Citation: DENG Ying-Hui, SU Li-Na, PANG Yan-Hua, GUO Ya-Fei, WANG Fen, LIAO Xia-Li, YANG Bo. Preparation, Characterization and Water Solubility of Inclusion Complexes of Daidzein with Amino-modified β-Cyclodextrins[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(5): 648-653. doi: 10.11895/j.issn.0253-3820.160747 shu

Preparation, Characterization and Water Solubility of Inclusion Complexes of Daidzein with Amino-modified β-Cyclodextrins

DENG Ying-Hui ^1,2, ,
SU Li-Na ¹ ,
PANG Yan-Hua ³ ,
GUO Ya-Fei ² ,
WANG Fen ² ,
LIAO Xia-Li ² ,
YANG Bo ²

1.
Qujing Medical College, Qujing 655000, China;
2.
Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China;
3.
Armed Police Yunnan Corps and Qujing Detachment, Qujing 655000, China

Received Date: 9 October 2016
Revised Date: 10 February 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21362016).

To improve the water solubility of daidzein, solid inclusion complexes of daidzein with two amino-modified β-cyclodextrins (ACDs), i.e., mono-6-amino-6-deoxy-β-cyclodextrin (NCD) and mono-6-ethylenediamino-6-deoxy-β-cyclodextrin (ENCD), were prepared by the saturated solution method in water under the preparation conditions as follows: the ratio of daidzein/ACD was 3∶1 and the stirring time was 72 h (83% and 67% yields, respectively). The formation of two inclusion complexes was confirmed by x-ray diffractometry (XRD) and themogravimetric (TG) analysis. The inclusion stoichiometry of the inclusion complexes was 1∶1 from the Job plot and their complexation stability constants (K_S) were 899.2 and 203.8 L/mol from fluorescence titration, respectively. After formation of inclusion complexes with NCD and ENCD, the water solubility of daidzein was dramatically raised from 8.31 μg/mL to 15.2 and 13.2 mg/mL at 25℃, increasing by 1800-fold and 1500-fold.
- Daidzein,
- Amino-modified β-cyclodextrin,
- Solid inclusion complex,
- Binding behavior,
- Water solubility
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