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Barwick Vicki Ellison Stephen L. R. Gjengedal Elin Magnusson Bertil Molinier Olivier Patriarca Marina Sibbesen Lorens Vanlaethem Nicole Vercruysse Isabelle 《Accreditation and quality assurance》2017,22(5):253-263
Accreditation and Quality Assurance - Eurachem held a workshop on method validation in analytical sciences in Gent, Belgium, on 9–10 May 2016. A summary of the working group discussions is... 相似文献
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Johnsen E Wilson SR Odsbu I Krapp A Malerod H Skarstad K Lundanes E 《Journal of chromatography. A》2011,1218(35):5981-5986
Eight deoxynucleoside triphosphates (dNTPs) and nucleoside triphosphates (NTPs): ATP, CTP, GTP, UTP, dATP, dCTP, dGTP and dTTP, were separated with two 15 cm ZIC-pHILIC columns coupled in series, using LC-UV instrumentation. The polymer-based ZIC-pHILIC column gave significantly better separations and peak shape than a silica-based ZIC-HILIC column. Better separations were obtained with isocratic elution as compared to gradient elution. The temperature markedly affected the selectivity and could be used to fine tune separation. The analysis time was also affected by temperature, as lower temperatures surprisingly reduced the retention of the nucleotides. dNTP/NTP standards could be separated in 35 min with a flow rate of 200 μL/min. In Escherichia coli cell culture samples dNTP/NTPs could be selectively separated in 7 0min using a flow rate of 100 μL/min. 相似文献
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Kütt A Rodima T Saame J Raamat E Mäemets V Kaljurand I Koppel IA Garlyauskayte RY Yagupolskii YL Yagupolskii LM Bernhardt E Willner H Leito I 《The Journal of organic chemistry》2011,76(2):391-395
In this paper, we report the most comprehensive equilibrium superacidity scale that is available to date. Contrary to most of the past works, this scale is set up in a medium of constant composition and the obtained acidity values characterize the acidities of molecules rather than acidities of media. The current scale is thus complementary to the well-known H(0) scale in the information that it provides. The solvent used is 1,2-dichloroethane (DCE). DCE has very weak basic properties (but sufficiently high polarity) and is an appropriate solvent for measuring acidities of very strong acids of diverse chemical nature. DCE acidities of well-known superacids (CF(3)SO(2)OH, (CF(3)SO(2))(2)NH, cyanocarbon acids, etc.) as well as common mineral acids (H(2)SO(4), HI, HBr, etc.) are reported. Acidities of altogether 62 acids have been determined from 176 interlinked relative acidity measurements. The scale spans 15 orders of magnitude (from picric acid to 1,1,2,3,3-pentacyanopropene) and is expected to be a useful tool in design, use, and further acidity measurements of superacidic molecules. 相似文献
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Buell AK Esbjörner EK Riss PJ White DA Aigbirhio FI Toth G Welland ME Dobson CM Knowles TP 《Physical chemistry chemical physics : PCCP》2011,13(45):20044-20052
Much effort has focussed in recent years on probing the interactions of small molecules with amyloid fibrils and other protein aggregates. Understanding and control of such interactions are important for the development of diagnostic and therapeutic strategies in situations where protein aggregation is associated with disease. In this perspective article we give an overview over the toolbox of biophysical methods for the study of such amyloid-small molecule interactions. We discuss in detail two recently developed techniques within this framework: linear dichroism, a promising extension of the more traditional spectroscopic techniques, and biosensing methods, where surface-bound amyloid fibrils are exposed to solutions of small molecules. Both techniques rely on the measurement of physical properties that are very directly linked to the binding of small molecules to amyloid aggregates and therefore provide an attractive route to probe these important interactions. 相似文献
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Garanin S. G. Dushina L. A. Elin I. P. Zhidkov N. V. Izgorodin V. M. Kalmykov N. A. Kovalenko V. P. Kravchenko A. G. Litvin D. N. Petrov S. I. Pozdnyakov E. V. Rogachev V. G. Starodubtsev K. V. Suslov N. A. Tachaev G. V. Chaunin A. E. 《Journal of Experimental and Theoretical Physics》2019,128(4):650-654
Journal of Experimental and Theoretical Physics - We report on the results of experiments performed on the Iskra-5 laser facility for studying the effect of the polydeuteroethylene (CD2)n working... 相似文献