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    Home > Qualitative analysis of volatile compounds in lilac

    Qualitative analysis of volatile compounds in lilac

    • Last Update: 2007-01-31
    • Source: Internet
    • Author: User
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    Abstract: by using the methods of GC-MS and gc-ir, and referring to the extraction methods of odor substances at home and abroad, the qualitative analysis of the volatile substances in Syringa was carried out and 11 compounds were identified In addition, it was found that the rich and long fragrance of lilac was related to the presence of alkanes Key words: lilac flower; volatile oil; GC-MS; infrared spectrum; qualitative lilac Syringa oblata series, Syringa Syringa, a deciduous shrub, widely distributed in Liaoning, Jilin, Heilongjiang, Shandong, Shanxi, Inner Mongolia and other places in China, with grayish brown bark, yellowish brown twigs, pubescence at first and no hair later The young leaves are clustered, then opposite, ovate, obovate or lanceolate, the flowering period is from May to June, and the fruit ripens in September It is distributed under the hillside forest or beside the stream or at the edge of the forest at an altitude of 1200-1600m It likes the sun, the soil is wet and the drainage is good Artificial cultivation can also grow well at an altitude of about 350m Lilac flower has always been an important fragrant material Its flowers and leaves have strong fragrance and contain volatile oil In order to further study its value, the author used the headspace adsorption method to extract the essential oil of lilac flower, and analyzed the composition of the volatile substances in lilac flower by GC-MS and IR, so as to make better use of lilac resources 1 The extraction method of lilac flower fragrance: collect 250g lilac flower buds in full bloom and put them into a 2500ml lower mouth bottle, use the headspace adsorption method to adsorb for 1min, and then use a self-made reflux device to elute the adsorption tube with 10ml dichloromethane After adsorption, elution and extraction are carried out in the cable extraction device Take off the adsorbent tube, put the adsorbent tube into the self-made condenser tube, and then pour 10ml of dichloromethane solvent into the top of the condenser tube, so that the solvent flowing from the condenser tube directly drops into the adsorption tube for rinsing, constant temperature water bath, the temperature is controlled between 50 ~ 60 ℃, reflux extraction for 30min, the adsorbed aromatic substances in the adsorption tube can be washed out, and the fragrance containing Ding Xiangfang can be obtained A solvent for flavoring organic ingredients The eluate was transferred to the centrifuge tube and purged with high-purity nitrogen in the ventilation kitchen, and concentrated to 0.2-0.5ml 2 Chemical analysis 2.1 the instrument conditions are q-mass910 gas mass spectrometer and magna560e S.P infrared spectrometer Chromatographic conditions: quartz capillary column 25m, diameter 0.25mm; stationary phase: OV-101; column starting temperature 60 ℃, programmed temperature 5 ℃ / min to 160 ℃ for 30min; injection temperature 250 ℃; carrier gas: nitrogen, 50ml / min; detection port: FID detector injection volume 2 μ L Mass spectrometry conditions: ionization mode EI, electron energy 70ev, ion source temperature 230 ℃, scanning range 30-500 mass spectrometer mass units 2.2 the analysis of the components of the fragrant odorant of clove by chromatography and mass spectrometry, it is confirmed that there are 11 kinds of fragrant odorant: spiro - (3,3) heptyl-1,5-diene, 3-octanol, xylene, platyclonene, benzaldehyde, 4-diene, 3-diene, n-undecanone, β - isohubo-hol, n-tridecane, β - terpineol The main components are 11 kinds Results the mass spectrometry was not very ideal, and the mass spectra of 8 and 10 could not be used to identify the above peaks Therefore, the typical Syringa was further identified by infrared spectrometer By GC-FTIR analysis, the molecular weight of No 10 sample 184 is n-tridecane, and that of No 8 sample 158 is n-undecanone The matching degree between the FTIR spectrum of peak 10 and the standard spectrum of tridecane is 97.583 Spectrum analysis: 2932 / cm and 2863 / cm are the absorption peaks of saturated C-H stretching vibration; 1464 / cm is the absorption peaks of C-H bending vibration on methylene CH2; 1368 / cm is the absorption peaks of C-H bending vibration on methyl CH3; 722 / cm is the structural characteristics of straight linked alkanes formed by multiple CH2 linear connections Spectral analysis conclusion: the results support the structure of straight chain alkanes The matching degree of FTIR and undecanone standard spectra of peak 8 is 95.613 Spectrum analysis: 2932 / cm and 2862 / cm are the absorption peaks of saturated C-H stretching vibration; 1464 / cm is the absorption peaks of C-H bending vibration on methylene CH2; 1353 / cm is the absorption peaks of C-H bending vibration on methyl CH3; 710 / cm is the structural characteristics of straight linked alkanes formed by multiple CH2 linear connections Spectral analysis conclusion: the results support the structure of straight chain alkanes The strong and long fragrance of lilac is just related to the existence of alkanes Reference 1 Zhang Meizhen, Chen Xinlu, a study on Syringa in China Investigation and study, 1990 (10): 32-40 2 Hui Ruihua, Li tiechun, Hou Dongyan Analysis of volatile chemical components in Syringa flowers and leaves by GC / MS, Acta mass spectrometry, 2002, 23 (4): 210-213
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