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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/28428873/a-maize-landrace-that-emits-defense-volatiles-in-response-to%C3%A2-herbivore-eggs-possesses-a-strongly-inducible-terpene-synthase-gene
#2
Amanuel Tamiru, Toby J A Bruce, Annett Richter, Christine M Woodcock, Charles A O Midega, Jörg Degenhardt, Segenet Kelemu, John A Pickett, Zeyaur R Khan
Maize (Zea mays) emits volatile terpenes in response to insect feeding and egg deposition to defend itself against harmful pests. However, maize cultivars differ strongly in their ability to produce the defense signal. To further understand the agroecological role and underlying genetic mechanisms for variation in terpene emission among maize cultivars, we studied the production of an important signaling component (E)-caryophyllene in a South American maize landrace Braz1006 possessing stemborer Chilo partellus egg inducible defense trait, in comparison with the European maize line Delprim and North American inbred line B73...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28427280/progress-in-terpene-synthesis-strategies-through-engineering-of-saccharomyces-cerevisiae
#3
Kalaivani Paramasivan, Sarma Mutturi
Terpenes are natural products with a remarkable diversity in their chemical structures and they hold a significant market share commercially owing to their distinct applications. These potential molecules are usually derived from terrestrial plants, marine and microbial sources. In vitro production of terpenes using plant tissue culture and plant metabolic engineering, although receiving some success, the complexity in downstream processing because of the interference of phenolics and product commercialization due to regulations that are significant concerns...
April 20, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28427010/leveraging-microbial-biosynthetic-pathways-for-the-generation-of-drop-in-biofuels
#4
REVIEW
Amin Zargar, Constance B Bailey, Robert W Haushalter, Christopher B Eiben, Leonard Katz, Jay D Keasling
Advances in retooling microorganisms have enabled bioproduction of 'drop-in' biofuels, fuels that are compatible with existing spark-ignition, compression-ignition, and gas-turbine engines. As the majority of petroleum consumption in the United States consists of gasoline (47%), diesel fuel and heating oil (21%), and jet fuel (8%), 'drop-in' biofuels that replace these petrochemical sources are particularly attractive. In this review, we discuss the application of aldehyde decarbonylases to produce gasoline substitutes from fatty acid products, a recently crystallized reductase that could hydrogenate jet fuel precursors from terpene synthases, and the exquisite control of polyketide synthases to produce biofuels with desired physical properties (e...
April 17, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28426156/natural-terpene-derivatives-as-new-structural-task-specific-ionic-liquids-to-enhance-the-enantiorecognition-of-acidic-enantiomers-on-teicoplanin-based-stationary-phase-by-high-performance-liquid-chromatography
#5
Jolanta Flieger, Joanna Feder-Kubis, Małgorzata Tatarczak-Michalewska, Anita Płazińska, Anna Madejska, Marta Swatko-Ossor
We present the specific cooperative effect of a semisynthetic glycopeptide antibiotic teicoplanin and chiral ionic liquids containing the (1R,2S,5R)-(-)-menthol moiety on the chiral recognition of enantiomers of mandelic acid, vanilmandelic acid and phenyllactic acid. Experiments were performed chromatographically on an Astec Chirobiotic T chiral stationary phase applying the mobile phase with the addition of the chiral ionic liquids. The stereoselective binding of enantiomers to teicoplanin in presence of new chiral ionic liquids were evaluated applying thermodynamic measurements and the docking simulations...
April 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28421748/potential-contribution-of-fish-feed-and-phytoplankton-to-content-of-volatile-terpenes-in-cultured-pangasius-pangasianodon-hypophthalmus-and-tilapia-oreochromis-niloticus
#6
Raju Podduturi, Mikael Agerlin Petersen, Sultan Mahmud, Md Mizanur Rahman, Niels O G Jørgensen
Geosmin and 2-methylisoborneol are the most recognized off-flavors in freshwater fish, but terpenes may also contribute off-flavor in fish. We identified six monoterpenes, 11 sesquiterpenes and three terpene-related compounds in pangasius and tilapia from aquaculture farms in Bangladesh. Concentrations of most of the volatiles were below published odor thresholds, except for α-pinene, limonene, β-caryophyllene, α-humulene and β-ionone in tilapia, and limonene and β-ionone in pangasius. To identify sources of the terpenes, terpene profiles of fish feed and phytoplankton in the ponds were analyzed...
April 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28421412/bioactive-compounds-and-antioxidant-activity-exhibit-high-intraspecific-variability-in-pleurotus-ostreatus-mushrooms-and-correlate-well-with-cultivation-performance-parameters
#7
Georgios Koutrotsios, Nick Kalogeropoulos, Pantelis Stathopoulos, Andriana C Kaliora, Georgios I Zervakis
Experimental data related with oyster mushroom production and nutritional properties usually derive from the examination of only one strain, and hence their representativeness/usefulness is questionable. This work aims at assessing intraspecific variability in Pleurotus ostreatus by studying 16 strains, under the same conditions, in respect to essential cultivation and mushroom quality aspects, and by defining the impact of intrinsic/genetic factors on such parameters. Hence, mushroom yield, earliness, crop length, biological efficiency, productivity, and their content in selected macro and microconstituents (e...
May 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28418649/nature-s-selection-of-geranyl-group-as-a-trna-modification-the-effects-of-chain-length-on-base-pairing-specificity
#8
Phensinee Haruehanroengra, Sweta Vangaveti, Srivathsan V Ranganathan, Rui Wang, Alan Chen, Jia Sheng
The recently discovered geranyl modification on the 2-thio position of wobble U34 residues in tRNA(Glu), tRNA(Lys), and tRNA(Gln) in several bacteria has been found to enhance the U:G pairing specificity and reduce the frameshifting error during translation. It is a fundamentally interesting question why nature chose a C10 terpene group in tRNA systems. In this study, we explore the significance of the terpene length on base-paring stability and specificity using a series of 2-thiouridine analogues containing different lengths of carbon chains, namely, methyl- (C1), dimethylallyl- (C5), and farnesyl-modified (C15) 2-thiothymidines in a DNA duplex...
April 18, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28418581/leaf-rust-infection-reduces-herbivore-induced-volatile-emission-in-black-poplar-and-attracts-a-generalist-herbivore
#9
Franziska Eberl, Almuth Hammerbacher, Jonathan Gershenzon, Sybille B Unsicker
Plants release complex volatile blends after separate attack by herbivores and pathogens, which play many roles in interactions with other organisms. Large perennials are often attacked by multiple enemies, but the effect of combined attacks on volatile emission is rarely studied, particularly in trees. We infested Populus nigra trees with a pathogen, the rust fungus Melampsora larici-populina, and Lymantria dispar caterpillars alone and in combination. We investigated poplar volatile emission and its regulation, as well as the behavior of the caterpillars towards volatiles from rust-infected and uninfected trees...
April 18, 2017: New Phytologist
https://www.readbyqxmd.com/read/28413958/anti-fatigue-effects-of-active-ingredients-from-traditional-chinese-medicine-a-review
#10
Si-Si Zhou, Jian-Guo Jiang
Fatigue, a phenomenon which is believed to be caused by body exercise, can lead to the failure of predetermined exercise intensity maintenance and sport ability declination. The usage of traditional Chinese medicine (TCM) in the treatment of fatigue has long been practiced in clinical and showed significant effects. This article covers related literatures in recent years and sorts the effective ingredients from TCM for treating fatigue into a few categories including alkaloids, saponins, polysaccharides, polyphenols, polypeptide, terpene, proteins and other active ingredients...
April 14, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28411017/biological-properties-of-propolis-extracts-something-new-from-an-ancient-product
#11
REVIEW
Nada Zabaiou, Allan Fouache, Amalia Trousson, Silvère Baron, Amar Zellagui, Mesbah Lahouel, Jean-Marc A Lobaccaro
Natural products are an interesting source of new therapeutics, especially for cancer therapy as 70% of them have botany origin. Propolis, a resinous mixture that honey bees collect and transform from tree buds, sap flows, or other botanical sources, has been used by ethnobotany and traditional practitioners as early in Egypt as 3000 BC. Enriched in flavonoids, phenol acids and terpene derivatives, propolis has been widely used for its antibacterial, antifungal and anti-inflammatory properties. Even though it is a challenge to standardize propolis composition, chemical analyses have pointed out interesting molecules that also present anti-oxidant and anti-proliferative properties that are of interest in the field of anti-cancer therapy...
April 11, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/28408760/fungal-volatile-compounds-induce-production-of-the-secondary-metabolite-sodorifen-in-serratia-plymuthica-pri-2c
#12
Ruth Schmidt, Victor de Jager, Daniela Zühlke, Christian Wolff, Jörg Bernhardt, Katarina Cankar, Jules Beekwilder, Wilfred van Ijcken, Frank Sleutels, Wietse de Boer, Katharina Riedel, Paolina Garbeva
The ability of bacteria and fungi to communicate with each other is a remarkable aspect of the microbial world. It is recognized that volatile organic compounds (VOCs) act as communication signals, however the molecular responses by bacteria to fungal VOCs remain unknown. Here we perform transcriptomics and proteomics analyses of Serratia plymuthica PRI-2C exposed to VOCs emitted by the fungal pathogen Fusarium culmorum. We find that the bacterium responds to fungal VOCs with changes in gene and protein expression related to motility, signal transduction, energy metabolism, cell envelope biogenesis, and secondary metabolite production...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28403553/highly-enantioselective-asymmetric-direct-aldol-reaction-promoted-by-aziridine-amides-constructed-on-chiral-terpene-scaffold
#13
Zuzanna Wujkowska, Aleksandra Strojewska, Adam M Pieczonka, Stanisław Leśniak, Michał Rachwalski
Optically pure, diastereomeric aziridine amides built on the chiral skeletons of camphor, fenchone, and menthone have proven to be highly efficient ligands for enantioselective asymmetric direct aldol reaction in the presence of water and zinc triflate. Desired products were formed in moderate to high chemical yields (up to 95%) and with enantiomeric excess up to 99%. The influence of the stereogenic centers located at the aziridine subunit on the stereochemical course of the reaction is discussed.
April 12, 2017: Chirality
https://www.readbyqxmd.com/read/28401286/identification-of-odorants-in-wood-of-calocedrus-decurrens-torr-florin-by-aroma-extract-dilution-analysis-and-two-dimensional-gas-chromatography-mass-spectrometry-olfactometry
#14
Linda Schreiner, Helene M Loos, Andrea Buettner
General emissions of volatile organic compounds from wood are well investigated, but only limited information is available on the odor-active substances contained therein. To close this gap, we aimed at specifically elucidating the odorous constituents of wood from incense cedar [Calocedrus decurrens (Torr.) Florin]; this material is commonly used for the production of a range of products such as pencils and interior accessories. Targeted odorant analysis requires specialized techniques combining modern odorant analytical tools with human-sensory evaluation...
April 11, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28400197/cutaneous-penetration-enhancing-effect-of-menthol-calcium-involvement
#15
Amit Joshi, Abhay Joshi, Hiren Patel, Dovenia Ponnoth, Grazia Stagni
Menthol is a naturally occurring terpene used as a penetration enhancer in topical and transdermal formulations. Literature shows a growing interest on menthol's interactions with the Transient-Receptor-Potential (TRPM-8) calcium channel. A decrease in extracellular Ca(+2) due to the activation of TRPM-8 channels produces inhibition of E-cadherin expression that is responsible for cell-cell adhesion. Since calcium is present in the entire epidermis, the purpose of this study is to evaluate whether the aforementioned properties of menthol are also related to its penetration-enhancing-effects...
April 8, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28399283/repellent-and-larvicidal-activity-of-the-essential-oil-from-eucalyptus-nitens-against-aedes-aegypti-and-aedes-albopictus-diptera-culicidae
#16
Agustín Alvarez Costa, Cecilia V Naspi, Alejandro Lucia, Héctor M Masuh
Dengue, chikungunya, and yellow fever are important vector-borne diseases transmitted by female mosquitoes when they feed on humans. The use of repellents based on natural products is an alternative for personal protection against these diseases. Application of chemicals with larvicidal activity is another strategy for controlling the mosquito population. The repellent and larvicidal activities of the essential oil from Eucalyptus nitens were tested against Aedes aegypti and Aedes albopictus, the main vectors of these arboviruses...
February 19, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28380413/antioxidant-and-selective-anticancer-activities-of-two-euphorbia-species-in-human-acute-myeloid-leukemia
#17
Soumaya Ben Jannet, Nolwenn Hymery, Soumaya Bourgou, Ahmed Jdey, Mokhtar Lachaal, Christian Magné, Riadh Ksouri
In this study, two Euphorbia species (i.e. terracina and paralias) were investigated for their cytotoxic and antioxidant activities. Cytotoxicity of plant methanol and chloroform fractions was examined towards human acute myeloid leukemia (THP1) and human colon epithelial (Caco2) cancer cell lines, as well as CD 14 and IEC-6 normal cells by targeting various modulators of apoptosis or inflammation. Moreover, secondary metabolite pools (phenolic classes, alkaloids, terpenes, saponins) and antioxidant activities (DPPH, ABTS and O2- scavenging, as well as FRAP tests) were assessed in plant extracts...
April 2, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28377794/antioxidant-cytotoxic-and-toxic-activities-of-propolis-from-two-native-bees-in-brazil-scaptotrigona-depilis-and-melipona-quadrifasciata-anthidioides
#18
Thaliny Bonamigo, Jaqueline Ferreira Campos, Tamaeh Monteiro Alfredo, José Benedito Perrella Balestieri, Claudia Andrea Lima Cardoso, Edgar Julian Paredes-Gamero, Kely de Picoli Souza, Edson Lucas Dos Santos
Propolis is a natural mixture of compounds produced by various bee species, including stingless bees. This compound has been shown to exhibit antioxidant, antiproliferative, and antitumor activities. The present study aimed to determine the chemical constituents as well as the antioxidant, cytotoxic, and toxic activities of ethanol extracts of propolis obtained from the stingless bees Scaptotrigona depilis and Melipona quadrifasciata anthidioides, which are found in Brazil. Phytosterols, terpenes, phenolic compounds, and tocopherol were identified in the ethanol extracts of propolis (EEPs) in different concentrations...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28376864/antiangiogenic-effects-of-oridonin
#19
Lili Tian, Kangjie Xie, Donglai Sheng, Xiaoqing Wan, Guofu Zhu
BACKGROUND: Oridonin, the major terpene found in Rabdosia rubescens (Henmsl.) Hara, is widely used as a dietary supplement and therapeutic drug. Oridonin has been proven to possess good anti-tumour activity, but little is known about its effect on angiogenesis. The aim of this study was to investigate the antiangiogenic effects of oridonin in vivo and in vitro and prove that oridonin anti-tumour activity is based on suppressing angiogenesis. METHODS: In vitro, the antiangiogenesis effect was studied by proliferation, apoptosis, migration, invasion, and tube formation experiments on human umbilical vascular endothelial cells (HUVECs)...
April 4, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28375628/designing-a-new-entry-point-into-isoprenoid-metabolism-by-exploiting-fructose-6-phosphate-aldolase-side-reactivity-of-escherichia-coli
#20
Jason R King, Benjamin Michael Woolston, Gregory Stephanopoulos
The 2C-methyl-D-erythritol 4-phosphate (MEP) pathway in Escherichia coli has been highlighted for its potential to provide access to myriad isoprenoid chemicals of industrial and therapeutic relevance and discover antibiotic targets to treat microbial human pathogens. Here, we describe a metabolic engineering strategy for the de novo construction of a biosynthetic pathway that produces 1-dexoxy-D-xylulose-5-phosphate (DXP), the precursor metabolite of the MEP pathway, from the simple and renewable starting materials D-arabinose and hydroxyacetone...
April 4, 2017: ACS Synthetic Biology
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