Comparing Two Kinds of Methods for Extraction of Volatile Oils from Orange Peel and Components Analysis by GC-MS

[Objective] To compare different extraction method for volatile oil from orange peel.[Method] The volatile oils were extracted from orange peel by steam distillation(SD) and ultrasound-assisted steam distillation(UESD),respectively.The chemical constituents in the volatile oils were identified by Gas Chromatography-Mass Spectrometry GC-MS and their relative contents were calculated based on GC peak areas.[Result] For steam distillation,21 compounds of 30 detected peaks were identified,accounting for 93.89% of the volatile fraction.The main components were dimethyl phthalate(51.93%);For ultrasound-assisted steam distillation,38 compounds of 45 detected peaks were identified,accounting for 98.07% of the volatile fraction.The main components were D-Limonene.[Conclusion] The results indicated that,there is a significant difference in the composition and relative amounts between the volatile oils obtained by SD and UESD methods;the common components of the two extracts were organic acids and alkanes.SD method allows higher amount of organic acids than UESD.