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Optimization of Folch, Bligh-Dyer, and Matyash Sample-to-Extraction Solvent Ratios for Mammalian Cell- and Plasma-Based Lipidomics Studies

December 11, 2018

Author(s)

John Bowden, Candice Z. Ulmer, Christina Jones, Richard A. Yost, Timothy J. Garrett

In order to investigate changes in the lipidome, analysis by ultra-high performance liquid chromatography - high resolution mass spectrometry (UHPLC-HRMS) typically requires the extraction of lipid content from sample matrices using optimized, matrix

Evolution of Reference Materials for the Determination of Organic Nutrients in Food and Dietary Supplements - A Critical Review

December 1, 2018

Author(s)

Stephen Wise, Melissa M. Phillips

For over 40 years, food-matrix certified reference materials (CRMs) have been available for the determination of trace element content, and a wide variety of materials are available from most producers of CRMs. However, the availability of food-matrix CRMs

CCQM-K131 Low-Polarity Analytes in a Multicomponent Organic Solution: Polycyclic Aromatic Hydrocarbons (PAHs) in Acetonitrile

November 30, 2018

Author(s)

David L. Duewer, Lane C. Sander, Stephen A. Wise

Solutions of organic analytes of known mass fraction are typically used to calibrate the measurement processes used to determine these compounds in matrix samples. Appropriate value assignments and uncertainty calculations for calibration solutions are

CCQM-K95.1 Low-Polarity Analytes in a Botanical Matrix: Polycyclic Aromatic Hydrocarbons (PAHs) in Tea

November 30, 2018

Author(s)

David L. Duewer, Jacolin A. Murray, Laura J. Wood, Stephen A. Wise

Extraction, chromatographic separation, and quantification of low-concentration organic compounds in complex matrices are core challenges for reference material producers and providers of calibration services. Evidence of successful participation in formal

Determination of test cycle sensitivity coefficients for the Rockwell HR45N hardness scale

November 23, 2018

Author(s)

Samuel R. Low III, Renato R. Machado

This article describes work carried out to determine test cycle sensitivity coefficients for the Rockwell HR45N hardness scale. Sensitivity coefficients were determined for the preliminary- force, total-force and recovery-force dwell times. The work was

Technique to reduce bending issues in Rockwell B scale hardness reference blocks: preliminary results

November 23, 2018

Author(s)

Samuel R. Low III, Renato R. Machado

This paper describes a new design for HRBW scale reference blocks, that has the potential to greatly reduce the bending of brass blocks and thus improve short time stability of the blocks apparent reference value. The experimental results given here are

NIST Handbook 150-8, NVLAP Acoustical Testing Services

November 19, 2018

Author(s)

Kari K. Harper

NIST Handbook 150-8 presents technical requirements and guidance for the accreditation of laboratories under the National Voluntary Laboratory Accreditation Program (NVLAP) Acoustical Testing Services program. It is intended for information and use by

Thirty-year Stability of Standard Reference Material(R) 2034 Holmium Oxide Solution Wavelength Standard for Spectrophotometry

October 31, 2018

Author(s)

Melody V. Smith, David L. Duewer, John C. Travis

Standard Reference Material (SRM) 2034, Holmium Oxide Solution Wavelength Standard (240 nm to 650 nm), was produced periodically from 1985 to 2015. The expiration date for the units of each production run increased with experience until 1995 when a period

Co-Operation in Publicly Funded Reference Material Production Meeting Report

October 12, 2018

Author(s)

Steven J. Choquette, Hakan Emteborg, Doris florian, Stephen Ellison, Lindsay Mackay, Pearse McCarron

The meeting was organized by the European Commission's Joint Research Centre, and held at the JRC-Geel site on 22-23 February, 2018. It was a follow-up of a similar meeting held in 2009. The objective of the meeting was to exchange information about

Innovative Approaches to Combat Healthcare-Associated Infections Using Efficacy Standards Developed Through Industry and Federal Collaboration

October 5, 2018

Author(s)

Dianne L. Poster, Carl C. Miller, Yaw S. Obeng, Michael T. Postek, Troy E. Cowan, Richard A. Martinello

Nation-wide, healthcare-associated infections (HAIs) infect one in every 25 hospital patients, account for more than 100,000 deaths and increase medical costs by around $96-147B, each year. Ultraviolet-C (UV-C) antimicrobial devices are shown to reduce the

Development of a new reversed-phase liquid chromatography and fluorescence method with multichannel selective wavelength detection for the analysis of benzo[a]pyrene and six of its isomers

September 28, 2018

Author(s)

Walter B. Wilson, Stephen A. Wise, Lane C. Sander

The baseline separation of benzo[a]pyrene in complex samples via reversed-phase liquid chromatography (RPLC) is particularly challenging due to the potential for interferences from other molecular mass 252 (MM, g/mol) polycyclic aromatic hydrocarbons (PAHs

Harmonization of LC-MS/MS protein assays

September 24, 2018

Author(s)

Alan L. Rockwood, Mark Lowenthal, Cory Bystrom

Harmonization of diagnostic test results is fundamental to the effective use of laboratory testing in the diagnosis, treatment and monitoring of disease. Formal approaches to harmonization and standardization provide a rigorous and high quality Roadmap to

Atom Probe Tomography Analysis of the Reference Zircon GJ-1: A Round-Robin Experiment

September 20, 2018

Author(s)

Ann C. Chiaramonti Debay, Paul T. Blanchard, Alexandre La Fontaine, Florent Exertier, Sandra Piazolo, Elena Belousova, Zirong Peng, Baptiste Gault, David W. Saxey, Denis Fougerouse, Steven Reddy, Julie Cairney

In recent years, atom probe tomography (APT) has been increasingly used to study minerals, and in particular Zircons. The mineral Zircon (ZrSiO4) is ideally suited for geochronology by utilising the U-Th-Pb isotope systems, and trace element compositions