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J. Betz · SciRah

Researcher profile · Semantic Scholar

J. Betz

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J. Betz — researcher profile on SciRah

h-index: 37
Works: 171
Citations: 5,193

Most-cited papers

Dietary supplement use in the United States, 2003-2006.
Regan L. Bailey, J. Gahche, Cindy V Lentino, J. Dwyer +5 more
2011Journal of NutriLife818 citations Open access
Semantic Scholar
Encyclopedia of Dietary Supplements
P. Coates, M. Blackman, J. Betz, G. Cragg +3 more
2010317 citations
Semantic Scholar
Role of the National Institute of Standards and Technology (NIST) in Support of the Vitamin D Initiative of the National Institutes of Health, Office of Dietary Supplements.
S. Wise, S. Tai, C. Burdette, Johanna E. Camara +9 more
2017Journal of AOAC International206 citations
Semantic Scholar
Accuracy, Precision, and Reliability of Chemical Measurements in Natural Products Research
J. Betz, P. Brown, M. Roman
2010Fitoterapia182 citations Open access
Semantic Scholar
Effect of Increasing Doses of Saw Palmetto on Lower Urinary Tract Symptoms: A Randomized Trial
M. Barry, S. Meleth, Jeannette Y. Lee, K. Kreder +15 more
2011Journal of the American Medical Association (JAMA)162 citations Open access
Semantic Scholar
Nanotechnology research: applications in nutritional sciences.
P. Srinivas, M. Philbert, T. Vu, Qing-Rong Huang +13 more
2010Journal of NutriLife146 citations Open access
Semantic Scholar
United States Pharmacopeia (USP) comprehensive review of the hepatotoxicity of green tea extracts
H. Oketch-Rabah, A. Roe, C. Rider, H. Bonkovsky +22 more
2020Toxicology Reports139 citations Open access
Semantic Scholar
Development and Certification of a Standard Reference Material for Vitamin D Metabolites in Human Serum
K. Phinney, M. Bedner, S. Tai, Veronica Vamathevan +10 more
2011Analytical Chemistry135 citations Open access
Semantic Scholar
United States Pharmacopeia (USP) Safety Review of Gamma-Aminobutyric Acid (GABA)
H. Oketch-Rabah, Emily F. Madden, A. Roe, J. Betz
2021Nutrients125 citations Open access
Semantic Scholar
Analytical ingredient content and variability of adult multivitamin/mineral products: national estimates for the Dietary Supplement Ingredient Database.
K. Andrews, J. Roseland, P. Gusev, J. Palachuvattil +9 more
2017American Journal of Clinical Nutrition71 citations Open access
Semantic Scholar
Naturally Complex: Perspectives and Challenges Associated with Botanical Dietary Supplement Safety Assessment
K. Shipkowski, J. Betz, L. Birnbaum, J. Bucher +7 more
2018Food and Chemical Toxicology64 citations Open access
Semantic Scholar
Dehydropyrrolizidine Alkaloids, Including Monoesters with an Unusual Esterifying Acid, from Cultivated Crotalaria juncea (Sunn Hemp cv.’Tropic Sun’)
S. Colegate, D. Gardner, R. Joy, J. Betz +1 more
2012Journal of Agricultural and Food Chemistry59 citations Open access
Semantic Scholar
Baseline Assessment of 25-Hydroxyvitamin D Assay Performance: A Vitamin D Standardization Program (VDSP) Interlaboratory Comparison Study.
S. Wise, K. Phinney, S. Tai, Johanna E. Camara +36 more
2017Journal of AOAC International57 citations
Semantic Scholar
General Steps to Standardize the Laboratory Measurement of Serum Total 25-Hydroxyvitamin D.
C. Sempos, J. Betz, Johanna E. Camara, G. Carter +10 more
2017Journal of AOAC International52 citations
Semantic Scholar
Establishing an Accuracy Basis for the Vitamin D External Quality Assessment Scheme (DEQAS).
C. Burdette, Johanna E. Camara, Federica Nalin, J. Pritchett +6 more
2017Journal of AOAC International51 citations
Semantic Scholar
Determination of Major Phenolic Compounds in Echinacea spp. Raw Materials and Finished Products by High-Performance Liquid Chromatography with Ultraviolet Detection: Single-Laboratory Validation Matrix Extension
P. Brown, M. Chan, Lori Paley, J. Betz
2011Journal of AOAC International50 citations Open access
Semantic Scholar
The Challenge of Reproducibility and Accuracy in Nutrition Research: Resources and Pitfalls.
B. Sorkin, Adam J. Kuszak, J. Williamson, D. Hopp +1 more
2016Advances in Nutrition48 citations Open access
Semantic Scholar
Summary of an NIH workshop to identify research needs to improve the monitoring of iodine status in the United States and to inform the DRI.
C. Swanson, Michael B. Zimmermann, S. Skeaff, Elizabeth N. Pearce +16 more
2012Journal of NutriLife45 citations Open access
Semantic Scholar
Development of an Improved Standard Reference Material for Vitamin D Metabolites in Human Serum
K. Phinney, S. Tai, M. Bedner, Johanna E. Camara +16 more
2017Analytical Chemistry39 citations Open access
Semantic Scholar
Dietary Supplement Ingredient Database (DSID) and the Application of Analytically Based Estimates of Ingredient Amount to Intake Calculations.
K. Andrews, P. Gusev, Malikah McNeal, S. Savarala +9 more
2018Journal of NutriLife37 citations Open access
Semantic Scholar
The Dietary Supplement Label Database: Recent Developments and Applications
J. Dwyer, Richard Bailen, L. Saldanha, J. Gahche +18 more
2018Journal of NutriLife29 citations Open access
Semantic Scholar
Development of Standard Reference Material (SRM) 2973 Vitamin D Metabolites in Frozen Human Serum (High Level).
S. Tai, Michael A. Nelson, M. Bedner, Brian E. Lang +6 more
2017Journal of AOAC International29 citations
Semantic Scholar
Optimization and single-laboratory validation study of a high-performance liquid chromatography (HPLC) method for the determination of phenolic Echinacea constituents
P. Brown, M. Chan, J. Betz
2010Analytical and Bioanalytical Chemistry26 citations
Semantic Scholar
Potentially toxic pyrrolizidine alkaloids in Eupatorium perfoliatum and three related species. Implications for herbal use as boneset.
S. Colegate, R. Upton, D. Gardner, K. Panter +1 more
2018Phytochemical Analysis25 citations
Semantic Scholar
Pro-toxic 1,2-Dehydropyrrolizidine Alkaloid Esters, Including Unprecedented 10-Membered Macrocyclic Diesters, in the Medicinally-used Alafia cf. caudata and Amphineurion marginatum (Apocynaceae: Apocynoideae: Nerieae and Apocyneae).
S. Colegate, D. Gardner, J. Betz, O. W. Fischer +2 more
2016Phytochemical Analysis22 citations
Semantic Scholar
Baseline Assessment of 25-Hydroxyvitamin D Reference Material and Proficiency Testing/External Quality Assurance Material Commutability: A Vitamin D Standardization Program Study.
K. Phinney, C. Sempos, S. Tai, Johanna E. Camara +39 more
2017Journal of AOAC International21 citations
Semantic Scholar
The Importance of Method Selection in Determining Product Integrity for Nutrition Research.
E. Mudge, J. Betz, P. Brown
2016Advances in Nutrition21 citations Open access
Semantic Scholar
Disintegration and dissolution testing of green tea dietary supplements: application and evaluation of United States Pharmacopeial standards.
P. Gusev, K. Andrews, S. Savarala, Phuong-Tan Tey +8 more
2020Journal of Pharmacy and Science20 citations Open access
Semantic Scholar
INTERLABORATORY TRIAL FOR MEASUREMENT OF VITAMIN D AND 25(OH)D IN FOODS AND A DIETARY SUPPLEMENT USING LIQUID CHROMATOGRAPHY-MASS SPECTROMETRY
J. Roseland, K. Patterson, K. Andrews, K. Phillips +15 more
2016Journal of Agricultural and Food Chemistry20 citations Open access
Semantic Scholar
Serum unmetabolized folic acid in a nationally representative sample of adults ≥60 years in the United States, 2001–2002
Regan L. Bailey, J. Mills, E. A. Yetley, J. Gahche +6 more
2012Food & Nutrition Research20 citations Open access
Semantic Scholar
Detection of high levels of pyrrolizidine-N-oxides in the endangered plant Cryptantha crassipes (Terlingua Creek cat's-eye) using HPLC-ESI-MS.
M. T. Williams, Bonnie J. Warnock, J. Betz, John J. Beck +4 more
2011Phytochemical Analysis20 citations
Semantic Scholar
Development of botanical and fish oil standard reference materials for fatty acids
M. Schantz, L. Sander, K. Sharpless, S. Wise +3 more
2013Analytical and Bioanalytical Chemistry18 citations
Semantic Scholar
Culinary Spice Plants in Dietary Supplement Products and Tested in Clinical Trials.
L. Saldanha, J. Dwyer, J. Betz
2016Advances in Nutrition17 citations Open access
Semantic Scholar
Semi-automated separation of the epimeric dehydropyrrolizidine alkaloids lycopsamine and intermedine: preparation of their N-oxides and NMR comparison with diastereoisomeric rinderine and echinatine.
S. Colegate, D. Gardner, J. Betz, K. Panter
2014Phytochemical Analysis17 citations
Semantic Scholar
FT-NIR characterization with chemometric analyses to differentiate goldenseal from common adulterants.
Ying Liu, Jamie Finley, J. Betz, P. Brown
2018Fitoterapia16 citations Open access
Semantic Scholar
Feasibility of Including Green Tea Products for an Analytically Verified Dietary Supplement Database
L. Saldanha, J. Dwyer, K. Andrews, J. Betz +4 more
2015Journal of Food Science15 citations Open access
Semantic Scholar
A Free New Dietary Supplement Label Database for Dietitians
J. Dwyer, L. Saldanha, Richard Bailen, Regan L. Bailey +11 more
2014Journal of the Academy of Nutrition and Dietetics15 citations Open access
Semantic Scholar
Profiling of Dehydropyrrolizidine Alkaloids and their N-Oxides in Herbarium-Preserved Specimens of Amsinckia Species Using HPLC-esi(+)MS
S. Colegate, S. L. Welsh, D. Gardner, J. Betz +1 more
2014Journal of Agricultural and Food Chemistry15 citations Open access
Semantic Scholar
Pro-toxic dehydropyrrolizidine alkaloids in the traditional Andean herbal medicine “asmachilca”
S. Colegate, M. Boppré, J. Monzón, J. Betz
2015Journal of Ethnopharmacology14 citations Open access
Semantic Scholar
Dehydropyrrolizidine alkaloids in two Cryptantha species: including two new open chain diesters one of which is amphoteric.
S. Colegate, D. Gardner, T. Z. Davis, J. Betz +1 more
2013Phytochemical Analysis13 citations
Semantic Scholar
Dietary Supplement Laboratory Quality Assurance Program: The First Five Exercises
M. Phillips, C. Rimmer, L. Wood, K. Lippa +4 more
2011Journal of AOAC International13 citations Open access
Semantic Scholar
Challenges in Developing Analytically Validated Laboratory-Derived Dietary Supplement Databases.
J. Betz, C. Rimmer, L. Saldanha, M. Phillips +6 more
2018Journal of NutriLife12 citations Open access
Semantic Scholar
Interlaboratory Analytical Comparison of Fatty Acid Concentrations in Serum or Plasma
M. Schantz, C. Powers, R. Schleicher, J. Betz +1 more
2016Clinica chimica acta; international journal of clinical chemistry10 citations Open access
Semantic Scholar
Standard reference materials for dietary supplement analysis
C. Rimmer, K. Sharpless, S. Wise, J. Betz +1 more
2013Analytical and Bioanalytical Chemistry10 citations
Semantic Scholar
Conversions of β-Carotene as Vitamin A in IU to Vitamin A in RAE.
J. Dwyer, L. Saldanha, Carol J. Haggans, N. Potischman +11 more
2020Journal of NutriLife9 citations Open access
Semantic Scholar
Electrophoretic separation of alginic sodium diester and sodium hexametaphosphate in chondroitin sulfate that interfere with the cetylpyridinium chloride titration assay.
Wei-Guo Zhang, G. Giancaspro, Kristie M. Adams, J. Neal-Kababick +4 more
2014Journal of AOAC International9 citations
Semantic Scholar
Certification of elements in and use of standard reference material 3280 multivitamin/multielement tablets.
G. Turk, K. Sharpless, D. Cleveland, Candice Jongsma +18 more
2013Journal of AOAC International9 citations Open access
Semantic Scholar
Variability in vitamin D content among products for multivitamin and mineral supplements.
K. Andrews, P. Pehrsson, J. Betz
2013JAMA Internal Medicine6 citations
Semantic Scholar
Nanotechnology research: Applications in nutritional sciences (Journal of Nutrition (2010) 140, (119-124))
P. Srinivas, M. Philbert, T. Vu, Qing-Rong Huang +13 more
20105 citations Open access
Semantic Scholar
How Accurate Is the Labeled Content of Prescription Prenatal Multivitamin/mineral (MVM)? -an Analytical Pilot Study for the Dietary Supplement Ingredient Database (DSID) (OR14-08-19).
K. Andrews, P. Gusev, S. Savarala, Phuong-Tan Tey +8 more
2019Current Developments in Nutrition4 citations Open access
Semantic Scholar

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