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"Essential oils"

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https://www.readbyqxmd.com/read/28431313/raman-spectroscopy-for-the-characterization-of-different-fractions-of-hemp-essential-oil-extracted-at-130%C3%A2-c-using-steam-distillation-method
#1
Muhammad Asif Hanif, Haq Nawaz, Saima Naz, Rubina Mukhtar, Nosheen Rashid, Ijaz Ahmad Bhatti, Muhammad Saleem
In this study, Raman spectroscopy along with Principal Component Analysis (PCA) is used for the characterization of pure essential oil (pure EO) isolated from the leaves of the Hemp (Cannabis sativa L.,) as well as its different fractions obtained by fractional distillation process. Raman spectra of pure Hemp essential oil and its different fractions show characteristic key bands of main volatile terpenes and terpenoids, which significantly differentiate them from each other. These bands provide information about the chemical composition of sample under investigation and hence can be used as Raman spectral markers for the qualitative monitoring of the pure EO and different fractions containing different active compounds...
April 1, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28431295/clove-and-rosemary-essential-oils-and-encapsuled-active-principles-eugenol-thymol-and-vanillin-blend-on-meat-quality-of-feedlot-finished-heifers
#2
Jéssica de Oliveira Monteschio, Kennyson Alves de Souza, Ana Carolina Pelaes Vital, Ana Guerrero, Maribel Velandia Valero, Emília Maria Barbosa Carvalho Kempinski, Vinícius Cunha Barcelos, Karina Favoreto Nascimento, Ivanor Nunes do Prado
Forty Nellore heifers were fed (73days) with different diets: with or without essential oils (clove and/or rosemary essential oil) and/or active principle blend (eugenol, thymol and vanillin). The pH, fat thickness, marbling, muscle area and water losses (thawing and drip) were evaluated 24h post mortem on the Longissimus thoracis, and the effects of aging (14days) was evaluated on the meat cooking losses, color, texture and lipid oxidation. Antioxidant activity was also evaluated. Treatments had no effect (P>0...
April 5, 2017: Meat Science
https://www.readbyqxmd.com/read/28426414/amoebicidal-activity-of-%C3%AE-bisabolol-the-main-sesquiterpene-in-chamomile-matricaria-recutita-l-essential-oil-against-the-trophozoite-stage-of-acanthamoeba-castellani-neff
#3
Soumaya Hajaji, Ines Sifaoui, Atteneri López-Arencibia, María Reyes-Batlle, Basilio Valladares, José E Pinero, Jacob Lorenzo-Morales, Hafidh Akkari
Acanthamoeba genus includes opportunistic pathogens which are distributed worldwide and are causative agents of a fatal encephalitis and severe keratitis in humans and other animals. Until present there are not fully effective therapeutic agents against this pathogen and thus the need to search for novel anti-amoebic compounds is urgent. Recently, essential oils of aromatic and medicinal plants have shown activity against Acanthamoeba strains. Therefore, this study was aimed to evaluate the activity of main component of chamomile essential oil (a sesquiterpene) namely α-bisabolol against the Acanthamoeba castellani Neff strain...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28426256/effects-of-foeniculum-vulgare-essential-oil-compounds-fenchone-and-limonene-on-experimental-wound-healing
#4
I Keskin, Y Gunal, S Ayla, B Kolbasi, A Sakul, U Kilic, O Gok, K Koroglu, H Ozbek
We investigated the wound healing efficacy of the Foeniculum vulgare compounds, fenchone and limonene, using an excisional cutaneous wound model in rats. An excision wound was made on the back of the rat and fenchone and limonene were applied topically to the wounds once daily, separately or together, for 10 days. Tissue sections from the wounds were evaluated for histopathology. The healing potential was assessed by comparison to an untreated control group and an olive oil treated sham group. We scored wound healing based on epidermal regeneration, granulation tissue thickness and angiogenesis...
April 20, 2017: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
https://www.readbyqxmd.com/read/28425569/a-comparative-study-of-natural-antimicrobial-delivery-systems-for-microbial-safety-and-quality-of-fresh-cut-lettuce
#5
Laura E Hill, Daniela A Oliveira, Katherine Hills, Cassie Giacobassi, Jecori Johnson, Harvey Summerlin, T Matthew Taylor, Carmen L Gomes
Nanoencapsulation can provide a means to effectively deliver antimicrobial compounds and enhance the safety of fresh produce. However, to date there are no studies which directly compares how different nanoencapsulation systems affect fresh produce safety and quality. This study compared the effects on quality and safety of fresh-cut lettuce treated with free and nanoencapsulated natural antimicrobial, cinnamon bark extract (CBE). A challenge study compared antimicrobial efficacy of 3 different nanoencapsulated CBE systems...
April 20, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28425475/insecticidal-activity-of-garlic-essential-oil-and-their-constituents-against-the-mealworm-beetle-tenebrio-molitor-linnaeus-coleoptera-tenebrionidae
#6
Angelica Plata-Rueda, Luis Carlos Martínez, Marcelo Henrique Dos Santos, Flávio Lemes Fernandes, Carlos Frederico Wilcken, Marcus Alvarenga Soares, José Eduardo Serrão, José Cola Zanuncio
This study evaluated the insecticidal activity of garlic, Allium sativum Linnaeus (Amaryllidaceae) essential oil and their principal constituents on Tenebrio molitor. Garlic essential oil, diallyl disulfide, and diallyl sulfide oil were used to compare the lethal and repellent effects on larvae, pupae and adults of T. molitor. Six concentrations of garlic essential oil and their principal constituents were topically applied onto larvae, pupae and adults of this insect. Repellent effect and respiration rate of each constituent was evaluated...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28425269/evaluation-of-cytotoxic-membrane-and-dna-damaging-effects-of-thymus-revolutus-c%C3%A3-lak-essential-oil-on-different-cancer-cells
#7
Aysun Özkan, Ayşe Erdoğan
BACKGROUND/AIM: In this study, we evaluated Thymus revolutus Célak essential oil and its two main constituents, γ-terpinene and p-cymene, as potential oxidative agents against lung cancer and epidermoid carcinoma cells. MATERIALS AND METHODS: Cell viability assessment was made by CellTiter-Blue1397904493 cell viability and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay after treatment with 5-600 μg/mL concentrations of essential oil, γ-terpinene, and p-cymene...
April 18, 2017: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/28423422/immunological-responses-of-sesamia-cretica-to-ferula-ovina-essential-oil
#8
Reza Sadeghi, Niloofar Hadizadeh Raeisi, Arsalan Jamshidnia
The current research was performed aiming to investigate the effects of Ferula ovina essential oil on the fourth instar larval hemogram of Sesamia cretica. Four main sorts of circulating hemocytes, including prohemocytes, plasmatocytes, granulocytes (GRs), and oenocytoides, were identified in the fourth instar larvae. Treatment of the larvae with the concentration of 1000 ppm of the essential oil led to an enhancement of the total hemocyte and GR count followed by a dose-dependent decrease at the concentrations of 2500 and 7000 ppm...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28423080/s-and-r-linalool-a-comparison-of-the-in-vitro-anti-aeromonas-hydrophila-activity-and-anesthetic-properties-in-fish
#9
Lenise L Silva, Luana S Balconi, Letícia T Gressler, Quelen I Garlet, Fernando J Sutili, Agueda P C Vargas, Bernardo Baldisserotto, Ademir F Morel, Berta M Heinzmann
Linalool is the main compound of many essential oils and occurs in two isomeric forms: S-(+)- and R-(-)-linalool. This study aimed to determine if linalool isomers have different antimicrobial and anesthetic properties in fish. For this purpose, these compounds were previously isolated from Lippia alba (Mill.)N. E. Brown and Ocimum americanum L. essential oils. Antimicrobial effects were evaluated through the microdilution test against Aeromonas hydrophila, an important fish disease etiologic agent. Induction time until sedation, anesthesia and recovery time were determined in silver catfish (Rhamdia quelen) through bath exposure (60, 180, 300 or 500 μL L-1)...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28422413/essential-oils-as-biocides-for-the-control-of-fungal-infections-and-devastating-pest-tuta-absoluta-of-tomato-lycopersicon-esculentum-mill
#10
Samira Bouayad Alam, Mohammed El Amine Dib, Nassim Djabou, Boufeldja Tabti, Nassira Guaouar, Jean Costa, Alain Muselli
Thymus capitatus and Tetraclinis articulata essential oils as well their major components (carvacrol and α-pinene) were evaluated for their antifungal and insecticidal activities. Both oils showed good in vitro antifungal activity against Fusarium oxysporum, Aspergillus niger, Penicillium sp, Alternaria alternata and Botrytis cinerea, the fungi causing tomato rot. In vivo results indicate the efficacies of both essential oils and carvacrol of reduce postharvest fungal pathogens, such as B. cinerea and A. alternata that are responsible of black and gray rot of tomato fruit...
April 19, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28422054/growth-inhibition-of-sulfate-reducing-bacteria-in-produced-water-from-the-petroleum-industry-using-essential-oils
#11
Pamella Macedo de Souza, Fátima Regina de Vasconcelos Goulart, Joana Montezano Marques, Humberto Ribeiro Bizzo, Arie Fitzgerald Blank, Claudia Groposo, Maíra Paula de Sousa, Vanessa Vólaro, Celuta Sales Alviano, Daniela Sales Alviano Moreno, Lucy Seldin
Strategies for the control of sulfate-reducing bacteria (SRB) in the oil industry involve the use of high concentrations of biocides, but these may induce bacterial resistance and/or be harmful to public health and the environment. Essential oils (EO) produced by plants inhibit the growth of different microorganisms and are a possible alternative for controlling SRB. We aimed to characterize the bacterial community of produced water obtained from a Brazilian petroleum facility using molecular methods, as well as to evaluate the antimicrobial activity of EO from different plants and their major components against Desulfovibrio alaskensis NCIMB 13491 and against SRB growth directly in the produced water...
April 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28421828/jasmonic-acid-changes-the-composition-of-essential-oil-isolated-from-narrow-leaved-lavender-propagated-in-in-vitro-cultures
#12
D Andrys, M Adaszyńska-Skwirzyńska, D Kulpa
The aim of the present study was to determine the effect of jasmonic acid added to the culture medium on composition of Lavandula angustifolia essential oils. The chemical composition was determined by gas chromatography coupled to mass detector (GC/MS). The experiment was conducted with the use of MS medium supplemented with increasing concentration of JA (0.2, 0.5, 1, 1.5 mg∙dm(-3)). It was found that the analysed essential oils varied in terms of chemical composition depending on the content of JA in the medium...
April 19, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28420198/chemical-constituents-of-supercritical-extracts-from-alpinia-officinarum-and-the-feeding-deterrent-activity-against-tribolium-castaneum
#13
Mintong Xin, Shanshan Guo, Wenjuan Zhang, Zhufeng Geng, Junyu Liang, Shushan Du, Zhiwei Deng, Yongyan Wang
Alpinia officinarum has been confirmed to possess bioactivities against some pests. In this work, a sample was obtained from A. officinarum rhizomes by supercritical fluid CO₂ extraction (SFE). According to GC-MS analysis, the main chemical components for SFE-sample included benzylacetone (26.77%), 1,7-diphenyl-5-hydroxy-3-heptanone (17.78%), guaiacylacetone (10.03%) and benzenepropanal (7.42%). The essential oil of A. officinarum rhizomes (LD50 = 20.71 μg/adult) exhibited more contact toxicity than SFE extract (LD50 = 82...
April 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28420101/the-effect-of-citrus-essential-oils-and-their-constituents-on-growth-of-xanthomonas-citri-subsp-citri
#14
Hossein Mirzaei-Najafgholi, Saeed Tarighi, Morteza Golmohammadi, Parissa Taheri
Citrus bacterial canker (CBC) caused by Xanthomonas citri subsp. citri (Xcc), is the most devastating of the citrus diseases worldwide. During our study, we found that Essential oils (EOs) of some citrus cultivars are effective on Xcc. Therefore, it prompted us to determine the plant metabolites responsible for the antibacterial properties. We obtained EOs from some locally cultivated citrus by using a Clevenger apparatus and their major constituents were identified by gas chromatography/mass spectrometry (GC-MS)...
April 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28417946/essential-oils-of-hyptis-pectinata-chemotypes-isolation-binary-mixtures-and-acute-toxicity-on-leaf-cutting-ants
#15
Rosana B Feitosa-Alcantara, Leandro Bacci, Arie F Blank, Péricles B Alves, Indira Morgana de A Silva, Caroline A Soares, Taís S Sampaio, Paulo Cesar de L Nogueira, Maria de Fátima Arrigoni-Blank
Leaf-cutting ants are pests of great economic importance due to the damage they cause to agricultural and forest crops. The use of organosynthetic insecticides is the main form of control of these insects. In order to develop safer technology, the objective of this work was to evaluate the formicidal activity of the essential oils of two Hyptis pectinata genotypes (chemotypes) and their major compounds on the leaf-cutting ants Acromyrmex balzani Emery and Atta sexdens rubropilosa Forel. Bioassays of exposure pathways (contact and fumigation) and binary mixtures of the major compounds were performed...
April 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28417912/electrospun-fiber-pads-of-cellulose-acetate-and-essential-oils-with-antimicrobial-activity
#16
Ioannis L Liakos, Alina Maria Holban, Riccardo Carzino, Simone Lauciello, Alexandru Mihai Grumezescu
The method of electrospinning was used to create nanofibers made of cellulose acetate (CA) and essential oils (EOs). CA polymer at 15% w/v was dissolved in acetone and then 1% or 5% v/v of EOs was added to the polymer solution. The utilized essential oils were rosemary and oregano oils. Then, the CA/EOs in acetone solution were electrospun, creating micro/nanofibers, approximately 700-1500 nm in diameter. Raman spectroscopy was used to detect the attachment of the EOs in the CA electrospun fibers (ESFs). Scanning electron microscopy was used to study the morphology, topography and dimensions of the ESFs...
April 12, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28416272/biocidal-effects-of-piper-hispidinervum-piperaceae-essential-oil-and-synergism-among-its-main-components
#17
M F Andrés, G E Rossa, E Cassel, R M F Vargas, O Santana, C E Díaz, A González-Coloma
In this study we evaluated the effect of a pressure gradient (1-2 atm) in the extraction and composition of the essential oil (EO) of Piper hispidinervum by steam distillation. We also evaluated the insect antifeedant effects (Spodoptera littoralis, Leptinotarsa decemlineata, Myzus persicae and Rhopalosiphum padi) and nematicidal activity (Meloidogyne javanica) of the oils, their major components and their synergistic interactions. Safrole was the major component (78-81%) followed by terpinolene (5-9%). The EOs tested were effective insect antifeedants...
April 14, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28408818/anti-inflammatory-activity-of-niosomes-entrapped-with-plai-oil-zingiber-cassumunar-roxb-by-therapeutic-ultrasound-in-a-rat-model
#18
Jirakrit Leelarungrayub, Jiradej Manorsoi, Aranya Manorsoi
OBJECTIVE: The aim of this study was to evaluate the antioxidant and anti-inflammatory activities of Plai oil-encapsulated niosomes (Zingiber cassumunar Roxb.) on inflamed subcutaneous Wistar rat skin by therapeutic ultrasound. METHODS: Pure oil from Plai rhizomes was extracted by steam distillation, and antioxidant activities were determined by 2,2-diphenyl-1-picrylhydrazyl radical scavenging assay. Bioactive compounds were analyzed by gas chromatography-mass spectrometry...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28407719/anti-inflammatory-activity-of-clove-eugenia-caryophyllata-essential-oil-in-human-dermal-fibroblasts
#19
Xuesheng Han, Tory L Parker
CONTEXT: Clove (Eugenia caryophyllata Thunb. [Myrtaceae]) essential oil (CEO) has been shown to possess antimicrobial, antifungal, antiviral, antioxidant, anti-inflammatory and anticancer properties. However, few studies have focused on its topical use. OBJECTIVE: We investigated the biological activity of a commercially available CEO in a human skin disease model. MATERIALS AND METHODS: We evaluated the effect of CEO on 17 protein biomarkers that play critical roles in inflammation and tissue remodelling in a validated human dermal fibroblast system, which was designed to model chronic inflammation and fibrosis...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/28407077/chemosensory-responses-to-the-repellent-nepeta-essential-oil-and-its-major-component-nepetalactone-by-aedes-aegypti-diptera-culicidae-a-vector-of-zika-virus
#20
Jackson T Sparks, Jonathan D Bohbot, Mihailo Ristic, Danijela Mišic, Marijana Skoric, Autar Mattoo, Joseph C Dickens
Nepeta essential oil (Neo; catnip) and its major component, nepetalactone, have long been known to repel insects including mosquitoes. However, the neural mechanisms through which these repellents are detected by mosquitoes, including the yellow fever mosquito Aedes aegypti (L.), an important vector of Zika virus, were poorly understood. Here we show that Neo volatiles activate olfactory receptor neurons within the basiconic sensilla on the maxillary palps of female Ae. aegypti. A gustatory receptor neuron sensitive to the feeding deterrent quinine and housed within sensilla on the labella of females was activated by both Neo and nepetalactone...
April 12, 2017: Journal of Medical Entomology
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