Changes in the chemical composition of essential oils during storage

2019 ◽  
pp. 66-75
Author(s):  
I. A. Fedotova ◽  
A. E. Paliy ◽  
O. M. Shevchuk ◽  
S. A. Feskov
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Component Composition ◽  
Volatile Components ◽  
Chemical Transformations ◽  
Duration Of Storage ◽  
Mass Fractions ◽  
Main Component ◽  
Physical And Chemical

During the storage of essential oils, physical and chemical changes occur, leading to changes in the component composition, as a result of which the organoleptic and pharmacological properties of the oils change. The composition of the essential oils of Tagetes minuta L. and Cymbopogon flexuosus (Nees ex Steud.) W. Watson was studied by chromatography-mass spectrometry fresh and after storage. It was found that in T. minuta essential oil after storage for 6 months, the mass fraction of the main component, tagetenone, decreases due to the appearance of products of its oligomerization. Such changes lead to an improvement in the organoleptic properties of the oil. After storing the oil for 24 months, polymer forms of tagetones are formed in it and its viscosity is significantly increased, which makes its further use impossible. When storing C. flexyosus essential oil for 6 months, no changes were found in its chemical composition. After 24 months of storage, the mass fractions of cis and trans citral are reduced and undesirable components appear: isomeric forms of citrals, photocitral and caryophyllene oxide. Unpleasant notes appear in the aroma of the oil, and its quality decreases. Studies show that the chemical transformations of volatile components in essential oils do not always lead to a deterioration in their properties and depend on the species of the plant material and the duration of storage.

scholarly journals Chemical Composition and Antimicrobial Activity of the Essential Oils of Leaves, Roots and Bark of Glossocalyx staudtii

2009 ◽  
Vol 4 (8) ◽  
pp. 1934578X0900400 ◽  
Author(s):  
Huguette Agnaniet ◽  
Thomas Makani ◽  
Raphaël Bikanga ◽  
Louis Clément Obame ◽  
Jacques Lebibi ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Disc Diffusion ◽  
Aliphatic Compounds ◽  
Gram Positive Bacteria ◽  
Agar Disc ◽  
Leaf Oil ◽  
Main Component

The chemical composition of the essential oils obtained by hydrodistillation from air dried leaves, bark and roots of Glossocalyx staudtii Engl. grown in Gabon was analyzed by GC and GC-MS. The essential oil content was 0.84% (w/w), 0.28% (w/w), and 0.74% (w/w), respectively. The leaf oil was characterized by a high content of monoterpene hydrocarbons (64.8%), with β-pinene (30.6%) and α-pinene (22.6%) as the major constituents. The oil obtained from the bark contained 30.5% of oxygenated monoterpenes with cryptone as the main constituent (11.5%) and 28.9% of aliphatic compounds, with 9.3% of 2-tridecanone; in the roots oil, the main component was 2-tridecanone (55.2%). The antimicrobial activity of the oils was studied by means of the agar disc diffusion and broth microdilution methods. The Gram positive bacteria were the most sensitive to the essential oils. A significant anticandidal effect of the bark essential oil was observed.

scholarly journals Eremanthus arboreus (Gardner) MacLeish (Candeeiro): natural source of α-Bisabolol

2020 ◽  
Vol 9 (10) ◽  
pp. e9599109270
Author(s):  
Gledson Ferreira Macedo ◽  
José Weverton Almeida-Bezerra ◽  
Viviane Bezerra da Silva ◽  
Elvis Estilak Lima ◽  
Saulo Almeida de Menezes ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Web Of Science ◽  
Pharmacological Activities ◽  
Homogeneous Composition ◽  
Main Component ◽  
Biological And Pharmacological Activities

There is a growing search in the chemical composition of essential oils, as they have biological and pharmacological activities. Among the plants with homogeneous composition in essential oils stands out the species Eremanthus arboreus (Gardner) MacLeish, (Asteraceae) popularly known as the “candeeiro”. This plant species is native to Chapada of Araripe - Ceará, Brazil. The objective was to characterize chemically the constituents of the essential oil (OE) of E. arboreus by means of Gas Chromatography and perform a review of its biological and pharmacological activities. The botanical material was collected in Chapada of Araripe, Barbalha - CE, Brazil, in April 2014, the extraction and collection of OE was done in Clevenger apparatus. The chemical composition of the OE was performed by Gas Chromatography coupled to Mass Spectrometry (CG/MS). As for the review, specialized scientific bases (Scopus, Scielo and Web of Science) were consulted. According to the results, 8 constituents were identified, where α-Bisabolol is mentioned as being the main component of the essential oil of this species. As for the biological and pharmacological activities of the OE, it was demonstrated that the species has the following activities: antimicrobial, larvicide, anti-inflammatory and antinociceptive. Eremanthus arboreus is a species with great pharmaceutical potential and also an alternative for industries that target products based on the constituent α-Bisabolol.

scholarly journals Essential Oil of Algerian Eryngium campestre: Chemical Variability and Evaluation of Biological Activities

Molecules ◽  
2019 ◽  
Vol 24 (14) ◽  
pp. 2575 ◽  
Author(s):  
Medbouhi ◽  
Benbelaïd ◽  
Djabou ◽  
Beaufay ◽  
Bendahou ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Biological Activities ◽  
In Vitro Study ◽  
Chemical Compositions ◽  
Strong Activity ◽  
Chemical Variability ◽  
Main Component

The chemical composition of essential oils extracted from aerial parts of Eryngium campestre collected in 37 localities from Western Algeria was characterized using GC-FID and GC/MS analyses. Altogether, 52 components, which accounted for 70.1 to 86.8% of the total composition oils were identified. The main compounds were Germacrene D (0.4–53.4%), Campestrolide (1.6–35.3%), Germacrene B (0.2–21.5%), Myrcene (0.1–8.4%), α-Cadinol (0.2–7.6%), Spathulenol (0.1–7.6%), Eudesma-4(15)-7-dien-1-β-ol (0.1–7.6%) and τ-Cadinol (0.3–5.5%). The chemical compositions of essential oils obtained from separate organs and during the complete vegetative cycle of the plant were also studied. With the uncommon 17-membered ring lactone named Campestrolide as the main component, Algerian E. campestre essential oils exhibited a remarkable chemical composition. A study of the chemical variability using statistical analysis allowed the discrimination of two main clusters according to the geographical position of samples. The study contributes to the better understanding of the relationship between the plant and its environment. Moreover, the antimicrobial activity of the essential oil was assessed against twelve strains bacteria and two yeasts involved in foodborne and nosocomial infections using paper disc diffusion and dilution agar assays. The in vitro study demonstrated a strong activity against Gram-positive strains such as S. aureus, B. cereus, and E. faecalis. The cytotoxicity and antiparasitic activities (on Lmm and Tbb) of the collective essential oil and one sample rich in campestrolide, as well as some enriched fractions or fractions containing other terpenic compounds, were also analyzed. Campestrolide seems to be one compound responsible for the cytotoxic and antileishmanial effect, while myrcene or/and trans-β-farnesene have a more selective antitrypanosomal activity.

scholarly journals Impact of Different Storage Conditions on Composition of Lemongrass (Cymbopogon citratus L.) Essential Oil of Tien Giang Province, Vietnam

2020 ◽  
Vol 32 (11) ◽  
pp. 2743-2747
Author(s):  
Thi Kim Ngan Tran ◽  
Tan Phat Dao ◽  
Thi Cam Quyen Ngo ◽  
Thien Hien Tran ◽  
Ung Thanh Dat ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Storage Time ◽  
Physical Stability ◽  
Chemical Properties ◽  
Storage Conditions ◽  
Citronella Oil ◽  
Main Components ◽  
Physical And Chemical

Essential oils are known to be susceptible to changes and degradation that can lead to loss of quality and pharmacological properties. In this work, lemongrass essential oil is stored under different storage conditions under the influence of light and temperature, assessing the physical and chemical properties as well as the chemical composition of the citronella essential oil respectively. The change in the chemical composition of citronella oil is determined based on the storage time of 4 months under different conditions i.e. light (45 ºC) and in dark (4 ºC). To determine the change in the composition of the essential oil, based on the results of GC-MS analysis methods to monitor the chemical changes of the essential oil. The content of main components of citral and β-myrcene increases significantly after storage time under the influence of light and temperature. Some low content components (β-citronello, β-caryophyllen, p-cymen-8-ol, etc.) are likely to be oxidized and lost under light conditions, even in the dark. Therefore, the importance of external storage factors for the chemical and physical stability of essential oils is a matter of concern to control the quality of scientific evaluation.

scholarly journals Insights into the Essential Oil Compositions of Brazilian Red and Taiwanese Green Propolis

2017 ◽  
Vol 12 (2) ◽  
pp. 1934578X1701200 ◽  
Author(s):  
Boryana Trusheva ◽  
Daniela Ivanova ◽  
Milena Popova ◽  
Vassya Bankova
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Methyl Eugenol ◽  
Volatile Components ◽  
Trans Methyl ◽  
Type Apparatus

The objective of the present study was to characterize chemically the essential oils of two distinct propolis types: Brazilian red and Taiwanese green. Unlike the non-volatile chemical composition of these types of propolis, which has been extensively studied, the knowledge of the essential oils is scarce or even not investigated. The essential oils were obtained by hydrodistillation of raw propolis samples using a Likens-Nickerson type apparatus and then analyzed by GC/MS. The main volatile components of Brazilian red propolis were the phenylpropanoids: elemicin (26.1–27.5%), methyl eugenol (16.3–23.8%), trans-methyl isoeugenol (9.2–11.6%), isoelemicin (6.1–7.1%) and trans-anethole (4.4–7.1%), while the major constituents of Taiwanese green propolis essential oil were: β-eudesmol (13.9%), 6-methyl-3,5-heptadiene-2-one (12.2%), γ-eudesmol (4.4%), geranial (4.1%) and 6-methyl-5-heptene-2-one (3.7%).

scholarly journals Chemical composition and antimicrobial activity of essential oils extracted from Amomum muricarpum Elmer from North Vietnam

2022 ◽  
Vol 11 (4) ◽  
pp. 523-530
Author(s):  
D. B. Thin ◽  
V. Q. Thanh ◽  
B. B. Thinh
Keyword(s):  
Gas Chromatography ◽  
Antimicrobial Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Antimicrobial Agents ◽  
The Philippines ◽  
Volatile Components ◽  
Broth Microdilution Method ◽  
North Vietnam

Abstract. Recent years have seen the development of bacterial resistance to currently available antibiotics, which necessitates a search for new antimicrobial agents. Amomum muricarpum Elmer is a widely used medicinal plant species in the genus Amomum (family Zingiberaceae) that is commonly found in Laos, the Philippines, China, and Vietnam. The present article describes the chemical composition and antimicrobial activity of essential oils extracted from the leaves and rhizomes of A. muricarpum from North Vietnam. The hydrodistilled essential oil was analyzed using gas chromatography and gas chromatography-mass spectrometry, with the broth microdilution method designed to evaluate its antimicrobial efficacy. The absolute yield of essential oils amounted to 0.11% and 0.13% (v/w) for leaves and rhizomes, respectively, on a dry weight basis. It was found that the leaves and rhizomes of A. muricarpum produce oils abounding in monoterpenes. Of the total identified volatile components in the leaf oil (97.18%), three main constituents include α-pinene (40.45%), linalool (12.34%), and β-pinene (10.31%). In the rhizome oil, the main constituents include α-pinene (48.10%), β-pinene (20.32%), and linalool (7.56%) of the total identified volatile components (98.08%). An antimicrobial activity test indicates that essential oils from the leaves and rhizome of A. muricarpum inhibit the growth of Staphylococcus aureus ATCC 25923, with a minimum inhibitory concentration (MIC) of 200 µg/ml. In addition, the rhizome essential oil also exhibits antimicrobial activity against Bacillus cereus ATCC 14579, with a MIC value of 200 µg/ml. The results indicate the potential of essential oils extracted from A. muricarpum as a source of antimicrobial agents.

Comparative Evaluation of the Chemical Composition of Essential Oil from Twig, Leaf and Root of Clerodendrum inerme (L.) Gaertn

2011 ◽  
Vol 343-344 ◽  
pp. 22-27 ◽  
Author(s):  
Dong Hai Li ◽  
Zhao Wang ◽  
Zhen Yi Liang ◽  
Xiao Bo Yang ◽  
Jing Xu
Keyword(s):  
Linoleic Acid ◽  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Comparative Evaluation ◽  
Dibutyl Phthalate ◽  
The Other ◽  
Main Component ◽  
Different Parts

This study was designed to comparative evaluate the chemical composition of the essential oil from twig, leaf and root parts ofClerodendrum inerme(L.)Gaertn. GC-MS analyses of the oils revealed the presence of 8, 8 and 6 compounds in the essential oils obtained by hydrodistillation from different parts, respectively. Higher amounts of esters were found to compose a major chemotype in diverse parts of the plant. Dibutyl phthalate was the main component of all the essential oils attaining in average 34.22%, 59.28% and 44.27% and the other kind of esters accounted for 38.30%, 17.28% and 10.89% in the twig, leaf and root parts, respectively. In addition, some pharmaceutical components such as stigmasterol, linoleic acid and ferruginol were discovered. The study offers theoretic basis for utilization of the traditional folk herbC. inerme.

scholarly journals The Composition of the Essential Oil of the Plant Phlomoides Nuda Growing in Uzbekistan

2021 ◽  
Vol 8 (9) ◽  
pp. 396
Author(s):  
Dilrabo Rakhimjonovna Khaydarova ◽  
Gopurjon Usmonovich Siddikov ◽  
Shavkat Vokhidovich Abdullaev ◽  
Bakhtiyor Khojiboyevich Tojiboyev
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Gas Chromatography Mass Spectrometry ◽  
Volatile Components ◽  
Flowering Period ◽  
Vegetative Organs ◽  
The Republic

This article is the first to study the chemical composition of the essential oils of the vegetative organs of the plant Phlomoidies nuda, distributed in Yangikurgan district of Namangan region of the Republic of Uzbekistan. The essential oils of the plant are separated by hydro-distillation, the chemical composition of which is studied by gas chromatography-mass spectrometry. According to the data, the volatile components of the surface during the flowering period of Ph nuda are 1-Butanol (5.3%), 3-Carene (6.7%), D-Limonene (8.7%),1,8-Cineole (11.1%), m-Cymene (5.7%) was detected.

scholarly journals Influence of hydrodistillation rate and hydromodule on chemical composition of Juniperus communis L. essential oil

2017 ◽  
Vol 71 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Vladimir Pavicevic ◽  
Marko Radovic ◽  
Svetomir Milojevic ◽  
Miljana Markovic ◽  
Mihailo Ristic ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Boiling Point ◽  
Antimicrobial Activities ◽  
Mass Composition ◽  
Optimal Time ◽  
Volatile Components ◽  
Oxygenated Monoterpene ◽  
Environmentally Friendly Process

Essential oils are aromatic, volatile, complex mixtures of various compounds, mainly hydrocarbons (monoterpene and sesquiterpene) and some oxygenated hydrocarbons. Juniper berry essential oil has wide application and high commercial value due to its considerable antimicrobial activities. It is used in medicine, food, cosmetic and pharmaceutical industry and veterinary medicine. Generally, it is obtained by hydrodistillation, technique for the extraction of substances which do not mix or mix very poorly with water and are unstable at their boiling temperatures. It provides high quality of essential oil and also represents a relatively simple, safe and environmentally friendly process. The variations in the chemical composition of the essential oil obtained from juniper berries at various distillation rates (3, 6 and 8 ml/min) and various mass ratio juniper berries?water (hydromodules - 1:3, 1:4 and 1:5) are presented in this paper. It is important to emphasize that the variations made influence only in quantitative (mass %), but not in qualitative chemical composition (no differences, same 58 components were detected in all experiments). To reflect those effects, only 23 identified components with the content higher than 0.5 mass % were selected, constituted 95?96 mass % of the essential oils. The major constituents of the essential oils were monoterpenes (67.39?71.00 mass %), followed by sesquiterpenes (21.64?24.54 mass %), while the oxygenated monoterpene (1.54?2.42 mas. %) and oxygenated sesquiterpenes (0.89?1.46 mass %) were much less present. According to volatility, the high volatile (boiling point 153?167?C) components are the main constituents of the essential oils (61.69?63.81 mass %), followed by the low volatile (boiling point 252?288oC) components (22.57?26.04 mass %), and the least present medium volatile (boiling point 173?212?C) components (7.24?9.61 mass %). The variations in the mass content of the essential oil at various distillation rates showed clear general trends for all hydromodules (with exceptions at some components). With the increasing of distillation rate, mass % of high and medium volatile components decreased, while mass % of low volatile components increased. This is caused by higher extraction of low volatile components at high distillation rate, which resulted the increasing of their mass %. The variations in the mass composition of the essential oil at various hydromodules showed less expressive trends for all distillation rates. That means it has much less influence on the mass composition than the variation of distillation rate. Therefore, experiments at various distillation rates should be continued in combination with the fractionation of the essential oil by simultaneous hydrodistillation and rectification, including the effects of preparation procedures of juniper berries and defining of optimal energy consumption, i.e. optimal time period of hydrodistillation.

scholarly journals ESSENTIAL OIL AND VOLATILE COMPONENTS DRACOCEPHALUM DIVERSIFOLIUM

2020 ◽  
pp. 87-92
Author(s):  
Shohista Olimovna Meliyeva ◽  
Khairulla Mamadievich Bobakulov ◽  
Nilufar Sagdullaevna Abdullayeva ◽  
Komila Alibekovna Eshbakova ◽  
Amindjan Karimov
Keyword(s):  
Comparative Analysis ◽  
Chemical Composition ◽  
Essential Oil ◽  
Aerial Part ◽  
Oil Content ◽  
Component Composition ◽  
Volatile Components ◽  
Aerial Parts ◽  
The Family ◽  
First Time

Plants of the genus Dracocephalum belong to the subfamily Nepetoideae of the family Lamiaceae of the order Lamiales and include about 70 species worldwide. In Uzbekistan grows 16 species of this genus. The purpose of this study was to study the chemical composition of the essential oil and gasoline extract of Dracocephalum diversifolium. To obtain the essential oil and gasoline extract were used the aerial parts of the plant (stems, flowers and leaves). Essential oil was isolated by hydrodistillation method. The gasoline extract was obtained by treating the air-dried aerial part of the plant with extraction gasoline. The composition of the isolated essential oil and gasoline extract was studied by GC-MS. It was revealed that the predominant components of essential oil content of D. diversifolium was sabinene (20.7%), β-pinene (10.6%), DL-limonene (7.5%), trans-valerenil acetate (7.5%), m-cymene (6.2%), 1,8-cineole (5.0%), T-cadinol acetate (4.4%), δ-cadinene (3.9%), caryophyllene (2.4%). Among the volatiles of the gasoline extract of D. diversifolium was dominated 1,8-cineole (17.0%), 3,5,5,9-tetramethyl-2,4a,5,6,9,9a-hexahydro-1H-benzo[a]cycloheptene (11.2%), δ-cadinene (8.7%), myrtenyl acetate (4.3%), β-pinene (3.9%), 4-terpinenyl acetate (3.2%), δ-cadinol (3.1%), δ-elemene (2.8%), eremophila-1(10),8,11-triene (2.8%), sabina ketone (2.5%), m-cymol (2.2%), 10,12-octadecadiynoic acid (2.0%). For the first time, by hydrodistillation method isolated essential oil from the aerial part of D. diversifolium, growing in Uzbekistan, in which 29 compounds were identified by GC-MS analysis. For the first time the chemical composition of the gasoline extract of the aerial part of D. diversifolium was studied by GC-MS. It was identified 28 components. A comparative analysis of the component composition of the essential oil and gasoline extract of D. diversifolium was carried out, in which established the dominant components for each sample.

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