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Chemistry

Analytical chemistry

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  • Published Date
Displaying 1 - 25 of 2084

Securing the Future of NMR Metabolomics Reproducibility: A Call for Standardized Reporting

September 15, 2025
Author(s)
Tracey Johnston, Fabio Casu, Amanda Bayless, Erik Andersson, Robert Brua, Munki Choo, Arthur S. Edison, Hamid R. Eghbalnia, Candace Fleischer, Goncalo J Gouveia, Jeffrey C. Hoch, Gagandeep Kaur, Da-Wei Li, Wimal Pathmasiri, Istvan Pelczer, Fay Probert, Daniel Raftery, David Rovnyak, Michael Secreto, Panteleimon Takis, Mario Uchimiya, David S Wishart, Ali Yilmaz, Lloyd Sumner, Robert Powers, Valerie Copie, Teklab Gebregiworgis
Metabolomics has been a rapidly growing multidisciplinary field with ever increasing demand and usability, attracting a surge of new researchers. While their varied skill sets, questions, and approaches enrich the field with fresh perspectives and

Kelvin probe force microscopy under ambient conditions

August 21, 2025
Author(s)
Amirhossein Zahmatkeshsaredorahi, Ruben Millan-Solsona, Devon Jakob, Liam Collins, Xiaoji Xu
Kelvin Probe Force Microscopy (KPFM), a technique derived from Atomic Force Microscopy (AFM), provides nanometer-scale spatial resolution for mapping surface potential or work function differences across material systems. It serves as a powerful tool for

Solvent Exclusion Effect on Infrared Absorption Spectroscopy

July 9, 2025
Author(s)
Young Lee, Charles Camp, Bonghwan Chon, Seong-Min Kim, Sang Hak Lee
Absorption spectroscopy of a solution containing an analyte solute typically uses the transmission through a solvent as a reference based on the assumption that the solvent does not absorb light. However, when a solvent absorbs light, the resulting

Characterization of the trimethyl silyl derivatives of 6-Amino-3-methyl-1,4-diphenyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile and its analogs by electron ionization gas chromatography/mass spectrometry

June 27, 2025
Author(s)
Quan-Long Pu, Yufang Zheng, Edward P. Erisman
Pyranopyrazoles have broad applications as pharmaceutical ingredients and biodegradable agrochemicals. The most extensively investigated are the pyrano[2,3 c]pyrazoles, with new synthetic products continually emerging. Gas chromatography/mass spectrometry

A Comparison of Bulk with Micro-Volume Elemental Values for NIST SRM 610 and NIST SRM 612

June 26, 2025
Author(s)
Nicholas Sharp, Maria Isabel Vega Martinez, Ruthmara Corzo, Blaza Toman, Rick Paul, Jamie Weaver
NIST SRM 610 and 612 (Trace Elements in Glass) are routinely used for microanalytical measurements but were designed to be bulk-scale reference materials. This study investigates an approach to quantify the differences between values for elements obtained

Size-exclusion chromatography with multi-angle static light scattering

June 26, 2025
Author(s)
Andre Striegel, Amandaa Brewer, Claudia Zielke
Size-exclusion chromatography coupled with multi-angle static light scattering (SEC/MALS) is a combined separation and detection technique that is principally used for determining the molar mass of natural and synthetic macromolecules and colloidal

A re-assessment of archived (1989-2006) beluga liver from the North American Arctic with non-targeted analysis reveals brominated chemicals of emerging concern

May 1, 2025
Author(s)
Jacqueline Bangma, Chris Fuller, James McCord, Heather Whitehead, Richard Liberatore, Jason Boettger, Amanda Moors, Rebecca Pugh, Steven O'Connell, Jessica Reiner
In 2011, 68 archived beluga whale (Delphinapterus leucas) liver samples collected from Cook Inlet and the eastern Chukchi Sea from 1989 to 2006 were characterized for 12 per- and polyfluoroalkyl substances (PFAS) using targeted mass spectroscopy (MS)

Cannabis Laboratory Quality Assurance Program: Exercise 3 Moisture Final Report

April 28, 2025
Author(s)
Andrea Yarberry, Charles Barber, Laura Wood, Walter Wilson
NIST launched a Cannabis Laboratory Quality Assurance Program (CannaQAP) in 2020 to assist laboratories in demonstrating and improving cannabis (hemp and marijuana) measurement comparability and competence. CannaQAP provided tools that allowed analysts and

Photolysis of the peptide bond at 193 and 222 nm

April 25, 2025
Author(s)
Nicholas Drachman, Jacob Vietorisz, Andrew Winchester, Rob Vest, Gregory Cooksey, Sujitra Pookpanratana, Derek Stein
Ultraviolet (UV) light is a well-established tool for fragmenting peptides in vacuum. This study investigates the fragmentation of peptides using 193 and 222 nm light in aqueous solution. Changes in the absorption spectra of solutions of the model

Certification of Standard Reference Material(R) 956e Electrolytes in Frozen Human Serum

April 2, 2025
Author(s)
Lee Yu, Steven Christopher, Regina Easley, Monique Johnson, Dennis Leber, Thomas Vetter, Jason Waters, Charles Barber, Karen Murphy, Laura Wood, Stephen Chin, Murli Narayan, Alexander Rhodes, Michael Nash
The National Institute of Standards and Technology (NIST) Standard Reference Material® (SRM®) 956e Electrolytes in Frozen Human Serum is intended for use in the calibration and validation of procedures and methods employed in clinical analysis for the

Chapter 12 - Standard reference materials for the determination of trace organic constituents in environmental samples

April 1, 2025
Author(s)
Jessica Reiner, Bruce Benner, Jennifer Lynch, Jacolin Murray, Alix Rodowa, Meredith Evans Seeley, Katherine Shaw, Benjamin Place
Standard Reference Materials (SRMs) are homogeneous, well-characterized materials that are used to validate measurements and improve the quality of analytical data. NIST, the National Institute of Standards and Technology, has a wide variety of SRMs useful

Suspect Screening of Per- and Polyfluoroalkyl Substances in New Firefighter Turnout Gear Textiles

March 20, 2025
Author(s)
Andrew Maizel, Andre Thompson, Benjamin Place, Alix Rodowa, Jessica Reiner, Audrey Tombaugh, Halen Solomon, Brittany Stinger, Michelle Donnelly, Rick Davis
Firefighter turnout gear provides protection from exposure to flame, heat, and liquids, but has also been found to contain numerous per- and polyfluoroalkyl substances (PFAS). Previous examinations of PFAS in firefighter turnout gear have predominantly

Certification of Standard Reference Material(R) 965c Glucose in Frozen Human Serum

March 13, 2025
Author(s)
Amanda Bayless, William Davis, Elena Wood, Abraham Kuri Cruz, Johanna Camara, Blaza Toman, Komal Dahya, Katherine Earl, Chui Tse, Uliana Danilenko, Hubert Vesper
Standard Reference Material (SRM) 965c Glucose in Frozen Human Serum is intended for use in validating methods for the determination of glucose in human serum and plasma. A unit of SRM 965c consists of three ampoules each of four materials: Level 1, Level
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