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Title
Preparation of regenerated cellulose bead and its coating with cyclodextrins
Authors
TING WANG BIN LI HONGYAN SI
Received
March 1, 2012
Published
Volume 47 Issue 1-2 January-February
Keywords
cellulose bead, cyclodextrin, esterification, encapsulation
Abstract
A study on grafting functional host molecules of cyclodextrins (CDs) onto cellulose beads is reported in this paper.
Cellulose beads were prepared by our self-made circumrotation centrifugal machine. Host molecules of β-cyclodextrin
(β-CD), (2,6-dimethyl)-β-cyclodextrin (DM-β-CD), and (2-hydroxypropyl)-β-cyclodextrin (HP-β-CD) were grafted
onto the surface of the cellulose beads in the presence of polycarboxylic acids, such as 1,2,3,4-butanetetracarboxylic
acid or citric acid. The optimum preparation conditions, including curing temperature, β-CD concentration in
impregnation solution and catalyst, were evaluated by the grafting rate and the active β-CD content, respectively.
DM-β-CD and HP-β-CD, as long as they carried enough remaining OH groups, could be successfully grafted on the
cellulose beads. Besides, depending on the results of phenolphthalein probe detection, materials weight gain, FTIR
spectroscopy and, SEM microscopic observation, the factors that influence the encapsulation ability of the functional
spherical biomaterials were discussed in detail.
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