Maite Maguregui

Maite Maguregui
Universidad del País Vasco / Euskal Herriko Unibertsitatea | UPV/EHU · Analytical Chemistry

Associate Professor

About

102
Publications
19,850
Reads
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1,837
Citations
Introduction
Characterization of materials belonging to the Built Heritage and archaeology (building materials, paintings, archaeological objects, etc.) using non-invasive spectroscopic techniques (Raman and infrared spectroscopies, NIR, SEM-EDS, ED-XRF, etc.) and destructive techniques (ion chromatography, HPLC, GC, ICP-MS, etc.). Application of chemometrics and thermodynamic modellings to explain deterioration mechanisms. Recent application of these techniques in the field of food analysis and forensics.
Additional affiliations
November 2019 - present
Universidad del País Vasco / Euskal Herriko Unibertsitatea
Position
  • Professor (Associate)
February 2012 - present
Universidad del País Vasco / Euskal Herriko Unibertsitatea
Position
  • Professor (Assistant)
Description
  • Assistant Profesor in the Faculty of Pharmacy giving lectures in the degrees of Food Science and Technology and Environmental Sciences
February 2012 - present
Universidad del País Vasco / Euskal Herriko Unibertsitatea
Position
  • Professor (Assistant)
Education
June 2007 - May 2011
September 2006 - September 2007
Universidad del País Vasco / Euskal Herriko Unibertsitatea
Field of study
  • Pollution and Environmental Toxicology
September 2000 - June 2005
University of the Basque Country, Faculty of Science and Technology
Field of study
  • Chemistry

Publications

Publications (102)
Article
The SuperCam instrument, onboard the Perseverance rover (Mars 2020 mission) is designed to perform remote analysis on the Martian surface employing several spectroscopic techniques such as Laser Induced Breakdown Spectroscopy (LIBS), Time-Resolved Raman (TRR), Time-Resolved Fluorescence (TRF) and Visible and Infrared (VISIR) reflectance. In additio...
Article
Full-text available
It is widely known that the vivid hue of red cinnabar can darken or turn black. Many authors have studied this transformation, but only a few in the context of the archeological site of Pompeii. In this work, the co-occurrence of different degradation patterns associated with Pompeian cinnabar-containing fresco paintings (alone or in combination wi...
Article
Full-text available
Crystallization of soluble salts is a common degradation phenomenon that threatens the mural paintings of Pompeii. There are many elements that contribute to the crystallization of salts on the walls of this archaeological site. Notably, the leachates of the pyroclastic materials ejected in 79 AD by Mount Vesuvius and local groundwater, rich in ion...
Article
This work proposes an innovative non-destructive analytical strategy, based on Confocal Raman micro-spectroscopy, High Resolution Raman Imaging and micro-X-Ray Fluorescence imaging, as part of the quick non-destructive techniques that could be used to characterize the Martian samples from the Mars Sample Return mission when back on Earth. Until tha...
Article
Pyroclastic strata have always been thought to protect the archaeological remains of the Vesuvian area (Italy), hence allowing their conservation throughout the centuries. In this work, we demonstrate that they constitute a potential threat for the conservation state of the mural paintings of Pompeii. The ions that could be leached from them and th...
Article
Pyroclastic materials buried and protected ancient Pompeii throughout the centuries. In this work, we demonstrate that they could represent a threat for the conservation state of the mural paintings, since rainwater and groundwater cause the leaching and transfer of ions to the mural paintings, promoting salt crystallisation. At Pompeii, the latter...
Article
In this work, an innovative non-destructive monitoring methodology based on the analysis over time of open-air rock art sites is presented. This approach is based on the combination of in situ spectroscopic and chemometric studies to diagnose and monitor the state of conservation of rock art sites. Data acquired over a period of time by non-invasiv...
Article
Air pollution represents a serious risk for the preservation of open-air Cultural Heritage. The increased on Particulate Matter contamination may contribute to trigger the sulphating process of porous building materials and to add new ions, which may react and change the original composition of the materials. Because of this, the knowledge of PM co...
Article
In analytical chemistry, biomonitoring is known as the methodology, which consider the use of living organisms to monitor and assess the impact of different contaminants in a known area. This type of monitoring is a relatively inexpensive method and easy to implement, being a viable alternative to be developed in sites where there is no infrastruct...
Article
Marine aerosol is a chemical complex system formed by inorganic salts and organic matter, together with airborne particulate matter from the surrounding environment. The primary particles transported in the marine aerosol can experiment different chemical reactions in the atmosphere, promoting the so-called Secondary Marine Aerosol particles. These...
Article
Speciation of respirable particles is becoming increasingly important from an epidemiological and analytical point of view to determine the potential effects of air pollution on human health. For this reason, current laws and analytical sampling methods focus on particle size, as it turns out to be the main factor for the greater or lesser penetrat...
Article
Ariadne's house is in the Regio VII of the Archaeological Park of Pompeii (Italy). As it is exposed to external alteration agents (rainfall, water infiltration and atmospheric pollution), the mural paintings located in this important residence clearly show the effects of ongoing degradation processes. This is especially the case of Room 22 (also ca...
Article
Buildings close to the sea experience different kinds of decay processes related with the influence of marine aerosol. This sea spray is a chemically complex system formed by inorganic salts (sulfates, nitrates and mainly chlorides) and organic matter, together even with airborne particulate matter from the surrounding environment. Buildings close...
Article
Machu Picchu is an archaeological Inca sanctuary from the 15th century, located 2430 m above the sea level in the Cusco Region, Peru. In 1983, it was declared World Heritage Site by UNESCO. The surroundings and soils from the entire archaeological site are carefully preserved together with its grass parks. Due to the importance of the archaeologica...
Article
Biodeteriogens growing on constructions belonging to the built heritage is one of the leading natural pathologies that cause aesthetical and in some cases, physical-geochemical problems in the materials. In this study, for the first time, the chemical composition of construction materials of the built heritage from an industrialized city (Barranqui...
Article
Alcoholic beverages, especially great wines and spirits, are prime targets for counterfeiters. The simplest form of wine fraud involves fixing counterfeit labels of expensive wines to bottles of less expensive wine. However, time-consuming analytical techniques requiring liquid sampling are mainly used for authentication purposes, which irremediabl...
Article
Machu Picchu citadel is the main archaeological Inca sanctuary widely known around the world, and a World Heritage Site of high cultural and natural value. For its construction a whitish granitic rock, extracted from the "Vilcapampa or Vilcabamba" batholith formation was used. During time, some of the granitic rocks from the natural stonewalls of t...
Article
Most of the wall paintings from Pompeii are decorated with red and yellow colors but the thermal impact of 79 AD Mount Vesuvius eruption promoted the partial transformation of some yellow-painted areas into red. The aim of this research is to develop a quantitative Raman imaging methodology to relate the transformation percentage of yellow ochre (g...
Article
Construction materials affected by black crusts (BCs) can be subjected to restoration, demolition, recycling or even to their management as waste products. Therefore, the determination of their chemical features should be considered a crucial step before undertaking any action. In this work, we present the development of an analytical methodology u...
Article
The European Space Agency will launch the ExoMars Martian mission in 2020, which will study traces of water activity through the geological history of Mars, as water would mean potential presence of life. In this sense, silicates, and more concretely phyllosilicates, are among the most relevant mineral phases to be studied on the Martian surface at...
Article
The nature of the PM2.5 and PM10 varies enormously depending on the anthropogenic activities developed in the surrounding environment. These particles can include Hazardous Elements (HEs), such as heavy metals, which can be considered dangerous for the human health. For this reason, determining the nature of those HEs that are present in the surrou...
Article
Full-text available
The city of Nájera, located in the north of the Iberian Peninsula, hosts an alcazar of Arab origin, which became the residence of the king of Pamplona-Nájera and later of the duke and duchess of Nájera. From this last period (1500–1600) date the ceramics that were unearthed during the recent excavations of the Alcázar of Nájera. These findings cons...
Article
Salt crystallization is one of the major problems currently facing the field of architecture and construction. Its effects are devastating to the extent that they may even lead to loss of material. Although many innovative and resistant materials have been developed in the last years, in most of the constructions salt crystallization is a persisten...
Article
Raman microscopy is a molecular technique that is able to detect compounds that are present in the samples at minor/trace levels thanks to the precise focusing on particles of interest. The detection will also depend on the Raman scattering of the measured compound. Moreover, due to the nondestructive character of the measurements, this technique i...
Article
Machu Picchu Inca sanctuary (Cusco Region, Peru) was constructed on a granitic plateau, better known as Vilcabamba batholith. One of the most important carved granitic rocks from this archaeological site is the Sacred Rock, used by Inca citizens for religious rituals. Due to the location and climatic conditions, different rocks from this archaeolog...
Article
Raman spectroscopy and X-ray fluorescence spectrometry are powerful analytical techniques that allow for molecular and elemental analysis, respectively. Recent developments allowed for the miniaturization of equipment to an extent that in-situ experiments become available. There are many advantages in using portable instruments, but this requires s...
Article
Compositional analysis of ceramics plays a crucial role in Archaeology because following the proper methodology, it enables to obtain knowledge about past human behavior. In this regard, X-Ray Fluorescence Spectrometry (XRF) involves promising possibilities on the non-destructive analysis of pottery. Nonetheless, in comparison to traditionally empl...
Article
Full-text available
Mosaics, one of the most important decorative artworks in the Roman culture, were usually elaborated with a set of tesserae joined with lime or others binders to form geometric or figurative decorations. The identification of both substrate and colored compounds of the tesserae is a challenge for chemists and archaeologists. In this work, two mosai...
Article
The application of a non-destructive analytical procedure to characterise the mineral phases in meteorites is a key issue in order to preserve this type of scarce materials. In the present work, the Elephant Moraine 83227 meteorite, found in Antarctica in 1983 and originated from 4 Vesta asteroid, was analysed by micro-Raman spectroscopy, micro-ene...
Article
The materials used for the building constructions can suffer during their life numerous deterioration processes induced by different anthropogenic and natural factors. For this reason, optimal restoration works are vitally necessary for a correct Built Heritage preservation process. One of the most critical environment is the marine atmosphere (mar...
Article
In this work, the degradation processes that take place in bricks exposed to marine environments have been studied. Taking into account the importance of this building material where the silicates present in the final product act as stabilizer in the porous material itself, it is necessary to understand the decay processes that occur in these aggre...
Article
Full-text available
The House of Gilded Cupids (Regio VI, Insula 16, 7, 38) was unquestionably one of the most important residences of Ancient Pompeii, where important archaeological artefacts such as mural paintings, mosaics, sculptures and lalariums were rediscovered. This work characterizes two wall mirrors that, together with those recovered from the House of Efeb...
Article
Pigments are one of the most important archaeological records recovered from the burial of Pompeii. Therefore, their analysis and characterization is an important task from the historical, archaeological and chemical point of view. In this work, a unique collection of various coloured raw pigments conserved in their original bowls recovered from th...
Article
Over years, numerous consolidation formulations and procedures have been developed and tested on lithic materials. It was clearly proven that some consolidation protocols applied on stone monuments years ago were not the best ones, jeopardizing the state of conservation of the intervened artwork. An example of this was the use of modern cement to f...
Article
In this work, a reddish biocolonization composed mainly by Trentepohlia algae affecting a synthetic building material from a modern building from the 90s located in the Bizkaia Science and Technology Park (Zamudio, North of Spain) was characterized and its ability to accumulate metals coming from the surrounding atmosphere was evaluated. To asses i...
Article
This study aimed at using portable analytical techniques to characterize original and decayed materials from two murals paintings of Ariadne House (archaeological site of Pompeii, Italy) and define the degradation pathways threatening their conservation. The first wall, located in an outdoor environment, has been directly exposed to degradation pro...
Article
Wavelength Dispersive X-ray fluorescence (WD-XRF) spectrometry has been widely used for elemental quantification of mortars and cements. In this kind of instruments, samples are usually prepared as pellets or fused beads and the whole volume of sample is measured at once. In this work, the usefulness of a dual Energy Dispersive X-ray fluorescence s...
Article
During last decades, rock shelter paintings have been described as the most magnificent expression of the scenes of ancient daily lives culture in graphic form. In the scientific field, different analytical techniques have been used for the characterization of different pigments present in the pictographs from rock shelter paintings. Example of thi...
Article
Japanese armour is thought to have evolved from the armour used in ancient China and Korea.Few are the works dealing with the characterisation of the materials used to create this appreciate artworks and most of them are focused on the characterisation of the helmet. In this work we present for the first time an in situ non-invasive methodology to...
Article
Full-text available
Red and yellow bricks are the wall-building materials generally used in Roman masonries. The reasons for the different coloration are not always understood, causing loss of crucial information both for the conservation and for the archaeological knowledge of the cultural sites. In this work, a combination of in situ analyses, employing portable Ram...
Article
Marine aerosol is a complex inorganic and organic chemistry system which contains several salts, mainly forming different type of salt clusters. Different meteorological parameters have a key role in the formation of these aggregates. The relative humidity (%RH), temperature, CO, SO2 and NOx levels and even the O3 levels can promote different chemi...
Article
In this work, a Total Reflection X-ray fluorescence (TXRF) spectrometry based quantitative methodology for elemental characterization of liquid extracts and solids belonging to old building materials and their degradation products from a building of the beginning of 20th century with a high historic cultural value in Getxo, (Basque Country, North o...
Article
Full-text available
The walls and mural paintings of Pompeii exposed directly to the rainfalls are the most impacted in view of the observed decay. However, there are also wall paintings in protected rooms showing evidences of decaying. The aim of this research was to study the salts formed in such protected wall paintings only by non-invasive and in-situ Raman spectr...
Article
Meteorites and impact glasses have been largely analysed using different techniques, but most studies have been focused on their geological–mineralogical characterization and isotopic ratios, mainly of a destructive nature. However, much more information can be gained by applying novel non-destructive analytical procedures and techniques that have...
Article
Full-text available
This work was focused on the study of the biodegradation processes jeopardizing a mural painting conserved in the basement of Ariadne House (archaeological site of Pompeii, Italy). The fresco stood out for its peculiar state of preservation: the upper part, recovered in 1988, was just barely colonized by microorganisms. On the contrary, the lower p...
Article
The use of hand-held X-ray fluorescence (HH-XRF) spectrometers has increased in the last years due to its easily portable capacity and its rapid and non-destructive analysis. In this work, HH-XRF is proposed as a fast in situ non-invasive technique to classify mortars from a construction of high historical value. The current HH-XRF devices are able...
Article
Full-text available
Imaging mass spectrometry (IMS) is quickly becoming a technique of reference to visualize the lipid distribution in tissue sections. Still, many questions remain open, and data analysis has to be optimized to avoid interpretation pitfalls. Here we analyze how the variation on the [Na+]/[K+] relative abundance affects the detection of lipids between...
Article
The concentration of several elements (Al, Ba, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Sn, Sr, Ti, V and Zn) in soils and different parts (roots, stems, leaves and fruits) of tomato plants (Solanum lycopersicum) from 11 cultivars located in Biscay (Basque Country) was measured, in order to evaluate metal uptake, transportation, and accumulation in tomato p...
Article
Ripening is one of the most important transformations that fruits and vegetables suffer, from an unripe to a ripe stage. In this study, it was followed up and analyzed the variations in the composition of tomato fruits at different ripening stages (green or unripe, orange or middle ripe, red or ripe and brown or overripe). The results obtained from...
Article
Most of the magnificent wall paintings from the ancient city of Pompeii are decorated with red and yellow colors coming from the used ochre pigments. The thermal impact of the pyroclastic flow coming from the eruption of Vesuvius volcano, in the year 79 AD, promoted the transformation of some yellow painted areas into red. In this work original red...
Article
Full-text available
In the present work, several building materials suffering from black crusts and soiled surfaces were evaluated by scanning electron microscopy energy dispersive X-ray spectrometry (SEM-EDS) and micro-Raman spectroscopy. The goal was to examine the elemental and molecular composition, the distribution on the samples, and the morphology of endogenous...
Article
Energy dispersive X-ray fluorescence spectrometry (ED-XRF) is widely used in art and cultural heritage for direct measurements and elemental quantification of solid samples. However, in the literature there are not works dealing with the quantitative application of ED-XRF to liquid extracts coming from samples belonging to cultural heritage. In thi...
Article
The metal accumulation in edible parts of the plants is an important issue to provide a healthy food for the population. Some plants have the ability to take up certain trace elements from metal-polluted soils. Depending on the characteristics of the area and the environment where these plants have been grown, a different metal distribution can be...
Article
The study and characterization of old artifacts such as pigments requires the use of techniques that need a small amount of sample to perform the analysis because of the high value of these samples. In recent years, organic molecules such as anthraquinone dyes have been identified by surfaceenhanced Raman spectroscopy (SERS). However, different sam...
Article
Full-text available
The paint stratigraphy of the two clock faces from the tower clock of the Government Palace in Helsinki (Finland) was analysed in order to determine their original colour before restoration works. Paint cross-section samples from both clock faces were analysed by confocal Raman microscopy and scanning electron microscopy coupled to an energy disper...
Article
The sandstone used in the construction of the tower of La Galea Fortress (Getxo, north of Spain) shows a very bad conservation state and a high percentage of sandstone has been lost. The fortress is located just on a cliff and close to the sea, and it experiments the direct influence of marine aerosol and also the impact of acid gases (SOx and NOx)...
Article
Due to the fact that pigments are not ubiquitous in the archaeological record, the application of non-invasive analytical methods is a necessity. In this work, pink and purple lake pigments recovered from the excavations of the ancient city of Pompeii (Campania, Italy) and preserved in their original bowls at the Naples National Archaeological Muse...
Article
Black crust in buildings can be formed as a result of different kind of chemical and physical reactions between the stone surface and environmental factors (e.g. acid aerosols emitted to the atmosphere, airborne particulate matter, etc.). Moreover, biological colonizations can also be present on them. This kind of pathology is widely present in lim...
Article
Black crust in buildings can be formed as a result of different kind of chemical and physical reactions between the stone surface and environmental factors (e.g. acid aerosols emitted to the atmosphere, airborne particulate matter, etc.). Moreover, biological colonizations can also be present on them. This kind of pathology is widely present in lim...
Article
An innovative in-situ multianalytical methodology is presented to assess the conservation state of a sandstone entrance arch of 18th century La Galea Fortress, located in Getxo, north of Spain. The high number of areas to analyze conducted us to select several portable instruments to perform the work in-situ, that taken measurements in more than 25...
Article
Punta Begoña Galleries were built in 1918 in Getxo (Basque Country, North of Spain) but were abandoned in 1960. Nowadays, their conservation state is very poor. In this work, portable Raman spectroscopy was applied to evaluate the original composition and possible deterioration products of themortars used in the inner walls and those covering the c...
Article
Dry deposition is one of the most dangerous processes that can take place in the environment where the compounds that are suspended in the atmosphere can react directly on different surrounding materials, promoting decay processes. Usually this process is related with industrial/urban fog and/or marine aerosol in the coastal areas. Particularly, ma...
Article
Rainwater is one of the main pollution tracers around the world. There are many reasons that can explain the presence of high concentrations of certain hazardous elements (HEs) in the rainwater (traffic, marine port activities, industry, etc.). In this work, rainwater samples were collected at six different locations in the Metropolitan Bilbao (Bas...
Article
Dry deposition is one of the most dangerous processes that can take place in the environment where the compounds that are suspended in the atmosphere can react directly on different surrounding materials, promoting decay processes. Usually this process is related with industrial/urban fog and/or marine aerosol in the coastal areas. Particularly, ma...