Joseph M BetzSummaryAffiliation: National Institutes of Health Country: USA Publications
| Collaborators
|
Detail Information
Publications
Accuracy, precision, and reliability of chemical measurements in natural products researchJoseph M Betz
Office of Dietary Supplements, US National Institutes of Health, Bethesda, MD 20892 7517, USA
Fitoterapia 82:44-52. 2011..Accordingly, this review discusses the principles of accuracy (relationship between experimental and true value), precision (distribution of data values), and reliability in the quantitation of phytochemicals in natural products...
The NIH analytical methods and reference materials program for dietary supplementsJoseph M Betz
Office of Dietary Supplements ODS, National Institutes of Health, 6100 Executive Blvd, Bethesda, MD 20892 2082, USA
Anal Bioanal Chem 389:19-25. 2007..The framework facilitates validation of analytical methods, analytical standards, and reference materials...- Dietary supplement use in the United States, 2003-2006Regan L Bailey
National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892 7517, USA
J Nutr 141:261-6. 2011..Given the widespread use of supplements, data should be included with nutrient intakes from foods to correctly determine total nutrient exposure... - 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... - Development of the analytical methods and reference materials program for dietary supplements at the National Institutes of HealthLeila G Saldanha
National Institutes of Health, Office of Dietary Supplements, 6100 Executive Blvd, Rm 3B01, MSC 7517, Bethesda, MD 20892 7517, USA
J AOAC Int 87:162-5. 2004..Stakeholder's opinions and views expressed at these 3 meetings are outlined in this report... - Unmetabolized serum folic acid and its relation to folic acid intake from diet and supplements in a nationally representative sample of adults aged > or =60 y in the United StatesRegan L Bailey
Office of Dietary Supplements, National Institutes of Health, Bethesda, MD, USA
Am J Clin Nutr 92:383-9. 2010..Unmetabolized serum folic acid (UMFA) has been detected in adults. Previous research indicates that high folic acid intakes may be associated with risk of cancer... - Nanotechnology research: applications in nutritional sciencesPothur R Srinivas
Atherothrombosis and Coronary Artery Diseases Branch, Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, Bethesda, MD 20892, USA
J Nutr 140:119-24. 2010..These efforts could facilitate exploration of previously inaccessible cellular compartments and intracellular pathways and thus uncover strategies for new prevention and therapeutic modalities... - 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.... - 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... - Role of accurate methodology in demonstrating the safety and efficacy of phytoestrogensG Sarwar Gilani
J AOAC Int 89:1120. 2006 
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...- Determination of aflatoxins B1, B2, G1, and G2 and ochratoxin A in ginseng and ginger by multitoxin immunoaffinity column cleanup and liquid chromatographic quantitation: collaborative studyMary W Trucksess
U S Food and Drug Administration, 5100 Paint Branch Pkwy, College Park, MD 20740, USA
J AOAC Int 91:511-23. 2008..5 to 10.7% for OTA. Relative standard deviations for between-laboratory reproducibility (RSDR) ranged from 5.7 to 28.6% for AF, and from 5.5 to 10.7% for OTA. HorRat values were < or = 2 for the multi-analytes in the 2 matrixes... - Evaluation of commercial kava extracts and kavalactone standards for mutagenicity and toxicity using the mammalian cell gene mutation assay in L5178Y mouse lymphoma cellsPaul Whittaker
Center for Food Safety and Applied Nutrition, Food and Drug Administration, 5100 Paint Branch Parkway, HFS 717, College Park, MD 20740 3835, USA
Food Chem Toxicol 46:168-74. 2008..Neither the kava samples nor the kavalactones induced a mutagenic response in the L5178Y mouse lymphoma mutation assay with the addition of human liver S9 activation... - The caffeine contents of dietary supplements commonly purchased in the US: analysis of 53 products with caffeine-containing ingredientsKaren W Andrews
Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, US Department of Agriculture, Beltsville, MD, USA
Anal Bioanal Chem 389:231-9. 2007..Lot-to-lot variability (n = 2 or 3) for caffeine in most products (72%) was less than 10%... - Determination of synephrine in bitter orange raw materials, extracts, and dietary supplements by liquid chromatography with ultraviolet detection: single-laboratory validationMark C Roman
ChromaDex, 13161 56th Ct, Suite 201, Clearwater, FL 33760, USA
J AOAC Int 90:68-81. 2007..Recoveries of the minor components ranged from 99.1 to 103% at approximately 6000 microg/g spike level, to 90.7 to 120% at 300 microg/g spike level... - Use of multitoxin immunoaffinity columns for determination of aflatoxins and ochratoxin A in ginseng and gingerMary W Trucksess
U S Food and Drug Administration, 5100 Paint Branch Pkwy, College Park, MD 20740, USA
J AOAC Int 90:1042-9. 2007....