Michael E Rybak

Summary

Affiliation: Centers for Disease Control and Prevention
Country: USA

Publications

  1. ncbi request reprint Clinical vitamin B6 analysis: an interlaboratory comparison of pyridoxal 5'-phosphate measurements in serum
    Michael E Rybak
    Inorganic Toxicology and Nutrition Branch, Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
    Clin Chem 51:1223-31. 2005
  2. doi request reprint Determination of urine caffeine and its metabolites by use of high-performance liquid chromatography-tandem mass spectrometry: estimating dietary caffeine exposure and metabolic phenotyping in population studies
    Michael E Rybak
    U S Centers for Disease Control and Prevention, National Center for Environmental Health, 4770 Buford Highway, MS F 55, Atlanta, GA, 30341, USA
    Anal Bioanal Chem 406:771-84. 2014
  3. ncbi request reprint Determination of urinary phytoestrogens by HPLC-MS/MS: a comparison of atmospheric pressure chemical ionization (APCI) and electrospray ionization (ESI)
    Michael E Rybak
    Centers for Disease Control and Prevention, National Center for Environmental Health, Atlanta, GA 30341, USA
    J Chromatogr B Analyt Technol Biomed Life Sci 861:145-50. 2008
  4. doi request reprint A simplified protein precipitation and filtration procedure for determining serum vitamin B6 by high-performance liquid chromatography
    Michael E Rybak
    Nutritional Biomarkers Branch, Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
    Anal Biochem 388:175-7. 2009
  5. doi request reprint Sociodemographic and lifestyle variables are compound- and class-specific correlates of urine phytoestrogen concentrations in the U.S. population
    Michael E Rybak
    National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
    J Nutr 143:986S-94S. 2013
  6. doi request reprint The CDC's Second National Report on Biochemical Indicators of Diet and Nutrition in the U.S. Population is a valuable tool for researchers and policy makers
    Christine M Pfeiffer
    National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
    J Nutr 143:938S-47S. 2013
  7. doi request reprint Phytoestrogen biomonitoring: an extractionless LC-MS/MS method for measuring urinary isoflavones and lignans by use of atmospheric pressure photoionization (APPI)
    Daniel L Parker
    U S Centers for Disease Control and Prevention, National Center for Environmental Health, 4770 Buford Hwy, MS F 55, Atlanta, GA 30341, USA
    Anal Bioanal Chem 402:1123-36. 2012
  8. ncbi request reprint Clinical analysis of vitamin B(6): determination of pyridoxal 5'-phosphate and 4-pyridoxic acid in human serum by reversed-phase high-performance liquid chromatography with chlorite postcolumn derivatization
    Michael E Rybak
    Inorganic Toxicology Nutrition Branch, Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341 3724, USA
    Anal Biochem 333:336-44. 2004
  9. doi request reprint Dietary supplement use and smoking are important correlates of biomarkers of water-soluble vitamin status after adjusting for sociodemographic and lifestyle variables in a representative sample of U.S. adults
    Christine M Pfeiffer
    National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
    J Nutr 143:957S-65S. 2013
  10. ncbi request reprint Quantitative determination of allicin in garlic: supercritical fluid extraction and standard addition of alliin
    Michael E Rybak
    United States Department of Agriculture, Agricultural Research Service, Beltsville Human Nutrition Research Center, Beltsville, Maryland 20705, USA
    J Agric Food Chem 52:682-7. 2004

Detail Information

Publications10

  1. ncbi request reprint Clinical vitamin B6 analysis: an interlaboratory comparison of pyridoxal 5'-phosphate measurements in serum
    Michael E Rybak
    Inorganic Toxicology and Nutrition Branch, Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
    Clin Chem 51:1223-31. 2005
    ..Because a true reference method and certified reference materials are lacking, little is known about the relative analytical performance of clinical vitamin B(6) assays...
  2. doi request reprint Determination of urine caffeine and its metabolites by use of high-performance liquid chromatography-tandem mass spectrometry: estimating dietary caffeine exposure and metabolic phenotyping in population studies
    Michael E Rybak
    U S Centers for Disease Control and Prevention, National Center for Environmental Health, 4770 Buford Highway, MS F 55, Atlanta, GA, 30341, USA
    Anal Bioanal Chem 406:771-84. 2014
    ....
  3. ncbi request reprint Determination of urinary phytoestrogens by HPLC-MS/MS: a comparison of atmospheric pressure chemical ionization (APCI) and electrospray ionization (ESI)
    Michael E Rybak
    Centers for Disease Control and Prevention, National Center for Environmental Health, Atlanta, GA 30341, USA
    J Chromatogr B Analyt Technol Biomed Life Sci 861:145-50. 2008
    ..Baring significant factors arising from differences in ionization source design, these observations suggest that ESI is more appropriate for urinary biomonitoring of these compounds by LC-MS/MS...
  4. doi request reprint A simplified protein precipitation and filtration procedure for determining serum vitamin B6 by high-performance liquid chromatography
    Michael E Rybak
    Nutritional Biomarkers Branch, Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
    Anal Biochem 388:175-7. 2009
    ..3 (-2.2, -0.5)% difference in PLP values and a -6.2 (-7.3, -5.2)% difference in 4PA values using the simplified sample preparation. These deviations were found to be well within allowable biases on the basis of biologic variation...
  5. doi request reprint Sociodemographic and lifestyle variables are compound- and class-specific correlates of urine phytoestrogen concentrations in the U.S. population
    Michael E Rybak
    National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
    J Nutr 143:986S-94S. 2013
    ..Overall, we found that relationships between sociodemographic and lifestyle variables and urine phytoestrogen concentration were highly compound and class specific...
  6. doi request reprint The CDC's Second National Report on Biochemical Indicators of Diet and Nutrition in the U.S. Population is a valuable tool for researchers and policy makers
    Christine M Pfeiffer
    National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
    J Nutr 143:938S-47S. 2013
    ..Tabulation and graphical presentation of NHANES data in the Second Nutrition Report benefits those organizations involved in developing and evaluating nutrition policy...
  7. doi request reprint Phytoestrogen biomonitoring: an extractionless LC-MS/MS method for measuring urinary isoflavones and lignans by use of atmospheric pressure photoionization (APPI)
    Daniel L Parker
    U S Centers for Disease Control and Prevention, National Center for Environmental Health, 4770 Buford Hwy, MS F 55, Atlanta, GA 30341, USA
    Anal Bioanal Chem 402:1123-36. 2012
    ..This work is the first ever report of using APPI for the LC-MS/MS determination of these compounds in urine. It is also the first method of its kind to do so without any need for analyte extraction or preconcentration prior to analysis...
  8. ncbi request reprint Clinical analysis of vitamin B(6): determination of pyridoxal 5'-phosphate and 4-pyridoxic acid in human serum by reversed-phase high-performance liquid chromatography with chlorite postcolumn derivatization
    Michael E Rybak
    Inorganic Toxicology Nutrition Branch, Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341 3724, USA
    Anal Biochem 333:336-44. 2004
    ..The high sensitivity, precision, and throughput of this method, combined with its minimal serum specimen (150 microl) and sample injection (10 microl) volume requirements, make it well suited for routine clinical vitamin B(6) analysis...
  9. doi request reprint Dietary supplement use and smoking are important correlates of biomarkers of water-soluble vitamin status after adjusting for sociodemographic and lifestyle variables in a representative sample of U.S. adults
    Christine M Pfeiffer
    National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
    J Nutr 143:957S-65S. 2013
    ..Supplement use and smoking were important correlates of biomarkers of WSV status...
  10. ncbi request reprint Quantitative determination of allicin in garlic: supercritical fluid extraction and standard addition of alliin
    Michael E Rybak
    United States Department of Agriculture, Agricultural Research Service, Beltsville Human Nutrition Research Center, Beltsville, Maryland 20705, USA
    J Agric Food Chem 52:682-7. 2004
    ....