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Chemistry

Analytical chemistry

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Displaying 601 - 625 of 4041

SURVEY OF PEPTIDE QUANTIFICATION METHODS AND THEIR REPRODUCIBILITY COMPARISON: A CASE STUDY USING OXYTOCIN

March 20, 2019
Author(s)
Chensheng Li, Sitaram Bhavaraju, Jeremy Melanson, Andreas Blomgren, Torgny Rundlof, Eric L. Kilpatrick, Timothy Rudd, Yves Aubin, Kevin Grant, Edward Saravolac, Tursun Kerim, William Sherman, Yukari Nakagawa, Sergi Pavon, Tim Weel, Arunima Pola, Dinesh Chalasani, Stephen Walfish, Fouad Atouf
USP's peptide reference standards content is typically determined using an HPLC assay against an external standard for which the purity was determined by a mass balance approach. To explore the use of other analyti-cal methods, the USP Biologics Department

interlab: A Python module for analyzing interlaboratory comparison data

March 15, 2019
Author(s)
David A. Sheen
interlab was developed as a software tool to perform consensus analysis on spectral data from interlaboratory studies. It is designed to estimate the spread in the spectral data and to identify possible outliers among both spectral populations and

Lipidomics for wildlife disease etiology and biomarker discovery: a case study of pansteatitis outbreak in South Africa

March 5, 2019
Author(s)
John Bowden, Jeremy P. Koelmel, Candice Z. Ulmer, Susan Fogelson, Hannes Botha, Christina M. Jones, Jackie T. Bangma, Theresa M. Cantu, Matthew P. Guillette, Wilmien Luus-Powell, Joseph Sara, Willem J. Smit, Korin Albert, Harmony Miller, Berkley Olsen, Jason A. Cochran, Timothy J. Garrett, Richard A. Yost
Lipidomics is a promising tool to determine biomarkers and elucidate mechanisms associated with anthropogenic-induced stress in wildlife. Therefore, we examine the application of lipidomics for in situ studies on Mozambique tilapia (Oreochromis mossambicus

COMPOSITION DETERMINATION OF LOW-PRESSURE GAS-PHASE MIXTURES BY 1H NMR SPECTROSCOPY

March 4, 2019
Author(s)
Chris Suiter, Mark O. McLinden, Thomas J. Bruno, Jason A. Widegren
1H NMR spectroscopy was used to analyze vapor-phase mixtures of methane and propane at low to moderate pressures. The mixtures were prepared gravimetrically and had low uncertainty in their composition. The primary mixture used for this work had a methane

Analysis of Iron in Water using a Simple LED Spectrophotometer

February 15, 2019
Author(s)
Benjamin J. Place
Access to clean water is a vitally important part of the lives of all people, yet there is often a concern about the contamination of water by heavy metals. The detection and measurement of heavy metals in water can be performed using colorimetric reagents

Headspace Analysis: Purge and Trap

February 15, 2019
Author(s)
Thomas J. Bruno, Megan E. Harries
Headspace analysis is a technique for sampling and examining the volatiles in a solid or liquid sample. The term headspace refers to the volume of vapor above a condensed phase sample. Purge and trap refers to the headspace technique in which volatile

Headspace Analysis: Static

February 15, 2019
Author(s)
Thomas J. Bruno, Megan E. Harries
Headspace analysis is a technique for sampling and examining the volatiles in a solid or liquid sample. The term headspace refers to the volume of vapor above a condensed phase sample. For most headspace analyses, the sample and its associated headspace

ASTM E2677: Web-based International Standard on Limit of Detection for Explosive Trace Detectors (and More) - Opioids and Ozone

February 12, 2019
Author(s)
R M. Verkouteren, Nathanael A. Heckert, Stefan D. Leigh, Edward R. Sisco, James E. Norris, Jeffrey A. Lawrence, Amber Burns
The performance characteristics of explosive and narcotic trace detectors are mission-critical to agencies worldwide that are charged with protection of the public, defense for mass transit and infrastructure, and the safety of first responders. Commercial

A status of temporal trends of persistent organic pollutants in Arctic biota

February 1, 2019
Author(s)
Frank Riget, Anders Bignert, Birgit Braune, Maria Dam, Rune Dietz, Marlene Evans, Norman Green, Helga Gunnlaugsdottir, Katrin S. Hoydal, John Kucklick, Robert Letcher, Derek Muir, Stacy Schuur, Christian Sonne, Stern Gary, Gregg Tomy, Katrin Vorkamp, Simon Wilson
More than 1000 time-series of persistent organic pollutants (POPs) in Arctic biota from marine and freshwater ecosystems some extending back to the beginning of 1980s were analyzed using a robust statistical method. The Arctic area encompassed extended
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