A new and effective high performance liquid chromatography (HPLC) method was developed for fast quantification of phenylethyl alcohol in rose water. Chemical profiles of rose water and oil of Rosa damascena and Rosa rugosa from Southeast China were investigated by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). Fast HPLC was achieved by rapid sample preparation and fast elution using acetonitrile-water (35:65, v/v) on Zorbax SB-C18. It was validated and applied to rapid analysis of different rose water samples, in which the contents of phenylethyl alcohol ranged from 454.6 to 526.7 μg/mL. GC and GC-MS revealed that rose water volatiles of R. damascena and R. rugosa mainly consisted of phenylethyl alcohol (90.2% and 78.7%, respectively) and citronellol (4.5% and 13.5%, respectively). This is the first report on fast HPLC quantification of phenylethyl alcohol in rose water and chemical profiles of rose water volatiles of R. damascena and R. rugosa from Southeast China. The developed HPLC method can serve as a fast quality control during rose water production.

Both 1 : 1 and 2 : 1 Pd–C9-BTBP complexes were found in solution by 1H NMR titration.

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BACKGROUND: Aromatic waste water is the main by-product of industrial essential oil distillation. To recover the dissolved essential oil from this distillation waste water, an approach combining column adsorption (CA) and supercritical fluid extraction (SFE) was proposed. Yulania liliiflora was selected as a case study. Activated carbon of mixed porosity was employed and quantitative desorption of the adsorbed oil was achieved using supercritical carbon dioxide (SC-CO 2 ). RESULTS:The optimized condition of CA-SFE was 18 MPa, 308 K, dynamic extraction for 60 min and CO 2 flow rate of 3.6 g min −1 . A recovery of 0.668 ± 0.050 g kg −1 (n = 3) was achieved for the dissolved oil from distillation waste water, significantly higher (P < 0.05) than that obtained by liquid-liquid extraction (LLE) (0.405 ± 0.032 g kg −1 , n = 3). Yulania liliiflora recovered oil was rich in eucalyptol (52. 6-55.2%), -terpineol (15.2-18.1%) and terpinen-4-ol (8.1-8.7%). CONCLUSION:The CA-SFE approach is highly efficient and especially suitable for large-scale application. The recovered essential oil is valued for being rich in organoleptically important and biologically active compounds.

Essential oils and hydrosols from fresh flowers of Cerasus subhirtella (Miq.) Sok. and Cerasusserrulata (Lindl.) London from East China were analysed by gas chromatography and gas chromatography-mass spectrometry for the first time. The major components of the essential oils from C. subhirtella and C.serrulata were benzaldehyde (31.2% and 42.1%, respectively), tricosane (23.1% and 27.7%, respectively) and pentacosane (23.2% and 19.0%, respectively). The main constituents of the hydrosol volatiles from C. subhirtella and C.serrulata were benzaldehyde (67.5% and 64.3%, respectively) and mandelonitrile (12.5% and 12.4%, respectively). Benzaldehyde was the key component of the essential oils, while benzaldehyde as well as mandelonitrile was the principal compound of the hydrosols.