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You searched for: Author "William Craig Byrdwell" Remove constraint Author: "William Craig Byrdwell"
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1. Three-dimensional liquid chromatography with parallel second dimensions and quadruple parallel mass spectrometry for adult/infant formula analysis

Author:
William Craig Byrdwell,   et al.   ; Hari K. Kotapati; Robert Goldschmidt; Pavel Jakubec; Lucie Nováková;     Show all 5 Authors
Source:
Journal of chromatography 2022 v.1661 pp. 462682
ISSN:
0021-9673
Subject:
adults; aerosols; atmospheric pressure; electrospray ionization mass spectrometry; fluorescence; infant formulas; lipidomics
Abstract:
... Three dimensions of chromatographic separation, using split-flow two-dimensional liquid chromatography (SF-2D-LC) with two parallel second dimensions, LC × 2LC, combined with quadruple parallel mass spectrometry (LC3MS4) is demonstrated for analysis of NIST SRM 1849a adult/infant formula. The first dimension, ¹D, was a conventional non-aqueous reversed-phase (NARP) HPLC separation using two C18 co ...
DOI:
10.1016/j.chroma.2021.462682

2. A note on the use of workstation software programs for quantification

Author:
William Craig Byrdwell
Source:
Journal of Liquid Chromatography & Related Technologies 2019 v.42 no.17-18 pp. 570-574
ISSN:
1082-6076
Subject:
computer software; liquid chromatography; mass spectrometry
Abstract:
... Most chromatographic and mass spectrometric instruments include workstations that allow data processing and target compound quantification. However, the software used for quantification does not all use common approaches for statistical treatment of data. Presented here is a brief description of three commonly used workstation software packages (WSPs) and the degree to which they obey widely accep ...
Handle:
10113/7345038
DOI:
10.1080/10826076.2019.1637350
CHORUS:
10.1080/10826076.2019.1637350

3. The The Updated Bottom Up Solution applied to mass spectrometry of soybean oil in a dietary supplement gelcap

Author:
William Craig Byrdwell
Source:
Analytical and bioanalytical chemistry 2015 v.407 no.17 pp. 5143-5160
ISSN:
1618-2642
Subject:
abscisic acid; atmospheric pressure; bacterial artificial chromosomes; cholecalciferol; data collection; dietary fat; dietary supplements; ionization; ions; mass spectrometry; models; soybean oil; triacylglycerols
Abstract:
... Among the goals of lipidomics applied to triacylglycerols (TAGs) is identification of molecular species, degree and location of unsaturation, and positions of fatty acyl chains (i.e., identification of regioisomers). Toward those ends, we define one, two, and three “Critical Ratios” for Types I, II, and III TAGs that provided different aspects of the desired information. Critical Ratio 1, [MH]⁺/Σ[ ...
Handle:
10113/61936
DOI:
10.1007/s00216-015-8590-9

4. Construction of a Wireless Communication Contact Closure System for Liquid Chromatography with Multiple Parallel Mass Spectrometers and Other Detectors

Author:
William Craig Byrdwell
Source:
Journal of laboratory automation 2014 v.19 no.5 pp. 461-467
ISSN:
2211-0682
Subject:
aerosols; atmospheric pressure; automation; detectors; electrolytes; ionization; light scattering; liquid chromatography; mass spectrometry; pumps; spectrometers
Abstract:
... A contact closure system was constructed that uses two contact closure sender boards that communicate wirelessly to four contact closure receiver boards to distribute start signals from two or three liquid chromatographs to 14 instruments, pumps, detectors, or other components. Default high, closed low, TTL logic (5-volt) start signals from two autosamplers are converted to simple contacts by powe ...
Handle:
10113/61937
DOI:
10.1177/2211068214543372

5. Quadruple parallel mass spectrometry for analysis of vitamin D and triacylglycerols in a dietary supplement

Author:
William Craig Byrdwell
Source:
Journal of chromatography 2013 v.1320 pp. 48-65
ISSN:
0021-9673
Subject:
aerosols; atmospheric pressure; cholecalciferol; detectors; dietary supplements; electrospray ionization mass spectrometry; ergocalciferol; fatty acid methyl esters; fatty acids; flame ionization; ionization; light scattering; monitoring; olive oil; spectrometers; triacylglycerols
Abstract:
... A “dilute-and-shoot” method for vitamin D and triacylglycerols is demonstrated that employed four mass spectrometers, operating in different ionization modes, for a “quadruple parallel mass spectrometry” analysis, plus three other detectors, for seven detectors overall. Sets of five samples of dietary supplement gelcaps labeled to contain 25.0μg (1000 International Units, IU) vitamin D3 in olive o ...
DOI:
10.1016/j.chroma.2013.10.031

6. “Dilute-and-shoot” triple parallel mass spectrometry method for analysis of vitamin D and triacylglycerols in dietary supplements

Author:
William Craig Byrdwell
Source:
Analytical and bioanalytical chemistry 2011 v.401 no.10 pp. 3317-3334
ISSN:
1618-2642
Subject:
aerosols; atmospheric pressure; chemical analysis; detectors; dietary supplements; electrospray ionization mass spectrometry; fatty acids; glycerol; ionization; light scattering; liquid chromatography; monitoring; polymers; rice bran oil; saponification; spectrometers; triacylglycerols; ultraviolet radiation; vitamin D
Abstract:
... A method is demonstrated for analysis of vitamin D fortified dietary supplements that eliminates virtually all chemical pretreatment prior to analysis, which is referred to as a “dilute-and-shoot” method. Three mass spectrometers, in parallel, plus a UV detector, an evaporative light-scattering detector (ELSD), and a corona charged aerosol detector (CAD) were used to allow a comparison of six dete ...
Handle:
10113/62034
DOI:
10.1007/s00216-011-5406-4

7. Effects of UV-B Radiation Levels on Concentrations of Phytosterols, Ergothioneine, and Polyphenolic Compounds in Mushroom Powders Used As Dietary Supplements

Author:
William Craig Byrdwell,   et al.   ; Yelena Sapozhnikova; Amada Lobato; Bill Romig;     Show all 4 Authors
Source:
Journal of agricultural and food chemistry 2014 v.62 no.14 pp. 3034-3042
ISSN:
0021-8561
Subject:
polyphenols; Agaricus bisporus; Lentinula edodes; flavonoids; dietary supplements; ultraviolet radiation; ergocalciferol; powdered foods; mushrooms; powders; Pleurotus ostreatus; food processing quality; food nutrient losses; lignans; food irradiation; campesterol; antioxidants; oysters; bioactive properties; ergosterol
Abstract:
... Compositional changes of powder dietary supplements made from mushrooms exposed to different levels of UV-B irradiation were evaluated for the bioactive naturally occurring mushroom antioxidant, ergothioneine; other natural polyphenolic compounds, e.g., flavonoids, lignans, etc.; and selected phytosterols. Four types of mushroom powder consisting of white, brown (Agaricus bisporus), oyster (Pleuro ...
Handle:
10113/58831
DOI:
10.1021/jf403852k

8. Dual parallel liquid chromatography with dual mass spectrometry (LC2/MS2) for a total lipid analysis

Author:
William Craig Byrdwell
Source:
Frontiers in Bioscience 2008 v.13 pp. 100-120
ISSN:
1093-9946
Subject:
brain; bream; cattle; electrospray ionization mass spectrometry; fish fillets; lipid composition; lipids; liquid chromatography; monitoring; spectrometers
Abstract:
... Total lipid extracts containing both polar and non-polar lipids were separated using two liquid chromatographic systems joined together using a column switching valve. Detection was accomplished using mass spectrometers attached to each of the two liquid chromatographic systems, for a dual liquid chromatography/dual mass spectrometry (LC2/MS2) arrangement. This experimental approach is demonstrate ...
Handle:
10113/62031
DOI:
10.2741/2663