Consulta: subjectFacets:"Tandem mass spectrometry"
Registros recuperados: 3
Data/hora: 09/06/2024 10:36:05

Actiflagelin, a new sperm activator isolated from Walterinnesia aegyptia venom using phenotypic screening
Provedor de dados: 80
Autores: El-Aziz,Tarek Mohamed Abd; Khoury,Sawsan Al; Jaquillard,Lucie; Triquigneaux,Mathilde; Martinez,Guillaume; Bourgoin-Voillard,Sandrine; Sève,Michel; Arnoult,Christophe; Beroud,Rémy; Waard,Michel De.
Abstract  Background Sperm contains a wealth of cell surface receptors and ion channels that are required for most of its basic functions such as motility and acrosome reaction. Conversely, animal venoms are enriched in bioactive compounds that primarily target those ion channels and cell surface receptors. We hypothesized, therefore, that animal venoms should be rich enough in sperm-modulating compounds for a drug discovery program. Our objective was to demonstrate this fact by using a sperm-based phenotypic screening to identify positive modulators from the venom of Walterinnesia aegyptia.  Methods Herein, as proof of concept that venoms contain interesting compounds for sperm physiology, we fractionated Walterinnesia aegyptia snake venom by RP-HPLC and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Snake venom; Walterinnesia aegyptia; Bioactive compounds; Fertility; Sperm motility; Venomics; Tandem mass spectrometry; De novo sequencing; Edman degradation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992018000100301

Plasma free and total carnitine measured in children by tandem mass spectrometry
Provedor de dados: 56
Autores: Osorio,J.H.; Pourfarzam,M.
Free and total carnitine quantification is important as a complementary test for the diagnosis of unusual metabolic diseases, including fatty acid degradation disorders. The present study reports a new method for the quantification of free and total carnitine in dried plasma specimens by isotope dilution electrospray tandem mass spectrometry with sample derivatization. Carnitine is determined by looking for the precursor of ions of m/z = 103 of N-butylester derivative, and the method is validated by comparison with radioenzymatic assay. We obtained an inter- and intra-day assay coefficient of variation of 4.3 and 2.3, respectively. Free and total carnitine was analyzed in 309 dried plasma spot samples from children ranging in age from newborn to 14 years...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carnitine; Tandem mass spectrometry.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001100003

Diagnostic accuracy of thromboelastometry and its correlation with the HPLC-MS/MS quantification test
Provedor de dados: 56
Autores: Aranda,V.F. de; Derogis,P.B.M.; Sanches,L.R.; Mangueira,C.L.P.; Katz,M.; Faulhaber,A.C.L.; Mendes,C.E.A.; Ferreira,C.E. dos Santos; França,C.N.; Guerra,J.C. de Campos.
The aim of the study was to evaluate the diagnostic accuracy of thromboelastometry for assessing rivaroxaban concentrations. The accuracy of thromboelastometry was compared with the high-performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS) method, which is the gold standard for drug plasma monitoring (the reference standard). Forty-six clinically stable patients were treated with 10, 15, or 20 mg of rivaroxaban once daily (OD group) or 15 mg twice a day (BID group) (no particular indication for treatment). Patient samples were collected 2 h after the use of the medication (peak) and 2 h before the next dose (trough). The rivaroxaban plasma concentrations were determined via HPLC-MS/MS, and thromboelastometry was performed using a ROTEM®...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anticoagulants; Blood coagulation; Plasma concentration; Rivaroxaban; Tandem mass spectrometry; Thromboelastometry.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000400603