Microencapsulation of Calamansi (Citrus Microcarpa) Essential Oil onto β-Cyclodextrin for Cotton Fabric Application
Received Date: April 01, 2020; Published Date: July 31, 2020
Microencapsulation in textiles is a cost effective and long-lasting method in storing volatile substances over a long period of time which can be used for several applications such as antimicrobial textiles.
In this study, coprecipitation method was used for the microencapsulation of calamansi essential oil (guest molecule) in β-cyclodextrin (wall material) using 1,2,3,4-butanetetracarboxylic acid as crosslinker. The microcapsules were characterized using Scanning Electron Microscopy (SEM) and Fourier Transform Spectroscopy (FTIR), and Differential Scanning Calorimetry (DSC) before incorporated onto the scour-bleached cotton fabric using pad-dry-cure method. The developed cotton fabrics were further characterized using SEM and FTIR.
The mass ratio of 3:1 (β-cyclodextrin to oil) with constant stirring time of 8 hours obtained the highest microencapsulation yield of 72.03%. SEM micrographs revealed that the synthesized microcapsules were tiny cube- liked in structure. The FTIR spectra of the microcapsule showed similar peaks with β-cyclodextrin and no peaks similar with the calamansi oil, indicating the successful encapsulation of the guest molecule with the wall material. The DSC thermograms further showed evidence for the encapsulation. The successful incorporation of the microcapsules onto the cotton fabric was evidenced in the SEM micrographs while FTIR confirmed the crosslinking through butane tetracarboxylic acid with a peak at 1714 cm-1 that did not appear on the untreated fabric. This showed an ester carbonyl bond that may have formed between the fabric and microcapsule.
Keywords: Microencapsulation; Microcapsule; Cotton fabric; Calamansi essential oil; β-cyclodextrin