RESUMEN
The topic of incurred sample stability (ISS) has generated considerable discussion within the bioanalytical community in recent years. The subject was an integral part of the seventh annual Workshop on Recent Issues in Bioanalysis (WRIB) held in Long Beach, CA, USA, in April 2013, and at the Global CRO Council for Bioanalysis (GCC) meeting preceding it. Discussion at both events focused on the use of incurred samples for ISS purposes in light of results from a recent GCC survey completed by member companies. This paper reports the consensus resulting from these discussions and serves as a useful reference for depicting ISS issues and concerns, summarizing the GCC survey results and providing helpful recommendations on ISS in the context of bioanalytical method development and application.
Asunto(s)
Pruebas de Química Clínica , Recolección de Datos , Reproducibilidad de los ResultadosRESUMEN
BACKGROUND: It was desired to use contemporary knowledge and technology to develop a highly selective and reliable LC-MS/MS method for teriparatide in human plasma to begin to supplant existing ELISA methodologies. RESULTS: The method was developed using SPE of intact teriparatide and the internal standard rat analogue parathyroid hormone fragment 1-34 from human plasma, and UPLC-MS/MS analysis. Inter- and intra-batch accuracy and precision ranged from 97.5 to 109%, and 1.78 to 12.4%, respectively. Mean analyte extraction recoveries of 80% were attained. CONCLUSION: All relevant acceptance criteria were met in a procedure akin to method validation without the stability aspects, and with a basis of excellent signal stability all performance aspects of the method were unassailable.
Asunto(s)
Cromatografía Liquida/métodos , Extracción en Fase Sólida/métodos , Espectrometría de Masas en Tándem/métodos , Teriparatido/sangre , Humanos , Reproducibilidad de los ResultadosRESUMEN
BACKGROUND: An investigation was carried out into the chromatographic behavior, on a silica hydride-based phase and a comparator silica-based phase, of an important group of lipids endogenous to human plasma, which are associated with matrix effect and in the context of quantitative peptide analysis. RESULTS: The propensity for aqueous normal phase (ANP) retention on the silica hydride-based phase was strong and extensive in comparison with the silica-based comparator, and the lipophilic interferences in question were readily eluted using the ANP mode, a contrast to over-retention issues with accompanying implications for method ruggedness typically found with silica-based phases. CONCLUSION: The silica hydride-based phase, with ANP operation, offered selectivity conducive to rapid lipophilic interferent elimination and the bimodal retention involved in suitable gradient elution was appropriate for general peptide analytical application.
Asunto(s)
Análisis Químico de la Sangre/métodos , Cromatografía Líquida de Alta Presión/métodos , Silicatos/química , Espectrometría de Masas en Tándem/métodos , Humanos , Lípidos/sangreRESUMEN
An open letter written by the Global CRO Council for Bioanalysis (GCC) describing the GCC survey results on stability data from co-administered and co-formulated drugs was sent to multiple regulatory authorities on 14 December 2011. This letter and further discussions at different GCC meetings led to subsequent recommendations on this topic of widespread interest within the bioanalytical community over the past 2 years.
Asunto(s)
Combinación de Medicamentos , Preparaciones Farmacéuticas/análisis , Tecnología Farmacéutica/normas , Biomarcadores/análisis , Cromatografía Líquida de Alta Presión/métodos , Estabilidad de Medicamentos , Regulación Gubernamental , Guías como Asunto , Humanos , Espectrometría de Masas en Tándem/métodosRESUMEN
BACKGROUND: In the context of matrix effects in bioanalytical LC-MS/MS, a speculative link between free cholesterol, the recoveries of the compound from three common extraction procedures, and response enhancement was qualitatively investigated. RESULTS: Injections on-column of cholesterol both in solution and extracts, in conjunction with post-column infusion of three representative drugs, reveal a direct role in pronounced response enhancement for two out of three analytes, under one set of LC-MS/MS conditions, for the majority of typical plasma extraction procedures, where electrospray-based gaseous ion generation is used. CONCLUSION: Cholesterol has been shown to have a strong association with LC-MS/MS response enhancement and ideally should be monitored during method development, reinforcing the reasoning behind minimizing SPE elution volumes and avoiding less selective means of sample preparation.
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Colesterol/análisis , Colesterol/química , Cromatografía Liquida/métodos , Extracción en Fase Sólida/métodos , Espectrometría de Masas en Tándem/métodos , Animales , Ciclohexanoles/sangre , Ciclohexanoles/química , Humanos , Cetoconazol/sangre , Cetoconazol/química , Extracción Líquido-Líquido , Preparaciones Farmacéuticas/sangre , Preparaciones Farmacéuticas/química , Plasma/química , Ratas , Triazoles/sangre , Triazoles/química , Triptaminas/sangre , Triptaminas/química , Clorhidrato de VenlafaxinaRESUMEN
The Global CRO Council for Bioanalysis (GCC) was formed in September 2010. Since then, the representatives of the member companies come together periodically to openly discuss bioanalysis and the regulatory challenges unique to the outsourcing industry. The 4th GCC Closed Forum brought together experts from bioanalytical CROs to share and discuss recent issues in regulated bioanalysis, such as the impact of coadministered drugs on stability, some differences between European Medicines Agency and US FDA bioanalytical guidance documents and lessons learned following recent Untitled Letters. Recent 483s and agency findings, as well as issues on method carryover, were also part of the topics discussed.
Asunto(s)
Técnicas de Química Analítica/normas , Guías como Asunto , Organizaciones sin Fines de Lucro/normas , United States Food and Drug Administration/normas , Métodos Analíticos de la Preparación de la Muestra , Calibración , Química Farmacéutica , Documentación , Combinación de Medicamentos , Estabilidad de Medicamentos , Europa (Continente) , Estándares de Referencia , Reproducibilidad de los Resultados , Estados UnidosRESUMEN
"The Global CRO Council (GCC) for Bioanalysis was formed in an effort to bring together many CRO leaders to openly discuss bioanalysis and the regulatory challenges unique to the outsourcing industry"
Asunto(s)
Biofarmacia/normas , Técnicas de Química Analítica/normas , Estándares de Referencia , Técnicas de Química Analítica/métodos , Estabilidad de Medicamentos , Cooperación Internacional , Control de CalidadRESUMEN
BACKGROUND: The aim was to develop, and establish as suitable to begin assessment by full validation, a quantitative LC-MS/MS method for asparagine in human plasma. Therein, to utilize a stable-labeled analogue of asparagine to act as surrogate analyte, producing complete calibration curves and corresponding QC samples and another m/z distinct stable-labeled analogue to act as internal standard. RESULTS: From two candidates, the surrogate analyte was selected through statistical comparisons of concentration-response data and the resultant method employed protein precipitation and LC on an unmodified silica column with multiple reaction monitoring detection mode. The calibration range was 50-10,000 ng/ml. CONCLUSION: This method was successfully proven to meet the accuracy and precision acceptance criteria of current bioanalytical method validation guidelines.