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https://www.readbyqxmd.com/read/27933499/assessment-of-molecularly-imprinted-polymers-mips-in-the-preconcentration-of-disperse-red-73-dye-prior-to-photoelectrocatalytic-treatment
#1
Jefferson Honorio Franco, Alejandra Ben Aissa, Guilherme Garcia Bessegato, Laura Martinez Fajardo, Maria Valnice Boldrin Zanoni, María Isabel Pividori, Maria Del Pilar Taboada Sotomayor
Magnetic molecularly imprinted polymers (MMIPs) have become a research hotspot due to their two important characteristics: target recognition and magnetic separation. This paper presents the preparation, characterization, and optimization of an MMIP for the preconcentration of disperse red 73 dye (DR73) and its subsequent efficient degradation by photoelectrocatalytic treatment. The MMIPs were characterized by scanning electron microscopy (SEM), which revealed homogeneous distribution of the particles. Excellent encapsulation of magnetite was confirmed by transmission electron microscopy (TEM)...
December 8, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27933483/covalent-immobilization-of-human-placental-17%C3%AE-hydroxysteroid-dehydrogenase-type-1-onto-glutaraldehyde-activated-silica-coupled-with-lc-tof-ms-for-anti-cancer-drug-screening-applications
#2
Yin Bai, Wen-Di Zhou, Xian-Min Mu, Qian Zhang, Chen Yu, Bin Di, Meng-Xiang Su
Human 17β-hydroxysteroid dehydrogenase type 1 (17β-HSD1), a potential target in breast cancer prevention and therapy, was extracted from human placenta and immobilized on nonporous silica (∼5 μm) with a covalent method for the first time. The optimum initial enzyme concentration and immobilization time during the immobilization process were 0.42 mg mL(-1) and 12 h, repectively. The binding was confirmed by scanning electron microscope (SEM) and infrared spectroscopy (FT-IR). It could improve the pH, thermal and storage stability compared to free enzyme...
December 8, 2016: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/27933361/biotransformation-and-detectability-of-the-new-psychoactive-substances-n-n-diallyltryptamine-dalt-derivatives-5-fluoro-dalt-7-methyl-dalt-and-5-6-methylenedioxy-dalt-in-urine-using-gc-ms-lc-ms-n-and-lc-hr-ms-ms
#3
Julian A Michely, Simon D Brandt, Markus R Meyer, Hans H Maurer
Derivatives of N,N-diallyltryptamine (DALT) can be classified as new psychoactive substances. Biotransformation and detectability of 5-fluoro-DALT (5-F-DALT), 7-methyl-DALT (7-Me-DALT), and 5,6-methylenedioxy-DALT (5,6-MD-DALT) are described here. Their metabolites detected in rat urine and pooled human liver microsomes were identified by liquid chromatography (LC)-high resolution (HR)-tandem mass spectrometry (MS/MS). In addition, the human cytochrome-P450 (CYP) isoenzymes involved in the main metabolic steps were identified and detectability tested in urine by the authors' urine screening approaches using GC-MS, LC-MS(n), or LC-HR-MS/MS...
December 8, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27933318/global-analysis-and-comparison-of-the-transcriptomes-and-proteomes-of-group-a-streptococcus-biofilms
#4
Jeffrey A Freiberg, Yoann Le Breton, Bao Q Tran, Alison J Scott, Janette M Harro, Robert K Ernst, Young Ah Goo, Emmanuel F Mongodin, David R Goodlett, Kevin S McIver, Mark E Shirtliff
To gain a better understanding of the genes and proteins involved in group A Streptococcus (GAS; Streptococcus pyogenes) biofilm growth, we analyzed the transcriptome, cellular proteome, and cell wall proteome from biofilms at different stages and compared them to those of plankton-stage GAS. Using high-throughput RNA sequencing (RNA-seq) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) shotgun proteomics, we found distinct expression profiles in the transcriptome and proteome. A total of 46 genes and 41 proteins showed expression across the majority of biofilm time points that was consistently higher or consistently lower than that seen across the majority of planktonic time points...
November 2016: MSystems
https://www.readbyqxmd.com/read/27932613/type-1-reaction-in-leprosy-patients-corresponds-with-a-decrease-in-pro-resolving-and-an-increase-in-pro-inflammatory-lipid-mediators
#5
Carlos A M Silva, Kristofor Webb, Barbara G Andre, Maria Angela de Mello Marques, Fernanda Marques de Carvalho, Cristiana Santos de Macedo, Roberta Olmo Pinheiro, Euzenir Nunes Sarno, Maria Cristina Vidal Pessolani, John T Belisle
BACKGROUND: Type 1 reaction (T1R) is an acute Th1 inflammatory episode in leprosy patients. While immunological responses associated with T1R have been investigated, the corresponding metabolic responses that could contribute to T1R pathology have received little attention. METHODS: Metabolomics-based analyses of sera from T1R (n=7) and T1R-free (n=9) patients were conducted via liquid chromatography-mass spectrometry (LC-MS). Serum metabolites that significantly differed (p<0...
December 8, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27932283/development-and-validation-of-a-liquid-chromatography-tandem-mass-spectrometry-assay-for-the-measurement-of-faecal-metronidazole
#6
Jinny Jeffery, Zoe J Vincent, Ruth M Ayling, Stephen J Lewis
BACKGROUND: Metronidazole is an oral antibiotic which is widely used in the treatment of patients with Clostridium difficile associated disease. METHODS: This article describes the validation of a LC-MS/MS assay for the measurement of metronidazole in human faecal samples. RESULTS: Matrix matched and aqueous standards showed no significant difference in performance for the routine calibration of the assay. D(4) deuterated metronidazole internal standard eluted with a different retention time to the undeuterated metronidazole on chromatography, hence zidovudine was used as an internal standard...
December 5, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27932276/the-why-and-how-of-amino-acid-analytics-in-cancer-diagnostics-and-therapy
#7
REVIEW
Friederike Manig, Konstantin Kuhne, Cläre von Neubeck, Uwe Schwarzenbolz, Zhanru Yu, Benedikt M Kessler, Jens Pietzsch, Leoni A Kunz-Schughart
Pathological alterations in cell functions are frequently accompanied by metabolic reprogramming including modifications in amino acid metabolism. Amino acid detection is thus integral to the diagnosis of many hereditary metabolic diseases. The development of malignant diseases as metabolic disorders comes along with a complex dysregulation of genetic and epigenetic factors affecting metabolic enzymes. Cancer cells might transiently or permanently become auxotrophic for non-essential or semi-essential amino acids such as asparagine or arginine...
December 5, 2016: Journal of Biotechnology
https://www.readbyqxmd.com/read/27931177/cholinesterase-inhibitory-anti-amyloidogenic-and-neuroprotective-effect-of-the-medicinal-plant-grewia-tiliaefolia-an-in-vitro-and-in-silico-study
#8
Dicson Sheeja Malar, Rajamohamed Beema Shafreen, Shunmugiah Karutha Pandian, Kasi Pandima Devi
CONTEXT: Grewia tiliaefolia Vahl. (Tiliaceae) is a sub-tropical plant used as an indigenous medicine in India. However, its efficacy has not been evaluated against Alzheimer's disease. OBJECTIVES: The objective of this study is to evaluate cholinesterase inhibitory, anti-aggregation and neuroprotective activity of G. tiliaefolia. MATERIALS AND METHOD: Grewia tiliaefolia leaves were collected from Eastern Ghats region, India, and subjected to successive extraction (petroleum ether, chloroform, ethyl acetate, methanol and water)...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/27931101/fate-of-fusarium-toxins-during-brewing
#9
Katharina Habler, Cajetan Geissinger, Katharina Hofer, Jan Schüler, Sarah Moghari, Michael Hess, Martina Gastl, Michael Rychlik
Some information are available about the fate of Fusarium toxins during the brewing process, but only little is known about the single processing steps in detail. In our study we produced beer from two different barley cultivars inoculated with three different Fusarium species, namely Fusarium culmorum, Fusarium sporotrichioides, and Fusarium avenaceum, producing a wide range of mycotoxins such as type B trichothecenes, type A trichothecenes, and enniatins. By the use of multi-mycotoxin LC-MS/MS stable isotope dilution methods we were able to follow the fate of Fusarium toxins during the entire brewing process...
December 9, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27931003/multivalent-calix-4-arene-based-fluorescent-sensor-for-detecting-silver-ions-in-aqueous-media-and-physiological-environment
#10
Behzad Lotfi, Aliakbar Tarlani, Peyman Akbari-Moghaddam, Maryam Mirza-Aghayan, Ali Ahmadi Peyghan, Jacques Muzart, Reza Zadmard
A new derivative of dipodal 1,3-calix[4]arene-based chemosensor (R), which was containing several binding sites have been synthesized and characterized by NMR, IR and LC-MS spectroscopic methods. The selectivity of Rhas been investigated in aqueous methanol, resulting in fluorescence shift and selective recognition of Ag(+) among 20 various alkali, alkaline earth and transition metal ions. Microstructural features of R and its complex with Ag(+)have been investigated by Atomic Force Microscopy (AFM). AFM images can clearly differentiate R from its complex of Ag(+)...
December 1, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27930840/evidence-of-gushing-induction-by-penicillium-oxalicum-proteins
#11
Elisabeth I Vogt, Veronika M Kupfer, Rudi F Vogel, Ludwig Niessen
AIMS: The aim of this study was to elucidate whether grape-associated fungi exert an influence on gushing by their production of surface-active compounds. METHODS AND RESULTS: In preliminary experiments 58 grape-associated isolates of species within Penicillium and Aspergillus genera were tested for their ability to modify the surface activity of culture supernatants. As the genus Penicillium had a higher potential to change surface activity, further research focused on that genus...
December 8, 2016: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/27930671/reaction-pathways-in-catechol-primary-amine-mixtures-a-window-on-crosslinking-chemistry
#12
Juan Yang, Vittorio Saggiomo, Aldrik H Velders, Martien A Cohen Stuart, Marleen Kamperman
Catechol chemistry is used as a crosslinking tool abundantly in both natural organisms (e.g. mussels, sandcastle worms) and synthetic systems to achieve the desired mechanical properties. Despite this abundance and success, the crosslinking chemistry is still poorly understood. In this study, to simplify the system, yet to capture the essential chemistry, model compounds 4-methyl catechol and propylamine are used. The reaction of 4-methyl catechol (2 mM) with propylamine (6 mM) is carried out in the presence of NaIO4 (2 mM) in 10 mM Na2CO3 aqueous solution...
2016: PloS One
https://www.readbyqxmd.com/read/27928978/oxidative-stress-in-major-depressive-and-anxiety-disorders-and-the-association-with-antidepressant-use-results-from-a-large-adult-cohort
#13
C N Black, M Bot, P G Scheffer, B W J H Penninx
BACKGROUND: Oxidative stress has been implicated in the pathophysiology of major depressive disorder (MDD) and anxiety disorders and may be influenced by antidepressant use. This study investigated the association of oxidative stress, measured by plasma levels of F2-isoprostanes and 8-hydroxy-2'-deoxyguanosine (8-OHdG) reflecting oxidative lipid and DNA damage respectively, with MDD, anxiety disorders and antidepressant use in a large cohort. METHOD: Data was derived from the Netherlands Study of Depression and Anxiety including patients with current (N = 1619) or remitted (N = 610) MDD and/or anxiety disorder(s) (of which N = 704 antidepressant users) and 612 controls...
December 8, 2016: Psychological Medicine
https://www.readbyqxmd.com/read/27928798/-a-chinese-multi-center-study-on-the-significance-of-monitoring-imatinib-plasma-concentration-in-patients-with-gastrointestinal-stromal-tumor-before-and-after-administration
#14
Hao Xu, Lilin Ma, Wei Xu, Wenxian Guan, Baolin Wang, Guoli Li, Yongchang Miao, Leping Li, Huanqiu Chen, Jiren Yu, Yongqing Wang, Luning Sun, Li Yang, Diancai Zhang, Fengyuan Li, Xiaofei Zhi, Jiwei Wang, Jianghao Xu, Zekuan Xu
OBJECTIVE: To investigate the factors which may influence the imatinib plasma concentration in Chinese patients with gastrointestinal stromal tumor(GIST), and to illuminate the significance of monitoring imatinib plasma concentration in adjuvant therapy for patients with GIST. METHODS: A cross-sectional study with 60 GIST patients who accepted the imatinib therapy after surgery was conducted. They were respectively administrated in 10 domestic hospitals from December 2014 to April 2016, including The First Affiliated Hospital of Nanjing Medical University(n=28), The Affiliated Hospital of Nantong University(n=9), The Affiliated Hospital of Xuzhou Medical College(n=6), Nanjing Drum Tower Hospital(n=5), The Second Affiliated Hospital of Nanjing Medical University (n=2), Jingling Hospital (n=2), The Second People's Hospital of Lianyungang(n=2), Shandong Provincial Hospital(n=2), Jiangsu Province Tumor Hospital(n=2), and The First Affiliated Hospital of Zhejiang University(n=2)...
November 25, 2016: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/27928140/reaction-and-scavenging-mechanism-of-%C3%AE-carotene-and-zeaxanthin-with-reactive-oxygen-species
#15
Azusa Nishino, Hiroyuki Yasui, Takashi Maoka
In order to investigate chemical scavenging mechanism of singlet oxygen, superoxide anion radical, and hydroxyl radical by carotenoids, reaction products obtained by reacting β-carotene or zeaxanthin with singlet oxygen, superoxide anion radical, and hydroxyl radical were analyzed by LC/PDA ESI-MS, and ESR spectrometry. β-Carotene endoperoxides were identified as the major reaction products of β-carotene and singlet oxygen, while β-carotene epoxides were the major reaction products of β-carotene and superoxide anion or hydroxyl radical...
December 8, 2016: Journal of Oleo Science
https://www.readbyqxmd.com/read/27925497/anti-inflammatory-and-anticancer-effects-of-flavonol-glycosides-from-diplotaxis-harra-through-gsk3%C3%AE-regulation-in-intestinal-cells
#16
Imen Nasri, Rachid Chawech, Cynthia Girardi, Emmanuel Mas, Audrey Ferrand, Nathalie Vergnolle, Nicolas Fabre, Raoudha Mezghani-Jarraya, Claire Racaud-Sultan
CONTEXT AND OBJECTIVE: Diplotaxis harra (Forssk.) Boiss. (Brassicaceae) is traditionally used as an antidiabetic, anti-inflammatory or anticancer agent. In these pathologies, the glycogen synthase kinase 3 β (GSK3β) is overactivated and represents an interesting therapeutic target. Several flavonoids can inhibit GSK3β and the purpose of this study was to search for the compounds in Diplotaxis harra which are able to modulate GSK3β. MATERIALS AND METHODS: Methanol extracts from D...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/27925471/lc-ms-ms-and-gc-ms-analyses-of-biologically-active-extracts-and-fractions-from-tunisian-juniperus-phoenice-leaves
#17
Henda Keskes, Sahla Belhadj, Lobna Jlail, Abdelfattah El Feki, Mohamed Damak, Sami Sayadi, Noureddine Allouche
CONTEXT: Despite some studies related to Juniperus phoenicea L. (Cupressaceae), phytochemical and biological investigations of this plant remain unexplored. OBJECTIVE: This work is the first report dealing with the identification and characterization of volatile components and flavonoids in hexane and methanol extracts from J. phoenicea leaves Materials and methods: Antioxidant activity of hexane, and methanol extracts from J. phoenicea leaves were determined by DPPH-radical scavenging assay...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/27925271/validation-of-an-lc-ms-ms-method-for-simultaneous-detection-of-four-hdac-inhibitors-belinostat-panobinostat-rocilinostat-and-vorinostat-in-mice-plasma-and-its-application-to-a-mice-pharmacokinetic-study
#18
Kalpesh Kumar Giri, Suresh P S, Syed Mohd Saim, Mohd Zainuddin, Ravi Kanth Bhamidipati, Purushottam Dewang, Mahanandeesha S Hallur, Sridharan Rajagopal, Sriram Rajagopal, Ramesh Mullangi
A sensitive and rapid LC-MS/MS method was developed and validated for the simultaneous quantitation of four HDAC inhibitors namely belinostat (BST), panobinostat (PST), rocilinostat (RST) and vorinostat (VST) in mice plasma as per regulatory guidelines. The analytes and internal standard were extracted from 50 μL mice plasma by protein precipitation, followed by chromatographic separation using an Atlantis C18 column with an isocratic mobile phase comprising 0.1% formic acid: acetonitrile (25:75,, v/v) at a flow rate of 0...
December 7, 2016: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/27925248/discovery-and-identification-of-potential-biomarkers-for-alcohol-induced-oxidative-stress-based-on-cellular-metabolomics
#19
Qingping Hu, Jianteng Wei, Yewei Liu, Xiulan Fei, Yuwei Hao, Dong Pei, Duolong Di
Biomarkers involved in alcohol-induced oxidative stress play an important role in alcoholic liver disease prevention and diagnosis. Alcohol-induced oxidative stress in human liver L-02 cells was used to discover the potential biomarkers. Metabolites from L-02 cells induced by alcohol were measured by high-performance liquid chromatography and mass spectrometry. Fourteen metabolites that allowed discrimination between control and model groups were discovered by multivariate statistical data analysis (i.e. principal components analysis, orthogonal partial least-squares discriminate analysis)...
December 7, 2016: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/27924714/biomonitoring-of-mycotoxins-in-urine-pilot-study-in-mill-workers
#20
Wolfram Föllmann, Nurshad Ali, Meinolf Blaszkewicz, Gisela H Degen
Contamination of grains with mycotoxins results in a dietary background exposure of the general population. In occupational settings such as during processing of raw materials as in milling, an additional mycotoxin exposure by inhalation is possible. Biomonitoring is an integrative approach to assess human exposure from various sources and by all routes. To investigate possible workplace exposure to mycotoxins, a pilot study was conducted that compared levels of urinary biomarkers in mill workers to those in a control group with dietary mycotoxin intake alone...
2016: Journal of Toxicology and Environmental Health. Part A
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