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Original Article

Dehydration of CO2-α-cyclodextrin complex powder by desiccant adsorption method and its release properties

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Pages 763-772 | Received 09 Jul 2016, Accepted 07 Nov 2016, Published online: 28 Nov 2016
 

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 CaCl2 desiccants during post-dehydration were investigated. The results showed that CaCl2 reduced aw much faster than silica gel did under the same conditions. After approximately 60 h, aw of complex powders reduced using silica gel was almost constant at 0.247 (±0.012), while those treated with CaCl2, aw was 0.225 (±0.005) and had not yet reached their lowest value. Moisture adsorption by silica gel and CaCl2 also led to a decrease in the CO2 concentration of complex powder (higher decrease for silica gel adsorption) without affecting the structure and morphology of complex powder. The CO2 release 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.

Acknowledgements

The authors acknowledge the facilities, and the scientific and technical assistance, of the Australian Microscopy and Microanalysis Research Facility (CMM), SAFS, CNAFS and CAI centres at The University of Queensland. Special thanks to Dr. Ekaterina Strounina (CAI) for NMR measurement, to Dr. Anya Yago (CMM) for X-ray analyses. Thao M. Ho also acknowledges financial support from Australia Awards Scholarships.

Disclosure statement

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article.

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