Journal
JOURNAL OF ESSENTIAL OIL RESEARCH
Volume 29, Issue 6, Pages 471-480Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10412905.2017.1360216
Keywords
Ginger essential oil; microwave assisted extraction; solvent-free; GC
Categories
Funding
- Sectorial Operational Program for Human Resources Development [PERFORM/159/1.5/S/138963]
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A solvent free in situ microwave hydro-distillation method for extraction of essential oil from fresh ginger root it presented. Extraction was conducted in a TE10n single-mode microwave cavity and variable power 2 kW generator operating at 2.45GHz. The main extracted components identified by gas chromatography (GC) were Zingiberene, -Curcumene, -Sesquiphellandrene and -Selinene. At energy inputs of 0.40 kWh/kg higher powers and shorter exposure times, crucially did not degrade the highly volatile components (-Pinene and Camphene) despite providing the highest essential oil yields. Optimum processing conditions were found to be 1000W (0.40kWh/kg) for 5 min, for whole ginger root, where 0.35g oil/100g plant was obtained. This was compared to a yield of 0.2g/100g plant in 150 in using conventional hydro-distillation and 0.3g/100g plant in 90 min using a multi-mode microwave cavity-based hydro-distillation.
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