Publications

Displaying 76 - 87 of 87

Determination of fortified and endogenous folates in food-based Standard Reference Materials by liquid chromatography-tandem mass spectrometry

January 26, 2013

Author(s)

Johanna Camara, Mark S. Lowenthal, Karen W. Phinney

The National Institute of Standards and Technology (NIST) is developing a wide variety of Standard Reference Materials (SRMs) to support measurements of vitamins and other nutrients in foods. Previously, NIST has provided SRMs with values assigned for the

Expression and characterization of 15N-labeled human C-reactive protein in Escherichia coli and Pichia pastoris for use in isotope-dilution mass spectrometry

September 1, 2012

Author(s)

Eric L. Kilpatrick, Wei-Li Liao, Johanna Camara, Illarion V. Turko, David M. Bunk

Isotope dilution mass spectrometry using stable isotope labeled internal standards is unsurpassed in its ability to quantify analytes with accuracy and low measurement uncertainty. The extension of this technique to proteins relies upon the expression of

An international assessment of the metrological equivalence of higher-order measurement services for creatinine in serum

April 2, 2012

Author(s)

Johanna Camara, Katrice A. Lippa, David L. Duewer, Hugo H. Gasca-Aragon, Blaza Toman

Background: The CCQM-K80 Key Comparison directly assessed the equivalence of many of the worlds higher-order value-assigned materials (HOVAMs) for creatinine in human serum. This 2009 international study compared the certified values and uncertainties of

Discrimination Between Wild-Type and Ampicillin-Resistant Escherichia coli by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry

October 16, 2008

Author(s)

Johanna Camara

Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) was optimized to discriminate between wild-type and ampicillin-resistant Escherichia coli. Only ampicillin-resistant E. coli displayed an m/z 29000 peak

Discrimination between Wild-Type and Ampicillin-Resistant Escherichia coli by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry

October 1, 2007

Author(s)

Johanna Camara, F. A. Hays

Quantitative Determination of Disaccharide Content in Digested Unfragmented Heparin and Low Molecular Weight Heparin by Direct-Infusion Electrospray Mass Spectrometry

October 1, 2007

Author(s)

Johanna Camara, Mary B. Satterfield, Bryant C. Nelson

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