Solubility of β-cyclodextrin in different mixed solvents

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The solubility ofβ-cyclodextrin (β-CD) in ionic liquid/N,N-dimethyl-acetamide (IL/DMAC) mixed solvent and in LiCI/DMAC mixed solvent was investigated at 323.15 K and 353.15 K.The results showed that the solubility ofβ-CD in IL/DMAC system increased with increasing temperature,but decreased in LiCI/DMAC system.β-CD had the highest solubility in IL/DMAC system with [Cl]~- or [Br]~- anions.The solubility ofβ-CD in LiCl/DMAC system was lower than that in IL/DMAC system with [Cl]~- or [Br]~- anions but higher than that in IL/DMAC system with weak-coordinated anions (e.g [BF_4]~- or [PF_6]~-).The effects of substituent groups (benzyl and butyl) of cation and the structure of cations onβ-cyclodextrin solubility were also investigated. The solubility of β-cyclodextrin (β-CD) in ionic liquid / N, N-dimethyl-acetamide (IL / DMAC) mixed solvent and in LiCI / DMAC mixed solvent was investigated at 323.15 K and 353.15 K.The results showed that the solubility of β- of β-CD in IL / DMAC system increased with increasing temperature, but decreased in LiCI / DMAC system. β-CD had the highest solubility in IL / DMAC system with [Cl] ~ - [Br] -CD in LiCl / DMAC system was lower than that in IL / DMAC system with [Cl] ~ - [Br] ~ - anions but higher than that in IL / DMAC system with weak- coordinated anions (eg [BF_4] or [PF_6] ~ -). The effects of substituent groups (benzyl and butyl) of cation and the structure of cations on β-cyclodextrin solubility were also investigated.
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