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https://www.readbyqxmd.com/read/29342972/the-effect-of-combining-natural-terpenes-and-antituberculous-agents-against-reference-and-clinical-mycobacterium-tuberculosis-strains
#1
Elwira Sieniawska, Rafal Sawicki, Marta Swatko-Ossor, Agnieszka Napiorkowska, Agata Przekora, Grazyna Ginalska, Ewa Augustynowicz-Kopec
Background: On account of emergence of multi- and extensively drug-resistant Mycobacterium tuberculosis (Mtb) strains, combinations of drugs with natural compounds were tested to search for antibiotic activity enhancers. In this work we studied terpenes (α-pinene, bisabolol, β-elemene, (R)-limonene, (S)-limonene, myrcene, sabinene), which are the main constituents of essential oil obtained from Mutellina purpurea L., a plant with described antitubercular activity, to investigate their interactions with antibiotics against reference Mtb strains and multidrug-resistant clinical isolates...
January 15, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29341260/essential-oils-improved-weight-gain-growth-and-feed-efficiency-of-young-dairy-calves-fed-18-or-20-crude-protein-starter-diets
#2
M Kazemi-Bonchenari, R Falahati, M Poorhamdollah, S R Heidari, A Pezeshki
The objective was to evaluate interactions between starter protein (180 vs. 200 g/kg, DM basis) and a mixture of essential oils (EOs; containing thymol, eugenol, vanillin, limonene and guaiacol) on growth, metabolic and ruminal functions of Holstein dairy calves. In a completely randomized 2 × 2 factorial design, 48 calves, 3 days old (averaging BW 42.7 ± 1.9 kg), were allocated into groups fed the following diets: (i) 180 g/kg CP with no EO (180P-NEO); (ii) 180 g/kg CP with EO (180P-EO); (iii) 200 g/kg CP with no EO (200P-NEO); and (iv) 200 g/kg CP with EO (200P-EO)...
January 17, 2018: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/29331510/effects-of-sub-minimum-inhibitory-concentrations-of-lemon-essential-oil-on-the-acid-tolerance-and-biofilm-formation-of-streptococcus-mutans
#3
Yanwei Sun, Sijia Chen, Chen Zhang, Yali Liu, Li Ma, Xiangyu Zhang
OBJECTIVES: Lemon essential oil (LEO) is a kind of secondary metabolite from lemon peels and has been found to inhibit cariogenic bacteria for decades. However, its effects on main cariogenic virulence factors are rarely reported. The present study aimed to investigate the effects of sub-minimum inhibitory concentrations (sub-MICs) of LEO on the acid tolerance and biofilm formation of Streptococcus mutans (S. mutans) and preliminarily reveal the possible underlying mechanisms. DESIGNS: Effects of LEO on the acid tolerance and biofilm formation of S...
December 29, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29323370/photocatalytic-partial-oxidation-of-limonene-to-1-2-limonene-oxide
#4
Rosaria Ciriminna, Francesco Parrino, Claudio De Pasquale, Leonardo Palmisano, Mario Pagliaro
The silylation of crystalline TiO2 P25, commonly used for photocatalytic degradation of pollutants, results in an exceptionally selective catalyst for the aerobic limonene epoxidation to 1,2-limonene oxide under solar light irradiation. The hypothesized mechanism involves the singlet oxygen generated through energy transfer from the excited TiO2 to adsorbed O2 molecules. The reaction product is the valued precursor of bio-based poly(limonene carbonate), a thermoplastic polymer of superior thermal and optical properties whose industrial production is in need of an efficient green synthesis of limonene oxide...
January 11, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29322829/chemical-composition-and-antimicrobial-activity-of-the-essential-oils-from-flowers-and-leaves-of-grindelia-integrifolia-dc
#5
Sławomira Nowak, Paweł Lisiecki, Anna Tomaszczak-Nowak, Ewa Grudzińska, Monika Anna Olszewska, Agnieszka Kicel
Essential oils from flowers and leaves of Grindelia integrifolia DC. were investigated for the first time in terms of chemical composition and antimicrobial activity. The GC-FID/MS analysis allowed for the identification of 58 and 72 volatiles, comprising 92.4 and 90.1% of the oils, respectively. The major components of the flower oil were α-pinene (34.9%) and limonene (13.1%), while myrcene (16.9%), spathulenol (12.3%), β-eudesmol (11.9%) and limonene (10.1%) dominated among the leaf volatiles. The antimicrobial activity, evaluated against 12 selected bacteria and fungus, was found moderate, with the strongest effect of both oils observed against C...
January 11, 2018: Natural Product Research
https://www.readbyqxmd.com/read/29306026/differential-regulation-of-tefluthrin-and-telmisartan-on-the-gating-charges-of-ina-activation-and-inactivation-as-well-as-on-resurgent-and-persistent-ina-in-a-pituitary-cell-line-gh3
#6
Edmund Cheung So, Sheng-Nan Wu, Yi-Ching Lo, Kevin Su
Voltage-gated Na+ currents (INa), known to contain many components (e.g., transient, resurgent and persistent INa) with unique gating properties, are involved in the generation and propagation of action potentials in excitable cells. In this study, how tefluthrin (Tef), a synthetic pyrethoid, and telmisartan (TEL), blocker of angiotensin II receptors can perturb those components of INa was investigated. The presence of either Tef or TEL increased the values of the gating charges of INa involved in the activation (za) and inactivation (za)...
January 3, 2018: Toxicology Letters
https://www.readbyqxmd.com/read/29304179/thymus-mastichina-l-essential-oils-from-murcia-spain-composition-and-antioxidant-antienzymatic-and-antimicrobial-bioactivities
#7
Ana-Belen Cutillas, Alejandro Carrasco, Ramiro Martinez-Gutierrez, Virginia Tomas, Jose Tudela
The compositions of essential oils (EOs) from Spanish marjoram (Thymus mastichina L.) grown in several bioclimatic zones of Murcia (SE Spain) were studied to determine their absolute and relative concentrations using gas chromatography-mass spectrometry. 1,8-Cineole and linalool were the main components, followed by α-pinene, β-pinene and α-terpineol. (-)-Linalool, (+)-α-terpineol and (+)-α-pinene were the most abundant enantiomers. When the antioxidant capacities of T. mastichina EOs and their compounds were measured by five methods, EOs and linalool, linalyl acetate, α-terpinene and γ-terpinene, among others, showed antioxidant activities...
2018: PloS One
https://www.readbyqxmd.com/read/29303269/tunable-d-limonene-permeability-in-starch-based-nanocomposite-films-reinforced-by-cellulose-nanocrystals
#8
Siyuan Liu, Xiaoxi Li, Ling Chen, Lin Li, Bing Li, Jie Zhu
In order to control d-limonene permeability, the cellulose nanocrystals (CNC) were used to regulate starch-based film multi-scale structures. The effect of sphere-like cellulose nanocrystal (CS) and rod-like cellulose nanocrystal (CR) on starch molecular interaction, short-range molecular conformation, crystalline structure and micro-ordered aggregated region structure were systematically discussed. CNC aspect ratio and content were proved to be independent variables to control d-limonene permeability via film structures regulation...
January 5, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29300393/-comparison-of-chemical-composition-of-selected-essential-oils-used-in-respiratory-diseases
#9
Małgorzata Kucharska, Jadwiga A Szymańska, Wiktor Wesołowski, Elżbieta Bruchajzer, Barbara Frydrych
BACKGROUND: Essential oils are fragrances extracted from plants. They have a smooth consistency and pleasant smell. Essential oils have been applied in aromatherapy, cosmetics, food and pharmaceutical products. The aim of the study was to analyze the composition of selected essential oils used in respiratory diseases. MATERIAL AND METHODS: The qualitative analysis was performed by gas chromatography with mass spectrometry. For the study 6 essential oils available in Polish shops and used in various respiratory diseases were chosen...
December 19, 2017: Medycyna Pracy
https://www.readbyqxmd.com/read/29288759/the-frequently-occurring-components-of-essential-oils-beta-elemene-and-r-limonene-alter-expression-of-dpre1-and-clgr-genes-of-mycobacterium-tuberculosis-h37ra
#10
Rafal Sawicki, Elwira Sieniawska, Marta Swatko-Ossor, Joanna Golus, Grazyna Ginalska
In the past few years, there has been a significant increase in detection of drug resistant strains of Mycobacterium tuberculosis. Search for new antimycobacterial drugs brought natural sources with their chemical diversity in focus. Especially essential oils, produced by plants also for toxic effect, are reservoir of potentially antitubercular compounds. In the present work, we exposed M. tuberculosis H37Ra ATCC 25177 strain to some terpenes commonly occurring in essential oils. Gene expression profiling was used to explore possible influence of these compounds on stress sensing and envelope preserving function...
December 27, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29288755/essential-oil-of-citrus-lumia-risso-phytochemical-profile-antioxidant-properties-and-activity-on-the-central-nervous-system
#11
Antonella Smeriglio, Susanna Alloisio, Francesco Maria Raimondo, Marcella Denaro, Jianbo Xiao, Laura Cornara, Domenico Trombetta
The use of essential oils (EOs) is known since long time in traditional medicine and aromatherapy for the management of various oxidative stress-related disorders and has been further increased recently for their neuroprotective and anti-aging potentials as well as for reducing anxiety and stress. The purpose of this work was to evaluate, for the first time, the chemical composition of Citrus lumia Risso EO and its antioxidant, anti-cholinesterase, and neuroactive properties by cell-free and cell-based assays...
December 27, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29288353/monoterpene-biotransformation-by-colletotrichum-species
#12
Adones Sales, Luana Ferreira Afonso, Juliana Alves Americo, Mauro de Freitas Rebelo, Glaucia Maria Pastore, Juliano Lemos Bicas
OBJECTIVE: To investigate the biocatalytic potential of Colletotrichum acutatum and Colletotrichum nymphaeae for monoterpene biotransformation. RESULTS: C. acutatum and C. nymphaeae used limonene, α-pinene, β-pinene, farnesene, citronellol, linalool, geraniol, perillyl alcohol, and carveol as sole carbon and energy sources. Both species biotransformed limonene and linalool, accumulating limonene-1,2-diol and linalool oxides, respectively. α-Pinene was only biotransformed by C...
December 29, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/29280145/comparative-analysis-of-volatile-compound-profiles-of-propolis-from-different-provenances
#13
Lina G Mohtar, Sergio A Rodríguez, Mónica A Nazareno
BACKGROUND: Propolis is a complex mixture that honey bees produce from the exudates of various plants and presents many medicinal properties. Its chemical compositions varies according to the phytogeography characteristics of each region, among others. The aim of this study was to identify and characterize the volatile organic compounds (VOCs) present in Venezuelan propolis and compare with reference samples such as Brazilian and Argentinian ones. RESULTS: A total of 90 VOCs were identified in a series of propolis samples using both Solid-Phase Microextraction (SPME) and Dynamic Headspace (DHS), both coupled to C-EI-MS...
December 27, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29277112/exploring-of-bioactive-compounds-in-essential-oil-acquired-from-the-stem-and-root-derivatives-of-hypericum-triquetrifolium-callus-cultures
#14
Nawroz Abdul-Razzak Tahir, Hoshyar Abdullah Azeez, Kadhm Abdullah Muhammad, Shewa Anwer Faqe, Dlshad Ali Omer
The chemical profile of the essential oil of callus and cell suspension cultures derivatives from stem and root of Hypericum triquetrifolium were explored by ITEX/GC-MS. The major constituents for stem derivatives were undecane (78.44%) and 2,4,6-trimethyl-octane (9.74%) for fresh calli, 2,4-dimethyl-benzaldehyde (46.94%), 2,3-dimethyl-undecane (28.39%), 2,4-dimethyl-1-hexene (10.17%), 1,2-oxolinalool (3.64%) and limonene (3.55%) for dry calli and undecane (61.24%), octane, 2,4,6-trimethyl- (16.73%), nonane, 3-methyl-(3...
December 25, 2017: Natural Product Research
https://www.readbyqxmd.com/read/29274826/structure-activity-modelling-of-essential-oils-their-components-and-key-molecular-parameters-and-descriptors
#15
Lucy Owen, Katie Laird, Philippe B Wilson
Many essential oil components are known to possess broad spectrum antimicrobial activity, including against antibiotic resistant bacteria. These compounds may be a useful source of new and novel antimicrobials. However, there is limited research on the structure-activity relationship (SAR) of essential oil compounds, which is important for target identification and lead optimization. This study aimed to elucidate SARs of essential oil components from experimental and literature sources. Minimum Inhibitory Concentrations (MICs) of essential oil components were determined against Escherichia coli and Staphylococcus aureus using a microdilution method and then compared to those in published in literature...
December 21, 2017: Molecular and Cellular Probes
https://www.readbyqxmd.com/read/29251412/antifibrotic-effects-of-d-limonene-5-1-methyl-4-1-methylethenyl-cyclohexane-in-ccl4-induced-liver-toxicity-in-wistar-rats
#16
Sheikh Bilal Ahmad, Muneeb U Rehman, Bilques Fatima, Bilal Ahmad, Ishraq Hussain, Sheikh Pervaiz Ahmad, Adil Farooq, Showkeen Muzamil, Rahil Razzaq, Shahzada Mudasir Rashid, Showkat Ahmad Bhat, Manzoor Ur Rahman Mir
This study was designed to assess the potential antifibrotic effect of D-Limonene-a component of volatile oils extracted from citrus plants. D-limonene is reported to have numerous therapeutic properties. CCl4 -intduced model of liver fibrosis in Wistar rats is most widely used model to study chemopreventive studies. CCl4 -intoxication significantly increased serum aminotransferases and total cholesterol these effects were prevented by cotreatment with D-Limonene. Also, CCl4 -intoxication caused depletion of glutathione and other antioxidant enzymes while D-Limonene preserved them within normal values...
December 18, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/29250798/effects-of-microwave-assisted-hot-water-treatments-designed-against-mexican-fruit-fly-anastrepha-ludens-on-grapefruit-citrus-paradisi-quality
#17
Nohemi Soto-Reyes, Aurelio Lopez-Malo, Roberto Rojas-Laguna, Julián Andrés Gómez-Salazar, María Elena Sosa-Morales
BACKGROUND: Hot water treatment (HWT) against Anastrepha ludens were developed achieving 48°C in the core of grapefruits and holding it for 6 min. After heating, the grapefruits were hydro-cooled and stored at 23°C and analyzed for 16 days. The effect of microwave-assisted hot water treatment (MW-HWT) on grapefruit quality was analyzed and compared with the quality of fruits treated with HWT and control fruits (without treatment). The physico-chemical properties and chemical composition of essential oil were analyzed...
December 18, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29238032/influence-of-fruit-ripening-on-color-organic-acid-contents-capsaicinoids-aroma-compounds-and-antioxidant-capacity-of-shimatogarashi-capsicum-frutescens
#18
Manikharda Manikharda, Makoto Takahashi, Mika Arakaki, Kaoru Yonamine, Fumio Hashimoto, Kensaku Takara, Koji Wada
Shimatogarashi (Capsicum frutescens) is a typical chili pepper domesticated in southern Japan. Important traits of Shimatogarashi peppers, such as color; proportion of organic acids, capsaicinoids, and aromatic compounds; and antioxidant activity in three stages of maturity (green (immature), orange (turning), and red (mature) stages) were characterized. The results indicated that the concentration of organic acids, including ascorbic, citric, and malic acid, increased during ripening. In addition, the amount of capsaicinoids, which are responsible for the pungent taste of chili peppers, increased as the fruit matured to the orange and red stages...
December 14, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/29237265/differentiation-between-the-flavors-of-sweet-orange-citrus-sinensis-and-mandarin-citrus-reticulata
#19
Shi Feng, Joon Hyuk Suh, Fred G Gmitter, Yu Wang
Pioneering investigations referring to citrus flavor have been intensively conducted. However, the characteristic flavor difference between sweet orange and mandarin has not been defined. In this study, sensory analysis illustrated the crucial role of aroma in the differentiation between orange flavor and mandarin flavor. To study aroma, Valencia orange and LB8-9 mandarin were used. Their most aroma-active compounds were preliminarily identified by aroma extract dilution analysis (AEDA). Quantification of key volatiles followed by calculation of odor activity values (OAVs) further detected potent components (OAV≥1) impacting the overall aromatic profile of orange/mandarin...
December 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29235513/metabolic-engineering-of-the-pentose-phosphate-pathway-for-enhanced-limonene-production-in-the-cyanobacterium-synechocysti-s-sp-pcc-6803
#20
Po-Cheng Lin, Rajib Saha, Fuzhong Zhang, Himadri B Pakrasi
Isoprenoids are diverse natural compounds, which have various applications as pharmaceuticals, fragrances, and solvents. The low yield of isoprenoids in plants makes them difficult for cost-effective production, and chemical synthesis of complex isoprenoids is impractical. Microbial production of isoprenoids has been considered as a promising approach to increase the yield. In this study, we engineered the model cyanobacterium Synechocystis sp. PCC 6803 for sustainable production of a commercially valuable isoprenoid, limonene...
December 13, 2017: Scientific Reports
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