Sulfur amino acids and alanine on pyrite (100) by X-ray photoemission spectroscopy: Surface or molecular role?

Sánchez-Arenillas, M.; Gálvez-Martínez, Santos; Mateo‐Martí, Eva

doi:10.1016/j.apsusc.2017.04.049

Cited by 12 publications

(17 citation statements)

References 43 publications

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“…Regarding the pyrite clean surface (see Figure 2), the sulfur peak showed three components: The main one at 162.8 eV, which corresponded to the S 2 2− , clean pyrite surface (FeS 2 , 77%), in agreement with the literature [31,32,33]; a second component at 164.7 eV assigned to a polysulfide species (S-S bonds, 12%) present in natural pyrite [33,34,35]; and a third component at 161.8 eV assigned to the S 2− (FeS, 11%). The iron spectrum showed a main component at 707.4 eV assigned to Fe 2+ (clean iron sulphide, 69%), a second component at 708.9 eV assigned to Fe 2+ (FeS + FeO, 24%) and a third component at 711.1 eV assigned to Fe 3+ (Fe 2 O 3 , 7%) (see Table 1).…”

Section: Resultssupporting

confidence: 82%

“…The O 1s peak was observed at 531.8 eV and was attributed to one component, the oxygen in the COO − groups [31,32,33,34,39] and the C=O of the amide group. The best-fit curve of the N 1s peak consists of two components centred at the binding energies of 400.0 and 402.0 eV, which were assigned to the NH 2 + -NH-CO- and NH 3 + functional groups, respectively [27,34,35] (see Figure 1 for the triglycine molecule). XPS demonstrates successful adsorption of the intact molecule on the pyrite surface.…”

Section: Resultsmentioning

confidence: 99%

“…For the O 1s, a peak was observed at 531.4 eV and was attributed to one component; the oxygen in the COO − groups [31,32,33,34,39], and amide group, and the second component at 532.5 eV was assigned to the air contribution. The best-fit curve of the N 1s peak consisted of only one component centred at the binding energy of 399.8 eV, which was assigned to the NH 2 and the amide group (-NH-CO-) [33,34,35].…”

Section: Resultsmentioning

confidence: 99%

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Ultraviolet Irradiation on a Pyrite Surface Improves Triglycine Adsorption

Gálvez-Martínez

Mateo‐Martí

2018

Life

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We characterized the adsorption of triglycine molecules on a pyrite surface under several simulated environmental conditions by X-ray photoemission spectroscopy. The triglycine molecular adsorption on a pyrite surface under vacuum conditions (absence of oxygen) shows the presence of two different states for the amine functional group (NH2 and NH3+), therefore two chemical species (anionic and zwitterionic). On the other hand, molecular adsorption from a solution discriminates the NH2 as a unique molecular adsorption form, however, the amount adsorbed in this case is higher than under vacuum conditions. Furthermore, molecular adsorption on the mineral surface is even favored if the pyrite surface has been irradiated before the molecular adsorption occurs. Pyrite surface chemistry is highly sensitive to the chemical changes induced by UV irradiation, as XPS analysis shows the presence of Fe2O3 and Fe2SO4—like environments on the surface. Surface chemical changes induced by UV help to increase the probability of adsorption of molecular species and their subsequent concentration on the pyrite surface.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Ultraviolet Irradiation on a Pyrite Surface Improves Triglycine Adsorption

Gálvez-Martínez

Mateo‐Martí

2018

Life

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“…Minerals such as silicates, oxides and sulphides were probably present on early Earth in several environments. Therefore in this context we have study interaction of amino acids [71,72,73], small peptides [74,75] and nucleic bases [76] on several mineral surfaces. We have performed the first spectroscopic characterization of triglycine adsorption on a UV irradiated pyrite surface.…”

Section: Review Of Experimental Resultsmentioning

confidence: 99%

Characterizing Interstellar Medium, Planetary Surface and Deep Environments by Spectroscopic Techniques Using Unique Simulation Chambers at Centro de Astrobiologia (CAB)

Mateo‐Martí

Prieto-Ballesteros

Muñoz

et al. 2019

Life

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At present, the study of diverse habitable environments of astrobiological interest has become a major challenge. Due to the obvious technical and economical limitations on in situ exploration, laboratory simulations are one of the most feasible research options to make advances both in several astrobiologically interesting environments and in developing a consistent description of the origin of life. With this objective in mind, we applied vacuum and high pressure technology to the design of versatile simulation chambers devoted to the simulation of the interstellar medium, planetary atmospheres conditions and high-pressure environments. These simulation facilities are especially appropriate for studying the physical, chemical and biological changes induced in a particular sample by in situ irradiation or physical parameters in a controlled environment. Furthermore, the implementation of several spectroscopies, such as infrared, Raman, ultraviolet, etc., to study solids, and mass spectrometry to monitor the gas phase, in our simulation chambers, provide specific tools for the in situ physico-chemical characterization of analogues of astrobiological interest. Simulation chamber facilities are a promising and potential tool for planetary exploration of habitable environments. A review of many wide-ranging applications in astrobiology are detailed herein to provide an understanding of the potential and flexibility of these unique experimental systems.

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“…Our recent experiments suggest that amino acids can adsorb on the pyrite surface, depending on its structure, the latter being affected by the surroundings or surface pre-treatment conditions. 12,13 These studies provided some new insights into the adsorption process on pyrite surfaces; however, the understanding of amino acid-surface interactions at the atomic level remains limited. Unfortunately, only a few spectroscopic studies on the adsorption of amino acids from the gas phase onto mineral surfaces have been reported.…”

Section: Introductionmentioning

confidence: 99%