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https://www.readbyqxmd.com/read/28100886/characterization-of-volatile-compounds-with-hs-spme-from-oxidized-n-3-pufa-rich-oils-via-rancimat-tests
#1
Kai-Min Yang, Ming-Ching Cheng, Chih-Wei Chen, Chin-Yin Tseng, Li-Yun Lin, Po-Yuan Chiang
Algae oil and fish oil are n-3 PUFA mainstream commercial products. The various sources for the stability of n-3 PUFA oxidation are influenced by the fatty acid composition, extraction and refined processing. In this study, the oil stability index (OSI) occurs within 2.3 to 7.6 hours with three different n-3 PUFA rich oil. To set the OSI in the Rancimat test as the oil stability limit and observed various degrees of oxidation (0, 25, 50, 75, 100 and 125%). The volatile oxidation compounds were analyzed via headspace-solid phase microextraction (HS-SPME) and GC/MS...
January 18, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28098834/volatile-compound-profiling-by-hs-spme-gc-ms-fid-of-a-core-olive-cultivar-collection-as-a-tool-for-aroma-improvement-of-virgin-olive-oil
#2
Lourdes García-Vico, Angjelina Belaj, Araceli Sánchez-Ortiz, José M Martínez-Rivas, Ana G Pérez, Carlos Sanz
Virgin olive oil (VOO) is the only food product requiring official sensory analysis to be classified in commercial categories, in which the evaluation of the aroma plays a very important role. The selection of parents, with the aim of obtaining new cultivars with improved oil aroma, is of paramount importance in olive breeding programs. We have assessed the volatile fraction by headspace-solid-phase microextraction/gas chromatography-mass spectrometry-flame ionization detection (HS-SPME/GC-MS-FID) and the deduced aroma properties of VOO from a core set of olive cultivars (Core-36) which possesses most of the genetic diversity found in the World Olive Germplasm Collection (IFAPA Alameda del Obispo) located in Cordoba, Spain...
January 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28093206/urea-formaldehyde-monolithic-column-for-hydrophilic-in-tube-solid-phase-microextraction-of-aminoglycosides
#3
Jiabin Wang, Qi Zhao, Nan Jiang, Wenbang Li, Li Chen, Xucong Lin, Zenghong Xie, Lijun You, Qiqing Zhang
A novel urea-formaldehyde (UF) monolithic column has been developed and exploited as a sorbent for hydrophilic in-tube solid-phase microextraction (in-tube SPME) of aminoglycosides (AGs). Because of the innate hydrophilicity, UF monolith showed high extraction efficiency towards these hydrophilic analytes. The adsorption capacities for target compounds dissolved in water/ACN (1:1, v/v) were in the range of 5.18-7.36μg/cm. Due to the lack of a chromophore, evaporative light scattering detector (ELSD) was selected as the detector for AGs, and coupled with the online in-tube SPME-HPLC system...
January 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28078517/semivolatile-organic-compounds-in-surface-microlayer-and-subsurface-water-of-dianshan-lake-shanghai-china-implications-for-accumulation-and-interrelationship
#4
Ming-Hong Wu, Xue-Xia Yang, Gang Xu, Chen-Jing Que, Si-Han Ma, Liang Tang
Semivolatile organic compounds (SVOCs) in surface microlayer (SML) and subsurface water (SSW) from Dianshan Lake were studied to investigate their occurrence, distributions, as well as enrichment and potential sources. A sample was concentrated by solid-phase micro-extraction (SPME). Identification and quantification were carried out by gas chromatography coupled to mass spectrometry (GC-MS). Total SVOCs concentrations ranged from 25.93 to 47.49 μg/L in SSW and 38.19 to 77.23 μg/L in SML. The phthalic acid esters (PAE) concentrations in both SSW and SML are the highest of the total SVOC...
January 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28078414/application-of-hs-spme-gc-ms-method-for-the-detection-of-active-moulds-on-historical-parchment
#5
Tomasz Sawoszczuk, Justyna Syguła-Cholewińska, Julio M Del Hoyo-Meléndez
The goal of this work was to analyse the profile of microbial volatile organic compounds (MVOCs) emitted by moulds growing on parchment samples, in search of particular volatiles mentioned in the literature as indicators of active mould growth. First, the growth of various moulds on samples of parchment was assessed. Those species that showed collagenolytic activity were then inoculated on two types of media: samples of parchment placed on media and on media containing amino acids that are elements of the structure of collagen...
January 11, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28076838/identification-of-mdmb-fubinaca-in-commercially-available-e-liquid-formulations-sold-for-use-in-electronic-cigarettes
#6
Michelle R Peace, Rose I Krakowiak, Carl E Wolf, Alphonse Poklis, Justin L Poklis
MDMB-FUBINACA (aka MDMB(N)-Bz-F), chemical name Methyl (S)-2-(1-(4-fluorobenzyl)-1H-indazole-3-carboxamido)-3,3-dimethylbutanoate, a designer drug or a new psychoactive substance (NPS), was identified in three commercially available e-liquids formulated for electronic cigarette use. The e-liquids were evaluated using direct analysis in real time ion source attached to a time of flight mass spectrometer (DART-MS) and gas chromatograph mass spectrometer (GC-MS) to identify active ingredients/drugs, flavorants, and other possible constituents...
December 27, 2016: Forensic Science International
https://www.readbyqxmd.com/read/28076773/thymol-detection-and-quantitation-by-solid-phase-microextraction-in-faeces-and-egg-yolk-of-japanese-quail
#7
María E Fernandez, Marcela A Palacio, María C Labaque
To measure bioavailability of the active ingredients of phytogenic feed additives in poultry products and subproducts is a key element for developing a rational understanding of its mode of action and biological effects. Hence, we validated a headspace solid phase microextraction (HS-SPME) technique followed by gas chromatography-mass spectrometry as an analytical extraction procedure and as method for detection and quantitation of 2-Isopropyl-5-methylphenol (thymol) in faeces and egg yolk of quail. The suitability of this method for thymol analysis in both matrices was first proved via linearity, limit of detection, limit of quantification, and recovery using m-cresol as internal standard...
December 31, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28067117/furan-in-commercial-baby-foods-from-the-spanish-market-estimation-of-daily-intake-and-risk-assessment
#8
M S Altaki, F J Santos, L Puignou, M T Galceran
The occurrence of furan in commercial baby food samples from the Spanish market was evaluated using an automated headspace solid-phase microextraction method coupled to gas chromatography-mass spectrometry (HS-SPME-GC-MS). A total of seventy six baby food samples including infant formula, baby cereals, fruit in cans and/or jars, vegetables, meat, and fish, were surveyed for furan content. The lowest concentration of this compound was found in infant formula (<0.02 - 0.33 ng mL(-1)), and cereal-based food (0...
January 9, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28064492/influence-of-winemaking-processing-steps-on-the-amounts-of-e-2-decenal-and-tridecane-as-off-odorants-caused-by-brown-marmorated-stink-bug-halyomorpha-halys
#9
Pallavi Mohekar, James Osborne, Nik G Wiman, Vaughn Walton, Elizabeth Tomasino
Brown marmorated stink bugs (BMSB) release stress compounds, tridecane and (E)-2-decenal, that effect final wine quality. This study focuses on determining the effect of wine processing on (E)-2-decenal and tridecane release in both red and white wines. Wines were produced by adding live BMSB to grape clusters at densities of 0, 0.3, 1 and 3 bugs per cluster. Compound concentrations were measured using HS-SPME-MDGC-MS. For red wines, the highest levels of stress compounds were found using 3 BMSB/cluster (tridecane, 614 µg/L and (E)-2-decenal, 2...
January 8, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28063640/in-situ-hydrothermal-growth-of-polyaniline-coating-for-in-tube-solid-phase-microextraction-towards-ultraviolet-filters-in-environmental-water-samples
#10
Yanan Bu, Juanjuan Feng, Xiuqin Wang, Yu Tian, Min Sun, Chuannan Luo
A facile, low cost, sensitive and environmentally friendly polyaniline (PANI) coating was prepared onto the basalt fibers (BFs) by in situ hydrothermal growth method. PANI functionalized BFs were placed into a poly(ether ether ketone) (PEEK) tube as a fibers-in-tube solid-phase microextraction (SPME) device. The extraction and analysis processes were carried out by connecting it to high performance liquid chromatography (HPLC). Three ultraviolet filters including 2-hydroxy-4-methoxybenzophenone, phenyl salicylate and 2,4-dihydroxybenzophenone were employed as model analytes...
December 29, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28054014/data-on-green-tea-flavor-determinantes-as-affected-by-cultivars-and-manufacturing-processes
#11
Zhuo-Xiao Han, Mohammad M Rana, Guo-Feng Liu, Ming-Jun Gao, Da-Xiang Li, Fu-Guang Wu, Xin-Bao Li, Xiao-Chun Wan, Shu Wei
This paper presents data related to an article entitled "Green tea flavor determinants and their changes over manufacturing processes" (Han et al., 2016) [1]. Green tea samples were prepared with steaming and pan firing treatments from the tender leaves of tea cultivars 'Bai-Sang Cha' ('BAS') and 'Fuding-Dabai Cha' ('FUD'). Aroma compounds from the tea infusions were detected and quantified using HS-SPME coupled with GC/MS. Sensory evaluation was also made for characteristic tea flavor. The data shows the abundances of the detected aroma compounds, their threshold values and odor characteristics in the two differently processed tea samples as well as two different cultivars...
February 2017: Data in Brief
https://www.readbyqxmd.com/read/28052192/fish-in-vitro-digestion-influence-of-fish-salting-on-the-extent-of-lipolysis-oxidation-and-other-reactions
#12
Bárbara Nieva-Echevarria, Encarnacion Goicoechea, Maria J Manzanos, María D Guillén
A study of the various chemical reactions which take place during fish in vitro digestion and the potential effect of fish salting on their extent is addressed for the first time. Farmed European sea bass fillets, raw, brine-salted or dry-salted, were digested using a gastrointestinal in vitro model. Fish lipid extracts before and after digestion were analyzed by 1H NMR, and the headspace composition of the digestates was investigated by SPME-GC/MS. During digestion not only lipolysis, but also fish lipid oxidation took place...
January 4, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28035708/solid-phase-microextraction-of-methadone-in-urine-samples-by-electrochemically-co-deposited-sol-gel-cu-nanocomposite-fiber
#13
Sirwan Mohammadiazar, Fatemeh Hasanli, Mehdi Maham, Somayeh Payami Samarin
Electrochemically co-deposited sol-gel/Cu nanocomposites has been introduced as a novel, simple and single step technique for preparation of solid phase microextraction coating to extract methadone (MDN) (a synthetic opioid) in urine samples. The porous surface structure of the sol-gel/Cu nanocomposite coating was revealed by scanning electron microscopy (SEM). Direct immersion-solid phase microextraction (DI-SPME) followed by HPLC-UV determination was employed. The factors influencing the SPME procedure such as the salt content, desorption solvent type, pH and equilibration time were optimized...
December 30, 2016: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28028595/comprehensive-two-dimensional-gas-chromatographic-profiling-and-chemometric-interpretation-of-the-volatile-profiles-of-sweat-in-knit-fabrics
#14
A Paulina de la Mata, Rachel H McQueen, Seo Lin Nam, James J Harynuk
Human axillary sweat is a poorly explored biofluid within the context of metabolomics when compared to other fluids such as blood and urine. In this paper, we explore the volatile organic compounds emitted from two different types of fabric samples (cotton and polyester) which had been worn repeatedly during exercise by participants. Headspace solid-phase microextraction (SPME) and comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GC×GC-TOFMS) were employed to profile the (semi)volatile compounds on the fabric...
December 27, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28017564/rapid-and-sensitive-analysis-of-polychlorinated-biphenyls-and-acrylamide-in-food-samples-using-ionic-liquid-based-in-situ-dispersive-liquid-liquid-microextraction-coupled-to-headspace-gas-chromatography
#15
Cheng Zhang, Cecilia Cagliero, Stephen A Pierson, Jared L Anderson
A simple and rapid ionic liquid (IL)-based in situ dispersive liquid-liquid microextraction (DLLME) method was developed and coupled to headspace gas chromatography (HS-GC) employing electron capture (ECD) and mass spectrometry (MS) detection for the analysis of polychlorinated biphenyls (PCBs) and acrylamide at trace levels from milk and coffee samples. The chemical structures of the halide-based ILs were tailored by introducing various functional groups to the cations to evaluate the effect of different structural features on the extraction efficiency of the target analytes...
December 8, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28012588/determination-of-biogenic-amines-in-canned-fish-samples-using-head-space-solid-phase-microextraction-based-on-nanostructured-polypyrrole-fiber-coupled-to-modified-ionization-region-ion-mobility-spectrometry
#16
Razieh Parchami, Mahdie Kamalabadi, Naader Alizadeh
The head-space solid phase microextraction (HS-SPME) was applied to extraction and determination of histamine (HIS), putrescine (PUT), cadaverine (CAD), tyramine (TYR) in canned fish samples by ion mobility spectrometry (IMS) without any derivatization process. HIS and CAD have the same mobilities in nitrogen as buffer gas and their corresponding peaks are severely overlapped in ion mobility spectrum. Peak separation was acquired in the presence of 18-crown-6 vapor as complexation reagent into carrier gas and modified ionization region of IMS (MIR-IMS) at optimum flow rate...
December 16, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28009446/distribution-of-enantiomers-of-volatile-organic-compounds-in-selected-fruit-distillates
#17
Olga Vyviurska, Helena Zvrškovcová, Ivan Špánik
The enantiomer ratios of chiral volatile organic compounds in fruit distillates were determined by multidimensional gas chromatography using solid-phase microextraction (SPME) as a sample treatment procedure. Linalool and its oxides, limonene, α-terpineol, and nerolidol, were present at the highest concentration levels, while significantly lower amounts of β-citronellol and lactones were found in the studied samples. However, almost all terpenoids mainly occur as a racemic or near-racemic mixture; enantiomer distribution of some chiral organic compounds in fruit distillates correlated to a botanical origin...
December 23, 2016: Chirality
https://www.readbyqxmd.com/read/28004610/endogenous-level-of-acetic-acid-in-yellowfin-tuna-thunnus-albacares-a-pilot-study-about-a-possible-controversy-on-its-residue-nature
#18
Luca Maria Chiesa, Elisa Pasquale, Sara Panseri, Domenico Britti, Renato Malandra, Roberto Villa, Francesco Arioli
A method based on headspace solid-phase microextraction (SPME) followed by GC-MS analysis was developed for the determination of underivatized acetic acid in fresh tuna fish muscle. Parameters such as the fibre selected and the extraction time and temperature were optimised and the linearity, detection limits and precision of the whole analytical procedure were assessed. The method was then applied to determine the acetic acid concentration in fresh Yellowfin tuna muscles (Thunnus albacares), in order to evaluate the endogenous level and its variations during the shelf life under different storage conditions...
December 22, 2016: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28002928/volatile-compounds-and-some-physico-chemical-properties-of-past%C3%A4-rma-produced-with-different-nitrate-levels
#19
Ahmet Akköse, Nazen Unal, Barış Yalinkiliç, Güzin Kaban, Mükerrem Kaya
Objective: The aim of the study was to evaluate the effects of different nitrate levels (150, 300, 450 and 600 ppm KNO3) on the volatile compounds and some other properties of pastırma. Methods: Pastırma samples were produced under the controlled condition and analyses of volatile compounds, and TBARS as an indicator of lipid oxidation, non-protein nitrogenous matter content as an indicator of proteolysis, color and residual nitrite were carried out on the final product...
December 17, 2016: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28001349/in-situ-hydrothermally-grown-tio2-c-core-shell-nanowire-coating-for-highly-sensitive-solid-phase-microextraction-of-polycyclic-aromatic-hydrocarbons
#20
Fuxin Wang, Juan Zheng, Junlang Qiu, Shuqin Liu, Guosheng Chen, Yexiang Tong, Fang Zhu, Gangfeng Ouyang
Nanostructured materials have great potential for solid phase microextraction (SPME) on account of their tiny size, distinct architectures and superior physical and chemical properties. Herein, a core-shell TiO2@C fiber for SPME was successfully fabricated by the simple hydrothermal reaction of a titanium wire and subsequent amorphous carbon coating. The readily hydrothermal procedure afforded in situ synthesis of TiO2 nanowires on a titanium wire and provided a desirable substrate for further coating of amorphous carbon...
January 18, 2017: ACS Applied Materials & Interfaces
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