Abstract
The purpose of the research was to measure the increase in the binding of inclusion complexes β-cyclodextrin-peppermint oil (β-CD_PM) to cellulose in cotton and cotton/polyester material with BTCA as the crosslinking agent by applying an ultrasonic bath at room temperature and a frequency of 80 kHz for 10 min. After sonication, the samples were left in a bath for 24 h after which they were dried, thermocondensed and subjected to a number of wash cycles. The treated samples were analysed with Attenuated total reflection (ATR) units heated up to 300 °C (Golden Gate (FTIR-ATR)) to monitor chemical changes indicative of crosslinking, while physico-chemical changes in the samples were monitored by using Fourier transform infrared spectroscopy (FTIR-ATR). Mechanical properties were measured according to EN ISO 13934-1:1999, and coloristic changes were evaluated by the whiteness degree according to CIE (WCIE) and the yellowing index (YI), while antimicrobial activity was determined according to AATCC TM 147-2016. The results show a physico-chemical modification of the UZV-treated cellulosic material. Moreover, partial antimicrobial efficacy on Gram-negative bacteria was confirmed for treated fabrics.
Highlights
Cyclodextrins are cyclic oligosaccharides consisting of (α-1,4)-linked α-D-glucopyranose units with a hydrophilic outer surface and a lipophilic central cavity
It is evident from the above that various active substances such as fragrances, drugs, fungicides or bactericidal agents can be incorporated into the cyclodextrin molecule in such a manner that they form inclusion complexes
The high temperature Fourier transform of infrared spectra (FTIR)-Attenuated total reflection (ATR) Golden Gate unit was used to monitor physicochemical changes within the treated sample at 150 ◦C for 5 min to determine the influence of temperature and time on the crosslinking process of the inclusion complex β-CD-peppermint oil (PM) and cellulose
Summary
Cyclodextrins are cyclic oligosaccharides consisting of (α-1,4)-linked α-D-glucopyranose units with a hydrophilic outer surface and a lipophilic central cavity. The hydroxyl groups of glucopyranose units are oriented to the exterior of the molecule, giving it a hydrophilic character [1,2,3]. Due to such structure, cyclodextrins can form inclusion complexes by encapsulating a significant number of molecules of suitable size in their central cavities, either partially or entirely. Cyclodextrins behave as empty capsules (“hosts”) that can incorporate non-polar substances in their lipophilic cavity to form inclusion complexes. The complexing agent is gradually released from cyclodextrin cavities [3,4,5]
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