Research Topics
| Katherine E SharplessSummaryAffiliation: National Institute of Standards and Technology Country: USA Publications
| Collaborators
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Detail Information
Publications
Value assignment of nutrient concentrations in standard reference material 2384 baking chocolateKatherine E Sharpless
National Food Processors Association, 1350 I Street NW, Suite 300, Washington, DC 20005, USA
J Agric Food Chem 50:7069-75. 2002..These assigned values were based on measurements by NIST and/or collaborating laboratories...- Filling the AOAC triangle with food-matrix standard reference materialsKatherine E Sharpless
Analytical Chemistry Division, National Institute of Standards and Technology, 100 Bureau Drive Stop 8392, Gaithersburg, MD 20899 8392, USA
Anal Bioanal Chem 378:1161-7. 2004..They may also be used as "primary control materials" in the value-assignment of in-house, secondary, control materials to confirm accuracy as well as to establish traceability to NIST... - Standard reference materials for analysis of dietary supplementsKatherine E Sharpless
National Institute of Standards and Technology, Analytical Chemistry Division, 100 Bureau Dr, Stop 8390, Gaithersburg, MD 20899 8390, USA
J AOAC Int 91:1298-302. 2008..These and other natural-matrix SRMs should be used in method validation, characterization of in-house quality control materials, and to establish traceability... - Value assignment of nutrient and aflatoxin concentrations in standard reference material 2387 peanut butterKatherine E Sharpless
National Institute of Standards and Technology, 100 Bureau Drive Stop 8392, Gaithersburg, Maryland 20899 8392, USA
J Agric Food Chem 51:6745-51. 2003..Aflatoxin levels in peanut butter are regulated by the Food and Drug Administration.).. - Standard reference materials for foods and dietary supplementsKatherine E Sharpless
Analytical Chemistry Division, National Institute of Standards and Technology, 100 Bureau Drive Stop 8390, Gaithersburg, MD 20899 8390, USA
Anal Bioanal Chem 389:171-8. 2007..They may also be used as "primary control materials" in assignment of values to in-house (secondary) control materials to confirm accuracy and to establish measurement traceability to NIST... - Recent developments in food-matrix Reference Materials at NISTK E Sharpless
National Institute of Standards and Technology, Gaithersburg, MD 20899 8392, USA
Fresenius J Anal Chem 370:275-8. 2001.... - Preparation and characterization of standard reference material 1849 infant/adult nutritional formulaKatherine E Sharpless
National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899 8390, USA
J AOAC Int 93:1262-74. 2010.... - Preparation and characterization of a suite of ephedra-containing standard reference materialsKatherine E Sharpless
National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899 8390, USA
J AOAC Int 89:1483-95. 2006.... - Preparation and characterization of standard reference material 3276, carrot extract in oilKatherine E Sharpless
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899 8392, USA
Anal Bioanal Chem 389:207-17. 2007..This material is intended for use as a primary control material when assigning values to in-house (secondary) control materials and for validation of analytical methods for measurement of these analytes in similar matrices... - Determination of vitamins in food-matrix Standard Reference MaterialsK E Sharpless
National Institute of Standards and Technology, Gaithersburg, MD 20899 8392, USA
J Chromatogr A 881:171-81. 2000.... 
Development of saw palmetto (Serenoa repens) fruit and extract standard reference materialsMichele M Schantz
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
Anal Bioanal Chem 392:427-38. 2008..These SRMs will complement other reference materials currently available with concentrations for similar analytes and are part of a series of SRMs being developed for dietary supplements...- Preparation and value assignment of standard reference material 968e fat-soluble vitamins, carotenoids, and cholesterol in human serumJeanice B Thomas
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899 8392, USA
Anal Bioanal Chem 402:749-62. 2012..The value assignment of the analytes in this SRM will help support measurement accuracy and traceability for laboratories performing health-related measurements in the clinical and nutritional communities... 
Dietary supplement laboratory quality assurance program: the first five exercisesMelissa M Phillips
National Institute of Standards and Technology, Analytical Chemistry Division, Material Measurement Laboratory, Gaithersburg, MD 20899 8392, USA
J AOAC Int 94:803-14. 2011..S. Food and Drug Administration. The DSQAP has conducted five exercises to date, with total participation including more than 75 different laboratories and many more individual analysts...- Determination of caffeine and caffeine-related metabolites in ephedra-containing standard reference materials using liquid chromatography with absorbance detection and tandem mass spectrometryJeanice B Thomas
National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899 8392, USA
J AOAC Int 90:934-40. 2007..These SRMs are primarily intended for method validation and for use as control materials to support the analysis of dietary supplements and similar materials... - Determination of ephedrine alkaloids in dietary supplement standard reference materialsLane C Sander
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
Anal Chem 77:3101-12. 2005..The SRMs are primarily intended for method validation and for use as control materials to support the analysis of dietary supplements and related botanical materials... - Characterization of three berry standard reference materials for nutrientsLaura J Wood
National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
J Agric Food Chem 59:7246-52. 2011..Several nutritional elements in these three SRMs are present at lower levels than in other food-matrix SRMs... - Isotope dilution liquid chromatography - mass spectrometry methods for fat- and water-soluble vitamins in nutritional formulationsKaren W Phinney
Analytical Chemistry Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
Anal Chem 83:92-8. 2011..When possible, stable isotope labeled internal standards were employed for quantification... - Characterization of a suite of ginkgo-containing standard reference materialsCatherine A Rimmer
National Institute of Standards and Technology, Gaithersburg, MD 20899 8392, USA
Anal Bioanal Chem 389:179-96. 2007..The SRMs are primarily intended for method validation and for use as control materials to support the analysis of dietary supplements and related botanical materials... - Determination of organic acids in Vaccinium berry standard reference materialsMelissa M Phillips
Analytical Chemistry Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
Anal Bioanal Chem 398:425-34. 2010..The combined data from these methods was used for the assignment of organic acid levels in the seven candidate SRMs... - Mass spectrometric determination of the predominant adrenergic protoalkaloids in bitter orange (Citrus aurantium)Bryant C Nelson
Analytical Chemistry Division, Stop 8392, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899 8392, USA
J Agric Food Chem 55:9769-75. 2007..LC/MS/MS analysis of the protoalkaloids in the SRMs resulted in mean measurement imprecision levels of < or =10% coefficient of variation (% CV)... - Determination of fat-soluble vitamins and carotenoids in standard reference material 3280 multivitamin/multielement tablets by liquid chromatography with absorbance detectionJeanice B Thomas
National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899 8392, USA
J AOAC Int 94:815-22. 2011..SRM 3280 is primarily intended for use in validating analytical methods for the determination of selected vitamins, carotenoids, and elements in multivitamin/multielement tablets and similar matrixes... - Commutability of NIST SRM 1955 Homocysteine and Folate in Frozen Human Serum with selected total homocysteine immunoassays and enzymatic assaysBryant C Nelson
National Institute of Standards and Technology, Biochemical Science Division, Gaithersburg, MD 20899 0001, USA
Clin Chim Acta 395:99-105. 2008..NIST has performed an international, interlaboratory assessment of SRM 1955 commutability; results are reported for tHcy only... - Determination of caffeine, theobromine, and theophylline in standard reference material 2384, baking chocolate, using reversed-phase liquid chromatographyJeanice Brown Thomas
United States Department of Commerce, National Institute of Standards and Technology, Chemical Science and Technology Laboratory, Gaithersburg, Maryland 20899 0001, USA
J Agric Food Chem 52:3259-63. 2004..1, 2.3, and 1.9%, respectively. The limit of quantitation for all analytes was <100 ng/mL. The measurements from this method were used in the value-assignment of caffeine, theobromine, and theophylline in SRM 2384... - Demonstrating the comparability of certified reference materialsDavid L Duewer
Analytical Chemistry Division, National Institute of Standards and Technology NIST, 100 Bureau Drive, Stop 8390, Gaithersburg, MD 20899 8390, USA
Anal Bioanal Chem 395:155-69. 2009.... - Development and certification of a standard reference material for vitamin D metabolites in human serumKaren W Phinney
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
Anal Chem 84:956-62. 2012..Chromatographic resolution of the 3-epimer of 25(OH)D(3) proved to be essential for accurate determination of the metabolites... - Dietary supplement Standard Reference MaterialsLane C Sander
National Institute of Standards and Technology, MD 20899, USA
Life Sci 78:2044-8. 2006.... - Improved liquid chromatography methods for the separation and quantification of biotin in NIST standard reference material 3280: multivitamin/multielement tabletsBryant C Nelson
National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, Maryland 20899 0001, USA
J Agric Food Chem 54:8710-6. 2006.... - Quantitative determination of folic acid in multivitamin/multielement tablets using liquid chromatography/tandem mass spectrometryBryant C Nelson
National Institute of Standards and Technology, Analytical Chemistry Division, 100 Bureau Drive, Stop 8392, Gaithersburg, MD 20899 0001, USA
J Chromatogr A 1135:203-11. 2006..The FA measurement accuracy for both methods was > or =95% (based on the manufacturer's assessment of the FA level in SRM 3280) with corresponding measurement precision values (% RSD) of approximately 1%... - Determination of Bitter Orange alkaloids in dietary supplements standard reference materials by liquid chromatography with ultraviolet absorbance and fluorescence detectionKarsten Putzbach
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
J Chromatogr A 1156:304-11. 2007..The method described was used for the assignment of the levels of the predominant alkaloids in three candidate standard reference materials containing Bitter Orange... - Development of a new standard reference material: SRM 1955 (homocysteine and folate in human serum)Mary B Satterfield
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
Anal Bioanal Chem 385:612-22. 2006..Use of the new SRM should improve clinical measurements and will permit traceability to internationally recognized certified reference materials, as described by European Directive 98/79/EC on in vitro diagnostic medical devices... - Development of liquid chromatographic methods for the determination of phytosterols in Standard Reference Materials containing saw palmettoMary Bedner
National Institute of Standards and Technology, Analytical Chemistry Division, MS 8392, Gaithersburg, MD 20899 8392, USA
J Chromatogr A 1192:74-80. 2008..This is the first reported use of LC-MS to determine phytosterols in saw palmetto dietary supplement materials... - Quantification of the predominant monomeric catechins in baking chocolate standard reference material by LC/APCI-MSBryant C Nelson
Analytical Chemistry Division, National Institute of Standards and Technology NIST, Gaithersburg, Maryland 20899 0001, USA
J Agric Food Chem 51:531-7. 2003.... - An LC-ESI/MS method for determining theanine in green tea dietary supplementsMary Bedner
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899 8392, USA
Anal Bioanal Chem 397:1773-7. 2010..The theanine response was linear over several orders of magnitude, and excellent measurement precision was obtained for all three materials using the developed method... - Preparation and value assignment of Standard Reference Material 968c Fat-Soluble Vitamins, Carotenoids, and Cholesterol in Human SerumJ Brown Thomas
National Institute of Standards and Technology, Gaithersburg, MD 20899 8392, USA
Clin Chim Acta 305:141-55. 2001..The assigned values for cholesterol in the SRM are the means of results obtained using the NIST definitive method, gas chromatography-isotope dilution mass spectrometry... - The certification of SRM 1546--Meat Homogenate, a new reference material for nutrients in a high protein, high fat matrixM J Welch
Analytical Chemistry Division, United States Department of Commerce, Gaithersburg, MD 20899, USA
Fresenius J Anal Chem 370:42-7. 2001..SRM 1546 will provide laboratories with a means to evaluate the accuracy of the methods they use to assign nutrient levels to processed meats and similar products... - NIST micronutrients measurement quality assurance program: characterizing the measurement community's performance over timeD L Duewer
Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 8394, USA
Anal Chem 72:4163-70. 2000..The reported measurement performance characteristics may be of interest to clinical, nutritional, and epidemiological studies involving any of these measurands. The data analysis techniques utilized may be applicable to other programs... - The stability of retinol, alpha-tocopherol, trans-lycopene, and trans-beta-carotene in liquid-frozen and lyophilized serumJ Brown Thomas
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
Clin Chim Acta 276:75-87. 1998..Retinol, alpha-tocopherol, trans-lycopene, and trans-beta-carotene in reconstituted lyophilized serum stored at -20 degrees C were stable for at least 3 days with minimal (< 5) freeze/thaw cycles... - NIST micronutrients measurement quality assurance program: characterizing individual participant measurement performance over timeD L Duewer
Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
Anal Chem 72:3611-9. 2000..We document and discuss recurrent patterns we observe in the measurement performance characteristics for M2QAP participants. The graphical analysis techniques utilized may be applicable to other interlaboratory comparison programs... - Certification of standard reference materials containing bitter orangeL C Sander
National Institute of Standards and Technology, Chemical Science and Technology Laboratory, 100 Bureau Drive, MS 8392, Gaithersburg, MD 20899 8392, USA
Anal Bioanal Chem 391:2023-34. 2008..The bitter-orange-containing dietary supplement SRMs are intended primarily for use as measurement controls and for use in the development and validation of analytical methods... - Micronutrients Measurement Quality Assurance Program: helping participants use interlaboratory comparison exercise results to improve their long-term measurement performanceD L Duewer
Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
Anal Chem 71:1870-8. 1999..This report documents the semantic and graphical tools developed to help interlaboratory-comparison-exercise participants interpret their own measurement performance... - Certification of SRM 1589a PCBs, pesticides, PBDEs, and dioxins/furans in human serumMichele M Schantz
Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
Anal Bioanal Chem 389:1201-8. 2007.... - Milk and serum standard reference materials for monitoring organic contaminants in human samplesMichele M Schantz
Analytical Chemistry Division, National Institute of Standards and Technology NIST, Gaithersburg, MD 20899, USA
Anal Bioanal Chem 405:1203-11. 2013..This agreement suggests that there were no significant biases existing among the multiple methods used for analysis... - C30 stationary phases for the analysis of food by liquid chromatographyL C Sander
Analytical Chemistry Division, National Institute of Standards and Technology (NIST, Gaithersburg, MD 20899-8392, USA
J Chromatogr A 880:189-202. 2000..This report provides a comprehensive review of applications of polymeric C30 columns, utilized in the determination of carotenoids, retinoids, and other nutrients and related compounds in complex, natural-matrix samples... - Committee on Food NutritionDavid C Woollard
AgriQuality NZ Ltd, Auckland, New Zealand
J AOAC Int 88:371-2. 2005 - Determination of bitter orange alkaloids in dietary supplement Standard Reference Materials by liquid chromatography with atmospheric-pressure ionization mass spectrometryKarsten Putzbach
RCC Ltd, Zelgliweg 1, CH 4452, Itingen, Switzerland
Anal Bioanal Chem 389:197-205. 2007..This method enabled the determination of the dominant alkaloid synephrine and other minor alkaloids in a variety of dietary supplement SRMs... - Reference materials to evaluate measurement systems for the nutrient composition of foods: results from USDA's National Food and Nutrient Analysis Program (NFNAP)Katherine M Phillips
Biochemistry Department, Virginia Polytechnic Institute and State University, 304 Engel Hall, Blacksburg, VA 24061, USA
Anal Bioanal Chem 389:219-29. 2007..For Na almost all high Z'-scores were for low-Na matrices, suggesting analytical problems related to concentration. Figure Z'-scores for vitamins in certified reference materials... - Measuring vitamins and minerals in dietary supplements for nutrition studies in the USAJohanna T Dwyer
Office of Dietary Supplements, National Institutes of Health, US Department of Health and Human Services, Bethesda, MD 20892, USA
Anal Bioanal Chem 389:37-46. 2007..The DSID should be helpful to researchers in assessing relationships between intakes of vitamins and minerals and health outcomes...