Separation and encapsulation of Persian red rose oil by eutectic compounds

• Published in: Microchemical journal 2021-09, Vol.168, p.106458, Article 106458
• Main Authors: Mohammadi, Behrouz, Shekaari, Hemayat, Zafarani-Moattar, Mohammed Taghi
• Format: Article
• Language: English
• Subjects: Deep eutectic solvents (DES); Encapsulation; Green extraction; Red rose oil; β-Phenylethyl alcohol
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2021.106458

•The potential of DESs for β-phenylethyl alcohol (PEA) extraction of was studied.•The composition analysis shows that PEA is the main ingredient of red rose oil.•DESs show good potential for PEA extraction as the green solvents.•The extracted red rose oil was encapsulated in a thermosensitive shell. In this work, the applicability of eco-friendly choline chloride-based deep eutectic solvents (DESs) in the extraction of β-phenylethyl alcohol (PEA) as the main ingredient of red rose oil from Iranian red rose blossoms have been investigated for the first time and the results were compared to the several conventional organic solvents including tetrahydrofuran (THF), n-hexane, cyclohexane, methyl ethyl ketone (MEK) and isobutyl alcohol (iBuOH). The Iranian red rose oil compositions were determined using the gas chromatography (GC) technique. The main compounds of Iranian red rose oil were PEA (63–69%), citronellol (10–11%), geraniol (8–9%), heptadecane (0.5–5%), nerol (4–5%), nonadecane (0.5–2.5%), methyl eugenol (2–3%), eugenol (2.5–3%) and benzyl alcohol (0.9–1.1%). The results indicate that choline chloride:sucrose DES with (1:2) mole ratio performs better in the extraction of PEA than the conventional solvents. The results were confirmed using Hansen solubility parameters (HSP) and the activity coefficient model. The extracted red rose oil was encapsulated for the first time in N-butyl palmitate/stearate (BPS) with a 24.6 °C melting point as the thermosensitive shell. The narrow particle size distribution of the produced nanocapsules of (70–550) nm were found.