Comparison of aroma profiles of essential oils extracted by hydro-distillation from orange peel waste dried by various methods
2021
Aşkin, Buket
Effects of oven-drying at 45 °C (OD45), oven-drying at 55 °C (OD55) and microwave-drying at 400 W, 560 W and 700 W (MW400, MW560, MW700) on the content of essential oil extracted using hydro-distillation were studied. To get the highest quality and quantity of essential oil, it is necessary to know the suitable methods for drying. The highest concentration of phenolic compounds was determined by UV-spectrophotometryfor OD45, MW400 and MW560, respectively. The highest essential oil yield that was obtained from OD55 samples and the lowest from MW700. Thirty-two components were identified by gas chromatography-mass spectrometry in essential oil samples, mostly oxygenated monoterpenes and hydrocarbon monoterpenes. The main components were limonene (87.4–90.7 %), β-linalool (2.0–3.7 %), β-pinene (1.7–1.8 %), n-octanal (1.0–1.2 %), α-terpineol (0.4–0.7 %) and n-decanal (0.5–0.7 %). The most important changes were remarkable in MW400. It was observed that some components such as 1-nonanol, β-citral, E-2-decanol or o-hydroxybiphenyl, which were negligible in oils obtained from fresh peels, showed a significant increase in oils obtained from MW400.
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