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Margret Thorsteinsdottir, Unnur A Thorsteinsdottir, Finnur F Eiriksson, Hrafnhildur L Runolfsdottir, Inger M Sch Agustsdottir, Steinunn Oddsdottir, Baldur B Sigurdsson, Hordur K Hardarson, Nilesh R Kamble, Snorri Th Sigurdsson, Vidar O Edvardsson, Runolfur Palsson
Adenine phosphoribosyltransferase (APRT) deficiency is a hereditary disorder that leads to excessive urinary excretion of 2,8-dihydroxyadenine (DHA), causing nephrolithiasis and chronic kidney disease. Treatment with allopurinol or febuxostat reduces DHA production and attenuates the renal manifestations. Assessment of DHA crystalluria by urine microscopy is used for therapeutic monitoring, but lacks sensitivity. We report a high-throughput assay based on ultra-performance liquid chromatography coupled to tandem mass spectrometry (UPLC-MS/MS) for quantification of urinary DHA...
September 14, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Alexandra E Neal, Paul A Moore
Animals living in aquatic habitats regularly encounter anthropogenic chemical pollution. Typically, the toxicity of a chemical toxicant is determined by the median lethal concentration (LC50) through a static exposure test. However, LC50 values and static tests do not provide an accurate representation of exposure to pollutants within natural stream systems. In their native habitats, animals experience exposure as a fluctuating concentration due to turbulent mixing, temporal variations of contamination (seasonal inputs), and contaminant input type (point vs...
October 19, 2016: Ecotoxicology and Environmental Safety
Wai Jia Tam, Philip Yap
Approximately two-thirds of the world's older adults live in developing nations. By 2050, as many as 80% of such older people will live in low- and middle-income countries. In sub-Saharan Africa alone, the number of individuals aged 60 and older is projected to reach 163 million. Despite this demographic wave, the majority of Africa has limited access to qualified geriatric health care.(3) Although foreign aid and capacity-building efforts can help to close this gap over time, it is likely that failure to understand the unique context of Africa's older adults, many of whom are marginalized, will lead to inadequacies in service delivery and poor health outcomes...
October 22, 2016: Journal of the American Geriatrics Society
Mauricio J Grisolia, Diego A Peralta, Hugo A Valdez, Julieta Barchiesi, Diego F Gomez-Casati, María V Busi
Starch binding domains of starch synthase III from Arabidopsis thaliana (SBD123) binds preferentially to cell wall polysaccharides rather than to starch in vitro. Transgenic plants overexpressing SBD123 in the cell wall are larger than wild type. Cell wall components are altered in transgenic plants. Transgenic plants are more susceptible to digestion than wild type and present higher released glucose content. Our results suggest that the transgenic plants have an advantage for the production of bioethanol in terms of saccharification of essential substrates...
October 21, 2016: Plant Molecular Biology
Melis Kant, Merve Akış, Mehmet Çalan, Tuğba Arkan, Fırat Bayraktar, Miral Dizdaroglu, Hüray İşlekel
Prediabetes is the preclinical stage of type 2 diabetes mellitus (T2DM) with intermediate state of hyperglycemia. Hyperglycemia results in a state of oxidative stress, which may contribute to the production of insulin resistance, β-cell dysfunction and long-term complications of diabetes. Novel approaches are required for prevention and treatment of diabetes. New biomarkers that can be used in risk stratification and therapy control as supplementary to current parameters are needed. These biomarkers may facilitate a more individualized and sufficient treatment of diabetes...
September 26, 2016: DNA Repair
Tianyang Guo, Pingping Fang, Juanjuan Jiang, Feng Zhang, Wei Yong, Jiahui Liu, Yiyang Dong
A rapid method to screen and quantify multi-class analytic targets in red wine has been developed by direct analysis in real time (DART) coupled with triple quadruple tandem mass spectrometry (QqQ-MS). A modified QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) procedure was used for increasing analytical speed and reducing matrix effect, and the multiple reaction monitoring (MRM) in DART-MS/MS ensured accurate analysis. One bottle of wine containing 50 pesticides and 12 adulterants, i.e., preservatives, antioxidant, sweeteners, and azo dyes, could be totally determined less than 12min...
October 1, 2016: Journal of Chromatography. A
Ji Ye Lee, Na Hyun Park, Wonwoong Lee, Eun Hye Kim, Young Ho Jin, Eun Kyung Seo, Jongki Hong
A comprehensive profiling method was established for the determination of various chemicals in Pinellia (P.) ternata and pedatisecta species. The profiling method comprises a fast ultrasonic extraction with various solvents, followed by GC-MS and LC-APCI-MS analysis. A total of 73 polar components as trimethylsilyl (TMS) derivatives were detected in methanol extract by GC-MS. The main components of the P. species were profiled as several kinds of fatty acids, amino acids, nucleic acids, carbohydrates, and phenolic compounds...
October 13, 2016: Journal of Chromatography. A
Alex Virgilio, Daniela Schiavo, Letícia M Costa, Joaquim A Nóbrega, Bradley T Jones, George L Donati
This work describes a procedure using the recently proposed standard dilution analysis (SDA) calibration method for the determination of As, Cr and Ni in concentrated HNO3 and HCl by inductively coupled plasma tandem mass spectrometry (ICP-MS/MS). Because of the low contaminant levels, and consequently low limits of detection required for these reagents (commonly used in trace element analysis and the semiconductor industry), samples were minimally diluted. The analysis of concentrated acids can result in matrix/transport effects, which may compromise accuracy in ICP-MS determinations...
December 1, 2016: Talanta
Ilaria Degano, Jacopo La Nasa, Elisa Ghelardi, Francesca Modugno, Maria Perla Colombini
Lipid binders have traditionally been determined in paintings by using gas chromatography/mass spectrometry (GC/MS) to identify the characteristic profiles and ratios of fatty acids . However, the presence of mixtures in contemporary and modern oil paints makes the GC/MS determination of fatty acids insufficient to fully characterize the lipid binding media. In this study we prove that triacylglycerol (TAG) profiling by high-performance liquid chromatography with high-resolution tandem mass spectrometry, using ESI in positive and negative ionization modes is highly effective...
December 1, 2016: Talanta
Shima N N S Hashim, Lachlan J Schwarz, Basil Danylec, Mahesh K Potdar, Reinhard I Boysen, Milton T W Hearn
This investigation describes a general procedure for the selectivity mapping of molecularly imprinted polymers, using (E)-resveratrol-imprinted polymers as the exemplar, and polyphenolic compounds present in Pinot noir grape skin extracts as the test compounds. The procedure is based on the analysis of samples generated before and after solid-phase extraction of (E)-resveratrol and other polyphenols contained within the Pinot noir grape skins using (E)-resveratrol-imprinted polymers. Capillary reversed-phase high-performance liquid chromatography (RP-HPLC) and electrospray ionisation tandem mass spectrometry (ESI MS/MS) was then employed for compound analysis and identification...
December 1, 2016: Talanta
Gabrieli Bernardi, Magali Kemmerich, Lucila C Ribeiro, Martha B Adaime, Renato Zanella, Osmar D Prestes
An effective method has been developed and validated for the determination of residues of 55 pesticides in tobacco. The proposed sample preparation method is based on acetonitrile extraction, low-temperature precipitation (LTP) and dispersive solid phase extraction (d-SPE) clean-up. Gas chromatography and ultra-high performance liquid chromatography analysis, both coupled to tandem mass spectrometry (GC-MS/MS and UHPLC-MS/MS), were used for determination. LTP is easy to perform and was crucial to obtain a clean extract...
December 1, 2016: Talanta
Per J R Sjöberg, Pernilla Thelin, Emil Rydin
A method for isomeric separation of inositol phosphates (InsPn) in environmental samples originating from different sources such as soil, manure/compost, and aquatic sediments has been developed. The method includes a single NaOH-EDTA extraction step, centrifugation and direct injection of a particle free solution into an ion chromatographic column. Isomeric liquid chromatographic separation was achieved with an ammonium carbonate gradient compatible with electrospray ionization tandem mass spectrometric detection (LC-ESI-MS/MS)...
December 1, 2016: Talanta
Man Wang, Ping Ma, Xiaonan Xi, Lei Liu, Yabin Wen, Kangning Liu, Liang Sun, Yaxin Lu, Zheng Yin
The bioanalysis and especially the sample preparation of nucleoside drugs in complex media, such as human plasma, has been challenging due to the high polarity and high solubility of these drugs in water. Online solid phase extraction (SPE) offers significant advantages, such as automation and timesaving. Thus, several types of SPE columns have been developed for compounds with different polarities. In this study, SPE was applied to overcome the issue of sample pretreatment of nucleoside drugs in human plasma, with the final aim of establishing a robust analytical platform for drugs with similar structures...
December 1, 2016: Talanta
Na Wei, Xian-En Zhao, Shuyun Zhu, Yongrui He, Longfang Zheng, Guang Chen, Jinmao You, Shu Liu, Zhiqiang Liu
This paper, for the first time, reported a simple, rapid, sensitive and environmental friendly ultrasonic-assisted in situ derivatization-dispersive liquid-liquid microextraction (in situ UAD-DLLME) method followed by ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) for the simultaneous determination of dopamine (DA), serotonin (5-HT) and their biosynthesis precursors and metabolites in rat brain microdialysates. In this work, a commercial reagent, Lissamine rhodamine B sulfonylchloride (LRSC), was proposed as a derivatization reagent...
December 1, 2016: Talanta
María Asunción López-Bascón, Mónica Calderón-Santiago, Feliciano Priego-Capote
A novel class of endogenous mammalian lipids endowed with antidiabetic and anti-inflammatory properties has been recently discovered. These are fatty acid esters of hydroxy fatty acids (FAHFAs) formed by condensation between a hydroxy fatty acid and a fatty acid. FAHFAs are present in human serum and tissues at low nanomolar concentrations. Therefore, high sensitivity and selectivity profiling analysis of these compounds in clinical samples is demanded. An automated qualitative and quantitative method based on on-line coupling between solid phase extraction and liquid chromatography-tandem mass spectrometry has been here developed for determination of FAHFAs in serum with the required sensitivity and selectivity...
November 2, 2016: Analytica Chimica Acta
Michał Książkiewicz, Sandra Rychel, Matthew N Nelson, Katarzyna Wyrwa, Barbara Naganowska, Bogdan Wolko
BACKGROUND: The Arabidopsis FLOWERING LOCUS T (FT) gene, a member of the phosphatidylethanolamine binding protein (PEBP) family, is a major controller of flowering in response to photoperiod, vernalization and light quality. In legumes, FT evolved into three, functionally diversified clades, FTa, FTb and FTc. A milestone achievement in narrow-leafed lupin (Lupinus angustifolius L.) domestication was the loss of vernalization responsiveness at the Ku locus. Recently, one of two existing L...
October 21, 2016: BMC Genomics
Xiang-Xin Huang, Yun-Xuan Li, Xiang-Yu Li, Xiao-Xia Hu, Peng-Fei Tang, Guo-Xin Hu
Currently, crizotinib is the first generation drug, which has been used in the treatment of ALK-rearranged non-small cell lung cancer (NSCLC). However, more and more patients are found in crizotinib-resistance. In the last year, alectinib has been approved for treatment of patients with crizotinib-resistance. In this study, we aim to develop and validate a simple, rapid and sensitive tandem mass spectrometry (UHPLC-MS/MS) method for determination of alectinib in rat plasma. Diazepam was chosen as an internal standard (IS)...
October 14, 2016: Journal of Pharmaceutical and Biomedical Analysis
Donatella Nardiello, Clelia Prattichizzo, Maria Teresa Rocchetti, Loreto Gesualdo, Diego Centonze
A dedicated proteomic approach based on nano-Liquid Chromatography coupled with tandem mass spectrometry in ion trap is proposed for the analysis of proteins trapped in sorbent resin cartridges used to remove inflammatory mediators from blood by coupled plasma filtration adsorption (CPFA). The final purpose of the proposed proteomic approach was to obtain a reference map of plasma proteins trapped in CPFA sorbents used for the extracorporeal blood purification of healthy pigs, with the potential impact to design new bio-filters able to control the inflammatory imbalance under pathological conditions, such as severe sepsis...
October 12, 2016: Journal of Pharmaceutical and Biomedical Analysis
Roshini Fernando, Ekaterina Placzek, Edmund A Reese, Andrew T Placzek, Samantha Schwartz, Aaron Trierweiler, Leslie M Niziol, Stephen Atkins, Thomas S Scanlan, Terry J Smith
CONTEXT: The sources and biological impact of 3,3',5,5' tetraiodothyroacetic acid (TA4) are uncertain. CD34(+) fibrocytes express several proteins involved in the production of thyroid hormones. They infiltrate the orbit in Graves' disease (GD), an autoimmune process known as thyroid-associated ophthalmopathy. It appears that the thyrotropin receptor (TSHR) plays an important role in the pathogenesis of TAO. OBJECTIVE: To quantify levels of TA4 in healthy subjects and those with Graves' disease...
October 21, 2016: Journal of Clinical Endocrinology and Metabolism
Marie-Catherine Drigeard Desgarnier, Corinne Zinflou, Justin D Mallet, Sébastien P Gendron, Sébastien J Méthot, Patrick J Rochette
Purpose: Human chromosomes are protected at their end by a long portion of hexameric tandem repeats, the telomere. In somatic cells, telomere attrition caused by endogenous and exogenous oxidative stress as well as DNA replication can threaten genomic integrity and lead to the deterioration of tissue functions and an age-related physiological decline. The human eye is a complex organ in which cells of different ocular tissues are exposed to photo-oxidation, high mitochondrial metabolic activity, and/or replicative pressure...
October 1, 2016: Investigative Ophthalmology & Visual Science
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