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Chemistry

Analytical chemistry

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  • Published Date
Displaying 1 - 25 of 2094

Certification of Standard Reference Material(R) 1568c Rice Flour

January 15, 2026
Author(s)
Laura Wood, Charles Barber, Colleen Bryan Sallee, Monique Johnson, Shaun Kotoski, Stephen Long, Tomohiro Narukawa, Rick Paul, Nicholas Sharp, John Sieber, Maria Isabel Vega Martinez, James Yen, Lee Yu
The National Institute of Standards and Technology (NIST) SRM 1568c Rice Flour has value assignments for over 30 analytes, including arsenic species. This material is intended to be used for the evaluation of methods for the determination of elements and

Certification of Standard Reference Material 2921a

January 12, 2026
Author(s)
David Bunk, David Newton
The National Institute of Standards and Technology (NIST) Standard Reference Material® (SRM®) 2921a Human Cardiac Troponin Complex delivers a certified value for the concentration of human cardiac troponin I in a solution of the human cardiac troponin

Certification of Standard Reference Material(R) 2890a Water in 1-Octanol

January 8, 2026
Author(s)
Brian Lang, Jacolin Murray, Adam Pintar
Standard Reference Material (SRM) 2890a Water in 1-Octanol is intended for use in validating methods and calibrating instruments for the measurement of trace concentration levels of water. SRM 2890a is a solution of water in 1-octanol which is certified

Plastic and Non-Plastic Particles in the Sand of Tetiaroa Atoll

January 8, 2026
Author(s)
Katherine Lasdin, Nuria Viladrich Canudas, Katherine Shaw, Pierrick Harnay, Romina Centurion, Jacqueline Padilla-Gamino
Quantifying plastic debris in remote and pristine natural environments is critical for assessing the extent of global pollution and its potential effects on biodiversity. This study assessed the abundance and composition of plastic particles in the sand of

An In-depth Study Evaluating the Determination of CBD, D9-THC, D8-THC, and 25 Additional Cannabinoids in Cannabis Concentrates by Liquid Chromatography with Absorbance Detection

December 15, 2025
Author(s)
Walter Wilson, Arianna Romares, STEPHEN GOLDMAN
Cannabis revenue has risen in the United States (US) from $16.5B in 2018 to $45.4B in 2025 [1], which can be attributed to the legalization of hemp in 2018 with the passage of the Agricultural Improvement Act of 2018 (2018 Farm Bill) and the surge of

The Need for Standardization of Extracellular Vesicle Characterization Methods

October 1, 2025
Author(s)
Bryant Nelson, Wyatt Vreeland
Extracellular vesicles (EVs) are secreted from all living organisms. The application of EVs in therapeutics, clinical diagnostics and drug delivery is expanding rapidly and the EV field is set to capitalize on this expansion through the development of next

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

Single-molecule biodosimetry

August 20, 2025
Author(s)
Michael Lamontagne, Shannon Newell, Ileana Pazos, Ronald Tosh, Jerimy Polf, Michael Zwolak, Joseph Robertson
Inferring characteristics of radiation exposure using biological molecules is extremely challenging and current methods lack a direct connection between dose and molecular response in many settings. Here, we demonstrate that resistive–pulse nanopore

Comparison of Bulk and Micro Sampling Techniques for the Elemental Analysis of SRM 610 and 612

July 25, 2025
Author(s)
Nicholas Sharp, Maria Isabel Vega Martinez, Ruthmara Corzo, Blaza Toman, Rick Paul, Savelas Rabb, Jack Prothero, Jamie Weaver
The glass Standard Reference Materials (SRM) 610 and 612 are frequently used for microanalysis by the forensic and geological communities. However, SRM 610 and 612 were designed and certified to be used as bulk-scale reference materials for the analysis of

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
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