Preparation and properties of walnut oil microcapsules
Pengfei Cui, Junjun Zhou, Xiao Xiao, Bing Qi, Siting Li, Chen Zhou, Yingmin Jia, Aijin Ma
Abstract
This study uses spray drying to prepare walnut oil (WO) microcapsules with microcrystalline cellulose (MCC) and β-cyclodextrin (β-CD) to mitigate the oxidation of WO and prepare for further applications of the microcapsules. The successful encapsulation of WO was confirmed through analysis with a scanning electron microscope (SEM), fourier-transformed infrared spectrometer (FTIR), and x-ray diffraction (XRD), achieving an encapsulation efficiency (EE) of 80.54% and a loading capacity (LC) of 53.87%, with interactions or non-covalent bonds between WO and the wall materials. The powder has an average particle size of 1553.17 nm, 2.85% moisture, 90.62% solubility, and good flowability. After a 7-day accelerated test at 60°C, the microcapsules showed a PV of 4.02 meq/kg and AV of 0.63 mg/g, lower than the walnut oil's PV of 5.35 meq/kg and AV of 0.81 mg/g. The results indicate that the microcapsules have good properties and a reduced degree of oxidation compared to WO.