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https://www.readbyqxmd.com/read/29150804/using-citrus-aurantifolia-essential-oil-for-the-potential-biocontrol-of-colocasia-esculenta-taro-leaf-blight-caused-by-phytophthora-colocasiae
#1
Séverin Nguemezi Tchameni, Staelle Njamou Mbiakeu, Modeste Lambert Sameza, Pierre Michel Dongmo Jazet, François Tchoumbougnang
The aim of this work was to evaluate the antimicrobial activities of leaves and epicarp of Citrus aurantifolia essential oil against Phytophthora colocasiae, the causative agent of taro leaf blight. Oils were extracted by hydrodistillation, and their chemical composition was determined by gas chromatography and gas chromatography coupled with mass spectrometry. Antimicrobial activities of oils were tested in vitro against mycelium growth and sporangium production. In situ tests were done on healthy taro leaves, and the necrosis symptoms were evaluated...
November 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29149027/baccharis-reticularia-dc-and-limonene-nanoemulsions-promising-larvicidal-agents-for-aedes-aegypti-diptera-culicidae-control
#2
Gisele da S Botas, Rodrigo A S Cruz, Fernanda B de Almeida, Jonatas L Duarte, Raquel S Araújo, Raimundo Nonato P Souto, Ricardo Ferreira, José Carlos T Carvalho, Marcelo G Santos, Leandro Rocha, Vera Lúcia P Pereira, Caio P Fernandes
Baccharis reticularia DC. is a plant species from the Asteraceae family that is endemic to Brazil. Despite the great importance of Baccharis genus, no study has been carried out regarding either the phytochemical composition of B. reticularia or the evaluation of its larvicidal potential. Considering the intrinsic immiscibility of essential oils, this study shows larvicidal nanoemulsions containing the B. reticularia phytochemically characterized essential oil and its main constituent against Aedes aegypti...
November 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29148753/kinetics-of-the-aqueous-phase-reactions-of-atmospherically-relevant-monoterpene-epoxides
#3
Diego A Cortes, Matthew J Elrod
Laboratory and field measurements have demonstrated that an isoprene-derived epoxide intermediate (IEPOX) is the origin of a wide range of chemical species found in ambient secondary organic aerosol (SOA). In order to explore the potential relevance of a similar mechanism for the formation of monoterpene-derived SOA, nuclear magnetic resonance techniques were used to study kinetics and reaction products of the aqueous phase reactions of several monoterpene epoxides: β-pinene oxide, limonene oxide, and limonene dioxide...
November 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29146338/analysis-of-changes-in-volatile-constituents-and-expression-of-genes-involved-in-terpenoid-metabolism-in-oleocellosis-peel
#4
Jiao Xie, Lili Deng, Yahan Zhou, Shixiang Yao, Kaifang Zeng
Oleocellosis is a serious physiological disorder in citrus fruit that mainly results in appearance and quality deterioration. It has been well established that the occurrence of oleocellosis is highly correlated with the release of peel oil from citrus fruit, while there is little information on the dynamic changes in the content of the volatile constituents and the expression of genes involved in terpenoid metabolism during oleocellosis development. In the present research, large changes in the volatile profiles and gene expression in terpenoid metabolism were observed in oleocellosis peels compared to healthy ones...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29145138/exposure-to-selected-limonene-oxidation-products-4-opa-ipoh-4-amch-induces-oxidative-stress-and-inflammation-in-human-lung-epithelial-cell-lines
#5
Dorelia Lipsa, Josefa Barrero-Moreno, Mehmet Coelhan
Limonene oxidation products (LOPs) have gained interest on their harmful health effects over time. Recently, studies have shown that the selected LOPs: 4-oxopentanal (4-OPA), 3-isopropenyl-6-oxo-heptanal (IPOH) and 4-acetyl-1-methylcyclohexene (4-AMCH) have sensory irritation effects in mice and inflammatory effects in human lung cells. This study was therefore undertaken to investigate the potential capacity of 4-OPA, IPOH and 4-AMCH to cause cell membrane damage, oxidative stress and inflammation in human bronchial (16HBE14o-) and alveolar (A549) epithelial cell lines...
October 11, 2017: Chemosphere
https://www.readbyqxmd.com/read/29142431/characterization-of-leaf-extracts-of-schinus-terebinthifolius-raddi-by-gc-ms-and-chemometric-analysis
#6
Fabíola B Carneiro, Pablo Q Lopes, Ricardo C Ramalho, Marcus T Scotti, Sócrates G Santos, Luiz A L Soares
Background: Schinus terebinthifolius Raddi belongs to Anacardiacea family and is widely known as "aroeira." This species originates from South America, and its extracts are used in folk medicine due to its therapeutic properties, which include antimicrobial, anti-inflammatory, and antipyretic effects. The complexity and variability of the chemical constitution of the herbal raw material establishes the quality of the respective herbal medicine products. Objective: Thus, the purpose of this study was to investigate the variability of the volatile compounds from leaves of S...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142414/growth-arresting-activity-of-acmella-essential-oil-and-its-isolated-component-d-limonene-1-8-p-mentha-diene-against-trichophyton-rubrum-microbial-type-culture-collection-296
#7
Diptikanta Padhan, Smaranika Pattnaik, Ajaya Kumar Behera
Background: Spilanthes acmella is used as a remedy in toothache complaints by the tribal people of Western part of Odisha, India. Objective: The objective of this study was to study the growth-arresting activity of an indigenous Acmella essential oil (EO) (S. acmella Murr, Asteraceae) and its isolated component, d-limonene against Trichophyton rubrum (microbial type culture collection 296). Materials and Methods: The EO was extracted from flowers of indigenous S...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142389/bioactive-constituents-radical-scavenging-and-antibacterial-properties-of-the-leaves-and-stem-essential-oils-from-peperomia-pellucida-l-kunth
#8
Sunday O Okoh, Benson C Iweriebor, Omobola O Okoh, Anthony I Okoh
Background: Peperomia pellucida is an annual herbaceous ethnomedicinal plant used in the treatment of a variety of communicable and noncommunicable diseases in the Amazon region. Objective: The study aimed at profiling the bioactive constituents of the leaves and stem essential oils (LEO and SEO) of P. pellucida, their in vitro antibacterial and radical scavenging properties as probable lead constituents in the management of oxidative stress and infectious diseases...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29141549/a-high-throughput-quantitative-expression-analysis-of-cancer-related-genes-in-human-hepg2-cells-in-response-to-limonene-a-potential-anticancer-agent
#9
Rand R Hafidh, Saba Z Hussein, Mohammed Q MalAllah, Ahmed S Abdulamir, Fatimah Abu Bakar
BACKGROUND: Citrus bioactive compounds, as active anticancer agent, have been under focus by several studies worldwide. However, the underlying genes responsible for the anticancer potential have not been sufficiently highlighted. OBJECTIVES: The current study investigated the gene expression profile of hepatocellular carcinoma, HepG2, cells after treatment with Limonene. METHODS: The concentration that killed 50% of HepG2 cells was used to elucidate the genetic mechanisms of limonene anticancer activity...
November 14, 2017: Current Cancer Drug Targets
https://www.readbyqxmd.com/read/29125568/chemical-composition-of-herbal-macerates-and-corresponding-commercial-essential-oils-and-their-effect-on-bacteria-escherichia-coli
#10
Marietta Białoń, Teresa Krzyśko-Łupicka, Agnieszka Pik, Piotr P Wieczorek
This study addresses the chemical composition of some commercial essential oils (clove, juniper, oregano, and marjoram oils), as well as appropriate herbal extracts obtained in the process of cold maceration and their biological activity against selected Escherichia coli strains: E. coli ATTC 25922, E. coli ATTC 10536, and E. coli 127 isolated from poultry waste. On the basis of the gas chromatography-mass spectrometry (GCMS) analysis, it was found that the commercial essential oils revealed considerable differences in terms of the composition and diversity of terpenes, terpenoids and sesquiterpenes as compared with the extracts obtained from plant material...
November 10, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29123924/in-vitro-evaluation-of-essential-oils-derived-from-piper-nigrum-piperaceae-and-citrus-limonum-rutaceae-against-the-tick-rhipicephalus-boophilus-microplus-acari-ixodidae
#11
Rafaelle Vinturelle, Camila Mattos, Jéssica Meloni, Jeane Nogueira, Maria Júlia Nunes, Itabajara S Vaz, Leandro Rocha, Viviane Lione, Helena C Castro, Evelize Folly das Chagas
The present research aimed to study the chemical composition and acaricidal activity of Citrus limonum and Piper nigrum essential oils against the cattle tick Rhipicephalus microplus. GC-MS analysis of C. limonum essential oil showed limonene (50.3%), β-pinene (14.4%), and γ-terpinene (11.7%) as the major components; P. nigrum oil was mainly composed of β-caryophyllene (26.2%), σ-ocymene (5.8%), and α-pinene (5.5%). Acaricide activity was evaluated at concentrations of 2.5, 5.0, and 10.0% (v/v) of each plant oil, as well as 1 : 1 combination of both oils (5% : 5%, 2...
2017: Biochemistry Research International
https://www.readbyqxmd.com/read/29117373/seasonal-terpene-variation-in-needles-of-pinus-radiata-pinales-pinaceae-trees-attacked-by-tomicus-piniperda-coleoptera-scolytinae-and-the-effect-of-limonene-on-beetle-aggregation
#12
Pedro Romón, Domitila Aparicio, Francisco Palacios, Juan Carlos Iturrondobeitia, Thierry Hance, Arturo Goldarazena
Concentrations of four monoterpenes were determined in needles of Pinus radiata (D.Don) (Pinales: Pinaceae) trees that were attacked or nonattacked by Tomicus piniperda (L.) (Coleoptera: Scolytinae). Compounds were identified and quantified by gas chromatography-mass spectrometry. The mean ambient temperature was obtained using climate-recording data loggers. The effect of limonene on field aggregation was also evaluated at three limonene release rates using Lindgren attractant-baited traps and trap logs. Attacked trees produced less α-pinene in March, July, and November than nonattacked trees, less β-pinene in July and November, and less limonene from May to November...
September 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/29117148/physical-structural-barrier-and-antifungal-characterization-of-chitosan-zein-edible-films-with-added-essential-oils
#13
Monserrat Escamilla-García, Georgina Calderón-Domínguez, Jorge J Chanona-Pérez, Angélica G Mendoza-Madrigal, Prospero Di Pierro, Blanca E García-Almendárez, Aldo Amaro-Reyes, Carlos Regalado-González
Edible films (EFs) have gained great interest due to their ability to keep foods safe, maintaining their physical and organoleptic properties for a longer time. The aim of this work was to develop EFs based on a chitosan-zein mixture with three different essential oils (EOs) added: anise, orange, and cinnamon, and to characterize them to establish the relationship between their structural and physical properties. The addition of an EO into an EF significantly affected (p < 0.05) the a* (redness/greenness) and b* (yellowness/blueness) values of the film surface...
November 8, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29109957/-gold-pressed-essential-oil-an-essay-on-the-volatile-fragment-from-citrus-juice-industry-by-products-chemistry-and-bioactivity
#14
V N Kapsaski-Kanelli, E Evergetis, A Michaelakis, D P Papachristos, E D Myrtsi, S D Koulocheri, S A Haroutounian
Present essay explores the potentials of Citrus juice industry's by-products as alternative bioactive natural products resources. Four crude Cold Pressed Essential Oils (CPEOs), derived from orange, lemon, grapefruit, and mandarin, were studied. All CPEOs were subjected to water distillation, in order to obtain the volatile fragment, which was further fractionated with respect to distillation period in two parts, concluding to eight samples. These samples along with the four original CPEOs were assessed in relation to their phytochemical content and their repellent and larvicidal properties against Asian Tiger Mosquito...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29099075/abies-concolor-seeds-and-cones-as-new-source-of-essential-oils-composition-and-biological-activity
#15
Anna Wajs-Bonikowska, Łukasz Szoka, Ewa Karna, Anna Wiktorowska-Owczarek, Monika Sienkiewicz
The chemical composition, including the enantiomeric excess of the main terpenes, of essential oils from seeds and cones of Abies concolor was studied by chromatographic (GC) and spectroscopic methods (mass spectrometry, nuclear magnetic resonance), leading to the determination of 98 compounds. Essential oils were mainly composed of monoterpene hydrocarbons. The dominant volatiles of seed essential oil were: limonene (47 g/100 g, almost pure levorotary form) and α-pinene (40 g/100 g), while α-pinene (58 g/100 g), sabinene (11 g/100 g), and β-pinene (4...
November 2, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29097837/two-types-of-deposits-hyaline-droplets-and-eosinophilic-bodies-associated-with-%C3%AE-2u-globulin-accumulation-in-the-rat-kidney
#16
Masao Hamamura, Takafumi Oshikata, Koshirou Katoku, Minoru Tsuchitani, Ryoji Yamaguchi
Alpha2u-globulin is an adult male rat-specific protein that accumulates spontaneously or inductively in the renal proximal tubular epithelium and forms microscopically observable deposits, which are generally referred to as "hyaline droplets," whereas a specific type of deposits is referred to as "eosinophilic bodies" by Japanese toxicologic pathologists. We compared hyaline droplets and eosinophilic bodies using special stains including immunostaining for α2u-globulin and lysosome-associated membrane protein in spontaneously occurring and d-limonene-induced cases...
October 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/29095499/natural-occurrence-of-aldol-condensation-products-in-valencia-orange-oil
#17
Ingo Abreu, Neil C Da Costa, Alfred van Es, Jung-A Kim, Uma Parasar, Mauricio L Poulsen
Cold pressed orange oils contain predominantly d-limonene (approximately 95%) and various other lower concentration monoterpenes, sesquiterpenes, sinensals plus 3 key aliphatic aldehydes: hexanal, octanal. and decanal. The aldol self-condensation products or "dimers" for each aldehyde have been postulated as being present at low concentrations in the oil. However, to date only the hexanal dimer has been previously reported. In this paper, cold pressed Valencia orange oil was fractionally distilled/folded and analyzed by GC and high resolution GC-MS to detect these compounds on 2 different capillary column phases...
November 2, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/29081459/aroma-leakage-from-orange-juice-packed-in-gable-top-paper-containers-for-chilled-distribution
#18
Risa Aoki, Aika Tokuda, Yasutaka Shigemura, Machiko Mineki, Yoshio Sato
We conducted a study to examine aroma leakage from orange juice packed in gable-top paper containers for chilled distribution. Limonene, an aromatic component of orange juice, was considered as an index compound of aroma leakage, and its seepage on the surface of the container and concentration in the orange juice were measured by GC-MS for 12 commercial samples. After 3 days of storage, limonene was detected on the surface of 8 orange juice containers, and the concentration of limonene in the orange juice was found to have decreased...
2017: Shokuhin Eiseigaku Zasshi. Journal of the Food Hygienic Society of Japan
https://www.readbyqxmd.com/read/29080506/encapsulation-of-carotenoids-extracted-from-halophilic-archaea-in-oil-in-water-o-w-micro-and-nano-emulsions
#19
Marwa Chaari, Ioanna Theochari, Vassiliki Papadimitriou, Aristotelis Xenakis, Emna Ammar
Carotenoids extracted from halophilc Archaea have potential health benefits. Their poor water-solubility and low bioavailability is a challenge to their incorporation into foods. The aim of this work was the carotenoids encapsulation into two oil-in-water (O/W) dispersions, to increase their use as functional food applications. A nanoemulsion produced by high pressure homogenization and a spontaneously formed microemulsion were conceived. The limonene was the dispersed oil phase, and mixtures of Triton X-100/Tween-80 (3:1) as emulsifiers and of water/glycerol (2:1) as the continuous aqueous phase...
October 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29077029/herbicidal-activities-of-some-allelochemicals-and-their-synergistic-behaviors-toward-amaranthus-tricolor-l
#20
Nawasit Chotsaeng, Chamroon Laosinwattana, Patchanee Charoenying
Seven allelochemicals, namely R-(+)-limonene (A), vanillin (B), xanthoxyline (C), vanillic acid (D), linoleic acid (E), methyl linoleate (F), and (±)-odorine (G), were investigated for their herbicidal activities on Chinese amaranth (Amaranthus tricolor L.). At 400 μM, xanthoxyline (C) showed the greatest inhibitory activity on seed germination and seedling growth of the tested plant. Both vanillic acid (D) and (±)-odorine (G) inhibited shoot growth, however, apart from xanthoxyline (C), only vanillic acid (D) could inhibit root growth...
October 27, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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