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Ternary phase diagrams and metastable zone width of azithromycin in water–acetone solvent mixtures

  • Xiaoxue Cao
  • Shaochang Ji
  • Wenjie Kuang
  • Anping Liao
  • Ping Lan
  • Jinyan ZhangEmail author
Article
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Abstract

The transition water activity of azithromycin in water–acetone solvent mixtures at temperatures 293.15 K, 298.15 K, 303.15 K and 308.15 K was determined under atmospheric pressure, and the ternary phase diagrams for the system of water–azithromycin–acetone at varying temperature were described. Results showed that azithromycin monohydrate can be obtained by lowering the water activity and the transition water activity in acetone–water solvent mixtures at temperatures (293.15 K, 298.15 K, 303.15 K and 308.15 K) was 0.17, 0.21, 0.242 and 0.287, which increased with temperature. Besides, the metastable zone width (MSZW) of azithromycin dihydrate in water–acetone solvent mixtures was measured by laser method. The effect of initial temperature and cooling rate on MSZW of azithromycin dihydrate was studied. It was observed that the MSZW decreases with the increase in initial temperature. Nevertheless, the MSZW becomes wider by enhancing the cooling rate. All the results are of great importance to develop a crystallization process for manufacturing azithromycin hydrate and could be helpful to other solvate transformation research.

Keywords

Azithromycin Water activity Ternary phase diagram Metastable zone width 

Notes

Funding

This work was supported by the National Natural Science Foundation of China (21606056), the Guangxi Natural Science Foundation of China (2017GXNSFAA198091), the Guangxi biological polysaccharide separation, purification and modification research platform (GKZY18076005), the Xiangsihu Young Scholars Innovative Research Team of Guangxi University For Nationalities (2016) and the Postgraduate Research Innovation Project of Guangxi University of Nationalities gxun-chxzb2017001 (gxun-chxzs2017128), gxun-chxzb2018001 (gxun-chxps201817).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Xiaoxue Cao
    • 1
  • Shaochang Ji
    • 2
  • Wenjie Kuang
    • 1
  • Anping Liao
    • 1
  • Ping Lan
    • 1
  • Jinyan Zhang
    • 1
    Email author
  1. 1.School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Guangxi Key Laboratory for Polysaccharide Materials and ModificationsKey Laboratory of Chemical and Biological Transformation Process of Guangxi Higher Education InstitutesNanningChina
  2. 2.Guangxi Tobacco Monopoly BureauNanningPeople’s Republic of China

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