Impregnation of cotton fabric with pyrethrum extract in supercritical carbon dioxide

• Published in: The Journal of supercritical fluids 2017-10, Vol.128, p.66-72
• Main Authors: Pajnik, Jelena, Stamenić, Marko, Radetić, Maja, Tomanović, Snežana, Sukara, Ratko, Mihaljica, Darko, Zizovic, Irena
• Format: Article
• Language: English
• Subjects: Pyrethrin; Pyrethrum extract; Solubility; Supercritical carbon dioxide; Supercritical solvent impregnation; Tick repellent activity
• ISSN: 0896-8446; 1872-8162
• DOI: 10.1016/j.supflu.2017.05.006

[Display omitted] •SSI was feasible in impregnation of cotton fabric with pyrethrum extract.•Solubility determination revealed high solubility of pyrethrum extract in scCO2.•Target contents of impregnated extract were achieved after 1h and 2h at 8MPa.•Impregnated cotton fabrics efficiently repelled the ticks. This study discusses a possibility of cotton fabric impregnation with pyrethrum extract as a tick repellent in supercritical carbon dioxide. A solubility of pyrethrum extract in supercritical carbon dioxide has been determined at 35 and 40°C and pressures ranging from 8 to 20MPa. The highest solubility of 48.69kg/m3 was obtained at temperature of 35°C and pressure of 20MPa. Density-based equations of Chrastil, Adachi-Lu and del Valle-Aguilera were employed to correlate the experimental data. Based on the solubility data, conditions for the impregnation of cotton fabric were selected. Conditions at 40°C and 8MPa provided targeted quantities of the impregnated extract of 0.5% and 1% after 1h and 2h of the impregnation, respectively. The presence of pyrethrins on the cotton fabric’s surface was confirmed by FTIR analysis. Repellent activity of both impregnated cotton fabrics (pyrethrum extract contents of 0.5% and 1%) was proven against ticks.