Analysis of the Composition of Essential Oils from Four Citrus Peels
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Abstract:
This study provides a theoretical basis for comprehensive development and utilization of citrus volatile oils through examining the volatile oil composition. The volatile oils were extracted via Supercritical Fluid Extraction (SFE)-CO2 from satsuma, lemon, navel orange, ponkan for the analysis by GC-MS. The final oil yields for citrus, lemon, navel orange and ponkan were 0.620%, 0.556%, 0.593% and 0.742%, respectively. The results showed that 39, 33, 37 and 31 volatile compounds, respectively, were found in four types of volatile oils, and they were mainly terpenes, alcohols, aldehydes, esters, ketones, and phenolics (among which terpenes, alcohols, aldehydes had higher contents). While the volatile oils of four citrus peels had their own distinct components, they all contained D-limonene, β-elemene, citronellol, elemol, sunflower aldehyde, (E,E,E)-2,6,10-trimethyl-2,6,9,11-dodecatetraenal, etc. It was concluded that these common compound and unique components represent one of the factors influencing the quality of citrus. The use of retention indices to distinguish the isomers could improve the accuracy of a qualitative compositional analysis for natural fragrance materials.
