- About
- Research
- Scientific Services
- Research Laboratories
- Antioxidants
- Body Composition
- Bone Metabolism
- Carotenoids & Health
- Cardiovascular Nutrition
- Dietary Assessment
- Energy Metabolism
- Epidemiology
- Lipid Metabolism
- Mineral Bioavailability
- Nutrition & Cancer Biology
- Nutrition, Exercise, Physiology & Sarcopenia (NEPS)
- Nutritional Genomics
- Nutritional Immunology
- Neuroscience
- Nutrition and Neurocognition
- Nutrition & Vision Research
- Obesity Metabolism
- Vascular Biology
- Vitamins & Carcinogenesis
- Vitamin K
- Vitamin Metabolism
- People
- Scientists
- A-J
- Bela F. Asztalos, Ph.D.
- Lynne M. Ausman, D.Sc., R.D.
- Jeffrey B. Blumberg, Ph.D.
- Sarah L. Booth, Ph.D.
- Chung-Yen (Oliver) Chen, Ph.D.
- Chung-Jung Chiu, DDS, Ph.D.
- Sang-Woon Choi, M.D., Ph.D.
- Natalia A. Crivello, Ph.D.
- Jimmy Crott, Ph.D.
- Gerard E. Dallal, Ph.D.
- Sai K. Das, Ph.D.
- Bess Dawson-Hughes, M.D.
- Marion Dietrich, Ph.D.
- Gregory G. Dolnikowski, Ph.D.
- Johanna T. Dwyer, D.Sc., R.D.
- Roger A. Fielding, Ph.D.
- Andrew S. Greenberg, M.D.
- Susan Harris, D.Sc.
- Tina L. Huang, Ph.D.
- Paul F. Jacques, D.Sc.
- Elizabeth J. Johnson, Ph.D.
- James Joseph, Ph.D.
- K-P
- Joseph J. Kehayias, Ph.D.
- Norman I. Krinsky, Ph.D.
- Chao-Qiang Lai,Ph.D.
- Stefania Lamon-Fava, M.D., Ph.D.
- Alice H. Lichtenstein, D.Sc.
- Fuzhi Lian, Ph.D.
- Chun Liu, M.D., M.S./M.P.H.
- Zhenhua Liu, Ph.D.
- Joel B. Mason, M.D.
- Nirupa Matthan, Ph.D.
- Diane L. McKay, Ph.D.
- Nicola McKeown, Ph.D.
- Mohsen Meydani, D.V.M., Ph.D.
- Simin Nikbin Meydani, D.V.M., Ph.D.
- Paul E. Milbury, Ph.D., CFII
- Martha Morris, Ph.D.
- Martin S. Obin, Ph.D.
- Jose M. Ordovas, Ph.D.
- Laurence D. Parnell, Ph.D.
- Ligi Paul Pottenplackel, PhD
- Q-Z
- Judy D. Ribaya-Mercado, Sc.D.
- Susan B. Roberts, Ph.D.
- Irwin H. Rosenberg, M.D.
- Robert M. Russell, M.D.
- Edward Saltzman, M.D.
- Ernst J. Schaefer, M.D.
- Jacob Selhub, Ph.D.
- Fu Shang, Ph.D.
- Barbara Shukitt-Hale, Ph.D.
- Donald E. Smith, Ph.D., CMAR
- Katherine Strissel, Ph.D
- Guangwen Tang, Ph.D.
- Allen Taylor, Ph.D.
- Aron Troen, D. Phil.
- Katherine L. Tucker, Ph.D.
- Xiang-Dong Wang, M.D., Ph.D.
- Elizabeth Whitcomb, Ph.D.
- Richard J. Wood, Ph.D.
- Dayong Wu, M.D., Ph.D.
- Qing-Wu Yan, Ph.D.
- Su-Ping Yang
- Kyung-Jin Yeum, Ph.D.
- A-J
- Visiting Scientists
- Postdoctoral Associates
- Bradley Bolling, Ph.D.
- Lisa Ceglia, M.D.
- Angela Chale-Rush, R.D., Ph.D.
- Aurelie Chanson, Ph.D.
- Silvina Choumenkovitch, Ph.D.
- Alice Dillard Hirschel, Ph.D.
- Edward Dudek, Ph.D.
- Xueyan Fu, Ph.D.
- Weimin Guo, Ph.D.
- Wangwang Jiao, Ph.D.
- Yunkyoung Lee, Ph.D.
- Denish Moorthy, M.B.B.S., M.S.
- James Perfield, Ph.D.
- Zhihong Ren, Ph.D.
- Kyla Shea, Ph.D.
- Jian Shen, Ph.D.
- Caren E. Smith, M.S., D.V.M
- Sameera Talegawkar, Ph.D.
- Tomoaki Uchiki, Ph.D.
- Thomas van Himbergen, Ph.D.
- Scientists
- Volunteer
- Current Studies
- 2347: Glycemic Index - Variability Among Individuals
- 2445: Vitamin K Absorption
- 2450: Vitamin D and Muscle Strength
- 2520: Comprehensive Assessment of Long-term Effects of Reducing Intake of Energy (CALERIE)
- 2555: Whey Protein Supplementation and Resistance Exercise Study
- 2585: Vitamin D and Blood Sugar Control
- Request Information
- Frequently Asked Questions
- Current Studies
- Publications
- Events
- Partnering
Mass Spectrometry
The Mass Spectrometry Unit consists of four gas chromatography-mass spectrometers (GC/MS); four liquid chromatography-mass spectrometer (LC/MS); and an isotope ratio mass spectrometer (IRMS). The GC/MS and LC/MS instruments are used for quantification and identification of vitamins, amino acids, nucleic acids, lipids, fatty acids, retinoids, carotenoids, peptides, and proteins from food and human body fluids. The IRMS is used for measuring doubly labeled water in body fluids and carbon dioxide in breath. Data generated by these instruments are used in human nutrition and exercise studies to determine total energy expenditure, total body water, whole-body protein turnover, vitamin metabolism and bioavailability, DNA methylation and apolipoprotein kinetics.
Mass Spectrometry Staff
Gregory G. Dolnikowski, Ph.D.
Laboratory Director/Scientist II
Provides managerial and scientific direction to the laboratory. Advises scientific personnel on the use of isotope ratio mass spectrometry and gas chromotography/mass spectrometry methods in research protocols.
