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Chemistry

Analytical chemistry

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Displaying 301 - 325 of 2084

Applying Planar, Patterned, Multimetallic Samples to Assess the Impact of Analysis Area in Surface-Chemical Analysis: results of a VAMAS Interlaboratory Comparison

February 3, 2020
Author(s)
Christina Passiu, WES Unger, P Rupper, L Gregoratti, M Amanti, P Zeller, C Malitesta, S Rella, SJ Spencer, A Shard, A Kim, Shinichiro N. Muramoto, M Engelhard, B Hagenhoff, B Bock, R Heuberger, P Dietrich, A Thissen, M Kjaervik, D Paul, J Newman, T Weimann, S Butefisch, ND Spencer, A Rossi
The lateral resolution of a surface-analysis instrument is commonly measured as one of the indicators of the quality of obtainable analytical results. Different methods exist to measure this quantity, and traditionally the employed method/reference sample

Quantifying protein aggregation kinetics using electrospray differential mobility analysis

January 5, 2020
Author(s)
Kaleb J. Duelge, Jeremie Parot, Vincent A. Hackley, Michael R. Zachariah
Protein aggregation is a significant concern in bioprocessing and end use applications. Here the thermal aggregation kinetics of bovine serum albumin (BSA) and α-chymotrypsinogen A (α- chymo) were measured over a range of concentrations and temperatures by

Development of an LC-APCI-MS Method for Determining Off-Flavor Compounds and its Application Towards Marine Recirculating Aquaculture System Monitoring and Evaluation of Aeration as a Depuration Approach

January 4, 2020
Author(s)
Mary Bedner, Keiko Saito
The off-flavor compounds geosmin and 2-methylisoborneol (2-MIB) are well-known to impact the quality of farmed freshwater fish species, but little is known about off-flavors in marine aquaculture. To begin addressing this knowledge gap, a method for the

Blubber steroid hormone profiles as indicators of physiological state in free-ranging common bottlenose dolphins (Tursiops truncatus)

December 31, 2019
Author(s)
Thomas M. Galligan, Ashley Boggs, Brian C. Balmer, Teresa Rowles, Cynthia Smith, Forrest Townsend, Randall Wells, Nicholas Kellar, Eric Zolman, Lori Schwacke
Assessing endocrine health in free-ranging marine mammals can be difficult due to limited access to blood samples, which is the most commonly used sample matrix for endocrine assessment in wildlife. Blubber contains steroid hormones and can be collected

The role of ICP-MS in Separation Science

December 17, 2019
Author(s)
Antonio R. Montoro Bustos
Since its introduction in the 1980s, inductively coupled plasma mass spectrometry (ICP-MS) has evolved to become arguably the most versatile and powerful technique for the elemental analysis of metals, metalloids and selected non-metals at (ultra-)trace

Application of INAA methods for KRISS infant forumla CRM analysis: Standardization of INAA at KRISS

November 15, 2019
Author(s)
Hana Cho, Kishore B. Dasari, Radojko Ja?imovi?, Rolf L. Zeisler, Nicholas Sharp, Sun-Ha Kim, Gwang Min Sun, Yong-Hyeon Yim
We have established an instrumental neutron activation analysis (INAA) method, including k0- based INAA, at the Korea Research Institute of Standards and Science (KRISS) for the certification of reference materials. As part of establishing INAA

Metabolomics Test Materials for Quality Control: A Study of a Urine Materials Suite

November 7, 2019
Author(s)
Dan Bearden, David A. Sheen, Yamil Simon, Bruce A. Benner Jr., Werickson Fortunato de Carvalho Rocha, Niksa Blonder, Katrice A. Lippa, Richard Beger, Laura Schnackenberg, Jinchun Sun, Khyati Mehta, Amrita Cheema, Haiwei Gu, Ramesh Marupaka, Nagana Gowda, Daniel Raftery
There is a lack of experimental reference materials and standards for metabolomics measurements, such as urine, plasma, and other human fluid samples. Reasons include difficulties with supply, distribution, and dissemination of information about the

Contactless Resonant Cavity Dielectric Spectroscopic Studies of Recycled Office Papers

November 5, 2019
Author(s)
Mary Kombolias, Jan Obrzut, Michael T. Postek, Dianne L. Poster, Yaw S. Obeng
Current product composition and quality test methods for the paper and pulp industry are rooted in wet-bench chemistry techniques which are highly subjective. These techniques have rather limited utility and cannot be used to distinguish between virgin and

Sensitive Method for the Confident Identification of Genetically Variant Peptides in Human Hair

October 31, 2019
Author(s)
Zheng Zhang, Meghan Burke, William E. Wallace, Yuxue Liang, Sergey L. Sheetlin, Yuri Mirokhin, Dmitrii Tchekhovskoi, Stephen Stein
Recent reports have demonstrated that genetically variant peptides (GVPs) derived from human hair shaft proteins can be used to differentiate individuals of different biogeographic origin (Parker, G.J.; et al. PLos One. 2016, e0160653). We report a direct

An updated protocol based on CLSI document C37 for preparation of off-the-clot serum from individual units for use alone or to prepare commutable pooled serum reference materials

October 30, 2019
Author(s)
Johanna Camara, Uliana Danilenko, Hubert W. Vesper, Gary L. Myers, Patric A. Clapshaw, W. Greg Miller
Manufacturers of in-vitro diagnostic medical devices, clinical laboratories, research laboratories and calibration laboratories require commutable reference materials that can be used in the calibration hierarchies of medical laboratory measurement

Enhancing the Accuracy of Measurement of Small Molecule Organic Biomarkers

October 30, 2019
Author(s)
Tang Lin Teo, Katrice Lippa, Lindsey Mackay, Sharon Yong, Qinde Liu, Johanna Camara, Vincent Delatour, Tong Kooi Lee, Beatrice Lalere, Gavin O'Connor, Andr? Henrion, Megumi Kato, Jane L. Fernandes, Masahiko Numata, Ha-Jeong Kwon, Ji-Seon Jeong, Bei Xu, Jintana Nammoommoy, Dewei Song, Wagner Wollinger
Over two decades, the Organic Analysis Working Group (OAWG) of the Consultative Committee for Amount of Substance (CCQM) has organised a number of comparisons for clinically relevant small molecule organic biomarkers. These comparisons are hinged upon the

Live quantification of cell viability via neutral red uptake using lens-free imaging

October 27, 2019
Author(s)
Brian J. Nablo, Jungjoon Ahn, Kiran Bhadriraju, Jong M. Lee, Darwin Reyes-Hernandez
We present the quantification of cell viability during neutral red (NR) uptake with a compact lens-free system utilizing two light sources. Conventionally, the NR uptake assay determines cell viability based on the accumulation of NR within lysosomes and

Absolute quantification of RNA or DNA using acid hydrolysis and mass spectrometry

October 22, 2019
Author(s)
Mark S. Lowenthal, Eva Quittman, Karen W. Phinney
Accurate, traceable quantification of ribonucleotide or deoxyribonucleotide oligomers is achievable using acid hydrolysis and isotope dilution mass spectrometry (ID-MS). In this work, formic acid hydrolysis is demonstrated to generate stoichiometric
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