Dean Gray

Summary

Affiliation: Midwest Research Institute
Country: USA

Publications

  1. ncbi request reprint Acute drought stress and plant age effects on alkamide and phenolic acid content in purple coneflower roots
    Dean E Gray
    Life Sciences Division, Agricultural Sciences, Midwest Research Institute, Kansas City, Missouri 64110, USA
    Planta Med 69:50-5. 2003
  2. pmc Evaluation of a method to determine flavonol aglycones in Ginkgo biloba dietary supplement crude materials and finished products by high-performance liquid chromatography: collaborative study
    Dean Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110 2299, USA
    J AOAC Int 90:43-53. 2007
  3. ncbi request reprint Simultaneous quantification of terpenelactones and flavonol aglycones in hydrolyzed ginkgo biloba extract by liquid chromatography with inline ultraviolet and evaporative light scattering detection
    Dean E Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110 2299, USA
    J AOAC Int 88:1613-20. 2005
  4. ncbi request reprint Quantitative analysis of flavonol glycosides in Ginkgo biloba: a comparison of two analytical methods
    D E Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110, USA
    Phytochem Anal 17:56-62. 2006
  5. pmc Determination of flavonol aglycones in Ginkgo biloba dietary supplement crude materials and finished products by high-performance liquid chromatography: single laboratory validation
    Dean Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110 2299, USA
    J AOAC Int 88:692-702. 2005
  6. ncbi request reprint A rapid cleanup method for the isolation and concentration of pyrrolizidine alkaloids in comfrey root
    Dean E Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110 2299, USA
    J AOAC Int 87:1049-57. 2004
  7. ncbi request reprint Effect of acute drought stress and time of harvest on phytochemistry and dry weight of St. John's wort leaves and flowers
    Dean E Gray
    Midwest Research Institute, Kansas City, Missouri 64110, USA
    Planta Med 69:1024-30. 2003
  8. ncbi request reprint Analysis of flavonol aglycones and terpenelactones in Ginkgo biloba extract: A comparison of high-performance thin-layer chromatography and column high-performance liquid chromatography
    Dean E Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110, USA
    J AOAC Int 90:1203-9. 2007
  9. pmc Streamlining plant sample preparation: the use of high-throughput robotics to process echinacea samples for biomarker profiling by MALDI-TOF mass spectrometry
    Leasa A Greene
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110, USA
    J Biomol Tech 18:238-44. 2007
  10. ncbi request reprint Echinacea alkylamides inhibit interleukin-2 production by Jurkat T cells
    Masa Sasagawa
    Bastyr University, Department of Basic Sciences, School of Natural Health Sciences, Kenmore, WA 98028, USA
    Int Immunopharmacol 6:1214-21. 2006

Collaborators

Detail Information

Publications10

  1. ncbi request reprint Acute drought stress and plant age effects on alkamide and phenolic acid content in purple coneflower roots
    Dean E Gray
    Life Sciences Division, Agricultural Sciences, Midwest Research Institute, Kansas City, Missouri 64110, USA
    Planta Med 69:50-5. 2003
    ..The results suggest that controlled drought stress can stimulate increased root dry weight and root cichoric acid content, and that root age is the predominant factor determining overall phytochemical content variation...
  2. pmc Evaluation of a method to determine flavonol aglycones in Ginkgo biloba dietary supplement crude materials and finished products by high-performance liquid chromatography: collaborative study
    Dean Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110 2299, USA
    J AOAC Int 90:43-53. 2007
    ....
  3. ncbi request reprint Simultaneous quantification of terpenelactones and flavonol aglycones in hydrolyzed ginkgo biloba extract by liquid chromatography with inline ultraviolet and evaporative light scattering detection
    Dean E Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110 2299, USA
    J AOAC Int 88:1613-20. 2005
    ..This improved method allows for the first time high throughput sample preparation coupled with the quantification of the predominant compounds generally used for quality control of GBE in a single assay...
  4. ncbi request reprint Quantitative analysis of flavonol glycosides in Ginkgo biloba: a comparison of two analytical methods
    D E Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110, USA
    Phytochem Anal 17:56-62. 2006
    ..The AHP adopted the method of NSF-INA for inclusion in the AHP monograph owing to observed superiority of this method in terms of precision, glycoside calculation, ease of sample preparation and chromatographic parameters...
  5. pmc Determination of flavonol aglycones in Ginkgo biloba dietary supplement crude materials and finished products by high-performance liquid chromatography: single laboratory validation
    Dean Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110 2299, USA
    J AOAC Int 88:692-702. 2005
    ..HorRat scores were within the limits for performance acceptability, ranging from 0.4 to 1.3. Based on the performance results presented herein, it is recommended that this method progress to the collaborative laboratory trial...
  6. ncbi request reprint A rapid cleanup method for the isolation and concentration of pyrrolizidine alkaloids in comfrey root
    Dean E Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110 2299, USA
    J AOAC Int 87:1049-57. 2004
    ..The unique properties of the Ergosil cleanup column provide rapid sample cleanup, volume reduction, and concentration of PAs from comfrey extracts, and allow the eluant to be analyzed directly by traditional chromatographic methods...
  7. ncbi request reprint Effect of acute drought stress and time of harvest on phytochemistry and dry weight of St. John's wort leaves and flowers
    Dean E Gray
    Midwest Research Institute, Kansas City, Missouri 64110, USA
    Planta Med 69:1024-30. 2003
    ..perforatum...
  8. ncbi request reprint Analysis of flavonol aglycones and terpenelactones in Ginkgo biloba extract: A comparison of high-performance thin-layer chromatography and column high-performance liquid chromatography
    Dean E Gray
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110, USA
    J AOAC Int 90:1203-9. 2007
    ..4). It is demonstrated that HPTLC can be a time-saving complement to HPLC for routine analysis of the flavonol glycosides in GBE...
  9. pmc Streamlining plant sample preparation: the use of high-throughput robotics to process echinacea samples for biomarker profiling by MALDI-TOF mass spectrometry
    Leasa A Greene
    Midwest Research Institute, 425 Volker Blvd, Kansas City, MO 64110, USA
    J Biomol Tech 18:238-44. 2007
    ..These results highlight the potential for streamlined, automated approaches for agricultural species differentiation and botanical product evaluation...
  10. ncbi request reprint Echinacea alkylamides inhibit interleukin-2 production by Jurkat T cells
    Masa Sasagawa
    Bastyr University, Department of Basic Sciences, School of Natural Health Sciences, Kenmore, WA 98028, USA
    Int Immunopharmacol 6:1214-21. 2006
    ..Thus, alkylamides present in E. purpurea suppress the ability of activated Jurkat T cells to produce IL-2 independently of direct, cytotoxic effects...