title: Solvent-free microwave extraction coupled with headspace single-drop microextraction of essential oils from flower of Eugenia caryophyllata Thunb.
abstract: Solvent-free microwave extraction coupled with headspace single-drop microextraction was developed for extracting the essential oils from Eugenia caryophyllata Thunb. Carbonyl iron powders were mixed with the sample to extract essential oils from the dried plant materials and single-drop solvent was used to simultaneously extract essential oils from the headspace. The single-drop of decane was suspended from the tip of a microsyringe and exposed to the headspace above the sample. After the extraction was finished, the single-drop was injected into gas chromatographic system and analyzed by GC-MS. The effects of the experimental parameters, including microwave power, microwave irradiation time, the ratio of carbonyl iron powder to sample, extraction solvent, single-drop volume and extraction time, were investigated. Sixteen compounds in the essential oils of E. caryophyllata T. were obtained and identified. The constituents of essential oils obtained by hydro-distillation and solvent-free microwave extraction-headspace single-drop microextraction were not obviously different. Compared with hydro-distillation, the proposed method required shorter extraction time and less amount of the sample.
authors: College of Chemistry, Jilin University, Changchun, P. R. China.
authors: Chunzhu
authors: C
authors: Jiang
authors: Ying
authors: Y
authors: Sun
authors: Xiaonan
authors: X
authors: Zhu
authors: Yan
authors: Y
authors: Gao
authors: Liying
authors: L
authors: Wang
authors: Jian
authors: J
authors: Wang
authors: Liwei
authors: L
authors: Wu
authors: Daqian
authors: D
authors: Song
mesh_terms: D035264:Flowers / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation / Q000379:methods; D008872:Microwaves; D009822:Oils, Volatile / Q000032:analysis*; D012997:Solvents / Q000737:chemistry*; D027842:Syzygium / Q000033:anatomy & histology / Q000737:chemistry*
chemical_list: D009822:Oils, Volatile; D012997:Solvents