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Search Publications by: Katrice A. Lippa (Fed)

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Displaying 51 - 75 of 83

Breakfast Cereal Sampling Study for Nutritional Elements

February 5, 2013
Author(s)
Laura J. Wood, Katrice A. Lippa, Melissa M. Phillips, Catherine A. Rimmer, Nathanael A. Heckert, Stefan D. Leigh, Amanda J. Moors, Rebecca S. Pugh
The National Institute of Standards and Technology (NIST) has established a Dietary Supplement Laboratory Quality Assurance Program (DSQAP) in collaboration with the National Institutes of Health Office of Dietary Supplements (NIH-ODS). The DSQAP designed

Effect of Polymer Degree of Conversion on Streptococcus mutans Biofilms

October 5, 2012
Author(s)
Alison M. Kraigsley, Kathy Tang, John A. Howarter, Katrice Lippa, Sheng Lin-Gibson, Nancy Lin
The effects of key material properties of polymeric composite restorations on cariogenic oral biofilms are needed to provide insight into the materials' role in recurrent caries. The objective of this study was to quantify the effects of degree of

Dietary Supplement Laboratory Quality Assurance Program: The First Five Exercises

August 17, 2011
Author(s)
Melissa M. Phillips, Catherine A. Rimmer, Laura J. Wood, Katrice A. Lippa, Katherine E. Sharpless, David L. Duewer, Lane C. Sander, J. M. Betz
The National Institute of Standards and Technology (NIST) has established a Dietary Supplement Quality Assurance Program (DSQAP) in collaboration with the National Institutes of Health (NIH) Office of Dietary Supplements (ODS). Program participants measure

Architecture and Dynamics of C18 Bonded Interphases with Small Molecule Spacers

December 15, 2009
Author(s)
Lane C. Sander, Katrice A. Lippa, Catherine A. Rimmer, Maximilian Kuhnle, Volker Friebolin, Klaus Albert
The relationship between alkyl phase structure and chromatographic performance is investigated for a series of octadecyl (C18)- modified silica surfaces with defined spacing of the alkyl surface by a “pre-endcapping” technique. Stationary phases were

Evaluation of the state-of-the-art measurement capabilities for selected PBDEs and decaBB in plastic by the international intercomparison CCQM-P114

December 9, 2009
Author(s)
Michele M. Schantz, Katrice A. Lippa, R. Zeleny, S. Voorspoels, M. Ricci, Dorit Becker, M. Sittidech, A.M.F. Wong, D.H. Kim, S. Mingwu, S. Matsuyama
An international intercomparison involving eight National Metrology Institutes (NMIs) was conducted to establish their current measurement capabilities for determining five selected congeners from the brominated flame retardant classes polybrominated

Demonstrating the Comparability of Certified Reference Materials

July 24, 2009
Author(s)
David L. Duewer, Katrice A. Lippa, Stephen E. Long, Karen E. Murphy, Katherine E. Sharpless, Lorna T. Sniegoski, Michael J. Welch
Certified Reference Materials (CRMs) enable the meaningful comparison of measurement results over time and place. When CRMs are used to calibrate or verify the performance of a measurement system, results produced by that system can be related through the

DSQAP Exercise C Report

June 3, 2009
Author(s)
Catherine A. Rimmer, Laura J. Wood, Katrice A. Lippa, Melissa M. Phillips

Shape Selectivity in Reversed-Phase Liquid Chromatography

October 16, 2008
Author(s)
Katrice Lippa, Kate Rimmer, Lane C. Sander
The separation of shape-constrained solutes in reversed-phase liquid chromatography is generally controlled by subtle differences in molecular shape together with stationary phase and operational parameters that promote stationary phase conformational

Commutability of NIST SRM 1955 Homocysteine and Folate in Frozen Human Serum With Selected Total Homocysteine Immunometric or Enzymatic Assays

March 1, 2008
Author(s)
B C. Nelson, Christine M. Pfeiffer, Ming Zhang, David L. Duewer, Katherine E. Sharpless, Katrice Lippa
Background: The National Institute of Standards and Technology (NIST) and the Centers for Disease Control and Prevention (CDC) have recently developed Standard Reference Material (SRM) 1955 Homocysteine and Folate in Frozen Human Serum with certified