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https://www.readbyqxmd.com/read/28549212/synthesis-of-four-monoterpene-derived-organosulfates-and-their-quantification-in-atmospheric-aerosol-samples
#1
Yuchen Wang, Jingyun Ren, X H Hilda Huang, Rongbiao Tong, Jian Zhen Yu
Monoterpenes, a major class of biogenic volatile organic compounds, are known to produce oxidation products that further react with sulfate to form organosulfates. The accurate quantification of monoterpene-derived organosulfates (OSs) is necessary for quantifying this controllable aerosol source; however, it has been hampered by a lack of authentic standards. Here we report a unified synthesis strategy starting from the respective monoterpene through Upjohn dihydroxylation or Sharpless asymmetric dihydroxylation followed by mono-sulfation with sulfur trioxide-pyridine complex...
May 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28547803/effects-of-maltose-and-lysine-treatment-on-coffee-aroma-by-flash-gas-chromatography-electronic-nose-and-gas-chromatography-mass-spectrometry
#2
He Yuqin, Zhang Haide, Wen Nana, Hu Rongsuo, Wu Guiping, Zeng Ying, Li Xiong, Miao Xiaodan
BACKGROUND: Arabica coffee is a subtropical agricultural product in China. Coffee undergoes a series of thermal reactions to form abundant volatile profiles after roasting, so it loses a lot of reducing sugars and amino acids. Adding carbonyl compounds with amino acids before roasting could ensure the nutrition and flavor of coffee. The technology is versatile for the development of coffee roasting process. This investigation evaluates the effects of combining maltose and lysine (Lys) to modify coffee aroma and the possibly related mechanisms...
May 26, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28544762/the-effect-of-a-tooth-tongue-gel-and-mouthwash-regimen-on-morning-oral-malodour-a-3-week-single-blind-randomized-clinical-trial
#3
E Van der Sluijs, G A Van der Weijden, N L Hennequin-Hoenderdos, D E Slot
AIM: To compare the effects of a regimen consisting of a tooth/tongue gel, tongue cleaner and mouthwash with the effects of using standard fluoride dentifrice on the organoleptic oral malodour score (ORG) and volatile sulphur compounds (VSCs). MATERIALS AND METHODS: A total, 66 non-dental students participated in a 3-week parallel, single-blind, randomized, controlled clinical trial. The test group used a tongue cleaner, a tooth/tongue gel and mouthwash containing amine fluoride/stannous fluoride and zinc lactate as oral malodour counteractive...
May 24, 2017: International Journal of Dental Hygiene
https://www.readbyqxmd.com/read/28542566/proteomic-analysis-in-the-dufour-s-gland-of-africanized-apis-mellifera-workers-hymenoptera-apidae
#4
Aparecida das Dores Teixeira, Patricia D Games, Benjamin B Katz, John M Tomich, José C Zanuncio, José Eduardo Serrão
The colony of eusocial bee Apis mellifera has a reproductive queen and sterile workers performing tasks such as brood care and foraging. Chemical communication plays a crucial role in the maintenance of sociability in bees with many compounds released by the exocrine glands. The Dufour's gland is a non-paired gland associated with the sting apparatus with important functions in the communication between members of the colony, releasing volatile chemicals that influence workers roles and tasks. However, the protein content in this gland is not well studied...
2017: PloS One
https://www.readbyqxmd.com/read/28541809/sequential-adaptation-of-nannochloropsis-gaditana-to-table-olive-processing-water
#5
Antonio Serrano, Carmen Contreras, Gonzalo Ruiz-Filippi, Rafael Borja, Fernando G Fermoso
The main objective of this study was to evaluate the suitability of Nannochloropsis gaditana to grow by sequential adaptation to TOPW (Table olive processing water) at increased substrate concentrations (10-80%). Sequential adaptation allows growing Nannochloropsis gaditana up to 80% TOPW, although the maximum microalgae biomass productions were achieved for percentages of 20-40%, i.e. 0.308 ± 0.005 g VSS (Volatile Suspended Solids)/L. In all growth experiments, proteins were the majority compound in the grown microalgae biomass (0...
May 25, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28540437/volatile-organic-compounds-and-good-laboratory-practices-in-the-in-vitro-fertilization-laboratory-the-important-parameters-for-successful-outcome-in-extended-culture
#6
Nupur Agarwal, Ratna Chattopadhyay, Sanghamitra Ghosh, Arpita Bhoumik, S K Goswami, Baidyanath Chakravarty
PURPOSE: This study aims to describe the role of implementing good laboratory practices to improve in vitro fertilization (IVF) outcomes which are of great interest for practitioners dealing with infertility. METHODS: Certain modifications were introduced in May 2015 in our IVF laboratory like high-efficiency particulate air CODA system, steel furniture instead of wooden, use of new disinfectants like oosafe, and restriction of personnel entry along with avoidance of cosmetics like perfume to improve pregnancy rates...
May 24, 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/28538653/development-of-diamond-and-silicon-mems-sensor-arrays-with-integrated-readout-for-vapor-detection
#7
Maira Possas-Abreu, Farbod Ghassemi, Lionel Rousseau, Emmanuel Scorsone, Emilie Descours, Gaelle Lissorgues
This paper reports on the development of an autonomous instrument based on an array of eight resonant microcantilevers for vapor detection. The fabricated sensors are label-free devices, allowing chemical and biological functionalization. In this work, sensors based on an array of silicon and synthetic diamond microcantilevers are sensitized with polymeric films for the detection of analytes. The main advantage of the proposed system is that sensors can be easily changed for another application or for cleaning since the developed gas cell presents removable electrical connections...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538204/non-volatile-extractable-analysis-of-prefilled-syringes-for-parenteral-administration-of-drug-products
#8
Noemí Dorival-García, Iben Larsson, Jonathan Bones
The determination of extractable profiles for single-use technologies represents an important aspect of pharmaceutical production to minimize any possible compromise in drug product quality or potential risk to patients by identifying substances that may potentially leach from such devices. An approach for the extractable assessment of prefilled syringes, a promising alternative for parenteral administration of pharmaceutical products, is described herein. Four extraction solvents were selected: a mixture 2-propanol:water (1:1), was intended to represent aggressive conditions to extract a broad spectrum of extractables, including organic additives and substances which are poorly water-soluble...
May 5, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28537706/sodium-rivals-silver-as-single-atom-active-centers-for-catalyzing-abatement-of-formaldehyde
#9
Yaxin Chen, Jiayi Gao, Zhiwei Huang, Meijuan Zhou, Junxiao Chen, Chao Li, Zhen Ma, Jianmin Chen, Xingfu Tang
The development of efficient alkali-based catalysts for the abatement of formaldehyde (HCHO), a ubiquitous air pollutant, is economically desirable. Here we comparatively study the catalytic performance of two single-atom catalysts, Na1/HMO and Ag1/HMO (HMO = Hollandite manganese oxide), in the complete oxidation of HCHO at low temperatures, in which the products are only CO2 and H2O. These catalysts are synthesized by anchoring single sodium ions or silver atoms on HMO(001) surfaces. Synchrotron X-ray diffraction patterns with structural refinement together with transmission electron microscopy images demonstrate that single sodium ions on the HMO(001) surfaces of Na1/HMO have the same local structures as silver atoms of Ag1/HMO...
May 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28536145/monoterpenes-support-systemic-acquired-resistance-within-and-between-plants
#10
Marlies Riedlmeier, Andrea Ghirardo, Marion Wenig, Claudia Knappe, Kerstin Koch, Elisabeth Georgii, Sanjukta Dey, Jane E Parker, Joerg-Peter Schnitzler, Corina Vlot
This study investigates the role of volatile organic compounds in systemic acquired resistance (SAR), a salicylic acid (SA)-associated, broad-spectrum immune response in systemic, healthy tissues of locally infected plants. Gas chromatography coupled to mass spectrometry analyses of SAR-related emissions of wild-type and non-SAR-signal-producing mutant plants associated SAR with monoterpene emissions. Headspace exposure of Arabidopsis thaliana to a mixture of the bicyclic monoterpenes α-pinene and β-pinene induced defense, accumulation of reactive oxygen species, and expression of SA- and SAR-related genes, including the SAR regulatory AZELAIC ACID INDUCED1 (AZI1) gene and three of its paralogs...
May 23, 2017: Plant Cell
https://www.readbyqxmd.com/read/28535935/qualitative-analyses-of-less-volatile-organic-molecules-from-female-skin-scents-by-comprehensive-two-dimensional-gas-chromatography-time-of-flight-mass-spectrometry
#11
Petr Doležal, Pavlína Kyjaková, Irena Valterová, Štěpán Urban
Instrumental human scent analysis is undoubtedly desirable for many forensic as well medical applications. Most of the previous human scent studies were focused on volatile organic compounds (VOCs) which were analysed by head space solid phase micro-extraction gas chromatography/mass spectrometry (HS-SPME-GC/MS). This method is, however, significantly less sensitive to "heavier" less volatile compounds emitted from the human skin. These less volatile organic scent molecules probably create the basis of the individual human scent signature, and therefore, our attention is focused mainly on these "heavier" compounds...
May 1, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28535600/new-approach-to-resolve-the-humidity-problem-in-voc-determination-in-outdoor-air-samples-using-solid-adsorbent-tubes-followed-by-td-gc-ms
#12
Alba Maceira, Laura Vallecillos, Francesc Borrull, Rosa Maria Marcé
This study describes the humidity effect in the sampling process by adsorbent tubes followed by thermal desorption and gas chromatography-mass spectrometry (TD-GC-MS) for the determination of volatile organic compounds (VOCs) in air samples and evaluates possible solutions to this problem. Two multi-sorbent bed tubes, Tenax TA/Carbograph 1TD and Carbotrap B/Carbopack X/Carboxen 569, were tested in order to evaluate their behaviour in the presence of environmental humidity. Humidity problems were demonstrated with carbon-based tubes, while Tenax-based tubes did not display any influence...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28535590/emission-of-volatile-organic-compounds-and-production-of-secondary-organic-aerosol-from-stir-frying-spices
#13
Tengyu Liu, Qianyun Liu, Zijun Li, Lei Huo, ManNin Chan, Xue Li, Zhen Zhou, Chak K Chan
Cooking is an important source of volatile organic compounds (VOCs) and a potential source of secondary organic aerosol (SOA) both indoors and outdoors. In this study, VOC emissions from heating corn oil and stir-frying spices (i.e. garlic, ginger, myrcia and zanthoxylum piperitum (Sichuan pepper)) were characterized using an on-line membrane inlet vacuum ultraviolet single-photon ionization time-of-flight mass spectrometer (VUV-SPI-TOFMS). VOC emissions from heating corn oil were dominated by aldehydes, which were enhanced by factors of one order of magnitude when stir-frying spices...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28535479/adsorption-of-vocs-onto-engineered-carbon-materials-a-review
#14
REVIEW
Xueyang Zhang, Bin Gao, Anne Elise Creamer, Chengcheng Cao, Yuncong Li
Volatile organic compounds (VOCs) severely threaten human health and the ecological environment because most of them are toxic, mutagenic, and carcinogenic. The persistent increase of VOCs together with the stringent regulations make the reduction of VOC emissions more imperative. Up to now, numerous VOC treatment technologies have emerged, such as incineration, condensation, biological degradation, absorption, adsorption, and catalysis oxidation et al. Among them, the adsorption technology has been recognized as an efficient and economical control strategy because it has the potential to recover and reuse both adsorbent and adsorbate...
May 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28535247/physical-and-physiological-factors-influence-behavioral-responses-of-cochliomyia-macellaria-diptera-calliphoridae-to-synthetic-attractants
#15
M F Chaudhury, J J Zhu, S R Skoda
Volatile chemicals from waste artificial larval media as well as from bovine blood inoculated with bacteria isolated from screwworm-infested wounds attract gravid females of Cochliomyia hominivorax Coquerel and Cochliomyia macellaria (F.). Chemicals identified from volatiles are dimethyl disulfide, dimethyl trisulfide, phenol, p-cresol, and indole; a blend of these attracted females to oviposit. Present studies investigated the effectiveness of these compounds, either in a blend or individually as potential oviposition attractants...
May 23, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28534494/airborne-observations-reveal-elevational-gradient-in-tropical-forest-isoprene-emissions
#16
Dasa Gu, Alex B Guenther, John E Shilling, Haofei Yu, Maoyi Huang, Chun Zhao, Qing Yang, Scot T Martin, Paulo Artaxo, Saewung Kim, Roger Seco, Trissevgeni Stavrakou, Karla M Longo, Julio Tóta, Rodrigo Augusto Ferreira de Souza, Oscar Vega, Ying Liu, Manish Shrivastava, Eliane G Alves, Fernando C Santos, Guoyong Leng, Zhiyuan Hu
Isoprene dominates global non-methane volatile organic compound emissions, and impacts tropospheric chemistry by influencing oxidants and aerosols. Isoprene emission rates vary over several orders of magnitude for different plants, and characterizing this immense biological chemodiversity is a challenge for estimating isoprene emission from tropical forests. Here we present the isoprene emission estimates from aircraft eddy covariance measurements over the Amazonian forest. We report isoprene emission rates that are three times higher than satellite top-down estimates and 35% higher than model predictions...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28534028/mechanisms-affecting-the-gut-of-preterm-infants-in-enteral-feeding-trials
#17
Nicholas D Embleton, Janet E Berrington, Jon Dorling, Andrew K Ewer, Edmund Juszczak, John A Kirby, Christopher A Lamb, Clare V Lanyon, William McGuire, Christopher S Probert, Stephen P Rushton, Mark D Shirley, Christopher J Stewart, Stephen P Cummings
Large randomized controlled trials (RCTs) in preterm infants offer unique opportunities for mechanistic evaluation of the risk factors leading to serious diseases, as well as the actions of interventions designed to prevent them. Necrotizing enterocolitis (NEC) a serious inflammatory gut condition and late-onset sepsis (LOS) are common feeding and nutrition-related problems that may cause death or serious long-term morbidity and are key outcomes in two current UK National Institutes for Health Research (NIHR) trials...
2017: Frontiers in Nutrition
https://www.readbyqxmd.com/read/28533031/enantioseparation-and-optical-rotation-of-flavor-relevant-4-alkyl-branched-fatty-acids
#18
Dorothee Eibler, Walter Vetter
Short chain 4-alkyl-branched fatty acids are character impact compounds of the flavor of sheep and goat milk and meat. Due to their methyl or ethyl branches these volatile fatty acids are chiral, and both enantiomers are characterized by different aroma intensities. Recently, it was found that 4-methyloctanoic acid (4-Me-8:0), 4-ethyloctanoic acid (4-Et-8:0), and 4-methylnonanoic acid (4-Me-9:0) are enantiopure in goat and sheep samples, if present. Here we generated enantiopure or enantioenriched standards from racemates by means of (R)-selective esterification with lipase B and verified that 4-Me-8:0, 4-Et-8:0 and 4-Me-9:0 were (R)-enantiopure in these tissues...
May 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28530563/effect-of-gallic-and-protocatechuic-acids-on-the-metabolism-of-ethyl-carbamate-in-chinese-yellow-rice-wine-brewing
#19
Wanyi Zhou, Ruosi Fang, Qihe Chen
It was studied that gallic and protocatechuic acids played important roles in ethyl carbamate (EC) forming. Gallic and protocatechuic acids can reduce the arginine consumption through inhibiting the arginine deiminase enzyme. Therefore, they are generally added to regulate EC catabolism in the course of yellow rice wine leavening at the third day. In this work, gallic and protocatechuic acids made little influence on the growth of Saccharomyces cerevisiae. Besides, the addition of 200mg/L gallic or protocatechuic acid could prevent the transformation from urea/citrulline to EC...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28528107/foliar-nitrogen-application-in-cabernet-sauvignon-vines-effects-on-wine-flavonoid-and-amino-acid-content
#20
Gastón Gutiérrez-Gamboa, Teresa Garde-Cerdán, Javier Portu, Yerko Moreno-Simunovic, Ana M Martínez-Gil
Wine quality greatly depends on its chemical composition. Among the most important wine chemical compounds, flavonoids are the major contributors to wine organoleptic properties while amino acids have a huge impact on fermentation development and wine volatile profile. Likewise, nitrogen applications are known to have an impact on wine composition. Therefore, the aim of this work was to study the effects of foliar nitrogen applications on wine flavonoid and amino acid composition. The experiment involved five foliar nitrogen applications at veraison time: urea (Ur), urea plus sulphur (Ur+S), arginine (Arg), and two commercial fertilizers Nutrimyr Thiols (NT) and Basfoliar Algae (BA)...
June 2017: Food Research International
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