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Search Publications by: Michael Nelson (Fed)

Displaying 26 - 29 of 29

Evaluation of chemical purity using quantitative 1H-nuclear magnetic resonance

September 28, 2016

Author(s)

Blaza Toman, Michael A. Nelson, Katrice A. Lippa

Chemical purity assessment using quantitative 1H-nuclear magnetic resonance spectroscopy is a method based on ratio references of mass and signal intensity of the analyte species to that of chemical standards of known purity. As such, it is an example of a

Metrological approaches to organic chemical purity: primary reference materials for vitamin D metabolites

September 7, 2015

Author(s)

Michael A. Nelson, Mary Bedner, Brian E. Lang, Blaza Toman, Katrice A. Lippa

Given the critical role of pure, organic compound primary reference standards used to characterize and certify chemical Certified Reference Materials (CRMs), it is essential that associated mass purity assessments be fit-for-purpose, represented by an

Candidate Reference Measurement Procedure for the Determination of 24R,25-Dihydroxyvitamin D3 in Human Serum using Isotope-Dilution Liquid Chromatography-Tandem Mass Spectrometry

July 14, 2015

Author(s)

Susan Tai, Michael A. Nelson

The two major forms of vitamin D, vitamin D3 and vitamin D2, are metabolized in the liver through hydroxylation to 25-hydroxyvitamin D species, and then further hydroxylated in the kidney to various dihydroxyvitamin D species. 24R,25-Dihydroxyvitamin D3

Contemporary Fraction of bis(2-ethylhexyl) Phthalate in Stilton Cheese by Accelerator Mass Spectrometry

May 17, 2013

Author(s)

Michael A. Nelson, John M. Ondov, Michael C. VanDerveer, Bruce A. Buchholz

Measurements of the 14C abundance in five samples of bis(2-ethylhexyl) phthalate (DEHP) isolated from Stilton cheese were made by Accelerator Mass Spectrometry (AMS) to determine the fraction of carbon originating from contemporary biogenic sources. DEHP

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