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https://www.readbyqxmd.com/read/28530580/offgel-electrophoresis-and-tandem-mass-spectrometry-approach-compared-with-dna-based-pcr-method-for-authentication-of-meat-species-from-raw-and-cooked-ground-meat-mixtures-containing-cattle-meat-water-buffalo-meat-and-sheep-meat
#1
Basappa M Naveena, Deepak S Jagadeesh, A Jagadeesh Babu, T Madhava Rao, Veeranna Kamuni, S Vaithiyanathan, Vinayak V Kulkarni, Srikanth Rapole
The present study compared the accuracy of an OFFGEL electrophoresis and tandem mass spectrometry-based proteomic approach with a DNA-based method for meat species identification from raw and cooked ground meat mixes containing cattle, water buffalo and sheep meat. The proteomic approach involved the separation of myofibrillar proteins using OFFGEL electrophoresis, SDS-PAGE and protein identification by MALDI-TOF MS. Species-specific peptides derived from myosin light chain-1 and 2 were identified for authenticating buffalo meat spiked at a minimum 0...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28528106/characterization-of-white-tea-metabolome-comparison-against-green-and-black-tea-by-a-nontargeted-metabolomics-approach
#2
Weidong Dai, Dongchao Xie, Meiling Lu, Pengliang Li, Haipeng Lv, Chen Yang, Qunhua Peng, Yin Zhu, Li Guo, Yue Zhang, Junfeng Tan, Zhi Lin
White tea is considered the least processed form of tea and is reported to have a series of potent bioactivities, such as antioxidant, anti-inflammatory, anti-mutagenic, and anti-cancer activities. However, the chemical composition of white tea and the dynamic changes of the metabolites during the manufacturing process are far from clear. In this study, we applied a nontargeted metabolomics approach based on ultra-high performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UHPLC-QTOF/MS) to comprehensively profile the characteristic metabolites of white tea...
June 2017: Food Research International
https://www.readbyqxmd.com/read/28524783/quantitative-analysis-of-veterinary-drugs-in-bovine-muscle-and-milk-by-liquid-chromatography-quadrupole-time-of-flight-mass-spectrometry
#3
Shizuka Saito-Shida, Takatoshi Sakai, Satoru Nemoto, Hiroshi Akiyama
A simple and reliable multiresidue method for quantitative determination of veterinary drugs in bovine muscle and milk using liquid chromatography quadrupole time-of-flight mass spectrometry (LC-QTOF-MS) was developed. Critical MS parameters such as capillary voltage, cone voltage, collision energy, desolvation gas temperature, and extraction mass window were carefully optimised to obtain the best possible sensitivity. Analytical samples were prepared using extraction with acetonitrile and hexane in the presence of anhydrous sodium sulphate and acetic acid, followed by ODS cartridge clean-up...
May 19, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28513568/using-uplc-ms-ms-for-characterization-of-active-components-in-extracts-of-yupingfeng-and-application-to-a-comparative-pharmacokinetic-study-in-rat-plasma-after-oral-administration
#4
Meng-Qi Jia, Ye-Juan Xiong, Yun Xue, Yan Wang, Chao Yan
Yupingfeng (YPF), a famous traditional Chinese medicine, which contains a large array of compounds, has been effectually used in health protection. A two-dimensional liquid chromatography (²D-LC) combined with quadrupole time-of-flight mass spectrometry (QTOF-MS) method was firstly established to separate and identify chemical components in YPF. A total of 33 compounds were identified, including 15 constituents (flavonoids and saponins) in Astragali radix; seven constituents (sesquiterpenoids and polysaccharide) in Atractylodis rhizoma; and 11 constituents (chromone and coumarins) in Saposhnikoviae radix...
May 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28511119/effects-of-breviscapine-on-amyloid-beta-1-42-induced-alzheimer-s-disease-mice-a-hplc-qtof-ms-based-plasma-metabonomics-study
#5
Hongjun Xia, Lingling Wu, Mengying Chu, Huimin Feng, Chunliang Lu, Qinghe Wang, Minghai He, Xiaoqun Ge
Herba Erigerontis has long been used to cure apoplexy hemiplegia and precordial pain in China. In addition, the bioactivities of its total flavonoids-breviscapine included inhibiting amyloid beta (Aβ) fibril formation, antioxidation and metal chelating, which are beneficial to treat Alzheimer's disease (AD). Hence, A HPLC-QTOF-MS based plasma metabonomics approach was applied to investigate the neuroprotective effects of breviscapine on intracerebroventricular injection of aggregated Aβ 1-42 induced AD mice for the first time in the study...
July 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28511043/environmental-behavior-of-12-uv-filters-and-photocatalytic-profile-of-ethyl-4-aminobenzoate
#6
Adela Jing Li, Ziye Sang, Chi-Hang Chow, Japhet Cheuk-Fung Law, Ying Guo, K S-Y Leung
Ethyl-4-aminobenzoate (Et-PABA) is currently used as a substitute for 4-aminobenzoate (PABA) in sunscreens and anesthetic ointments. Despite its widespread use and hydrophilicity, Et-PABA has never been found in environmental waters. This study, probed the occurrence of Et-PABA in both seawater and drinking water sources in Hong Kong, and evaluated its transformation products (TPs) and environmental fate via cumulative potency and photocatalytic profile analyses. Another 11 UV filters used in skin-care products were also studied...
April 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28506719/two-fatalities-associated-with-synthetic-opioids-ah-7921-and-mt-45
#7
Helena Fels, Julia Krueger, Hans Sachs, Frank Musshoff, Matthias Graw, Gabriele Roider, Andreas Stoever
In this study, two fatalities associated with the synthetic opioids AH-7921 and MT-45 are reported. Within the last few years, both compounds have emerged on the recreational drug market and are sold as "research chemicals" on the internet. In the first case, a 22-year-old woman was found dead in the bedroom of her apartment by two of her friends. A plastic bag labeled "AH-7921" was found in the apartment and the two friends stated that the deceased had consumed AH-7921 prior to her death. The woman was a known drug addict...
April 15, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28506062/lc-ms-untargeted-metabolomics-to-explain-the-signal-metabolites-inducing-browning-in-fresh-cut-lettuce
#8
Carlos J Garcia, Rocio Garcia-Villalba, Maria I Gil, Francisco A Tomas-Barberan
Enzymatic browning is one of the main causes of quality loss in lettuce as a prepared and ready-to-eat cut salad. An untargeted metabolomics approach using UPLC-ESI-QTOF-MS was performed to explain the wound response of lettuce after cutting and to identify the metabolites responsible of browning. Two cultivars of Romaine lettuce with different browning susceptibilities were studied at short time intervals after cutting. From the total 5975 entities obtained from the raw data after alignment, filtration reduced the number of features to 2959, and the statistical analysis found that only 1132 entities were significantly different...
May 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28501749/characterization-of-flavonol-mono-di-tri-and-tetra-o-glycosides-by-ultra-performance-liquid-chromatography-electrospray-ionization-quadrupole-time-of-flight-mass-spectrometry-and-its-application-for-identification-of-flavonol-glycosides-in-viola-tianschanica
#9
Yan Qin, Boyan Gao, Haiming Shi, Jie Cao, Chengle Yin, Weiying Lu, Liangli Yu, Zhihong Cheng
In this study, 21 flavonol O-glycoside standards including flavonol mono-, di-, tri- and tetra-O-glycosides have been systematically studied by ultra-high performance liquid chromatography-electrospray ionization-quadrupole time-of-flight mass spectrometry (UPLC-ESI-QTOF-MS/MS) in the negative ionization mode to analyze their fragmentation patterns. Here for the first time, the Z2(3-) fragment (corresponding to the loss of C-2" terminal sugar moiety) was observed in MS/MS spectra of flavonol 3-O-triglycosides...
May 5, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28501176/liquid-chromatography-high-resolution-mass-spectrometric-methods-for-the-surveillance-monitoring-of-cyanotoxins-in-freshwaters
#10
Sara Bogialli, Claudio Bortolini, Iole Maria Di Gangi, Federica Nigro Di Gregorio, Luca Lucentini, Gabriella Favaro, Paolo Pastore
A comprehensive risk management on human exposure to cyanotoxins, whose production is actually unpredictable, is limited by reliable analytical tools for monitoring as many toxic algal metabolites as possible. Two analytical approaches based on a LC-QTOF system for target analysis and suspect screening of cyanotoxins in freshwater were presented. A database with 369 compounds belonging to cyanobacterial metabolites was developed and used for a retrospective data analysis based on high resolution mass spectrometry (HRMS)...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28499205/comparative-metabolomics-analysis-for-the-compatibility-and-incompatibility-of-kansui-and-licorice-with-different-ratios-by-uhplc-qtof-ms-and-multivariate-data-analysis
#11
Juan Shen, Zong-Jin Pu, Jun Kai, An Kang, Yu-Ping Tang, Li-Li Shang, Gui-Sheng Zhou, Zhen-Hua Zhu, Er-Xin Shang, Shao-Ping Li, Yu-Jie Cao, Wei-Wei Tao, Shu-Lan Su, Li Zhang, Huiping Zhou, Da-Wei Qian, Jin-Ao Duan
Kansui, the root of Euphorbia kansui T.N. Liou ex T.P. Wang (Euphorbiaceae), is a well-known poisonous traditional Chinese medicine (TCM). However, many monographs of TCM indicated that it cannot be co-used with licorice, as kansui-licorice is a typical "eighteen incompatible" medicaments. Our previous studies have indicated that kansui was effective in treating malignant pleural effusion (MPE), and the efficacy could be weakened by the co-use of licorice, even causing serious toxicity at the given ratio. Nevertheless, the actual mechanisms of their dosage-toxicity-efficacy relationship need to be well clarified...
July 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28495097/workflow-development-for-targeted-lipidomic-quantification-using-parallel-reaction-monitoring-on-a-quadrupole-time-of-flight-mass-spectrometry
#12
Juntuo Zhou, Chunlei Liu, Dandan Si, Bing Jia, Lijun Zhong, Yuxin Yin
Advances in high-resolution mass spectrometers with faster scanning capabilities and higher sensitivities have expanded these instruments' functionality beyond traditional data-dependent acquisition in targeted metabolomics. Apart from the traditional multiple reaction monitoring strategy, the parallel reaction monitoring (PRM) strategy is also used for targeted metabolomics quantification. The high resolution and mass accuracy of full-scan (MS1) and tandem mass spectrometry (MS/MS) scan result in sufficient selectivity by monitoring all MS/MS fragment ions for each target precursor and simultaneously providing flexibility in assay method construction and post-acquisition data analysis...
June 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28494203/carbofuran-degraded-by-iron-doped-anatase-weakening-the-cholinesterase-inhibitory-activity-in-the-photoproducts-mixture
#13
Martín M Dávila-Jiménez, María P Elizalde-González, Esmeralda García-Díaz, Miguel González, M E Mendoza, M J Robles-Águila
Carbofuran is a toxic carbamate pesticide, and its use has increased in recent years. While marketing information indicates stability in different chemical media, carbofuran exhibits relative photolability. The aim of this research was to decompose carbofuran and to identify the photoproducts achieved when two different doped titania photocatalysts were employed under UV irradiation. The iron-doped TiO2 materials were obtained (a) via a hydrothermal method and (b) by an ultrasound-assisted sol-gel method. The precursors were TiOSO4⋅xH2O and Fe3(NO3)·9H2O...
May 11, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28489938/metabolites-contributing-to-rhizoctonia-solani-ag-1-ia-maturation-and-sclerotial-differentiation-revealed-by-uplc-qtof-ms-metabolomics
#14
Wenjin Hu, Xinli Pan, Hafiz Muhammad Khalid Abbas, Fengfeng Li, Wubei Dong
Rhizoctonia solani is a causative agent of sheath blight, which results in huge economic losses every year. During its life cycle, the formation of sclerotia helps Rhizoctonia solani withstand a variety of unfavorable factors. Oxidative stress is a key factor that induces sclerotium formation. The differentiated and undifferentiated phenotypes of R. solani AG-1-IA were obtained by controlling aerial conditions. Metabolomics based on the mass spectrometry technique combined with multivariate and univariate analyses was used to investigate the metabolic variation in vegetative, differentiated and undifferentiated mycelia...
2017: PloS One
https://www.readbyqxmd.com/read/28487121/multiple-heart-cutting-two-dimensional-liquid-chromatography-quadrupole-time-of-flight-mass-spectrometry-of-pyrrolizidine-alkaloids
#15
Milou G M van de Schans, Marco H Blokland, Paul W Zoontjes, Patrick P J Mulder, Michel W F Nielen
Pyrrolizidine alkaloids (PAs) and their and the corresponding N-oxides (PAs-ox) are genotoxic plant metabolites which can be present as unwanted contaminants in food products of herbal origin like tea and food supplements. PAs and PAs-ox come in a wide variety of molecular structures including many structural isomers. For toxicity assessment it is important to determine the composition of a sample and to resolve all isomeric PAs and PAs-ox, which is currently not possible in one liquid or gas chromatographic (LC or GC) run...
April 29, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28473744/untargeted-metabolomics-reveals-a-mild-impact-of-remote-ischemic-conditioning-on-the-plasma-metabolome-and-%C3%AE-hydroxybutyrate-as-a-possible-cardioprotective-factor-and-biomarker-of-tissue-ischemia
#16
Mia Roest Laursen, Jakob Hansen, Casper Elkjær, Ninna Stavnager, Camilla Bak Nielsen, Kasper Pryds, Jacob Johnsen, Jan Møller Nielsen, Hans Erik Bøtker, Mogens Johannsen
INTRODUCTION: Remote ischemic conditioning (RIC) is a maneuver by which short non-lethal ischemic events are applied on distant organs or limbs to reduce ischemia and reperfusion injuries caused by e.g. myocardial infarct. Although intensively investigated, the specific mechanism of this protective phenomenon remains incompletely understood and in particular, knowledge on the role of small metabolites is scarce. OBJECTIVES: In this study, we aimed to study perturbations in the plasma metabolome following RIC and gain insight into metabolic changes by the intervention as well as to identify potential novel cardio-protective metabolites...
2017: Metabolomics: Official Journal of the Metabolomic Society
https://www.readbyqxmd.com/read/28468304/rapid-quantification-and-quantitation-of-alkaloids-in-xinjiang-fritillaria-by-ultra-performance-liquid-chromatography-quadrupole-time-of-flight-mass-spectrometry
#17
Aziz Mohammat, Abulimiti Yili, Haji Akber Aisa
The Fritillaria genus, including different kinds of medicinal and edible plants belonging to the Liliaceae family which have the function of treating and relieving a cough and eliminating phlegm, is widely planted in Xinjiang (China). There are few comprehensive studies reporting on the characterization of the chemical constituents of Fritillaria from Xinjiang, and to date, no work describing the quantitative differences between the components in Fritillaria from Xinjiang and related species. The purpose of this study was to develop qualitative and quantitative analytical methods by Ultra Performance Liquid Chromatography-Quadrupole Time-of-flight Mass Spectrometry (UPLC-QTOF-MS) for the rapid quantification and quantitation of alkaloids in wild and cultivated Xinjiang Fritillaria, which could be used in the quality control of medicine based on this natural herb...
May 1, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28468295/chemical-comparison-of-two-drying-methods-of-mountain-cultivated-ginseng-by-uplc-qtof-ms-ms-and-multivariate-statistical-analysis
#18
Xin-Fang Xu, Shu-Ya Xu, Ying Zhang, Hui Zhang, Meng-Nan Liu, Huan Liu, Yan Gao, Xue Xue, Hui Xiong, Rui-Chao Lin, Xiang-Ri Li
In traditional Chinese medicine practice, drying method is an essential factor to influence the components of Chinese medicinal herbs. In this study, an ultra-performance liquid chromatography quadrupole time-of-flight tandem mass spectrometry (UPLC-QTOF-MS/MS)-based approach was used to compare the content of chemical compounds of mountain cultivated ginseng that had been natural air dried (LX-P) and vacuum freeze-dried (LX-L). Multivariate statistical analysis such as principal component analysis (PCA) and supervised orthogonal partial least squared discrimination analysis (OPLS-DA) were used to select the influential components of different samples...
April 30, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28462135/comparison-of-antioxidant-antimicrobial-activities-and-chemical-profiles-of-three-coffee-coffea-arabica-l-pulp-aqueous-extracts
#19
Acharaporn Duangjai, Nungruthai Suphrom, Jukkrit Wungrath, Atcharaporn Ontawong, Nitra Nuengchamnong, Atchariya Yosboonruang
BACKGROUND: This study explored the bioactivities and nutrient compositions of coffee (Coffea Arabica L.) pulp which was prepared in three different ways [Coffee Pulp Extracts (CPE) 1-3]. METHODS: The coffee pulp was prepared in three different ways by distinct selecting and freezing processes. The nutritional values, polyphenol contents, antioxidant activity, and antibacterial properties of the coffee pulp as well as the characterization of the active ingredients by liquid chromatography-electrospray ionization-quadrupole-time-of-flight mass spectrometry (LC-ESI-Q-TOF-MS) were evaluated...
December 2016: Integr Med Res
https://www.readbyqxmd.com/read/28460962/metabolic-profiling-discriminates-between-strawberry-fragaria%C3%A3-ananassa-duch-cultivars-grown-in-finland-or-estonia
#20
Anna Kårlund, Ulvi Moor, Gordon McDougall, Marko Lehtonen, Reijo O Karjalainen, Kati Hanhineva
Metabolic profiling analysis with LC-ESI-QTOF-MS was utilized to separate and identify 186 putative major metabolites demonstrating significantly different levels in 15 strawberry cultivars grown in Finland or Estonia. Principal component analysis showed close clustering of genetically related samples grown in Estonia, and hierarchical cluster analyses highlighted differences and similarities in their metabolic profiles driving separation between cultivars with specific metabolic phenotypes. Phenolic acids, flavonoids, flavan-3-ol derivatives, terpenes, and many types of glycosidically bound aroma and flavor precursors showed clear variation between strawberry cultivars...
November 2016: Food Research International
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