title: Novel Solid Encapsulation of Ethylene Gas Using Amorphous α-Cyclodextrin and the Release Characteristics.
abstract: This research investigated the encapsulation of ethylene gas into amorphous α-cyclodextrins (α-CDs) at low (LM) and high (HM) moisture contents at 1.0-1.5 MPa for 24-120 h and its controlled release characteristics at 11.2-52.9% relative humidity (RH) for 1-168 h. The inclusion complexes (ICs) were characterized using X-ray diffractometry (XRD), nuclear magnetic resonance spectroscopy (CP-MAS (13)C NMR), and scanning electron microscopy (SEM). Ethylene concentrations in the ICs were from 0.45 to 0.87 mol of ethylene/mol CD and from 0.42 to 0.54 mol of ethylene/mol CD for LM and HM α-CDs, respectively. Ethylene gas released from the encapsulated powder at higher rates with increasing RH. An analysis of release kinetics using Avrami's equation showed that the LM and HM amorphous α-CDs were not associated with significant differences in release constant k and parameter n for any given RH condition. NMR spectra showed the presence of the characteristic carbon-carbon double bond of ethylene gas in the encapsulated α-CD powder.
authors.affiliation: School of Agriculture and Food Sciences, The University of Queensland , Brisbane, Queensland 4072, Australia.|Department of Food Technology, Faculty of Agriculture & Natural Resources, An Giang University , Long Xuyen, An Giang, Vietnam.
authors.forename: Binh T
authors.initials: BT
authors.lastname: Ho
authors.affiliation: School of Agriculture and Food Sciences, The University of Queensland , Brisbane, Queensland 4072, Australia.
authors.forename: Bhesh R
authors.initials: BR
authors.lastname: Bhandari
mesh_terms: D066241:Carbon-13 Magnetic Resonance Spectroscopy; D005030:Ethylenes / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D014961:X-Ray Diffraction; D047391:alpha-Cyclodextrins / Q000737:chemistry*
chemical_list: D005030:Ethylenes; D047391:alpha-Cyclodextrins; C036216:ethylene; C032613:alpha-cyclodextrin
keywords: amorphous; encapsulation; ethylene; release; α-cyclodextrins