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

Binh T Ho; Daryl C Joyce; Bhesh R Bhandari

doi:10.1016/j.foodchem.2011.04.035

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

Food Chem. 2011 Nov 15;129(2):259-266. doi: 10.1016/j.foodchem.2011.04.035. Epub 2011 Apr 20.

Authors

Binh T Ho¹, Daryl C Joyce², Bhesh R Bhandari³

Affiliations

¹ School of Agriculture and Food Sciences, The University of Queensland, QLD 4072, Australia.
² School of Agriculture and Food Sciences, The University of Queensland, QLD 4072, Australia; Agri-Science Queensland, Department of Employment, Economic Development and Innovation, P.O. Box 5083, SCMC, Nambour, QLD 4560, Australia.
³ School of Agriculture and Food Sciences, The University of Queensland, QLD 4072, Australia. Electronic address: b.bhandari@uq.edu.au.

PMID: 30634224
DOI: 10.1016/j.foodchem.2011.04.035

Abstract

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 (E_a) and half-life release of ethylene gas were also analysed.

Keywords: Controlled release; Ethylene gas; Inclusion complexes; Release kinetics.