Acetylated-beta-cyclodextrin as well as preparation method and application thereof
A technology of cyclodextrin and acetylation, which is applied in the manufacture of tools, wood treatment, wood impregnation, etc., can solve the problems of nano-toxicity, difficult source of raw materials, cumbersome preparation, etc., and achieve good hydrophobicity, abundant raw materials, and simple preparation Effect
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Embodiment 1
[0030] A kind of preparation method of acetylated-beta-cyclodextrin of the present embodiment, comprises the following steps:
[0031] (1) Weigh 1g of β-cyclodextrin and dissolve it in 10mL of pyridine to obtain a mixed solution.
[0032] Slowly add acetic anhydride and 4-dimethylaminopyridine (DMAP) into the mixture of β-cyclodextrin, the molar ratio of β-cyclodextrin and acetic anhydride is 1:70, β-cyclodextrin and 4-dimethyl The mass ratio of aminopyridine (DMAP) was 1:0.08 to obtain a reaction solution, which was kept stirring at room temperature for 22 hours.
[0033] (2) Slowly add an appropriate amount of distilled water to the reaction solution obtained in step (1) to precipitate a precipitate, stand and filter, and vacuum-dry at 60° C. for 5 hours to obtain acetylated-β-cyclodextrin as a solid.
[0034] The acetylated-β-cyclodextrin solid prepared in this example has a lower degree of acetyl group substitution and retains more hydroxyl groups. The hydrophobicity is ...
Embodiment 2
[0036] A kind of preparation method of acetylated-beta-cyclodextrin of the present embodiment, comprises the following steps:
[0037] (1) Weigh 1g of β-cyclodextrin and dissolve it in 10mL of pyridine to obtain a mixed solution.
[0038]Slowly add acetic anhydride and 4-dimethylaminopyridine (DMAP) into the mixture of β-cyclodextrin, the molar ratio of β-cyclodextrin and acetic anhydride is 1:80, β-cyclodextrin and 4-dimethyl The mass ratio of aminopyridine (DMAP) was 1:0.12 to obtain a reaction solution, which was kept stirring at room temperature for 23 hours.
[0039] (2) Slowly add an appropriate amount of distilled water to the reaction solution obtained in step (1) to precipitate a precipitate, stand and filter, and vacuum-dry at 80° C. for 6.5 hours to obtain acetylated-β-cyclodextrin as a solid.
[0040] The acetylated-β-cyclodextrin solid prepared in this example has a medium degree of acetyl substitution and a medium number of hydroxyl groups. It can not only prov...
Embodiment 3
[0042] A kind of preparation method of acetylated-beta-cyclodextrin of the present embodiment, comprises the following steps:
[0043] (1) Weigh 1g of β-cyclodextrin and dissolve it in 10mL of pyridine to obtain a mixed solution.
[0044] Slowly add acetic anhydride and 4-dimethylaminopyridine (DMAP) into the mixture of β-cyclodextrin, the molar ratio of β-cyclodextrin and acetic anhydride is 1:90, β-cyclodextrin and 4-dimethyl The mass ratio of aminopyridine (DMAP) was 1:0.15 to obtain a reaction solution, which was kept stirring at room temperature for 24 hours.
[0045] (2) Slowly add an appropriate amount of distilled water to the reaction solution obtained in step (1) to precipitate a precipitate, stand and filter, and vacuum-dry at 100° C. for 8 hours to obtain acetylated-β-cyclodextrin as a solid.
[0046] The acetylated-β-cyclodextrin solid prepared in this example has a higher degree of acetyl substitution and fewer hydroxyl groups. Good hydrophobicity, but poor gra...
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