Comparison of ohmic-assisted hydrodistillation with traditional hydrodistillation for the extraction of essential oils from Thymus vulgaris L.

Gavahian, Mohsen; Farahnaky, Asgar; Javidnia, Katayoun; Majzoobi, Mahsa

doi:10.1016/j.ifset.2012.01.002

Cited by 158 publications

(97 citation statements)

References 29 publications

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“…Thus, heat penetration into the materials and other areas could occur rapidly. This agreed with Fourier's Law, whereby a high local temperature gradient and a small particle dimension result in a high local heat flux (Parrott 1992;Gahavian et al 2012).…”

Section: Scanning Electron Microscopy (Sem) Analysissupporting

confidence: 81%

“…To date, few reports are available in the literature regarding the kinetics of ohmicheated hydro-distillation (Gahavian et al 2011(Gahavian et al , 2012, and there is no report concerning which model could be used to verify the reaction kinetics of ohmic-heated hydro-distillation. Hence, a second-order mechanism was assumed to be a plausible model for the kinetics of ohmic-heated hydro-distillation, as well as hydro-distillation and steam distillation.…”

Section: Proposed Kinetic Modelmentioning

confidence: 99%

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Comparison of Citronella Oil Extraction Methods from Cymbopogon nardus Grass by Ohmic-heated Hydro-distillation, Hydro-Distillation, and Steam Distillation

Hamzah¹,

Man²,

Abidin³

et al. 2013

BioResources

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A proposed method for citronella oil extraction was developed with the application of ohmic heated hydro-distillation. The objective was to compare the performance of three different extraction methods, viz. ohmic heated hydro-distillation, hydro-distillation, and steam distillation. The maximum amount of extracted oil yield by ohmic heated hydrodistillation was 7.64 mL/kWh as compared to hydro-distillation and steam distillation methods that resulted oil yields of 3.87 mL/kWh and 1.69 mL/kWh, respectively. The kinetics of extraction followed a second-order model. Gas chromatography-mass spectrometry analysis found that the major constituents of citronella oil (GC-MS) for the different extraction methods were citronellal, citronellol, and geraniol. Scanning electron microscopy (SEM) of citronella grass provided evidence that the lignocellulosic sources of the extracted citronella oil were schizogenous cavities and cellular lignin. The citronella that had undergone ohmicheated hydro-distillation and steam distillation showed some microfractures and less cell wall degradation than hydro-distillation. The cell walls were less rigid using ohmic-heated hydro-distillation compared to steam distillation. However, the cell walls of the hydro-distillation sample were less dense and exhibited pronounced swelling, but did not show any microfractures.

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Section: Scanning Electron Microscopy (Sem) Analysissupporting

confidence: 81%

Section: Proposed Kinetic Modelmentioning

confidence: 99%

Comparison of Citronella Oil Extraction Methods from Cymbopogon nardus Grass by Ohmic-heated Hydro-distillation, Hydro-Distillation, and Steam Distillation

Hamzah¹,

Man²,

Abidin³

et al. 2013

BioResources

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show abstract

“…Studies on some Thymus species indicated that in the plant's life cycle, the oil production is usually at its highest level during the flowering period [3]. This is in agreement with our results which show that plants harvested during the flowering stage contained more concentrated compounds.…”

Section: Effect Of Growth Stage On the Chemical Composition Of Thymussupporting

confidence: 93%

“…A same relative percentage of EOs present in T. algeriensis (from Algeria) was obtained by Dob et al [13] with 1.13%. Generally, the results found in our present study are very similar to those reported in literature with some few exceptions probably dues to some ecological and climatic conditions (temperature, location, soil type and harvest time) and some laboratory operating conditions (drying time, extraction and analytical techniques) [3].…”

Section: Thymus Species Content In Eossupporting

confidence: 91%

“…The different species are distributed along the cost and even in the intern and arid areas. In the North Africa countries (Algeria, Tunisia and Morocco), thyme leaves extracts, despite their frequent use as a spice and infusions, are used in traditional medicine as astringent, expectorant, antiseptic, antirheumatic, diuretic, analgesic and cicatrizing agents, as reported in several studies [1,[3][4][5]. Thyme can also be used as a veterinary product (antispasmodic, antiseptic and digestive); it is applied as feed additives and for treating diseases for pets and farm animals [6].…”

Section: Introductionmentioning

confidence: 99%

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Phytochemical Characterization of the Essential Oils Obtained from Mediterranean Thymus spp. (Lamiacea) Harvested at Different Stages of Growth

Touhami¹,

Chefrour²,

Khellaf³

et al. 2017

JPP

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Abstract:To prove more information on the chemical composition of the essential oils of Thymus taxa collected in different Algeria areas, and to determine the effect of harvesting periods on the composition of these essential oils: three Thymus species (T. numidicus, T.ciliatus and T. algeriensis) were collected during two periods of development, the EOs (essential oils) obtained by steam distillation of the aerial parts were analyzed by GC/MS (gas chromatography coupled with mass spectrometry). During the pre-flowering stage, the RP% (relative percentage) of Eos varied between 1.00% and 1.34% for all the species. The content of EOs increased during the flowering stage and reached particularly 2.10% and 2.85% for T. numidicus (from Berrahal) and T. numidicus (from Tacha), respectively. GC/MS analysis showed that these oils are very rich in oxygenated monoterpenes group (76.96%~82.11%) when the plants were harvested during the flowering stage of growth. Thymol was the major compound in the EOs contained in T. numidicus (Berrahal) and T. ciliatus with more than 39% and 54%, respectively. Thymus numidicus (Tacha) and T. algeriensis EOs were characterized by high content in p-cimene-7-ol (78.06% and 26.98%, respectively). These two chemotypes (thymol and p-cimene-7-ol) are considered as antioxidant and antimicrobial agents providing the basis for many applications in processed food preservation and pharmaceutical products.

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Extraction Methods of Essential Oils From Herbs and Spices

Roohinejad

Koubàa

Barba

et al. 2017

Essential Oils in Food Processing

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Comparison of ohmic-assisted hydrodistillation with traditional hydrodistillation for the extraction of essential oils from Thymus vulgaris L.

Cited by 158 publications

References 29 publications

Comparison of Citronella Oil Extraction Methods from Cymbopogon nardus Grass by Ohmic-heated Hydro-distillation, Hydro-Distillation, and Steam Distillation

Comparison of Citronella Oil Extraction Methods from Cymbopogon nardus Grass by Ohmic-heated Hydro-distillation, Hydro-Distillation, and Steam Distillation

Phytochemical Characterization of the Essential Oils Obtained from Mediterranean Thymus spp. (Lamiacea) Harvested at Different Stages of Growth

Extraction Methods of Essential Oils From Herbs and Spices

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