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Essential oils

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https://www.readbyqxmd.com/read/29166272/in-vitro-activity-of-some-essential-oils-alone-and-in-combination-against-the-fish-pathogen-nocardia-seriolae
#1
T F Ismail, T Yoshida
Microplate resazurin assay was applied to investigate the in vitro activity of four essential oils (EOs); cinnamon (Cinnamomum zeylanicum), thyme (Thymus vulgaris), lemongrass (Cymbopogon flexuosus) and tea tree (Melaleuca alternifolia) oils against 80 clinical isolates of the fish pathogen Nocardia seriolae. The checkerboard test was then used to determine the possible synergistic effect of EOs combination against reference type strains of fish nocardiosis. All tested EOs had antibacterial activity against N...
September 26, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/29164813/chemical-polymorphism-of-essential-oils-of-artemisia-vulgaris-growing-wild-in-lithuania
#2
Asta Judzentiene, Jurga Budiene
Compositional variability of mugwort (Artemisia vulgaris L.) essential oils has been investigated in the study. Plant material (over ground parts at full flowering stage) was collected from forty-four wild populations in Lithuania. The oils from aerial parts were obtained by hydrodistillation and analyzed by GC(FID) and GC/MS. In total, up to 111 components were determined in the oils. As the major constituents were found: sabinene, 1,8-cineole, artemisia ketone, both thujone isomers, camphor, cis-chrysanthenyl acetate, davanone and davanone B...
November 21, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/29164186/phenylalanine-and-derivatives-as-versatile-low-molecular-weight-gelators-design-structure-and-tailored-function
#3
REVIEW
Tanmay Das, Marleen Häring, Debasish Haldar, David Díaz Díaz
Phenylalanine (Phe) is an essential amino acid classified as neutral and nonpolar due to the hydrophobic nature of the benzyl side chain. In the field of materials science, the chemical modification of phenylalanine at C or N terminus has enabled to synthesize a large number of low-molecular-weight gelators over the past decade. Thus, many physical (or supramolecular) softgel materials have been fabricated by self-assembly of Phe-derived building blocks, which can be programmed with atomic level information and modification...
November 22, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/29163441/antifungal-and-anti-biofilm-activity-of-essential-oil-active-components-against-cryptococcus-neoformans-and-cryptococcus-laurentii
#4
Poonam Kumari, Rutusmita Mishra, Neha Arora, Apurva Chatrath, Rashmi Gangwar, Partha Roy, Ramasare Prasad
Cryptococcosis is an emerging and recalcitrant systemic infection occurring in immunocompromised patients. This invasive fungal infection is difficult to treat due to the ability of Cryptococcus neoformans and Cryptococcus laurentii to form biofilms resistant to standard antifungal treatment. The toxicity concern of these drugs has stimulated the search for natural therapeutic alternatives. Essential oil and their active components (EO-ACs) have shown to possess the variety of biological and pharmacological properties...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29162539/modulation-of-diverse-oncogenic-transcription-factors-by-thymoquinone-an-essential-oil-compound-isolated-from-the-seeds-of-nigella-sativa-linn
#5
REVIEW
Muthu K Shanmugam, Frank Arfuso, Alan Prem Kumar, Lingzhi Wang, Boon Cher Goh, Kwang Seok Ahn, Anupam Bishayee, Gautam Sethi
Thymoquinone (TQ), isolated almost fifty years ago, is the main bioactive constituent of black seed essential oil extracted from the seed of Nigella sativa. TQ has been shown to have promising effects against a variety of inflammatory diseases and cancer. Cancer development is a multistep process where normal cells acquire qualities that enable the cells to proliferate continuously and migrate to distant sites in the human body. Drugs that interfere with this process are considered potential anti-cancer therapeutics, which may ultimately result in their clinical usage...
November 18, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/29161495/essential-oils-and-their-components-as-an-alternative-in-the-control-of-mosquito-vectors-of-disease
#6
Sergio Andrade Ochoa, Luvia E Sánchez-Torres, Guadalupe Virginia Nevárez-Moorillón, Alejandro D Camacho, Benjamín Nogueda-Torres
More than half of the human population is exposed to mosquito-borne infections. Climate change and the emergence of strains resistant to traditionally used insecticides have motivated the search of new agents for mosquito population control. Essential oils have been effective repellents and larvicidal agents.The aim of this work was to review research studies conducted in recent years on the larvicidal activity of essential oils and their components against Aedes, Anopheles and Culex mosquitoes, as well as the latest reports about their possible mechanism of action...
March 29, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/29161477/-insecticidal-action-of-synthetic-girgensohnine-analogues-and-essential-oils-on-rhodnius-prolixus-hemiptera-reduviidae
#7
Juliana Cuadros, Aurora L Carreño, Vladimir V Kouznetsov, Jonny E Duque
INTRODUCTION: The alkaloid girgensohnine has been used as a natural model in the synthesis of new alkaloid-like alpha-aminonitriles with insecticidal effect against disease vectors. OBJECTIVE: To evaluate the biocide activity of girgensohnine analogues and essential oils of Cymbopogon flexuosus, Citrus sinensis and Eucalyptus citriodora in stage I and stage V Rhodnius prolixus nymphs. MATERIALS AND METHODS: We used a topical application model in tergites and sternites, as well as exposure to treated surfaces with different exploratory doses of each of the molecules and essential oils to determine the lethal doses (LD50 and LD95)...
March 29, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/29161196/emergence-of-mixed-oil-fat-emulsions-for-use-in-parenteral-nutrition
#8
Manpreet S Mundi, Robert Martindale, Ryan T Hurt
Since early work by Wretlind and Schuberth led to the development of a stable and safe intravenous fat emulsion (IFE) using soybean oil (SO) and egg phospholipid emulsifier, IFEs have become a crucial source of essential fatty acids and nonprotein energy in parenteral nutrition. However, largely due to their high ω-6 polyunsaturated fatty acid (PUFA) and phytosterol content, SO IFEs have been associated with complications, including a proinflammatory profile and hypertriglyceridemia, as well as intestinal failure-associated liver disease...
November 1, 2017: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29160036/alternative-control-of-aedes-aegypti-resistant-to-pyrethroids-lethal-and-sublethal-effects-of-monoterpenes-bioinsecticides
#9
Indira M A Silva, Gustavo F Martins, Carlisson R Melo, Alisson S Santana, Ruan R N Faro, Arie F Blank, Péricles B Alves, Marcelo C Picanço, Paulo F Cristaldo, Ana Paula A Araújo, Leandro Bacci
BACKGROUND: The mosquito Aedes aegypti is intensely controlled because it is vector of viruses that cause innumerous diseases, especially in tropical regions. Due to the indiscriminate use of insecticides, populations from different regions have been resistant to pyrethroids. Here, we analyzed the lethal and sublethal effects of essential oil of Aristolochia trilobata and its major compounds on A. aegypti from susceptible and pyrethroid resistant populations. RESULTS: Our results showed that the toxicity and behavioral changes to different compounds are dependent of the stage of the insect life cycle...
November 21, 2017: Pest Management Science
https://www.readbyqxmd.com/read/29159692/germacrone-and-sesquiterpene-enriched-extracts-from%C3%A2-curcuma-aeruginosa-roxb-increase-skin-penetration-of-minoxidil-a-hair-growth-promoter
#10
Jukkarin Srivilai, Neti Waranuch, Anothai Tangsumranjit, Nantaka Khorana, Kornkanok Ingkaninan
Minoxidil is approved for topical treatment of androgenic alopecia but hampered by poor cutaneous absorption. Recently, the randomized control trial showed that hair loss treatment of minoxidil was improved by co-application of the anti-androgen, Curcuma aeruginosa Roxb. extract. Here, we aimed to show that the apparent synergism arises from improved cutaneous penetration of minoxidil by bioactive compound, germacrone or C. aeruginosa (as an n-hexane extract, or essential oil). The partition coefficient of germacrone was determined by HPLC...
November 20, 2017: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/29159502/antifungal-activity-of-myrtus-communis-against-malassezia-sp-isolated-from-the-skin-of-patients-with-pityriasis-versicolor
#11
Aleksandra Barac, Matthew Donadu, Donatella Usai, Vesna Tomic Spiric, Vittorio Mazzarello, Stefania Zanetti, Ema Nikolic, Goran Stevanovic, Natasa Popovic, Salvatore Rubino
The increasing incidence of fungal infections and antifungal resistance has prompted the search for novel antifungal drugs and alternative agents. We explored the antifungal activity of Myrtus communis essential oil (EO) against Malassezia sp. isolated from the skin of patients with pityriasis versicolor. These broad-spectrum antimicrobial activities of M. communis EO and its potent inhibiting activity on Malassezia growth deserve further research with aim to considerate this EO as candidate for topical use in treatment of skin diseases...
November 20, 2017: Infection
https://www.readbyqxmd.com/read/29157963/penta-block-copolymer-microspheres-impact-of-polymer-characteristics-and-process-parameters-on-protein-release
#12
Minh-Quan Le, Fabien Violet, Cédric Paniagua, Xavier Garric, Marie-Claire Venier-Julienne
Here, we aimed to develop protein loaded microspheres (MSs) using penta-block PLGA-based copolymers to obtain sustained and complete protein release. We varied MS morphology and studied the control of protein release. Lysozyme was used as a model protein and MSs were prepared using the solid-in-oil-in-water emulsion solvent extraction method. We synthesized and studied various penta-block PLGA-based copolymers. Copolymer characteristics (LA/GA ratio and molecular weight of PLGA blocks) influenced MS morphology...
November 17, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29157833/vasodilatory-effect-of-asafoetida-essential-oil-on-rat-aorta-rings-the-role-of-nitric-oxide-prostacyclin-and-calcium-channels
#13
Hassan Esmaeili, Mozhdeh Sharifi, Mansour Esmailidehaj, Mohammad Ebrahim Rezvani, Zeynab Hafizibarjin
BACKGROUND: Asafoetida is an oleo-gum resin mainly obtained from Ferula assa-foetida L. species in the apiaceae family. Previous studies have shown that it has antispasmodic effects on rat's and pig's ileums. PURPOSE: The main goals of this study were to assess the vasodilatory effect of asafoetida essential oil (AEO) on the contractile response of rat's aorta rings and to find the role of nitric oxide, cyclooxygenase, and calcium channels. Thoracic aorta rings were stretched under a steady-state tension of 1 g in an organ bath apparatus for 1 h and then precontracted by KCl (80 mM) in the presence and absence of AEO...
December 1, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29157605/extraction-of-essential-oil-from-bunium-persicum-boiss-by-instant-controlled-pressure-drop-dic
#14
Elnaz Feyzi, Mohammad H Eikani, Fereshteh Golmohammad, Bahram Tafaghodinia
Essential oils extraction from Bunium Persicum (Boiss) was performed using instant controlled pressure drop (in French: Détente Instantanée Contrôlée or DIC) thechnology and optimum extraction conditions were obtained. Response surface methodology (RSM) was used to determine the optimal conditions and the results were 20s heating time, 3.5bar pressure, 0.44mm particle diameter and 9 cycles. Essential oils extraction was also compared with Hydrodistillation (HD), ultrasound-assisted extraction (UAE) and Soxhlet (SOX) extraction...
November 15, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29155570/chemistry-antimicrobial-mechanisms-and-antibiotic-activities-of-cinnamaldehyde-against-pathogenic-bacteria-in-animal-feeds-and-human-foods
#15
Mendel Friedman
Cinnamaldehyde is a major constituent of cinnamon essential oils produced by aromatic cinnamon plants. This compound has been reported to exhibit antimicrobial properties in vitro in laboratory media and in animal feeds and human foods contaminated with disease-causing bacteria including Bacillus cereus, Campylobacter jejuni, Clostridium perfringens, Escherichia coli, Listeria monocytogenes, and Salmonella enterica. This integrated review surveys and interprets our current knowledge of the chemistry, analysis, safety, mechanism of action, and antibiotic activities of cinnamaldehyde in food animal (cattle, lambs, calves, pigs, poultry) diets and in widely consumed liquid (apple, carrot, tomato, and watermelon juices, milk) and solid foods...
November 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29155281/effect-of-oregano-essential-oil-and-carvacrol-on-cryptosporidium-parvum-infectivity-in-hct-8-cells
#16
Shashank Gaur, Theresa B Kuhlenschmidt, Mark S Kuhlenschmidt, Juan E Andrade
Cryptosporidium parvum is the second leading cause of persistent diarrhea among children in low-resource settings. This study examined the effect of oregano essential oil (OEO) and carvacrol (CV) on inhibition of C. parvum infectivity in vitro. HCT-8 cells were seeded (1×10(6)) in 96-well microtiter plates until confluency. Cell viability and infectivity were assessed by seeding HCT-8 cell monolayers with C. parvum oocysts (1×10(4)) in two modalities: 1) 4h co-culture with bioactive (0-250μg/mL) followed by washing and incubation (48h, 37°C, 5% CO2) in bioactive-free media; and 2) 4h co-culture of C...
November 15, 2017: Parasitology International
https://www.readbyqxmd.com/read/29155200/recent-advances-on-polysaccharides-lipids-and-protein-based-edible-films-and-coatings-a-review
#17
REVIEW
Bilal Hassan, Shahzad Ali Shahid Chatha, Abdullah Ijaz Hussain, Khalid Mahmood Zia, Naseem Akhtar
Food is a vital product for the survival of human beings and with passage of time quality concerns of consumers are rising. Edible films and coatings are thin layers applied on food products to protect them and improve their quality. Films/coatings are prepared from naturally occurring renewable sources (polysaccharides, proteins, lipids and composites) which we can eat without disposing them. These films are environment friendly and contain antioxidants, anti-browning agents and colorants. Various methods (spraying, brushing, electro-spraying) are used to apply a coating on food material to protect them from microbial growth, prolonging their shelf life and improving other quality aspects like sensory attributes, appearance, originality and freshness of ingredients...
November 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29154719/effect-of-citrus-reticulata-blanco-essential-oil-on-cryptolestes-ferrugineus-stephens-adults
#18
Jianhua Lü
The rusty grain beetle, Cryptolestes ferrugineus (Stephens), is a major insect pest of stored products worldwide. In an effort to manage populations of C. ferrugineus in stored grains, the essential oil from Citrus reticulata Blanco peel was prepared by the Soxhlet method with anhydrous diethyl ether, and its contact activity, repellent activity, and fumigant activity were investigated against C. ferrugineus adults. C. reticulata peel essential oil had potent contact, repellent, and fumigant activity against C...
November 20, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29152837/effect-of-nanoliposomes-containing-zataria-multiflora-boiss-essential-oil-on-gene-expression-of-shiga-toxin-2-in-escherichia-coli-o157-h7
#19
Seyed Amin Khatibi, Ali Misaghi, Mir-Hassan Moosavy, Afshin Akhondzadeh Basti, Samira Mohamadian, Ali Khanjari
AIMS: Enterohaemorrhagic Escherichia coli (EHEC) serotype O157:H7 as a major human pathogen is responsible for food borne outbreaks, bloody diarrhea, hemorrhagic colitis and hemolytic uremic syndrome (HUS) and even death. In this study, the antibacterial activity of the Zataria multiflora essential oil (ZMEO) and nanoliposome-encapsulated ZMEO was evaluated on the pathogenicity of Escherichia coli O157:H7. METHODS AND RESULTS: The minimum inhibitory concentrations (MIC) of essential oil (EO) were determined against the bacterium before and after encapsulation into nanoliposome...
November 20, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29152691/strategies-for-the-control-of-rhipicephalus-microplus-ticks-in-a-world-of-conventional-acaricide-and-macrocyclic-lactone-resistance
#20
REVIEW
Roger I Rodriguez-Vivas, Nicholas N Jonsson, Chandra Bhushan
Infestations with the cattle tick, Rhipicephalus microplus, constitute the most important ectoparasite problem for cattle production in tropical and subtropical regions worldwide, resulting in major economic losses. The control of R. microplus is mostly based on the use of conventional acaricides and macrocyclic lactones. However, the intensive use of such compounds has resulted in tick populations that exhibit resistance to all major acaricide chemical classes. Consequently, there is a need for the development of alternative approaches, possibly including the use of animal husbandry practices, synergized pesticides, rotation of acaricides, pesticide mixture formulations, manual removal of ticks, selection for host resistance, nutritional management, release of sterile male hybrids, environmental management, plant species that are unfavourable to ticks, pasture management, plant extracts, essential oils and vaccination...
November 20, 2017: Parasitology Research
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