Solubility of (+)-Usnic Acid in Water, Ethanol, Acetone, Ethyl Acetate and n-Hexane |
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| Authors: | Ju-qing Jin Yong Rao Xiao-li Bian Ai-guo Zeng Guang-de Yang |
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| Institution: | 1. School of Science, Xi’an Jiaotong University, No. 28 Xianning Westroad, Xi’an, 710049, Shaanxi, People’s Republic of China
2. School of Medicine, Xi’an Jiaotong University, No. 76 Yanta Westroad, Xi’an, 710061, Shaanxi, People’s Republic of China
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| Abstract: | Using ultraviolet spectrophotometry, the solubility of (+)-usnic acid in water, ethanol, acetone, ethyl acetate and n-hexane were measured at temperatures from (278.15 to 338.15) K at atmospheric pressure. The results obtained led to the solubility order: ethyl acetate > acetone > n-hexane > ethanol > water. The solubility values were correlated with the Apelblat equation, the λh equation and the ideal model. The results showed that these three models agreed well with the experimental data. |
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