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Search Results: 1 - 10 of 2549 matches for " essential oils "
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Antimicrobial Activity of the Essential Oil from Hyptis carpinifolia Benth  [PDF]
Karen Caroline Camargo, Luís Roberto Batista, Paulo Estev?o de Souza, Maria Luisa Teixeira, Thaís Aparecida Sales, Vanuzia Rodrigues Fernandes Ferreira, Jéssica Oliveira e Nogueira, Maísa Lamounier Magalh?es, Alex Rodrigues Silva Caetano, David Lee Nelson, Maria das Gra?as Cardoso
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.811195
Abstract: Essential oils are secondary metabolites whose biological properties have been studied with emphasis on antimicrobial activity. Hyptis carpinifolia Benth (Rosmaninho) is used in folk medicine in the fight against colds and rheumatism. The objective of this study was to evaluate the antimicrobial activity of the essential oil from H. carpinifolia. The essential oil was extracted by hydrodistillation using a modified Clevenger apparatus. The biological activity was determined using the Agar Cavity Diffusion technique to evaluate the effect of concentrations of 500, 250, 125, 62.5, 31.25, 15.62, 7.81 and 3.9 μg·mL-1 on the bacteria Escherichia coli, Listeria monocytogenes, Salmonella Choleraesuis, Staphylococcus aureus and Pseudomonas aeruginosa. The fungicidal potential was evaluated by the method of dilution in agar, and the percentage inhibition of mycelial growth of Alternaria alternata, Botrytis cinerea and Fusarium oxysporum was evaluated. The dilutions tested were 1000, 750, 500, 250 and 100 μL·L-1. The minimum inhibitory concentrations (MIC) of the essential oil for L. monocytogenes, S. aureus and E. coli were 31.25;
Antimicrobial activity of multipurpose essential oil blends  [PDF]
Harold Edward Laubach, Simone Hobus Ghanavati, Geraldine Whidden
Health (Health) , 2012, DOI: 10.4236/health.2012.48070
Abstract: Two types of multipurpose essential oil blends, blend11 containing eleven different essential oils and blend12 containing twelve, were tested against bacterial strains of Pseudomonas aeruginosa ATCC 9027, Serratia marcescens ATCC 13880 and Staphylococcus aureus ATCC 6538 and against the fungi, Candida albicans ATCC 10231, Aspergillus fumigatus ATCC 10894 and Fusarium solani ATCC 36031 to determine the spectrum of in vitro antimicrobial activity using aromatograms (paper disc diffusion assays). Microbial growth was decreased by multipurpose blend11 and blend12 in a similar manner. The saline control disc did not inhibit antimicrobial growth while the two blends exhibited significant zones of inhibition for all 3 bacteria and for the 3 fungi. The greatest antibacterial activity of blend11 and blend12 was exhibited with P. aeruginosa and S. marcescens followed by S. aureus. A high level of activity was associated with C. albicans and a lower level with F. solani followed by A. fumigatus. It is clearly evident from previous published studies that no single essential oil will effectively inhibit the growth of all of the organisms in our study. However, our results demonstrate that blend11 and blend12 have a broad range of inhibitory activity affecting all of the microorganisms tested.
Evaluation of the neuropharmacological properties of nerol in mice  [PDF]
Thiago Henrique Costa Marques, Maria Leonildes Boavista Gomes Castelo Branco Marques, Douglas dos Santos Lima, Hálmisson D’árley Santos Siqueira, Maria do Socorro Boavista Gomes Castelo Branco, Alexandre Araújo de Souza, Dami?o Pergentino de Sousa, Rivelilson Mendes de Freitas
World Journal of Neuroscience (WJNS) , 2013, DOI: 10.4236/wjns.2013.31004
Abstract:

The search for therapeutic agents that will provide the ground for man and an improvement in their quality of life is ceaseless. The nerol (cis-2,6-dimethyl-2,6-octadien-8-ol) is a monoterpene which can be found in various medicinal plants as Lippia spp and Melissa officinalis L. The objective of this study was to analyze the acute effect of nerol in the central nervous system (CNS) by performing behavioral tests in mice (open field, elevated plus-maze, light/dark and rota rod tests). We used male albino mice (Mus musculus), Swiss variety, adult with 2 month-old. The animals were divided into five groups (n = 8) for each experimental protocol, and they were administered intraperitoneally (i.p.), respectively, Tween 80 0.05% dissolved in saline solution 0.9%, nerol (30, 60 or 90 mg/kg) or diazepam (2 mg/kg). In the open field test, all groups treated with nerol showed a significant decrease in motor activity (number of crossings, rearings and groomings) when compared with vehicle group. In the elevated plus-maze test, nerol groups significantly increased the number of entries and time of permanence in the open arms when compared with vehicle group. In the light-dark test, nerol groups showed a significant increase the time of permanence in the room clear when compared with vehicle group. In the rota rod test, the groups treated with nerol didn’t show modification in time spent and number of falls in the revolving bar when compared with vehicle group. These results indicate a possible anxiolytic effect of nerol in mice.

Microencapsulation of Essential Oils within Alginate: Formulation and in Vitro Evaluation of Antifungal Activity  [PDF]
E. A. Soliman, A. Y. El-Moghazy, M. S. Mohy El-Din, M. A. Massoud
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2013, DOI: 10.4236/jeas.2013.31006
Abstract: Essential oils (EOs) are the volatile lipophilic components extracted from plants. Many EOs have demonstrated strong antimicrobial properties when tested in in vitro experiments. The commercial applications of these EOs require a suitable formulation constituted by biodegradable compounds that protect them from degradation and evaporation at the same time that allows for a sustained release. The objective of this study was therefore to reduce the rate of evaporation of the oil via microencapsulation. Alginate microspheres (AMSs) were prepared using emulsion extrusion method. The AMSs were hardened with a cross-linking agent, calcium chloride. The effects of the three variables: alginate concentration (0.5% - 8%), the amount of cross-linking agent (0.125% - 2%) and time of cross-linking (5 - 30 min.) on loading capacity and encapsulation efficiency (EE, %) were studied. The effect of the amount of cross-linker was significant on loading capacity (%) and EE (%). The AMSs under the optimized conditions provided loading capacity of 22% - 24% and EE of 90% - 94% based on type of EO. The antifungal activity of vapors of microencapsulated and non-microencapsulated oils were evaluated against two of pathogenic fungi species for stored grains: Aspergillus niger and Fusarium verticillioides. The optimized MSs were observed to have a sustained in vitro release profile (50% of the antifungal activity was maintained at the 8th day of the study). In conclusion, encapsulation in Ca-alginate microspheres may effectively reduce the evaporation rate of essential oils, thus increase the potential antifungal activity.


Identification of volatile compounds in thinning discards from plum trees (Prunus salicina Lindl.) cultivar Harry Pickstone
Podestá, Rossana;Pagliosa, Cristiane Manfé;Vieira, Manoela Alano;Provesi, Jo?o Gustavo;Amante, Edna Regina;Zeni, Ana Lúcia Bertarello;Raitz, Ismael;Rebelo, Ricardo Andrade;
Ciência e Tecnologia de Alimentos , 2011, DOI: 10.1590/S0101-20612011000300024
Abstract: plum (prunus salicina lindl. cv. harry pickstone), a china indigenous fruit, is widely produced and consumed in countries such as japan and brazil. the practice of thinning is common in horticulture and the fruits removed are discarded as waste. like the great majority of vegetables, these thinning discards also contain essential oils which have not been investigated until the present time. the extraction of the plum thinning discards volatile oil, through the hydrodistillation method, produced a yield of 0.06% (m/m) and a total of 21 components were identified, with 11 of them being responsible for 72,9% of the total oil composition. the major compounds determined through gc and gc-ms were z-α-bisabolene (13.7%), n-hexadecanoic acid (12.7%), phytol (12.7%), and β-caryophyllene (10.4%).
De aromas e perfumes, o mercado da indústria do "cheiro"
Speziali, Marcelo Gomes;
Química Nova , 2012, DOI: 10.1590/S0100-40422012000400038
Abstract: several flavors and fragrances (f&f) companies hold the economic leadership in the market, although not always have also the leadership in patent applications. the ranking of technological production in the fragrance area still remains with industries while scientific knowledge is equally shared between industries and academia. contextualizing brazil in this scene, despite all scientific expertise gained over the years, brazilian technological park is still at the beginning of the production of technologies applied directly to the f&f industries. the dependence on foreign technologies is remarkable as indicated by the great trade deficit in this sector.
Un sistema para la deteccion de antioxidantes volatiles comunmente emitidos desde especias y hierbas medicinales
Pastene, Edgar;Gómez, Maritza;Speisky, Hernán;Nú?ez-Vergara, Luís;
Química Nova , 2009, DOI: 10.1590/S0100-40422009000200035
Abstract: an apparatus which allows the direct measurement of the antioxidant capacity of volatiles compounds emitted from some herbs and culinary spices is described. the device comprises: a sample chamber, a mixing chamber, a pump and, a detection system. volatiles from clove (syzygium aromaticum (l.) merr. & l.m. perry) were purged and captured into a dpph-containing solution and changes in the absorbance were recorded on-line. linear response was observed when temperature was set between 30-53 oc; nitrogen flow was 15 ml min-1 during 60 min; dpph concentration was 20 μmol l-1 and a sample size (powdered clove) ranged between 200-1000 mg.
Estudo comparativo dos óleos voláteis de algumas espécies de Piperaceae
Mesquita, J.M.O.;Cavaleiro, C.;Cunha, A.P.;Lombardi, J.A.;Oliveira, A.B.;
Revista Brasileira de Farmacognosia , 2005, DOI: 10.1590/S0102-695X2005000100003
Abstract: essential oils from various vegetal species of the piperaceae family were analysed by capillary gas chromatography (gc) and gas chromatography/mass spectrometry (gc/ms). the investigated species were: piper aduncum, p. amalago, p. arboreum, p. cernuum, p. hispidum, p. regnelii, p. submarginalum, p. vicosanum and pothomorphe umbellata. over 80% of the essential oils compounds were identified by the qualitative and quantitative analysis. the analysed species showed the predominance of sesquiterpenoids, except for p. hispidum, p. submarginalum and p. vicosanum in which the predominant compounds were monoterpenoids. for the 9 studied species, the major compounds found in the oils were b-pinene (9/9) and spathulenol (9/9), followed by the e-caryophyllene (8/9), caryophyllene oxide (8/9), germacrene d (7/9), a-pinene (7/9) and limonene (6/9).
Compuestos Antimicrobianos Adicionados en Recubrimientos Comestibles para Uso en Productos Hortofrutícolas
Ramos-García, Margarita de Lorena;Bautista-Ba?os, Silvia;Barrera-Necha, Laura Leticia;Bosquez-Molina, Elsa;Alia-Tejacal, Irán;Estrada-Carrillo, Marisa;
Revista mexicana de fitopatología , 2010,
Abstract: coatings and films are continuous matrixes typically formulated of lipids, proteins and carbohydrates or their combination. a carbohydrate used to formulate edible coatings is the chitosan that reduces the growth of fungi and bacteria. coatings may work as vehicles of a broad range of food additives including antimicrobial compounds in order to provide higher attributes such as the control of microorganism. essential oils are among the natural additives. there is broad evidence that essential oils extracted from different plant species present inhibition against fungi and bacteria. the incorporation of chitosan and essential oils into the edible formulations avoids the development of microorganism and extends the storage life of the horticultural commodity. in this article, a literature review about the main components of the coatings and its effect on the physiology of the commodity was carried. a revision of literature about the effect of chitosan and the addition of essential oils on the activity of pathogenic microorganisms was also carried out.
Determining Chemical Composition and Antimicrobial Activity of Feverfew (Tanacetum parthenium L.) Essential Oil on Some Microbial Strains
Zahra Izadi,Majid Aghaalikhani,Mahmood Esna-Ashari,Poorandokht Davoodi
Zahedan Journal of Research in Medical Sciences , 2013,
Abstract: Background: Feverfew (Tanacetum parthenium L.) is a herbal plant that has anti- septic, anti-microbial, anti-parasitic and anti-inflammatory effects. The main objective of this study is to evaluate the antimicrobial effect of shoot essential oil (essential oil of the aerial parts of the plant) of the feverfew on a number of microorganisms including gram-negative and gram-positive bacteria, filamentous fungi and yeasts. Materials and Methods: In this empirical study, plant samples were collected at the full blooming stage. Shoot essential oil was extracted using hydro-distillation technique and Clevenger apparatus. Components of the extract were identified using GC and GC/MS apparatus and its antimicrobial properties were evaluated using diffusion in Agar method (disk diffusion) and dilution in the well (Micro-broth dilution).Results: Among 35 compounds identified in the essential oil of the feverfew, camphor (45%), chrysanthenyl acetate (21.5) and camphene (9.6%), were the main components respectively. Essential oil showed very good antifungal effect which was stronger than its antibacterial effect. Gram-negative bacteria were less sensitive to the essential oil than gram-positive bacteria. The mean diameter of inhibition zone, in the bio-assessment of the effect of feverfew essential oil on gram-positive bacteria and fungi was respectively more than the effect of vancomycin and amphotericin B and this effect on gram-negative bacteria was less than the effect of gentamicin. This effect is attributed to the high value of camphor, chrysanthenyl acetate and camphene found in the essential oil.Conclusion: Feverfew essential oil could be utilized as a sound and harmless substitute for the antibiotics.
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