J. Betz

发表

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, 2014, Journal of agricultural and food chemistry.

Interlaboratory Trial for Measurement of Vitamin D and 25-Hydroxyvitamin D [25(OH)D] in Foods and a Dietary Supplement Using Liquid Chromatography-Mass Spectrometry.

Christine L. Taylor, S. Wise, J. Harnly, 2016, Journal of agricultural and food chemistry.

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.

M. Chan, P. Brown, J. Betz, 2011, Journal of AOAC International.

Optimization and single-laboratory validation study of a high-performance liquid chromatography (HPLC) method for the determination of phenolic Echinacea constituents

M. Chan, P. Brown, J. Betz, 2010, Analytical and bioanalytical chemistry.

Development of an Improved Standard Reference Material for Vitamin D Metabolites in Human Serum.

Johanna E. Camara, C. Sempos, S. Wise, 2017, Analytical chemistry.

Progress in developing analytical and label-based dietary supplement databases at the NIH Office of Dietary Supplements.

J. Milner, J. Dwyer, V. Burt, 2008, Journal of food composition and analysis : an official publication of the United Nations University, International Network of Food Data Systems.

Off-Line Supercritical Fluid Extraction of Thiosulfinates from Garlic and Onion

M. H. Littlejohn, E. M. Calvey, J. Betz, 1994 .

Progress in development of an integrated dietary supplement ingredient database at the NIH Office of Dietary Supplements.

J. Dwyer, J. Harnly, P. Coates, 2006, Journal of food composition and analysis : an official publication of the United Nations University, International Network of Food Data Systems.

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.

A. Carriquiry, J. Dwyer, C. Swanson, 2012, The Journal of nutrition.

Contamination of botanical dietary supplements by Digitalis lanata.

S. Musser, L. Love, J. Betz, 1998, The New England journal of medicine.

Nanotechnology Research : Applications in Nutritional Sciences 1 , 2

J. L. Kokini, J. Milner, J. Dwyer, 2009 .

Certification of standard reference materials containing bitter orange

S. Wise, B. Nelson, L. Sander, 2008, Analytical and bioanalytical chemistry.

Characterization of a suite of ginkgo-containing standard reference materials

M. Rearick, A. Nguyenpho, S. Wise, 2007, Analytical and bioanalytical chemistry.

Development of botanical and fish oil standard reference materials for fatty acids

A. Nguyenpho, S. Wise, L. Sander, 2013, Analytical and Bioanalytical Chemistry.

Chemical Studies of Phytoestrogens and Related Compounds in Dietary Supplements: Flax and Chaparral

S. Musser, J. Betz, A. Pohland, 1995, Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine.

Serum unmetabolized folic acid in a nationally representative sample of adults ≥60 years in the United States, 2001–2002

K. Dodd, C. Sempos, J. Dwyer, 2012, Food & nutrition research.

Development and certification of a standard reference material for vitamin D metabolites in human serum.

S. Wise, L. Sander, P. Coates, 2012, Analytical chemistry.

Baseline Assessment of 25-Hydroxyvitamin D Assay Performance: A Vitamin D Standardization Program (VDSP) Interlaboratory Comparison Study.

Johanna E. Camara, A. Prentice, G. Goldberg, 2017, Journal of AOAC International.

Mission and activities of the NIH Office of Dietary Supplements

J. Dwyer, P. Coates, J. Betz, 2004 .

A free new dietary supplement label database for registered dietitian nutritionists.

J. Milner, J. Dwyer, V. Burt, 2014, Journal of the Academy of Nutrition and Dietetics.

The development and implementation of quality assurance programs to support nutritional measurements

S. Wise, K. Lippa, L. Sander, 2013, Analytical and Bioanalytical Chemistry.

Grape Seed Extract

J. Moss, M. Blackman, G. Cragg, 2014 .

Determination of synephrine in bitter orange raw materials, extracts, and dietary supplements by liquid chromatography with ultraviolet detection: single-laboratory validation.

J. Betz, M. Roman, Jana B Hildreth, 2007, Journal of AOAC International.

Dietary supplement ingredient database (DSID): Preliminary USDA studies on the composition of adult multivitamin/mineral supplements.

J. Dwyer, J. Harnly, J. Holden, 2008, Journal of food composition and analysis : an official publication of the United Nations University, International Network of Food Data Systems.

Analytical ingredient content and variability of adult multivitamin/mineral products: national estimates for the Dietary Supplement Ingredient Database.

L. Douglass, J. Dwyer, S. Savarala, 2017, The American journal of clinical nutrition.

Potentially toxic pyrrolizidine alkaloids in Eupatorium perfoliatum and three related species. Implications for herbal use as boneset.

S. Colegate, D. Gardner, J. Betz, 2018, Phytochemical analysis : PCA.

The caffeine contents of dietary supplements commonly purchased in the US: analysis of 53 products with caffeine-containing ingredients

L. Douglass, J. Dwyer, J. Holden, 2007, Analytical and bioanalytical chemistry.

Conversions of β-Carotene as Vitamin A in IU to Vitamin A in RAE.

J. Dwyer, J. Harnly, S. Savarala, 2020, The Journal of nutrition.

Dietary Supplement Ingredient Database (DSID) and the Application of Analytically Based Estimates of Ingredient Amount to Intake Calculations.

L. Douglass, J. Dwyer, S. Savarala, 2018, The Journal of nutrition.

Disintegration and dissolution testing of green tea dietary supplements: application and evaluation of United States Pharmacopeial standards.

J. Dwyer, S. Savarala, A. Kuszak, 2020, Journal of pharmaceutical sciences.

Value Assignment of Vitamin D Metabolites in Vitamin D Standardization Program Serum Samples.

Johanna E. Camara, B. Toman, C. Sempos, 2017, Journal of AOAC International.

Measuring vitamins and minerals in dietary supplements for nutrition studies in the USA

J. Milner, J. Dwyer, V. Burt, 2007, Analytical and bioanalytical chemistry.

Culinary Spice Plants in Dietary Supplement Products and Tested in Clinical Trials.

J. Dwyer, J. Betz, L. Saldanha, 2016, Advances in nutrition.

Development of saw palmetto (Serenoa repens) fruit and extract standard reference materials

A. Nguyenpho, S. Wise, L. Sander, 2008, Analytical and bioanalytical chemistry.

The NIH analytical methods and reference materials program for dietary supplements

P. Coates, J. Betz, L. Saldanha, 2007, Analytical and bioanalytical chemistry.

Annual Bibliography of Significant Advances in Dietary Supplement Research 1999

R. Rivlin, J. Erdman, L. Rudel, 2022 .

Development of Standard Reference Material (SRM) 2973 Vitamin D Metabolites in Frozen Human Serum (High Level).

C. Sempos, S. Wise, L. Sander, 2017, Journal of AOAC International.

Development of Standard Reference Material (SRM) 2973 Vitamin D Metabolites in Frozen Human Serum (High Level).

C. Sempos, S. Wise, L. Sander, 2017, Journal of AOAC International.

Determination of pyrrolizidine alkaloids in commercial comfrey products (Symphytum sp.).

J. Betz, R. Eppley, D. Andrzejewski, 1994, Journal of pharmaceutical sciences.

United States Pharmacopeia (USP) Safety Review of Gamma-Aminobutyric Acid (GABA)

J. Betz, H. Oketch-Rabah, A. Roe, 2021, Nutrients.

Studies on natural products.

R. Costello, J. Betz, 2006, Archives of internal medicine.

Detection of high levels of pyrrolizidine-N-oxides in the endangered plant Cryptantha crassipes (Terlingua Creek cat's-eye) using HPLC-ESI-MS.

S. Colegate, S. Lee, J. Beck, 2011, Phytochemical analysis : PCA.

Identification of a lycopsamine-N-oxide chemotype of Amsinckia intermedia

S. Colegate, S. L. Welsh, D. Gardner, 2013 .

Dehydropyrrolizidine alkaloids, including monoesters with an unusual esterifying acid, from cultivated Crotalaria juncea (Sunn Hemp cv.'Tropic Sun').

R. Joy, S. Colegate, D. Gardner, 2012, Journal of agricultural and food chemistry.

Gas chromatographic determination of toxic quinolizidine alkaloids in blue cohosh Caulophyllum thalictroides (L.) Michx

J. Betz, T. Woldemariam, R. Casey, 1998 .

Pro-toxic dehydropyrrolizidine alkaloids in the traditional Andean herbal medicine "asmachilca".

S. Colegate, J. Betz, M. Boppré, 2015, Journal of ethnopharmacology.

AOAC SMPR 2016.017.

Richard van Breemen, Joseph M Betz, Lisa Evans, 2017, Journal of AOAC International.

The Challenge of Reproducibility and Accuracy in Nutrition Research: Resources and Pitfalls.

J. S. Williamson, A. Kuszak, J. Betz, 2016, Advances in nutrition.

Accuracy, precision, and reliability of chemical measurements in natural products research.

Joseph M Betz, Paula N Brown, P. Brown, 2011, Fitoterapia.

United States Pharmacopeia (USP) comprehensive review of the hepatotoxicity of green tea extracts

R. Fontana, H. Bonkovsky, J. Serrano, 2020, Toxicology reports.

Effect of storage and extraction on ratio of soyasaponin I to 2,3‐dihydro‐2,5‐dihydroxy‐6‐methyl‐4‐pyrone‐conjugated soyasaponin I in dehulled peas (Pisum sativumL)

P. Åman, S. Musser, J. Betz, 1998 .

The Variation in Content and Changes during Development of Soyasaponin I in Dehulled Swedish Peas (Pisum sativum L)

P. Åman, S. Musser, J. Betz, 1997 .

Analysis of aporphine and quinolizidine alkaloids from Caulophyllum thalictroides by densitometry and HPLC.

J. Betz, T. Woldemariam, P. Houghton, 1997, Journal of pharmaceutical and biomedical analysis.

Dietary supplement use in the United States, 2003-2006.

Joseph M. Betz, Paul R. Thomas, Johanna T. Dwyer, 2011, The Journal of nutrition.

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. Liede‐Schumann, S. Colegate, D. Gardner, 2016, Phytochemical analysis : PCA.

Encyclopedia of Dietary Supplements

J. D. White, J. Moss, M. Blackman, 2010 .

Chiral gas chromatographic determination of ephedrine-type alkaloids in dietary supplements containing Má Huáng.

B. Portz, M. Mossoba, J. Betz, 1997, Journal of AOAC International.

The Importance of Method Selection in Determining Product Integrity for Nutrition Research.

Joseph M Betz, Paula N Brown, Elizabeth M Mudge, 2016, Advances in nutrition.

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 study.

F. Fry, G. Noonan, M. Trucksess, 2008, Journal of AOAC International.

Effect of increasing doses of saw palmetto extract on lower urinary tract symptoms: a randomized trial.

C. Roehrborn, E. Crawford, M. Barry, 2011, JAMA.

Liquid Chromatographic Method for the Determination of Intact, Non-Derivatized Glucosinolates from Brassicaceae

J. Betz, S. Page, 1990 .

Detecting potential teratogenic alkaloids from blue cohosh rhizomes using an in vitro rat embryo culture.

E. Kennelly, J. Betz, T. Flynn, 1999, Journal of natural products.

Determination of ephedrine-type alkaloids in dietary supplements by LC/MS using a stable-isotope labeled internal standard.

S. Musser, J. Betz, K. White, 2001, Journal of AOAC International.

Determination of ethanol in alcoholic beverages by liquid chromatography using the UV detector.

J. Betz, J. Nikelly, 1987, Journal of Chromatographic Science.

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.

Joseph M Betz, Stephen A Wise, Christopher T Sempos, 2017, Journal of AOAC International.

High-Performance Liquid Chromatographic Determination of Glucosinolates inBrassicaVegetables

J. Betz, W. D. Fox, 1993 .

Nanotechnology research: applications in nutritional sciences.

Joseph M Betz, Karl E Friedl, Martin Philbert, 2010, The Journal of nutrition.

Dehydropyrrolizidine alkaloids in two Cryptantha species: including two new open chain diesters one of which is amphoteric.

S. Colegate, D. Gardner, J. Betz, 2013, Phytochemical analysis : PCA.

Semi-automated separation of the epimeric dehydropyrrolizidine alkaloids lycopsamine and intermedine: preparation of their N-oxides and NMR comparison with diastereoisomeric rinderine and echinatine.

Joseph M Betz, S. Colegate, D. Gardner, 2014, Phytochemical analysis : PCA.

Use of multitoxin immunoaffinity columns for determination of aflatoxins and ochratoxin A in ginseng and ginger.

Joseph M Betz, Mary W Trucksess, M. Trucksess, 2007, Journal of AOAC International.

Sampling and analytical variability associated with the determination of total aflatoxins and ochratoxin A in powdered ginger sold as a dietary supplement in capsules.

T. Whitaker, M. Trucksess, F. Giesbrecht, 2009, Journal of agricultural and food chemistry.

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 States.

K. Dodd, C. Sempos, J. Dwyer, 2010, The American journal of clinical nutrition.

Interlaboratory analytical comparison of fatty acid concentrations in serum or plasma.

S. Wise, R. Schleicher, M. Schantz, 2016, Clinica chimica acta; international journal of clinical chemistry.

Approaches by the US National Institutes of Health to support rigorous scientific research on dietary supplements and natural products.

J. S. Williamson, A. Kuszak, J. Betz, 2016, Drug testing and analysis.

Black cohosh: Considerations of safety and benefit

Joseph M. Betz, Mark Avigan, Edward J. Kennelly, 2009 .

Application of gas chromatography/matrix isolation/Fourier transform Infrared spectroscopy to the identification of pyrrolizidine alkaloids from comfrey root (Symphytum officinale L.)

M. Mossoba, M. Trucksess, J. Betz, 1994 .

Drug interactions with herbal products and grapefruit juice: A conference report

P. Watkins, Shiew-Mei Huang, G. Kearns, 2004, Clinical pharmacology and therapeutics.

Naturally complex: Perspectives and challenges associated with Botanical Dietary Supplement Safety assessment.

J. Bucher, L. Birnbaum, N. Walker, 2018, Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association.

Challenges in Developing Analytically Validated Laboratory-Derived Dietary Supplement Databases.

Adam Kuszak, Stephen A. Wise, Joseph M. Betz, 2018, The Journal of nutrition.

Standard reference materials for dietary supplement analysis

Catherine A. Rimmer, Katherine E. Sharpless, Stephen A. Wise, 2013, Analytical and Bioanalytical Chemistry.

Establishing an Accuracy Basis for the Vitamin D External Quality Assessment Scheme (DEQAS).

Joseph M Betz, Stephen A Wise, Christopher T Sempos, 2017, Journal of AOAC International.

Baseline Assessment of 25-Hydroxyvitamin D Reference Material and Proficiency Testing/External Quality Assurance Material Commutability: A Vitamin D Standardization Program Study.

Joseph M Betz, W Greg Miller, Kurtis Sarafin, 2017, Journal of AOAC International.

General Steps to Standardize the Laboratory Measurement of Serum Total 25-Hydroxyvitamin D.

Joseph M Betz, Andy Liu, Kurtis Sarafin, 2017, Journal of AOAC International.

Effect of Storage and Extraction on Ratio of So y asaponin to 2 , 3-Dih y dro-2 , 5-dih y drox y-6-I meth y l-4p y rone-Conjugated

Per, S. Musser, J. Betz, 1998 .

Gas chromatographic determination of yohimbine in commercial yohimbe products.

J. Betz, K. White, A. Der Marderosian, 1995, Journal of AOAC International.

The Dietary Supplement Label Database: Recent Developments and Applications.

Joseph M Betz, Nancy Potischman, Richard A Bailen, 2018, The Journal of nutrition.

Plant toxins.

J. Betz, 1999, Journal of AOAC International.

Grape seed extract

J. D. White, J. Moss, M. Blackman, 2023, Reactions Weekly.

Evaluation of commercial kava extracts and kavalactone standards for mutagenicity and toxicity using the mammalian cell gene mutation assay in L5178Y mouse lymphoma cells.

V. Dunkel, L. D. de Jager, P. Whittaker, 2008, Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association.

Dietary supplement laboratory quality assurance program: the first five exercises.

K. Lippa, L. Sander, D. Duewer, 2011, Journal of AOAC International.

Electrophoretic separation of alginic sodium diester and sodium hexametaphosphate in chondroitin sulfate that interfere with the cetylpyridinium chloride titration assay.

Kristie M. Adams, J. Betz, Z. Weiguo, 2014, Journal of AOAC International.

Considerations of Safety and Benefit

Joseph M. Betz, Mark Avigan, Joanne Barnes, 2010 .

Safety and Benefit of Black Cohosh Issues for the 2010 Dietary Guidelines

J. Senior, E. Kennelly, M. Avigan, 2009 .

Toward FAIRness and a User-Friendly Repository for Supporting NMR Data.

J. Betz, B. Sorkin, D. C. Hopp, 2020, The Journal of organic chemistry.

Feasibility of including green tea products for an analytically verified dietary supplement database.

J. Dwyer, J. Harnly, S. Savarala, 2015, Journal of Food Science.