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https://www.readbyqxmd.com/read/28532258/fumigant-and-repellent-activities-of-essential-oil-extracted-from-artemisia-dubia-and-its-main-compounds-against-two-stored-product-pests
#1
Jun-Yu Liang, Shan-Shan Guo, Wen-Juan Zhang, Zhu-Feng Geng, Zhi-Wei Deng, Shu-Shan Du, Ji Zhang
The major chemical constituents of the essential oil extracted from Artemisia dubia wall. ex Bess. (Family: Asteraceae) were found as terpinolene (19.02%), limonene (17.40%), 2,5-etheno[4.2.2]propella-3,7,9-triene (11.29%), isoelemicin (11.05%) and p-cymene-8-ol (5.93%). Terpinolene and limonene were separated as main components from the essential oil. The essential oil showed fumigant toxicity against Tribolium castaneum and Liposcelis bostrychophila with LC50 values of 49.54 and 0.74 mg/L, respectively. The essential oil and isolated compounds of A...
May 22, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28526637/identification-and-biological-activity-of-the-volatile-compounds-of-glycyrrhiza-triphylla-fisch-c-a-mey
#2
Abolfazl Shakeri, Javad Akhtari, Vahid Soheili, Seyedeh Faezeh Taghizadeh, Amirhossein Sahebkar, Rezvan Shaddel, Javad Asili
Chemical composition and biological (antimicrobial, antioxidant and cytotoxic) activities of essential oils (EO) obtained from the aerial parts of Glycyrrhiza triphylla Fisch. & C.A.Mey (G. triphylla) were evaluated in the present study. The EO was isolated and analyzed using gas chromatography-mass spectrometry (GC-MS). Fifty-five compounds representing 99.3% of the total oil composition were identified. Major components of the oil were β-caryophyllene (25.4%), limonene (16.7%), β-myrcene (16.0%) and α-humulene (4...
May 16, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28524256/quantification-of-l-carvone-in-toothpastes-available-on-the-swedish-market
#3
Liv Kroona, Gunnar Warfvinge, Marléne Isaksson, Camilla Ahlgren, Jakob Dahlin, Östen Sörensen, Magnus Bruze
BACKGROUND: Toothpastes have widespread use in the population, and contain flavours used to give a pleasant and often minty aroma. Flavours are prevalent allergens in toothpastes, and adverse reactions often present as perioral dermatitis or stomatitis. l-Carvone, a mint flavour found in spearmint oil, is one of these allergens. There are few studies on contact allergy to l-carvone, and some of them have indicated a positive relationship with oral lichenoid lesions. OBJECTIVES: To qualitatively and quantitatively investigate the presence of l-carvone in commercially available toothpastes on the Swedish market...
May 19, 2017: Contact Dermatitis
https://www.readbyqxmd.com/read/28520791/toxic-and-hormetic-like-effects-of-three-components-of-citrus-essential-oils-on-adult-mediterranean-fruit-flies-ceratitis-capitata
#4
Stella A Papanastasiou, Eleftheria-Maria D Bali, Charalampos S Ioannou, Dimitrios P Papachristos, Kostas D Zarpas, Nikos T Papadopoulos
Plant essential oils (EOs) and a wide range of their individual components are involved in a variety of biological interactions with insect pests including stimulatory, deterrent, toxic and even hormetic effects. Both the beneficial and toxic properties of citrus EOs on the Mediterranean fruit fly (medfly) have been experimentally evidenced over the last years. However, no information is available regarding the toxic or beneficial effects of the major components of citrus EOs via contact with the adults of the Mediterranean fruit fly...
2017: PloS One
https://www.readbyqxmd.com/read/28511284/non-mix-fragrances-are-top-sensitizers-in-consecutive-dermatitis-patients%C3%A2-%C3%A2-a-cross-sectional-study-of-the-26-eu-labelled-fragrance-allergens
#5
Niels H Bennike, Claus Zachariae, Jeanne D Johansen
BACKGROUND: For cosmetics, it is mandatory to label 26 fragrance substances, including all constituents of fragrance mix I (FM I) and fragrance mix II (FM II). Earlier reports have not included oxidized R-limonene [hydroperoxides of R-limonene (Lim-OOH)] and oxidized linalool [hydroperoxides of linalool (Lin-OOH)], and breakdown testing of FM I and FM II has mainly been performed in selected, mix-positive patients. OBJECTIVES: To report the prevalence of sensitization to the 26 fragrances, and to assess concomitant reactivity to FM I and/or FM II...
May 16, 2017: Contact Dermatitis
https://www.readbyqxmd.com/read/28498837/whitefly-attraction-to-rosemary-rosmarinus-officinialis-l-is-associated-with-volatile-composition-and-quantity
#6
Dganit Sadeh, Nadav Nitzan, Alona Shachter, David Chaimovitsh, Nativ Dudai, Murad Ghanim
Whitefly (Bemisia tabaci) is an important insect pest, causing severe damage to agricultural crops. The pest was recorded in a commercial rosemary (Rosmarinus officinalis, Lamiaceae) field, colonizing rosemary variety (var.) '2', but not '11'. A series of field and controlled laboratory choice bioassays confirmed the observed phenomenon. Mature potted plants of the two varieties were randomly organized in a lemon verbena (Lippia citrodora) and lemon grass (Cymbopogon spp.) fields. Seven days later var. '2' was significantly more colonized by whiteflies than var...
2017: PloS One
https://www.readbyqxmd.com/read/28494107/recommendation-to-test-limonene-hydroperoxides-0-3-and-linalool-hydroperoxides-1-0-in-the-british-baseline-patch-test-series
#7
C Wlodek, C M Penfold, J F Bourke, M M U Chowdhury, S M Cooper, S Ghaffar, C Green, C R Holden, G A Johnston, A A Mughal, C Reckling, R A Sabroe, N M Stone, D Thompson, S M Wilkinson, D A Buckley
BACKGROUND: There is a significant rate of sensitisation worldwide to the oxidised fragrance terpenes limonene and linalool. Patch testing to oxidised terpenes is not routinely carried out; the ideal patch test concentration is unknown. OBJECTIVES: To determine the best test concentrations for limonene and linalool hydroperoxides, added to the British baseline patch test series, to optimise detection of true allergy and minimise irritant reactions. METHODS: During 2013-2014, 4563 consecutive patients in 12 UK centres were tested to hydroperoxides of limonene in petrolatum (pet...
May 11, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28493625/significant-oh-production-under-surface-cleaning-and-air-cleaning-conditions-impact-on-indoor-air-quality
#8
Nicola Carslaw, Louise Fletcher, Dwayne Heard, Trevor Ingham, Hannah Walker
We report measurements of hydroxyl (OH) and hydroperoxy (HO2 ) radicals made by laser-induced fluorescence spectroscopy in a computer classroom (i) in the absence of indoor activities (ii) during desk cleaning with a limonene-containing cleaner (iii) during operation of a commercially available 'air cleaning' device. In the unmanipulated environment, the one-minute averaged OH concentration remained close to or below the limit of detection (6.5 x 10(5) molecule cm(-3) ), whilst that of HO2 was 1.3 x 10(7) molecule cm(-3) ...
May 11, 2017: Indoor Air
https://www.readbyqxmd.com/read/28490148/characterisation-of-aroma-active-and-off-odour-compounds-in-german-rainbow-trout-oncorhynchus-mykiss-part-ii-case-of-fish-meat-and-skin-from-earthen-ponds-farming
#9
Mohamed Ahmed Abbas Mahmoud, Andrea Buettner
Odorous molecules in earthen-ponds rainbow trout aquaculture farming in Germany were investigated with a special focus on musty-earthy off-odorants. To this aim, fish meat and skin were extracted using solvent-assisted flavour evaporation (SAFE) and were mildly concentrated; extracts were subsequently analysed by means of one- and two-dimensional high-resolution gas chromatography coupled with mass spectrometry and olfactometry (GC-MS/O and 2D-HRGC-MS/O). Aroma extract dilution analysis (AEDA) of the solvent extracts revealed the presence of 76 odorants of which 75 were successfully identified...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28490124/explaining-the-antioxidant-activity-of-some-common-non-phenolic-components-of-essential-oils
#10
Andrea Baschieri, Majlinda Daci Ajvazi, Judith Laure Folifack Tonfack, Luca Valgimigli, Riccardo Amorati
Limonene, linalool and citral are common non-phenolic terpenoid components of essential oils, with attributed controversial antioxidant properties. The kinetics of their antioxidant activity was investigated using the inhibited autoxidation of a standard model substrate. Results indicate that antioxidant behavior of limonene, linalool and citral occurs by co-oxidation with the substrate, due to very fast self-termination and cross-termination of the oxidative chain. Rate constants kp and 2kt, (M(-1)s(-1)) at 30°C were 4...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28488391/essential-oil-variability-in-natural-populations-of-artemisia-campestris-l-and-artemisia-herba-alba-asso-and-incidence-on-antiacetylcholinesterase-and-antioxidant-activities
#11
Faten Younsi, Sameh Mehdi, Oumayma Aissi, Najoua Rahali, Rym Jaouadi, Mohamed Boussaid, Chokri Messaoud
The intraspecific variability of A. herba-alba and A. campestris essential oils and the evaluation of their antioxidant and antiacetylcholinesterase activities were determined. A. herba-alba essential oil was found rich in camphor (19.61%), α-thujone (19.40%), β-thujone (9.44%), chrysanthenone (9.26%) and trans-sabinyl acetate (8.43%). The major compounds of A. campestris essential oil were germacrene D (16.38%), β-pinene (16.33%) and limonene (9.17%). Significant variation in the essential oil composition was observed among populations of each species...
May 10, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28480390/geographical-impact-on-essential-oil-composition-of-endemic-kundmannia-anatolica-hub-mor-apiaceae
#12
Arif Şanli, Tahsin Karadoğan
BACKGROUND: Kundmannia anatolica Hub.-Mor. is an endemic specie of Apiaceae diversified in Turkey. Several parts of the plant may contain essential oils in different quantity which can be influenced by environmental factors, mainly altitude. The aim of this study was to test whether there is any altitude effect on volatile chemical constituents of essential oil obtained from the fruits of K. anatolica growing spontaneously in different altitudes of Lakes Region in Turkey. MATERIALS AND METHODS: K...
2017: African Journal of Traditional, Complementary, and Alternative Medicines: AJTCAM
https://www.readbyqxmd.com/read/28475824/favored-conformations-of-carbonyl-compounds-a-structural-study-of-n-octanal
#13
Khai-Nghi Truong, Lindsey Blasidell Weger, Wolfgang Stahl, Halima Mouhib
We report on the molecular structures of the two most abundant conformers of n-octanal observed by molecular beam Fourier transform microwave spectroscopy. Next to limonene, which is the main component of citrus-oil, octanal and other n-alkyl aldehydes strongly enhance the typical fresh smell of lemon-oil. Due to the high flexibility of its n-alkyl chain and the high number of possible conformers, different semi-empirical methods (AM1, PM3, MMFF94) were used to sample the conformational space of octanal before performing more sophisticated quantum chemical calculations at the MP2 level of theory...
May 5, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28474217/compositional-shift-in-fatty-acid-profiles-of-lipids-obtained-from-oleaginous-yeasts-upon-the-addition-of-essential-oil-from-citrus-sinensis-l
#14
Bijaya K Uprety, Sudip K Rakshit
Tailoring lipids from oleaginous yeasts to contain specific types of fatty acid is of considerable interest to food, fuel, and pharmaceutical industries. In this study, the essential oil obtained from Citrus sinesus L. has been used to alter the fatty acid composition of two common oleaginous yeasts, Rhodosporidium toruloides and Cryptococcus curvatus. With increasing levels of essential oil in the medium, the metabolic flux of the fatty acid biosynthesis pathway shifted towards saturated fatty acid production...
May 5, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28472470/effect-of-metarhizium-anisopliae-ascomycete-cypermethrin-and-d-limonene-alone-and-combined-on-larval-mortality-of-rhipicephalus-sanguineus-acari-ixodidae
#15
Omar Francisco Prado-Rebolledo, Jaime Molina-Ochoa, Roberto Lezama-Gutiérrez, Luis Jorge García-Márquez, Yureida B Minchaca-Llerenas, Eduardo Morales-Barrera, Guillermo Tellez, Billy Hargis, Steven R Skoda, John E Foster
The effect of the fungus Metarhizium anisopliae Ma14 strain, D-limonene, and cypermethrin, alone and combined, on the mortality of Rhipicephalus sanguineus Latreille larvae was evaluated. Eight separate groups with 25 tick larvae were inoculated with the fungus, cypermethrin, and D-limonene, and four groups were used as untreated controls. The groups were inoculated with serial dilutions of each treatment material: for example, conidial concentrations were 1 × 101, 1 × 102, 1 × 103, 1 × 104, 1 × 105, 1 × 106, 1 × 107, and 1 × 108...
May 4, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28464964/bactrocera-oleae-induced-olive-vocs-routing-mate-searching-in-psyttalia-concolor-males-impact-of-associative-learning
#16
G Giunti, G Benelli, V Palmeri, A Canale
Olfaction is a key sense routing foraging behaviour in parasitoids. Preferences for food, mate and host stimuli can be innate in parasitic wasps. Alternatively, learning-mediated mechanisms play a crucial role. Females of the braconid parasitoid Psyttalia concolor exploit olfactory cues arising from tephritid hosts and related microhabitats. However, little is known on the olfactory stimuli routing males searching for mates. In this study, we focused on the attractiveness of Bactrocera oleae-induced olive volatiles towards P...
May 3, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28460918/influence-of-surfactant-type-and-thermal-cycling-on-formation-and-stability-of-flavor-oil-emulsions-fabricated-by-spontaneous-emulsification
#17
Amir Hossein Saberi, Yuan Fang, David Julian McClements
Food-grade emulsions can be fabricated using simple and inexpensive low-energy homogenization methods. In this study, we examined the influence of surfactant type (Tween 40, 60, and 80), oil phase composition (limonene-to-medium chain triglyceride ratio), and temperature (25 to 95°C) on the formation and stability of flavor oil-in-water emulsions (10wt% oil, 15wt% surfactant, pH3) fabricated using spontaneous emulsification. Transparent emulsion-based delivery systems containing ultrafine droplets (d<40nm) could be formed at room temperature at certain limonene contents for all three surfactants...
November 2016: Food Research International
https://www.readbyqxmd.com/read/28456415/degradation-of-indoor-limonene-by-outdoor-ozone-a-cascade-of-secondary-organic-aerosols
#18
Carolin Rösch, Dirk K Wissenbach, Ulrich Franck, Manfred Wendisch, Uwe Schlink
In indoor air, terpene-ozone reactions can form secondary organic aerosols (SOA) in a transient process. 'Real world' measurements conducted in a furnished room without air conditioning were modelled involving the indoor background of airborne particulate matter, outdoor ozone infiltrated by natural ventilation, repeated transient limonene evaporations, and different subsequent ventilation regimes. For the given setup, we disentangled the development of nucleated, coagulated, and condensed SOA fractions in the indoor air and calculated the time dependence of the aerosol mass fraction (AMF) by means of a process model...
April 26, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28455208/soap-production-a-green-prospective
#19
Sandra Félix, Joana Araújo, Ana Maria Pires, Ana Cláudia Sousa
A green prospective based on the reuse of waste materials such as almond shells, orange peel and used cooking oil to manufacture soap is presented. In Portugal, thousands of tons of waste are generated from used cooking oil and production of nut shells' residues is growing every year. In addition, the high consumption of citrus fruits, oranges in particular, generates large amounts of citrus peel. Therefore, it is necessary to diversify reuse mechanisms of these wastes, in order to make them back into raw materials...
April 25, 2017: Waste Management
https://www.readbyqxmd.com/read/28444796/determination-of-volatile-flavour-profiles-of-citrus-spp-fruits-by-sde-gc-ms-and-enantiomeric-composition-of-chiral-compounds-by-mdgc-ms
#20
Joon Ho Hong, Naeem Khan, Nargis Jamila, Young Shin Hong, Eun Yeong Nho, Ji Yeon Choi, Cheong Mi Lee, Kyong Su Kim
INTRODUCTION: Citrus fruits are known to have characteristic enantiomeric key compounds biosynthesised by highly stereoselective enzymatic mechanisms. In the past, evaluation of the enantiomeric ratios of chiral compounds in fruits has been applied as an effective indicator of adulteration by the addition of synthetic compounds or natural components of different botanical origin. OBJECTIVE: To analyse the volatile flavour compounds of Citrus junos Sieb. ex Tanaka (yuzu), Citrus limon BURM...
April 25, 2017: Phytochemical Analysis: PCA
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