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https://www.readbyqxmd.com/read/29228469/simultaneous-determination-of-etonogestrel-and-ethinyl-estradiol-in-human-plasma-by-uplc-ms-ms-and-its-pharmacokinetic-study
#1
Sneha G Nair, Daxesh P Patel, Frank J Gonzalez, Bhargav M Patel, Puran Singhal, Darshan V Chaudhary
A selective, sensitive and rapid ultra-performance liquid chromatography tandem mass spectrometry method was developed and validated for the simultaneous determination of etonogestrel (ENG) and ethinyl estradiol (EE) in human plasma. The analytes and their deuterated internal standard, ENG-d7 and EE-d4 were extracted from plasma samples by solid phase extraction on HyperSep™ Retain PEP Cartridges. The chromatographic analysis was performed on ACQUITY UPLC HSS Cyano column, 100 A° (50 mm × 2.1 mm, 1.8 μm) column using gradient mobile phase, acetonitrile and 2...
December 11, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29228183/plasma-oxysterols-biomarkers-for-diagnosis-and-treatment-in-spastic-paraplegia-type-5
#2
Cecilia Marelli, Foudil Lamari, Dominique Rainteau, Alexandre Lafourcade, Guillaume Banneau, Lydie Humbert, Marie-Lorraine Monin, Elodie Petit, Rabab Debs, Giovanni Castelnovo, Elisabeth Ollagnon, Julie Lavie, Julie Pilliod, Isabelle Coupry, Patrick J Babin, Claire Guissart, Imen Benyounes, Urielle Ullmann, Gaetan Lesca, Christel Thauvin-Robinet, Pierre Labauge, Sylvie Odent, Claire Ewenczyk, Claude Wolf, Giovanni Stevanin, David Hajage, Alexandra Durr, Cyril Goizet, Fanny Mochel
The hereditary spastic paraplegias are an expanding and heterogeneous group of disorders characterized by spasticity in the lower limbs. Plasma biomarkers are needed to guide the genetic testing of spastic paraplegia. Spastic paraplegia type 5 (SPG5) is an autosomal recessive spastic paraplegia due to mutations in CYP7B1, which encodes a cytochrome P450 7α-hydroxylase implicated in cholesterol and bile acids metabolism. We developed a method based on ultra-performance liquid chromatography electrospray tandem mass spectrometry to validate two plasma 25-hydroxycholesterol (25-OHC) and 27-hydroxycholesterol (27-OHC) as diagnostic biomarkers in a cohort of 21 patients with SPG5...
December 8, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29228037/potential-serum-biomarkers-and-metabonomic-profiling-of-serum-in-ischemic-stroke-patients-using-uplc-q-tof-ms-ms
#3
Hongxue Sun, Jiaying Zhao, Di Zhong, Guozhong Li
BACKGROUND: Stroke still has a high incidence with a tremendous public health burden and it is a leading cause of mortality and disability. However, biomarkers for early diagnosis are absent and the metabolic alterations associated with ischemic stroke are not clearly understood. The objectives of this case-control study are to identify serum biomarkers and explore the metabolic alterations of ischemic stroke. METHODS: Metabonomic analysis was performed using ultra-performance liquid chromatography quadrupole time-of-flight tandem mass spectrometry and multivariate statistical analysis was employed to study 60 patients with or without ischemic stroke (30 cases and 30 controls)...
2017: PloS One
https://www.readbyqxmd.com/read/29227813/speed-matters-to-raise-molar-radioactivity-fast-hplc-shortens-the-quality-control-of-c-11-pet-tracers
#4
Lukas Nics, Britta Steiner, Eva-Maria Klebermass, Cecile Philippe, Markus Mitterhauser, Marcus Hacker, Wolfgang Wadsak
INTRODUCTION: The decision whether an in-house produced short-lived radiopharmaceutical can be applied in-vivo is based on (1) the fulfilment of all quality criteria; (2) the availability of enough radioactivity for subsequent imaging; and (3) a molar activity (MA) above the set limits to guarantee safe administration without competing occupancy of the non-radioactive compound; and (4) an activity concentration, which is high enough for the application in certain preclinical studies. Hence, time reduction can be of major importance to increase final product yields, MA and activity concentrations...
November 21, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/29227685/a-model-for-methylmercury-uptake-and-trophic-transfer-by-marine-plankton
#5
Amina Traore Schartup, Asif Qureshi, Clifton Dassuncao, Colin Pike Thackray, Gareth Harding, Elsie M Sunderland
Methylmercury (MeHg) concentrations can increase by up to 100,000 times between seawater and marine phytoplankton but levels vary across sites. To better understand how ecosystem properties affect variability in planktonic MeHg concentrations, we develop a model for MeHg uptake and trophic transfer at the base of marine food webs. The model successfully reproduces measured concentrations in phytoplankton and zooplankton across diverse sites from the Northwest Atlantic Ocean. Highest MeHg concentrations in phytoplankton are simulated under low dissolved organic carbon (DOC) and ultra-oligotrophic conditions typical of open ocean regions...
December 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29227495/fluorescence-activated-droplet-sorting-of-lipolytic-microorganisms-using-a-compact-optical-system
#6
Yuxin Qiao, Xiaoyan Zhao, Jun Zhu, Ran Tu, Libing Dong, Li Wang, Zhiyang Dong, Qinhong Wang, Wenbin Du
Lipases are ubiquitous enzymes of great physiological significance that have been used extensively in multiple industries. Environmental microorganisms are a major source for the discovery of novel lipases with high catalytic efficiency and selectivity. However, current plate-based screening of lipase-producing strains is time consuming, labour intensive and inefficient. In this study, we developed an ultra-high throughput screening pipeline for lipase-producing strains based on fluorescence-activated droplet sorting (FADS) using a compact optical system that could be easily set up in an alignment-free manner...
December 11, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/29227217/public-health-nutrition-special-issue-on-ultra-processed-foods
#7
Bridget Kelly, Enrique Jacoby
No abstract text is available yet for this article.
January 2018: Public Health Nutrition
https://www.readbyqxmd.com/read/29227021/rapid-characterization-of-the-absorbed-chemical-constituents-of-tangzhiqing-formula-following-oral-administration-using-uhplc-q-tof-ms
#8
Xiao-Lei Wu, Ming-Jiang Wu, Xin-Ze Chen, Hong-Min Zhang, Li-Qin Ding, Fu-Ying Tian, Xiao-Meng Fu, Feng Qiu, De-Qin Zhang
Tangzhiqing formula, a Chinese herbal formula, is used for the treatment of type II diabetes and pre-diabetes. Although its effectiveness has been certified by clinical use, its absorbed chemical constituents are not comprehensively represented. Thence, to reveal potential bioactive components and metabolism of Tangzhiqing formula, an ultra high performance liquid chromatography with quadrupole time-of-flight mass spectrometry method was developed. A total of 86 absorbed components, including 38 prototype compounds and 48 metabolites, were identified in rat plasma, urine and feces after oral administration of Tangzhiqing formula...
December 11, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29227006/major-improvement-in-the-detection-of-microsatellite-instability-in-colorectal-cancer-using-hsp110-t17-e-ice-cold-pcr
#9
Alexandre How-Kit, Antoine Daunay, Olivier Buhard, Clément Meiller, Mourad Sahbatou, Ada Collura, Alex Duval, Jean-François Deleuze
Every colorectal cancer (CRC) patient should be tested for microsatellite instability (MSI) to screen for Lynch syndrome. Evaluation of MSI status involves screening tumor DNA for the presence of somatic deletions in DNA repeats using PCR followed by fragment analysis. While this method may lack sensitivity due to the presence of a high level of germline DNA, which frequently contaminates the core of primary colon tumors, no other method developed to date is capable of modifying the standard PCR protocol to achieve improvement of MSI detection...
December 11, 2017: Human Mutation
https://www.readbyqxmd.com/read/29226868/predictors-of-age-of-diagnosis-and-survival-of-alzheimer-s-disease-in-down-syndrome
#10
Amanda Sinai, Claire Mokrysz, Jane Bernal, Ingrid Bohnen, Simon Bonell, Ken Courtenay, Karen Dodd, Dina Gazizova, Angela Hassiotis, Richard Hillier, Judith McBrien, Jane McCarthy, Kamalika Mukherji, Asim Naeem, Natalia Perez-Achiaga, Khadija Rantell, Vijaya Sharma, David Thomas, Zuzana Walker, Sarah Whitham, Andre Strydom
BACKGROUND: People with Down syndrome (DS) are an ultra-high risk population for Alzheimer's disease (AD). Understanding the factors associated with age of onset and survival in this population could highlight factors associated with modulation of the amyloid cascade. OBJECTIVE: This study aimed to establish the typical age at diagnosis and survival associated with AD in DS and the risk factors associated with these. METHODS: Data was obtained from the Aging with Down Syndrome and Intellectual Disabilities (ADSID) research database, consisting of data extracted from clinical records of patients seen by Community Intellectual Disability Services (CIDS) in England...
December 6, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29226668/specific-dopamine-sensing-based-on-short-term-plasticity-behavior-of-a-whole-organic-artificial-synapse
#11
Martina Giordani, Marcello Berto, Michele Di Lauro, Carlo Augusto Bortolotti, Michele Zoli, Fabio Biscarini
In this work, we demonstrate the ultra-sensitive and selec-tive detection of dopamine by means of a neuro-inspired device platform without the need of a specific recognition moiety. The sensor is a whole organic device featuring two electrodes made of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate - PEDOT:PSS - patterned on a polydymethylsiloxane - PDMS - flexible substrate. One electrode is pulsed with a train of voltage square waves, to mimic the pre-synaptic neuron behavior, while the other is used to record the displacement current, mimicking the post-synaptic neuron...
December 11, 2017: ACS Sensors
https://www.readbyqxmd.com/read/29226479/metabolite-profiling-and-isolation-of-biologically-active-compounds-from-scadoxus-puniceus-a-highly-traded-south-african-medicinal-plant
#12
Devashan Naidoo, Lenka Poštová Slavětínská, Adeyemi O Aremu, Jiri Gruz, Ondrej Biba, Karel Doležal, Johannes Van Staden, Jeffrey F Finnie
Scadoxus puniceus (Amaryllidaceae), a medicinal plant of high value in South Africa, is used as a component of a traditional herbal tonic prescribed to treat several ailments. Ultra-high performance liquid chromatography-tandem mass spectrometry quantified the phenolic compounds in different organs of S. puniceus. Gravity column chromatography was used to separate fractions and active compounds. The structure of these compounds was determined using 1D and 2D nuclear magnetic resonance and mass spectroscopic techniques...
December 11, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/29226353/biotransformation-and-metabolic-profile-of-xian-ling-gu-bao-capsule-a-traditional-chinese-medicine-prescription-with-rat-intestinal-microflora-by-ultra-performance-liquid-chromatography-coupled-with-quadrupole-time-of-flight-tandem-mass-spectrometry-analysis
#13
Meng-Xue Gao, Xi-Yang Tang, Feng-Xiang Zhang, Zhi-Hong Yao, Xin-Sheng Yao, Yi Dai
Xian-Ling-Gu-Bao capsule (XLGB), a well-known traditional Chinese medicine prescription (TCMP), has been used for prevention and treatment of osteoporosis. The safety and efficacy of XLGB have been confirmed based on the principle of evidence-based medicine (EBM). XLGB is usually administered orally, after which its multi-components are brought into contacted with intestinal microflora in the alimentary tract and biotransformed. However, investigations on the comprehensive metabolic profile of XLGB are absent...
December 11, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29226026/ultra-low-dispersity-poly-vinyl-alcohol-reveals-significant-dispersity-effects-on-ice-recrystallization-inhibition-activity
#14
Nicholas S Vail, Christopher Stubbs, Caroline I Biggs, Matthew I Gibson
Polymer mimics of antifreeze proteins are emerging as an exciting class of macromolecular cryoprotectants for the storage of donor cells and tissue. Poly(vinyl alcohol), PVA, is the most potent polymeric ice growth inhibitor known, but its mode of action and the impact of valency (DP) are not fully understood. Herein, tandem RAFT polymerization and column chromatography are used to isolate oligomers with dispersities <1.01 to enable the effect of molecular weight distribution, as well as length, to be probed...
August 30, 2017: ACS Macro Letters
https://www.readbyqxmd.com/read/29225663/high-throughput-detection-of-antioxidants-in-mulberry-fruit-using-correlations-between-high-resolution-mass-and-activity-profiles-of-chromatographic-fractions
#15
Ye Ji Park, Si Hyun Seong, Min Sun Kim, Sang Wan Seo, Mee Ree Kim, Hyun Sik Kim
Background: Plant extracts contain a huge variety of pharmacologically active substances. Conventionally, various chromatographic methods must be applied several times to purify functional compounds to measure their functional activity. However, conventional purification methods are time-consuming and expensive due to the laborious purification process. Recently, a high-throughput discovery method that replaces such time-consuming purification processes was introduced; this method uses 15 T ultra-high-resolution Fourier transform ion cyclotron resonance mass spectrometry (15 T FT-ICR MS) and a high-throughput screening method...
2017: Plant Methods
https://www.readbyqxmd.com/read/29225424/parametric-analysis-of-electromechanical-and-fatigue-performance-of-total-knee-replacement-bearing-with-embedded-piezoelectric-transducers
#16
Mohsen Safaei, R Michael Meneghini, Steven R Anton
Total knee arthroplasty (TKA) is a common procedure in the United States; it has been estimated that about 4 million people are currently living with primary knee replacement in this country. Despite huge improvements in material properties, implant design, and surgical techniques, some implants fail a few years after surgery. A lack of information about in vivo kinetics of the knee prevents the establishment of a correlated intra- and postoperative loading pattern in knee implants. In this study, a conceptual design of an ultra high molecular weight (UHMW) knee bearing with embedded piezoelectric transducers is proposed, which is able to measure the reaction forces from knee motion as well as harvest energy to power embedded electronics...
September 2017: Smart Materials & Structures
https://www.readbyqxmd.com/read/29225402/behavioral-assay-and-chemical-characters-of-female-sex-pheromones-in-the-hermit-crab-pagurus-filholi
#17
Saori Okamura, Takuma Kawaminami, Hiroshi Matsuura, Nobuhiro Fusetani, Seiji Goshima
Males of the hermit crab Pagurus filholi perform assessment behavior toward females, as a preliminary step of precopulatory guarding, during the reproductive season. It is known that such behavior is elicited by female sex pheromones, but the compounds involved have never been characterized in this species. Several experiments were conducted to develop a reliable bioassay along with purification procedures to identify potential compounds with pheromonal activity in Pagurus filholi. We developed a bioassay protocol to assess pheromonal activity by using an empty shell with cotton containing either artificial seawater (control) or test water...
2017: Journal of Ethology
https://www.readbyqxmd.com/read/29224339/immobilization-of-aluminum-hydroxide-particles-on-quartz-crystal-microbalance-sensors-to-elucidate-antigen-adjuvant-interaction-mechanisms-in-vaccines
#18
Jean-François Art, Aurélien Vander Straeten, Christine C Dupont-Gillain
Aluminum hydroxide (AH) salts are the most widely used adjuvants in vaccine formulation. They trigger immunogenicity from antigenic subunits that would otherwise suffer from a lack of efficiency. Previous studies focusing on antigen-AH interaction mechanisms, performed with model proteins, suggested that electrostatic interactions and phosphate-hydroxyl ligand exchanges drive protein adsorption on AH. We however recently evidenced that NaCl, used in vaccine formulation, provokes AH particle aggregation. This must be taken into account to interpret data related to protein adsorption on AH...
December 9, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29224138/quantification-of-global-dna-methylation-levels-by-mass-spectrometry
#19
Agustin F Fernandez, Luis Valledor, Fernando Vallejo, Maria Jesús Cañal, Mario F Fraga
Global DNA methylation was classically considered the relative percentage of 5-methylcysine (5mC) with respect to total cytosine (C). Early approaches were based on the use of high-performance separation technologies and UV detection. However, the recent development of protocols using mass spectrometry for the detection has increased sensibility and permitted the precise identification of peak compounds based on their molecular masses. This allows work to be conducted with much less genomic DNA starting material and also to quantify 5-hydroxymethyl-cytosine (5hmC), a recently identified form of methylated cytosine that could play an important role in active DNA demethylation...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29224073/cleantag-adapters-improve-small-rna-next-generation-sequencing-library-preparation-by-reducing-adapter-dimers
#20
Sabrina Shore, Jordana M Henderson, Anton P McCaffrey
Next-generation small RNA sequencing is a valuable tool which is increasing our knowledge regarding small noncoding RNAs and their function in regulating genetic information. Library preparation protocols for small RNA have thus far been restricted due to higher RNA input requirements (>10 ng), long workflows, and tedious manual gel purifications. Small RNA library preparation methods focus largely on the prevention or depletion of a side product known as adapter dimer that tends to dominate the reaction...
2018: Methods in Molecular Biology
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