Improvement in thermal stability of sucralose by γ-cyclodextrin metal-organic frameworks

Nana Lv, Tao Guo, Botao Liu, Caifen Wang, Vikaramjeet Singh, Xiaonan Xu, Xue Li, Dawei Chen, Ruxandra Gref, Jiwen Zhang

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Purpose: To explain thermal stability enhancement of an organic compound, sucralose, with cyclodextrin based metal organic frameworks.
Methods: Micron and nanometer sized basic CD-MOFs were successfully synthesized by a modified vapor diffusion method and further neutralized with glacial acetic acid. Sucralose was loaded into CD-MOFs by incubating CD-MOFs with sucralose ethanol solutions. Thermal stabilities of sucralose-loaded basic CD-MOFs and neutralized CD-MOFs were investigated using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and high performance liquid chromatography with evaporative light-scattering detection (HPLC-ELSD).
Results: Scanning electron microscopy (SEM) and powder X-ray diffraction (PXRD) results showed that basic CD-MOFs were cubic crystals with smooth surface and uniform sizes. The basic CD-MOFs maintained their crystalline structure after neutralization. HPLC-ELSD analysis indicated that the CD-MOF crystal size had significant influence on sucralose loading (SL). The maximal SL of micron CD-MOFs (CD-MOF-Micro) was 17.5 ± 0.9% (w/w). In contrast, 27.9 ± 1.4% of sucralose could be loaded in nanometer-sized basic CD-MOFs (CD-MOF-Nano). Molecular docking modeling showed that sucralose molecules preferentially located inside the cavities of γ-CDs pairs in CD-MOFs. Raw sucralose decomposed fast at 90°C, with 86.2 ± 0.2% of the compound degraded within only 1 h. Remarkably, sucralose stability was dramatically improved after loading in neutralized CD-MOFs, with only 13.7 ± 0.7% degradation at 90°C within 24 h.
Conclusions: CD-MOFs efficiently incorporated sucralose and maintained its integrity upon heating at elevated temperatures.
Original languageEnglish
Pages (from-to)269-278
Number of pages10
JournalPharmaceutical Research
Volume34
Issue number2
DOIs
Publication statusPublished - Feb 2017
Externally publishedYes

Keywords

  • cyclodextrin metal-organic frameworks
  • sucralose
  • thermal stability

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