Method comparison of a 25-hydroxy vitamin D enzyme immunoassay to liquid chromatography tandem mass spectroscopy

2012 ◽  
Vol 50 (6) ◽  
Author(s):  
James M. Kelley ◽  
Stacy E.F. Melanson ◽  
Marion L. Snyder ◽  
Serge Cremers ◽  
Petr Jarolim
Keyword(s):  
Vitamin D ◽  
Liquid Chromatography ◽  
Enzyme Immunoassay ◽  
Mass Spectroscopy ◽  
Method Comparison ◽  
Tandem Mass ◽  
Liquid Chromatography Tandem Mass ◽  
25 Hydroxy Vitamin D ◽  
Tandem Mass Spectroscopy

scholarly journals Enzyme Immunoassays May Be Inaccurate: Familiar Correlates of Male Testosterone (T) Replicate in Britons when T is Measured by Mass Spectrometry but Do Not Replicate in Americans When T is Measured by Enzyme Immunoassay

2018 ◽  
Author(s):  
Allan Mazur ◽  
Soazig Clifton
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Enzyme Immunoassay ◽  
Mass Spectroscopy ◽  
Older Men ◽  
Tandem Mass ◽  
Enzyme Immunoassays ◽  
Liquid Chromatography Tandem Mass ◽  
Tandem Mass Spectroscopy

ABSTRACTSeveral correlations have been reported between men’s testosterone (T) and other characteristics, e.g., T declines during the day, declines with obesity, and declines with advancing age. We asked if these relationships hold in older men when T is assayed from saliva. Here seven familiar correlations are tested among older American men, their salivary T measured by enzyme immunoassay (EIA). Some correlations can also be tested among older British men, their salivary T assayed by liquid chromatography-tandem mass spectroscopy (LC-MS/MS), a technique noted for its specificity. Most of our attempts at replication failed in the American data but succeeded in the British data. We conclude that failure to replicate in Americans is likely due to inaccuracy of EIA values for T, and that most T correlations hold true in older men when salivary T is accurately measured by LC-MS/MS.

Current Trends of Liquid Chromatography Tandem Mass Spectroscopy Use in Clinical Gynecology

2019 ◽  
Vol 70 (6) ◽  
pp. 2021-2025
Author(s):  
Aida Petca ◽  
Dan Cristian Radu ◽  
Razvan Cosmin Petca ◽  
Claudia Mehedintu ◽  
Ramona Ileana Barac ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Mass Spectroscopy ◽  
Tandem Mass ◽  
Quality Healthcare ◽  
Current Trends ◽  
Healthcare It ◽  
Liquid Chromatography Tandem Mass ◽  
Tandem Mass Spectroscopy ◽  
Technical Innovations ◽  
Hormonal Milieu

In the present environment of staggering technical innovations and increasing expectations of quality healthcare it is evident that we need to fine tune our diagnostic abilities in order to fulfil patients� demands for more efficient therapies and augmented quality of life. We are looking for current trends in clinical gynecology that make use of Liquid chromatography tandem mass spectroscopy, technology not yet employed in Romanian laboratories for the clinical practice but that is rapidly becoming the worldwide method of choice for accurate characterization of the hormonal milieu essential for the requirements of women healthcare.

IDENTIFICATION OF OLIGOSTILBENES FROM Dipterocarpus semivestitus THROUGH DEREPLICATION TECHNIQUE

2015 ◽  
Vol 77 (2) ◽  
Author(s):  
Rohaity Ramli ◽  
Nor Hadiani Ismail ◽  
Nurhuda Manshoor
Keyword(s):  
Liquid Chromatography ◽  
Mass Spectroscopy ◽  
Published Data ◽  
Tandem Mass ◽  
Separation Techniques ◽  
Mass Fragmentation ◽  
Liquid Chromatography Tandem Mass ◽  
Tandem Mass Spectroscopy ◽  
Fragmentation Patterns

Three oligostilbenes have been identified in stems extract of Dipterocarpus semivestitus through dereplication strategy. The stems extract was injected to liquid chromatography tandem mass spectroscopy. Two tetramer, hopeaphenol and hemsleyanol D, were identified by comparing their mass fragmentation patterns with in-house library. A trimer, a-viniferin was isolated by various separation techniques and its structure was confirmed by NMR analyses and comparison with published data.

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