Abstract
Galbanum essential oil (EO) and its components have a wide industrial use based on constituents. In this regard, developing a feasible method for obtaining fractions containing different compositions with specific properties can be more beneficial than using the raw EO. Here, galbanum EO was extracted using hydrodistillation method which yielded 21.52%, containing α-pinene (3.26%), β-pinene (72.79%), β-myrcene (2.37%), α-phellandrene (0.87%), copaene (0.92%), and azulene (0.85%) detected using GC-MS and GC-FID. The influence of three operational parameters including distillation periods, reflux ratio, and reboiler heat on the purity of the resultant fractions was explored. Firstly, time-dependent fractional distillation of the extracted EO was conducted and fractions with different contents of each component were collected. The maximum mass fractions of aforementioned components were 9.18%, 89.12%, 3.14%, 1.18%, 1.45%, and 2.73% (wt.%), respectively. Secondly, utilization of the reflux ratio (5:1) had no substantial effect on the purity of the components whereas it resulted in additional time and energy consumption. Finally, decreasing the heat of the reboiler to 75% of its baseline value and subsequently enhancing the contact time of the phases along the column significantly boosted the purity of α-pinene and β-pinene, achieving 24.52% (wt.%) and 92.38% (wt.%), respectively. There was no evidence of thermal degradation in any of the experiments, notwithstanding considerable thermal sensitivity of the EO. These findings indicate that fractional distillation can be an effective approach in achieving fractions that are richer in desired components in galbanum EO.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by FN, FPR, and MRM. The first draft of the manuscript was written by FN, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Highlights
• Galbanum essential oil was extracted using hydrodistillation with yield of 21.52%.
• Desired compound-rich fractions were achieved through time-dependent fractionation.
• Applying reflux ratio (5:1) only results in consuming more time and energy.
• Reducing reboiler heat leads to achieving fractions richer in volatile components.
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Nasiri, F., Roudsari, F.P. & Mehrnia, M.R. Low-temperature fractional distillation for facile enrichment of intact aromatic components from galbanum essential oil. Biomass Conv. Bioref. (2023). https://doi.org/10.1007/s13399-023-05089-6
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DOI: https://doi.org/10.1007/s13399-023-05089-6