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Volatile organic compound analysis

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https://www.readbyqxmd.com/read/28317715/evaluation-of-penicillium-expansum-for-growth-patulin-accumulation-nonvolatile-compounds-and-volatile-profile-in-kiwi-juices-of-different-cultivars
#1
Yuan Wang, Tingting Shan, Yahong Yuan, Zhiwei Zhang, Chunfeng Guo, Tianli Yue
Patulin (PAT) contamination and changes of nonvolatile and volatile compounds caused by Penicillium expansum in fresh juices of 8 kiwi cultivars were investigated. Growth and PAT production of P. expansum were greater at 25°C than at 4°C. P. expansum grew in kiwi juices under pH ranging from 2.75 to 3.27 and produced 45.10-268.88μg/mL of PAT at 25°C. Decreases occurred in malic acid and soluble protein; while consumption and production simultaneously happened for reducing sugar, total soluble solid, titratable acid, citric acid, ascorbic acid and total phenolics...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28291597/diel-rhythms-in-the-volatile-emission-of-apple-and-grape-foliage
#2
Valentino Giacomuzzi, Luca Cappellin, Iuliia Khomenko, Franco Biasioli, Alan L Knight, Sergio Angeli
This study investigated the diel emission of volatile organic compounds (VOCs) from intact apple (Malus x domestica Borkh., cv. Golden Delicious) and grape (Vitis vinifera L., cv. Pinot Noir) foliage. Volatiles were monitored continuously for 48 h by proton transfer reaction - time of flight - mass spectrometry (PTR-ToF-MS). In addition, volatiles were collected by closed-loop-stripping-analysis (CLSA) and characterized by gas chromatography-mass spectrometry (GC-MS) after 1 h and again 24 and 48 h later...
March 11, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28290313/high-hydrostatic-pressure-treatments-enhance-volatile-components-of-pre-germinated-brown-rice-revealed-by-aromatic-fingerprinting-based-on-hs-spme-gc-ms-and-chemometric-methods
#3
Qiang Xia, Jun Mei, Wenjuan Yu, Yunfei Li
Germination favors to significantly enhance functional components and health attributes of whole-grain brown rice (BR), but the production of germinated BR (GBR) compromises the typical rice flavor perception due to soaking process. Simultaneously, high hydrostatic pressure (HHP) is considered as an effective processing technique to enhance micronutrients utilization efficiency of GBR and improve products flavor, but no information about the effects of HHP treatments on volatile fingerprinting of GBR has been reported...
January 2017: Food Research International
https://www.readbyqxmd.com/read/28288212/direct-experimental-probing-and-theoretical-analysis-of-the-reaction-between-the-simplest-criegee-intermediate-ch2oo-and-isoprene
#4
Z C J Decker, K Au, L Vereecken, L Sheps
Recent advances in the spectroscopy of Criegee intermediates (CI) have enabled direct kinetic studies of these highly reactive chemical species. The impact of CI chemistry is currently being incorporated into atmospheric models, including their reactions with trace organic and inorganic compounds. Isoprene, C5H8, is a doubly-unsaturated hydrocarbon that accounts for the largest share of all biogenic emissions around the globe and is also a building block of larger volatile organic compounds. We report direct measurements of the reaction of the simplest CI (CH2OO) with isoprene, using time-resolved cavity-enhanced UV absorption spectroscopy...
March 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28287097/a-novel-microwave-induced-plasma-ionization-source-for-ion-mobility-spectrometry
#5
Jianxiong Dai, Zhongjun Zhao, Gaoling Liang, Yixiang Duan
This work demonstrates the application of a novel microwave induced plasma ionization (MIPI) source to ion mobility spectrometry (IMS). The MIPI source, called Surfatron, is composed of a copper cavity and a hollow quartz discharge tube. The ion mobility spectrum of synthetics air has a main peak with reduced mobility of 2.14 cm(2)V(-1)s(-1) for positive ion mode and 2.29 cm(2)V(-1)s(-1) for negative ion mode. The relative standard deviations (RSD) are 0.7% and 1.2% for positive and negative ion mode, respectively...
March 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28284437/detection-and-characterization-of-volatile-organic-compounds-from-burned-human-and-animal-remains-in-fire-debris
#6
John D DeHaan, Eimi I Taormina, David J Brien
Debris collected from various test sites where mammalian remains (human and porcine) had been burned in a variety of full-scale fire scenarios was evaluated for the presence of volatile residues that could be characteristic of those remains. Levels of volatiles were measured using the method commonly used for fire debris analysis: gas chromatography-mass spectrometry. Homologous n-aldehydes (from n-pentanal to n-nonanal) proved to be a significant indicator of the presence of burned animal tissue as they were observed in nearly all of the samples...
March 2017: Science & Justice: Journal of the Forensic Science Society
https://www.readbyqxmd.com/read/28281139/spatial-distributions-source-apportionment-and-ecological-risk-of-svocs-in-water-and-sediment-from-xijiang-river-pearl-river-delta
#7
Jiao Tang, Taicheng An, Guiying Li, Chaohai Wei
Xijiang River is an important drinking water source in Guangxi Province, China. Along the Xijiang River and surrounding tributary, the pollution profile of three important groups of semi-volatile organic compounds, including polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs) and phthalate esters (PAEs), was analyzed. Relatively low levels of PAHs (64-3.7 × 10(2) ng L(-1)) and OCPs (16-70 ng L(-1)), but high levels of PAEs (7.9 × 10(2)-6.8 × 10(3) ng L(-1)) occurred in the water...
March 9, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28278029/overview-of-surface-measurements-and-spatial-characterization-of-submicron-particulate-matter-during-the-discover-aq-2013-campaign-in-houston
#8
Y J Leong, N P Sanchez, H W Wallace, B Karakurt Cevik, C S Hernandez, Y Han, J H Flynn, P Massoli, C Floerchinger, E C Fortner, S Herndon, J K Bean, L Hildebrandt Ruiz, W Jeon, Y Choi, B Lefer, R J Griffin
The sources of submicron particulate matter (PM1) remain poorly characterized in the industrialized city of Houston. A mobile sampling approach was used to characterize PM1 composition and concentration across Houston based on high time resolution measurements of non-refractory PM1 and trace gases during the DISCOVER-AQ Texas 2013 campaign. Two pollution zones with marked differences in PM1 levels, character, and dynamics were established based on cluster analysis of organic aerosol mass loadings sampled at sixteen sites...
February 28, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28275227/halogenated-volatile-anesthetics-in-the-intensive-care-unit-current-knowledge-on-an-upcoming-practice
#9
Pascal L Langlois, Frederick D'Aragon, William Manzanares
The aim of this narrative review was to highlight key points of volatile anesthetics administration in the intensive care unit (ICU), including AnaConDa® and Mirus® devices characteristics and the reported findings on clinical outcomes in critically ill patients. Intravenous sedation in the ICU is associated with issues, such as over- and under-sedation. Halogenated compounds, which can be safely administered by inserting a device in any ICU ventilation circuit, have interesting pharmacodynamic and pharmacokinetic profiles for patients with multi-organ failure...
March 8, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28274458/a-study-on-accumulation-of-volatile-organic-compounds-during-ochratoxin-a-biosynthesis-and-characterization-of-the-correlation-in-aspergillus-carbonarius-isolated-from-grape-and-dried-vine-fruit
#10
Xiaoxu Zhang, Zhan Cheng, Liyan Ma, Jingming Li
Volatile organic compounds (VOCs) and ochratoxin A (OTA) were detected in Aspergillus carbonarius strains (AF, SD26 and SD27) during a 7-day growing period, using HS-SPME-GC-MS and HPLC-MS/MS, respectively. Results showed that 33 VOCs were detected in these strains. The AF strain showed the different sesquiterpene profile compared with the other strains. Principal component analysis revealed that the AF strain was segregated from the other two strains regarding the VOC profile, especially the sesquiterpene profile...
July 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28274410/global-volatile-profile-of-virgin-olive-oils-flavoured-by-aromatic-medicinal-plants
#11
R Perestrelo, C Silva, P Silva, J S Câmara
The global volatile profile of commercial virgin olive oils and flavoured olive oils with aromatic/medicinal plants, was established using liquid-liquid microextraction (LLME) and headspace solid-phase microextraction (HS-SPME) combined with gas chromatography-quadrupole mass spectrometry (GC-qMS). More than 60 volatile organic compounds (VOCs belonging to different groups were identified using both methods. Olive oils volatile profile was slightly influenced by maceration process, which occurred at room temperature (20±2°C) for 15days...
July 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28260695/non-invasive-breath-monitoring-with-enose-does-not-improve-glucose-diagnostics-in-critically-ill-patients-in-comparison-to-continuous-glucose-monitoring-in-blood
#12
Jan Hendrik Leopold, Lieuwe Bos, Camilla Colombo, Peter Sterk, Marcus Schultz, Ameen Abu-Hanna
INTRODUCTION: Continuous glucose monitoring (CGM) can be beneficiary in critically ill patients. Current CGM devices rely on subcutaneous or blood plasma glucose measurements and consequently there is an increased risk of infections and the possibility of loss of blood with each measurement. A potential method to continuously and non-invasively measure blood glucose levels is using exhaled breath. A correlation between blood glucose levels and volatile organic compounds (VOCs) in the exhaled breath was already reported...
March 6, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28256598/volatile-metabolomic-signature-of-human-breast-cancer-cell-lines
#13
Catarina L Silva, Rosa Perestrelo, Pedro Silva, Helena Tomás, José S Câmara
Breast cancer (BC) remains the most prevalent oncologic pathology in women, causing huge psychological, economic and social impacts on our society. Currently, the available diagnostic tools have limited sensitivity and specificity. Metabolome analysis has emerged as a powerful tool for obtaining information about the biological processes that occur in organisms, and is a useful platform for discovering new biomarkers or make disease diagnosis using different biofluids. Volatile organic compounds (VOCs) from the headspace of cultured BC cells and normal human mammary epithelial cells, were collected by headspace solid-phase microextraction (HS-SPME) and analyzed by gas chromatography combined with mass spectrometry (GC-MS), thus defining a volatile metabolomic signature...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28256295/kinetic-and-molecular-analyses-reveal-isoprene-degradation-potential-of-methylobacterium-sp
#14
Navnita Srivastva, P Vishwakarma, Y Bhardwaj, A Singh, K Manjunath, Suresh K Dubey
Efforts were made to isolate and characterize bacteria capable of growing on methane and organic compounds, and to achieve the simultaneous degradation of more than one pollutant. Among the methanotrophs, species of Methylobacterium was able to catabolize a variety of hydrocarbons, including the branched-chain alkenes. Therefore, laboratory incubations experiments were carried out in batch mode to assess the potential of Methylobacterium sp. PV1 for degrading isoprene, the low-molecular-weight alkene, the most abundant non-methane volatile hydrocarbon present in the environment...
February 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28247041/volatile-organic-compounds-in-exhaled-breath-of-idiopathic-pulmonary-fibrosis-for-discrimination-from-healthy-subjects
#15
Yu-Ichi Yamada, Gen Yamada, Mitsuo Otsuka, Hirotaka Nishikiori, Kimiyuki Ikeda, Yasuaki Umeda, Hirofumi Ohnishi, Koji Kuronuma, Hirofumi Chiba, Jörg Ingo Baumbach, Hiroki Takahashi
Purpose Human breath analysis is proposed with increasing frequency as a useful tool in clinical application. We performed this study to find the characteristic volatile organic compounds (VOCs) in the exhaled breath of patients with idiopathic pulmonary fibrosis (IPF) for discrimination from healthy subjects. Methods VOCs in the exhaled breath of 40 IPF patients and 55 healthy controls were measured using a multi-capillary column and ion mobility spectrometer. The patients were examined by pulmonary function tests, blood gas analysis, and serum biomarkers of interstitial pneumonia...
March 1, 2017: Lung
https://www.readbyqxmd.com/read/28245982/comparative-analysis-of-microrna-and-mrna-expression-profiles-in-cells-and-exosomes-under-toluene-exposure
#16
Jung-Hee Lim, Mi-Kyung Song, Yoon Cho, Woong Kim, Sung Ok Han, Jae-Chun Ryu
Recent studies have illustrated the growing importance of exosomes (small extracellular vesicles) and their constituent microRNAs (miRNAs) in the fields of toxicology and pathology. The mechanism of toxicity of toluene, a highly-prevalent and volatile organic compound, is largely unknown. To examine the role of miRNAs in toluene-induced toxicity, we investigated miRNAs and toluene-induced gene expression in HL-60 human promyelocytic leukemia cells and exosomes using microarrays. A total of 54 miRNAs were differentially expressed in HL-60 cell lines exposed to toluene and exosomes from the cells...
February 27, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28244881/oral-or-nasal-breathing-real-time-effects-of-switching-sampling-route-onto-exhaled-voc-concentrations
#17
Pritam Sukul, Peter Oertel, Svend Kamysek, Phillip Trefz
There is a need for standardisation in sampling and analysis of breath volatile organic compounds (VOCs) in order to minimise ubiquitous confounding effects. Physiological factors may mask concentration changes induced by pathophysiological effects. In humans, unconscious switching of oral and nasal breathing can occur during breath sampling, which may affect VOC patterns. Here, we investigated exhaled VOC concentrations in real-time while switching breathing routes. Breath from 15 healthy volunteers was analysed continuously by proton transfer reaction time-of-flight mass spectrometry during paced breathing (12 breaths min(-1))...
March 21, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28239876/the-potential-of-volatile-organic-compounds-for-the-detection-of-active-disease-in-patients-with-ulcerative-colitis
#18
A Smolinska, A G L Bodelier, J W Dallinga, A A M Masclee, D M Jonkers, F-J van Schooten, M J Pierik
BACKGROUND: To optimise treatment of ulcerative colitis (UC), patients need repeated assessment of mucosal inflammation. Current non-invasive biomarkers and clinical activity indices do not accurately reflect disease activity in all patients and cannot discriminate UC from non-UC colitis. Volatile organic compounds (VOCs) in exhaled air could be predictive of active disease or remission in Crohn's disease. AIM: To investigate whether VOCs are able to differentiate between active UC, UC in remission and non-UC colitis...
February 26, 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28236484/characterization-and-source-profiling-of-volatile-organic-compounds-in-indoor-air-of-private-residences-in-selangor-state-malaysia
#19
Nobumitsu Sakai, Shuta Yamamoto, Yasuto Matsui, Md Firoz Khan, Mohd Talib Latif, Mustafa Ali Mohd, Minoru Yoneda
Volatile Organic Compounds (VOCs) in indoor air were investigated at 39 private residences in Selangor State, Malaysia to characterize the indoor air quality and to identify pollution sources. Twenty-two VOCs including isomers (14 aldehydes, 5 aromatic hydrocarbons, acetone, trichloroethylene and tetrachloroethylene) were collected by 2 passive samplers for 24h and quantitated using high performance liquid chromatography and gas chromatography mass spectrometry. Source profiling based on benzene/toluene ratio as well as statistical analysis (cluster analysis, bivariate correlation analysis and principal component analysis) was performed to identify pollution sources of the detected VOCs...
May 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28224910/identification-of-sink-spots-in-two-thermal-desorption-gc-ms-systems-for-the-analysis-of-polycyclic-aromatic-hydrocarbons
#20
Yingjie Li, Jiping Zhu
Thermal desorption (TD) GC/MS has been used for the analysis of polycyclic aromatic hydrocarbons (PAHs) and other semi-volatile organic compounds. However, thermal desorption recovery of PAHs have not been well studied and the cause of PAH residues in a TD system has not been clearly understood. Our results showed that low volatility of PAHs can lead to their incomplete recovery in a TD system: for the PAHs with low vapour pressures, up to 10% and 3% could be lost in a two-stage (TS) TD system and a short-path (SP) TD system, respectively...
April 8, 2017: Analytica Chimica Acta
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