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Release kinetics of ethylene gas from ethylene-α-cyclodextrin inclusion complexes

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Ho, B. T., Joyce, D. C. and Bhandari, B. R. (2011) Release kinetics of ethylene gas from ethylene-α-cyclodextrin inclusion complexes. Food Chemistry, 129 (2). pp. 259-266.

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Article Link: http://doi.org/10.1016/j.foodchem.2011.04.035


Ethylene was included into α-cyclodextrin (α-CD) by molecular encapsulation. Characterisation of the ethylene-α-CD inclusion complexes (ICs) using X-ray diffractometry (XRD) and scanning electron microscopy (SEM) confirmed their crystalline structures. Release kinetics of ethylene gas from the ICs was investigated. Release characteristics experiments were carried out at various relative humidities (RH) (52.9%, 75.5%, and 93.6%) and temperatures (45, 65, 85, and 105 °C). The Power Law and Avrami's equations were used to analyse release kinetics. The latter showed better fit for ethylene release. Kinetics analysis based on Avrami's equation showed that the release of ethylene was accelerated by increases in RH and temperature. For humidity treatments, the release parameter n represented a diffusive mechanism at 52.9% and 75.5% RH and a first-order mode at 93.6% RH. However, a diffusive mechanism was found in all temperature experiments. Release rate constants increased as a function of increasing temperature. Temperature coefficient (Q10), activation energy (Ea) and half-life release of ethylene gas were also analysed. © 2011 Elsevier Ltd. All rights reserved.

Item Type:Article
Keywords:Controlled release Ethylene gas Inclusion complexes Release kinetics Characterisation Crystalline structure Diffusive mechanisms First-order Inclusion complex Kinetics analysis Molecular encapsulation Power law Relative humidities Release characteristics Temperature coefficient Activation energy Atmospheric humidity Experiments Kinetics Rate constants Scanning electron microscopy X ray diffraction analysis Ethylene alpha cyclodextrin derivative ethylene alpha cyclodextrin unclassified drug article carbon nuclear magnetic resonance complex formation crystal structure diffusion encapsulation energy gas humidity temperature X ray diffraction
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