Abstract
Cyclosophoraoses [cyclic β-(1,2)-glucan, Cys] isolated from Rhizobium leguminosarum biovar trifolii TA-1 have unique structures and high solubility, which make it a potent solubilizer for host–guest inclusion complexation. Succinylated cyclosophorasoses (S-Cys) were also synthesized by chemically modifying isolated cyclosophoraoses. In ultraviolet-visible studies using naproxen (NAP), Cys was shown to form the most stable complexes with NAP (K 1:1 = 2457.9 M−1), which was followed by the negatively charged S-Cys (K 1:1 = 357.1 M−1) at pH 3.4. A further strong reduction in the complex stability constant was observed at pH 7.5. When the reduction in the stability constant was compared with other cyclic oligosaccharides (Cys; 119.2 M−1, CD; 14.48 M−1 and HP-CD; 6.75 M−1), S-Cys (K 1:1 = 5.6 M−1) was shown to have the highest decrease in stability constant. These results suggest that the S-Cys could regulate the efficiency of inclusion complexation at external pH values. NMR studies of complex formation between NAP and Cys also showed a different correlation pattern at pH 3.4 and 7.5. This difference in correlation demonstrates that the inclusion complexes between Cys and NAP formed as a result of the differential charge distribution of the carboxyl groups of NAP. The pH-dependent inclusion behavior of Cys for NAP was also evaluated using molecular docking simulations.
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Abbreviations
- Cys:
-
Cyclosophoraoses
- S-Cys:
-
Succinlyated cyclsophoraoses
- NAP:
-
Naproxen
- CD:
-
β-Cyclodextrin
- HP-CD:
-
Hydroxypropyl-β-cyclodextrin
- MALDI-TOF:
-
Matrix assisted laser desorption/ionization-time of flight
- NMR:
-
Nuclear magnetic resonance
- DSC:
-
Differential scanning calorimetry
- ROESY:
-
Rotating frame nuclear overhauser effect spectroscopy
- DP:
-
Degree of polymerization
- TLC:
-
Thin layer chromatography
- DS:
-
Degree of substitution
- Deuterium oxide:
-
D2O
- Deuterium methanol:
-
CD3OD
- DEAE:
-
Diethylaminoethyl
- FID:
-
Free induction decay
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Acknowledgments
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (NRF-2011-0026022) and by Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0093824). SDG.
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Kwon, C., Choi, Y., Jeong, D. et al. Inclusion complexation of naproxen with cyclosophoraoses and succinylated cyclosophoraoses in different pH environments. J Incl Phenom Macrocycl Chem 74, 325–333 (2012). https://doi.org/10.1007/s10847-012-0119-7
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DOI: https://doi.org/10.1007/s10847-012-0119-7