Marina Escala
Autonomous University of Barcelona
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Publication
Featured researches published by Marina Escala.
Analytical Chemistry | 2009
Marina Escala; Susanne Fietz; Gemma Rueda; Antoni Rosell-Melé
The tetraether index of tetraethers consisting of 86 carbons (TEX(86)) is a novel proxy applied to obtain paleotemperature reconstructions from marine and lacustrine settings. It is usually applied alongside the branched vs isoprenoid tetraether (BIT) index, which provides paleoenvironmental information as well as information on the reliability of TEX(86). Both indices are calculated via the analysis of glycerol dialkyl glycerol tetraethers or GDGTs by means of high-performance liquid chromatography/atmospheric pressure chemical ionization-mass spectrometry (HPLC/APCI-MS). Here we test the performance of alternative methods for sample cleanup and instrumental analysis. In particular, we evaluate using alkaline hydrolysis as an alternative cleanup step to alumina column fractionation and show that the resulting TEX(86) and BIT are statistically equivalent. We also test two different adsorbents in the activated or deactivated state for preparative column fractionation and show that any of them can be used to measure TEX(86) but that a certain discrimination between GDGTs used in the BIT index can occur. Regarding the mass spectrometer design, an ion-trap is shown to be as precise as a quadrupole mass spectrometer for GDGT analysis. Some differences are observed for TEX(86) and especially for BIT values obtained from both MS designs. We provide evidence that the APCI conditions are at least partly responsible for these differences. We recommend caution when comparing BIT values among laboratories as this index seems to be especially sensitive to analytical conditions.
Organic Geochemistry | 2009
Gemma Rueda; Antoni Rosell-Melé; Marina Escala; Richard Gyllencreutz; Jan Backman
Geochemistry Geophysics Geosystems | 2009
Stefan Schouten; Ellen C. Hopmans; Jaap van der Meer; Anchelique Mets; Edouard Bard; Thomas S. Bianchi; Aaron F. Diefendorf; Marina Escala; K. Freeman; Yoshihiro Furukawa; Carme Huguet; Anitra E. Ingalls; Guillemette Ménot-Combes; Alexandra J. Nederbragt; Masahiro Oba; Ann Pearson; Emma J. Pearson; Antoni Rosell-Melé; Philippe Schaeffer; Sunita R. Shah; Timothy M. Shanahan; Richard W. Smith; Rienk H. Smittenberg; Helen M. Talbot; Masao Uchida; Benjamin A. S. Van Mooy; Masanobu Yamamoto; Zhaohui Zhang; Jaap S. Sinninghe Damsté
Organic Geochemistry | 2007
Marina Escala; Antoni Rosell-Melé; Pere Masqué
Global and Planetary Change | 2012
Susanne Fietz; Carme Huguet; James Bendle; Marina Escala; Christopher Gallacher; Robert Jamieson; Alfredo Martinez-Garcia; Erin L. McClymont; Vicky L. Peck; Fredrick G. Prahl; Sergio Rossi; Gemma Rueda; Anna Sanson-Barrera; Antoni Rosell-Melé
Limnology and Oceanography | 2011
Susanne Fietz; Alfredo Martinez-Garcia; Gemma Rueda; Victoria L. Peck; Carme Huguet; Marina Escala; Antoni Rosell-Melé
Meteoritics & Planetary Science | 2008
Marina Escala; Antoni Rosell-Melé; Susanne Fietz; Christian Koeberl
Archive | 2017
Vicky L. Peck; Gemma Rueda; James Bendle; Christopher Gallacher; Robert Jamieson; Susanne Fietz; Carme Huguet; Alfredo Martinez-Garcia; Antoni Rosell-Melé; Fredrick G. Prahl; Erin L. McClymont; Marina Escala; Anna Sanson-Barrera; Sergio Rossi
Archive | 2009
Susanne Fietz; Antoni Rosell-Melé; Marina Escala; Hedi Oberhänsli
Geochemistry Geophysics Geosystems | 2009
Stefan Schouten; Ellen C. Hopmans; Jaap van der Meer; Anchelique Mets; Edouard Bard; Thomas S. Bianchi; Aaron F. Diefendorf; Marina Escala; K. Freeman; Yoshihiro Furukawa; Carme Huguet; Anitra E. Ingalls; Guillemette Ménot-Combes; Alexandra J. Nederbragt; Masahiro Oba; Ann Pearson; Emma J. Pearson; Antoni Rosell-Melé; Philippe Schaeffer; Sunita R. Shah; Timothy M. Shanahan; Richard W. Smith; Rienk H. Smittenberg; Helen M. Talbot; Masao Uchida; Benjamin A. S. Van Mooy; Masanobu Yamamoto; Zhaohui Zhang; Jaap S. Sinninghe Damsté