2026-04-17T13:53:53Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/58262023-06-08T12:49:03Zcom_10259_5827com_10259_5086com_10259_2604com_10259_5495com_10259_3844com_10259_3596com_10259_4249col_10259_5828col_10259_5496col_10259_3845col_10259_3597col_10259_4250

Phyllosilicate-content influence on the spectroscopic properties and antioxidant capacity of Iberian Cretaceous clays García Tojal, Javier Iriarte Avilés, Eneko Palmero Díaz, Susana Pedrosa Sáez, María de los Remedios Rad Moradillo, Juan Carlos Sanllorente Méndez, Silvia Zuluaga, María Cruz Cavia Saiz, Mónica Rivero Pérez, Maria Dolores Muñiz Rodríguez, Pilar Clay minerals Electron paramagnetic resonance Infrared spectroscopy Infrared spectroscopy X-ray diffraction Antioxidant capacity Kaolinite-rich Cretaceous clay sediment samples from Burgos (Spain) have been analyzed by elemental analysis, X-ray fluorescence, inductively coupled plasma mass spectrometry, X-ray diffraction and different spectroscopic techniques, as Fourier Transform Infrared, ultraviolet–visible and electron paramagnetic resonance. The clay sediment samples mainly contain quartz, muscovite and kaolinite. Different radicals, as A- and B-Centers in kaolinite and organic paramagnetic species, are detected. An illite/kaolinite FTIR band ratio parameter (IKB) is proposed to infer the illite/kaolinite proportion, which can be useful to graphically visualize the iron-substituted Al(III) sites. Studies of the activity as scavengers of DPPH and ABTS radicals show that samples with a larger amount of orthorhombic Fe(III) ions replacing Al(III) ions exhibit a higher antioxidant capacity. 2021-07-06T10:56:01Z 2021-07-06T10:56:01Z 2021-07-06T10:56:01Z 2021-04 info:eu-repo/semantics/article 1386-1425 http://hdl.handle.net/10259/5826 10.1016/j.saa.2021.119472 eng Molecular and Biomolecular Spectroscopy. 2021, V. 251, 119472 https://doi.org/10.1016/j.saa.2021.119472 info:eu-repo/grantAgreement/JCyL/BU022G18 info:eu-repo/grantAgreement/JCyL/BU291P18 info:eu-repo/grantAgreement/JCyL/BU049P20 info:eu-repo/grantAgreement/MICINN/CTQ(QMC) RED2018-102471-T info:eu-repo/grantAgreement/MINECO/CTQ2016-75023-C2-1-P http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier