Iván Álvarez-Freire

Solid-phase microextraction for the determination of cocaine and cocaethylene in human hair by gas chromatography–mass spectrometry

Ana María Bermejo, Patricia López, Iván Álvarez-Freire et al. · Forensic Science International · 2005 · 62 citations

Gas Chromatography–mass Spectrometry, Gas Chromatography, Medicine +13

Determination of cocaine and cocaethylene in plasma by solid-phase microextraction and gas chromatography–mass spectrometry

Iván Álvarez-Freire, Ana María Bermejo, María Jesús Tabernero et al. · Journal of Chromatography B · 2006 · 58 citations

Gas Chromatography–mass Spectrometry, Gas Chromatography, Medicine +11

Determination of fentanyl, metabolite and analogs in urine by GC/MS

Sabina Strano Rossi, Iván Álvarez-Freire, María Jesús Tabernero et al. · Journal of Applied Toxicology · 2010 · 46 citations · Full text

Microwave-assisted extraction: a simpler and faster method for the determination of ethyl glucuronide in hair by gas chromatography–mass spectrometry

Iván Álvarez-Freire, Ana María Bermejo, María Jesús Tabernero et al. · Analytical and Bioanalytical Chemistry · 2008 · 41 citations

Food Chemistry, Gas Chromatography–mass Spectrometry, Gas Chromatography +7

Matrix solid-phase dispersion on column clean-up/pre-concentration as a novel approach for fast isolation of abuse drugs from human hair

Martha Míguez-Framil, Antonio Moreda–Piñeiro, Pilar Bermejo–Barrera et al. · Journal of Chromatography A · 2010 · 36 citations

Engineering, Separation Science, Medicine +13