title: Dehydration of CO2-α-cyclodextrin complex powder by desiccant adsorption method and its release properties.
abstract: Stability and release properties of CO2-α-cyclodextrin complex powder prepared by solid encapsulation (water activity, aw≈ 0.95) followed by moisture removal using silica gel and CaCl2desiccants during post-dehydration were investigated. The results showed that CaCl2reduced awmuch faster than silica gel did under the same conditions. After approximately 60 h, awof complex powders reduced using silica gel was almost constant at 0.247 (±0.012), while those treated with CaCl2, awwas 0.225 (±0.005) and had not yet reached their lowest value. Moisture adsorption by silica gel and CaCl2also led to a decrease in the CO2concentration of complex powder (higher decrease for silica gel adsorption) without affecting the structure and morphology of complex powder. The CO2release properties of CaCl2-aw-reduced complex powder at different relative humidities (32.73, 52.86, 75.32 and 97.30% RH), liquid environments (water and oil) and packaging methods (normal and vacuum) were also studied.
authors.affiliation: a School of Agriculture and Food Sciences , The University of Queensland , Queensland , Australia.
authors.forename: Thao M
authors.initials: TM
authors.lastname: Ho
authors.affiliation: b School of Chemical Engineering , The University of Queensland , St. Lucia , Queensland , Australia.
authors.forename: Tony
authors.initials: T
authors.lastname: Howes
authors.affiliation: a School of Agriculture and Food Sciences , The University of Queensland , Queensland , Australia.
authors.forename: Bhesh R
authors.initials: BR
authors.lastname: Bhandari
mesh_terms: D000327:Adsorption; D002122:Calcium Chloride / Q000737:chemistry; D002245:Carbon Dioxide / Q000008:administration & dosage* / Q000737:chemistry; D003890:Desiccation / Q000379:methods*; D006813:Humidity; D058427:Hygroscopic Agents / Q000737:chemistry*; D011208:Powders; D058428:Silica Gel / Q000737:chemistry; D047391:alpha-Cyclodextrins / Q000737:chemistry*
chemical_list: D058427:Hygroscopic Agents; D011208:Powders; D047391:alpha-Cyclodextrins; D002245:Carbon Dioxide; D058428:Silica Gel; D002122:Calcium Chloride; C032613:alpha-cyclodextrin
keywords: Release properties; amorphous α-CD powder; complex powder; relative humidity; solid encapsulation