scholarly journals Chemical Profile and Use of the Peat as an Adsorbent for Extraction of Volatile Compounds from Leaves of Geranium (Pelargonium graveolens L’ Herit)

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4923
Author(s):  
Edenilson dos Santos Niculau ◽  
Péricles Barreto Alves ◽  
Paulo Cesar de Lima Nogueira ◽  
Luciane Pimenta Cruz Romão ◽  
Graziele da Costa Cunha ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Extraction Method ◽  
Gas Chromatography Mass Spectrometry ◽  
Dynamic Headspace ◽  
Chemical Profile ◽  
Porapak Q ◽  
Pelargonium Graveolens ◽  
Flame Ionization ◽  
Volatile Organic ◽  
First Time

Volatile organic compounds (VOCs) from leaves of geranium (Pelargonium graveolens L’ Herit) were extracted by dynamic headspace using Porapak Q (HSD-P) as adsorbent and peat, a novel adsorbent in the extraction of plant volatiles, analyzed by gas chromatography–mass spectrometry (GC/MS) and gas chromatography–flame ionization (GC/FID), and the results were compared with those obtained by hydrodistillation (HD). The yield volatiles changed with the extraction method. HD was more efficient for extracting linalool (11.19%) and citronellyl formate (9.41%). Citronellol (28.06%), geraniol (38.26%) and 6,9-guaiadiene (9.55%) and geranyl tiglate (8.21%) were the major components identified by dynamic headspace using peat (HSD-T), while citronellol (16.88%), geraniol (13.63%), 6,9-guaiadiene (16.98%) and citronellyl formate (6.95%) were identified by dynamic headspace using Porapak Q (HSD-P). Furthermore, this work showed, for the first time, that in natura peat is useful to extract VOCs from leaves of geranium.

Diffusion and adsorption of benzene in Regina clay

1999 ◽  
Vol 36 (3) ◽  
pp. 430-442 ◽  
Author(s):  
Robert B Donahue ◽  
S Lee Barbour ◽  
John V Headley
Keyword(s):  
Gas Chromatography ◽  
Organic Carbon ◽  
Effective Diffusion ◽  
Gas Chromatography Mass Spectrometry ◽  
Organic Carbon Content ◽  
Flame Ionization ◽  
Batch Tests ◽  
Volatile Organic ◽  
Volatile Organic Chemicals ◽  
Low Levels

The diffusion and adsorption coefficients for benzene were measured for a glaciolacustrine clay using the single- and double-reservoir methods, batch tests, and organic carbon content correlations. Single- and double-reservoir diffusion test cells and experimental procedures were specifically developed for volatile organic chemicals. Analytical methods based on solvent extraction with gas chromatography - flame ionization detection and purge and trap gas chromatography - mass spectrometry were used for the analysis of aqueous benzene solutions in the 0.5 µg/L to 500 mg/L range. The measured effective diffusion coefficient was 0.01 m2/a (3.2 × 10-6 cm2/s), and adsorption coefficients ranged from 0.1 to 1.0 mL/g. The diffusion cell tests indicate relatively low levels of retardation for benzene as it moves in clay soils with low organic carbon content.Key words: adsorption, diffusion, benzene, Regina clay.

scholarly journals Application of dynamic headspace and gas chromatography coupled to mass spectrometry (DHS-GC-MS) for the determination of oxygenated volatile organic compounds in refinery effluents

2016 ◽  
Vol 8 (17) ◽  
pp. 3570-3577 ◽  
Author(s):  
Grzegorz Boczkaj ◽  
Patrycja Makoś ◽  
Andrzej Przyjazny
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Chromatography Mass Spectrometry ◽  
Dynamic Headspace ◽  
Petroleum Asphalt ◽  
Oxygenated Volatile Organic Compounds ◽  
Volatile Organic

The paper presents a new procedure for the determination of oxygenated volatile organic compounds in postoxidative effluents from the production of petroleum asphalt using dynamic headspace coupled to gas chromatography-mass spectrometry in SIM mode.

scholarly journals A Novel Chemical Profile of a Selective In Vitro Cholinergic Essential Oil from Clinopodium taxifolium (Kunth) Govaerts (Lamiaceae), a Native Andean Species of Ecuador

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 45
Author(s):  
Sandra Espinosa ◽  
Nicole Bec ◽  
Christian Larroque ◽  
Jorge Ramírez ◽  
Barbara Sgorbini ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Essential Oil ◽  
Positive Control ◽  
Gas Chromatography Mass Spectrometry ◽  
Chemical Profile ◽  
Flame Ionization ◽  
Aerial Parts ◽  
Germacrene D ◽  
Enantioselective Gc

A novel chemical profile essential oil, distilled from the aerial parts of Clinopodium taxifolium (Kunth) Govaerts (Lamiaceae), was analysed by Gas Chromatography-Mass Spectrometry (GC-MS, qualitative analysis) and Gas Chromatography with Flame Ionization Detector (GC-FID, quantitative analysis), with both polar and non-polar stationary phase columns. The chemical composition mostly consisted of sesquiterpenes and sesquiterpenoids (>70%), the main ones being (E)-β-caryophyllene (17.8%), α-copaene (10.5%), β-bourbonene (9.9%), δ-cadinene (6.6%), cis-cadina-1(6),4-diene (6.4%) and germacrene D (4.9%), with the non-polar column. The essential oil was then submitted to enantioselective GC analysis, with a diethyl-tert-butyldimethylsilyl-β-cyclodextrin diluted in PS-086 chiral selector, resulting in the following enantiomeric excesses for the chiral components: (1R,5S)-(−)-α-thujene (67.8%), (1R,5R)-(+)-α-pinene (85.5%), (1S,5S)-(−)-β-pinene (90.0%), (1S,5S)-(−)-sabinene (12.3%), (S)-(−)-limonene (88.1%), (S)-(+)-linalool (32.7%), (R)-(−)-terpinen-4-ol (9.3%), (S)-(−)-α-terpineol (71.2%) and (S)-(−)-germacrene D (89.0%). The inhibition activity against acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) of C. taxifolium essential oil was then tested, resulting in selective activity against BChE with an IC50 value of 31.3 ± 3.0 μg/mL (positive control: donepezil, IC50 = 3.6 μg/mL).

scholarly journals Composition and Antimicrobial Activity of Essential Oils from Leaves and Twigs of Magnolia hookeri var. longirostrata D.X.Li & R. Z. Zhou and Magnolia insignis Wall. in Ha Giang Province of Vietnam

2021 ◽  
Vol 15 (3) ◽  
pp. 207-212
Author(s):  
Ha Thi Thu Chu ◽  
Thuy Thi Thu Dinh ◽  
Nam Quang Vu ◽  
Tam Kieu Bang Nguyen ◽  
William N. Setzer
Keyword(s):  
Gas Chromatography ◽  
Essential Oils ◽  
Dry Weight ◽  
Gas Chromatography Mass Spectrometry ◽  
Ionization Detector ◽  
Inhibitory Effects ◽  
Flame Ionization ◽  
Leaf Oil ◽  
First Time ◽  
Time Information

The essential oils from leaves and twigs of Magnolia hookeri var. longirostrata D.X.Li & R.Z.Zhou and Magnolia insignis Wall., growing wild in Ha Giang Province of Vietnam, were obtained by hydrodistillation and analyzed by gas chromatography-flame ionization detector (GC-FID) and gas chromatography-mass spectrometry (GC-MS). The respective yields of the M. hookeri var. longirostrata leaf and twig oils were 0.14% and 0.05% (v/w), and of the M. insignis leaf and twig oils were 0.16% and 0.05% (v/w), calculated on a dry weight basis. Major components of the oils of M. hookeri var. longirostrata were: Linalool (21.3%), (E)-nerolidol (12.2%) and neo-intermedeol (13.5%) (leaf oil); 1,8-cineole (13.3%) and linalool (17.1%) (twig oil). Major components of the oils of M. insignis were: Linalool (24.1%), geraniol (14.9%) and (E)-nerolidol (22.5%) (leaf oil); 1,8-cineole (9.5%) and linalool (26.9%) (twig oil). The essential oils from M. insignis showed stronger inhibitory effects on the seven test microorganisms than those from M. hookeri var. longirostrata. Candida albicans and Lactobacillus fermentum were more sensitive to the essential oils than the other tested microorganisms. This is the first time information on essential oils of M. hookeri var. longirostrata leaves and twigs and of M. insignis twigs are reported.

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