nm (molar absorptivity ε = 1.5 × 10 -4). The maximum absorption wavelength of the β-isomer ethanol solution was 301 nm (Molar Absorption Coefficient ε = 1.2 × 10 -4). The standard curve was fitted with Beer’s Law using ionone in a concentration range of 0-10 μg ml. The method is applied to the break-up of ionone series products and also can be used in theoretical research of synthetic perfumery. The method is simple, accurate, rapid, sub-satisfactory results.