Review
Chemistry, Analytical
Jan Jehlicka, Adam Culka
Summary: This article focuses on the progress and recent developments in the use of portable Raman spectrometric devices in geosciences and scientific testing of cultural heritage objects. Different types of Raman spectrometric devices are described and evaluated, demonstrating their potential in various applications such as art characterization, indoor environments, outdoor investigations, and extreme Earth environments.
ANALYTICA CHIMICA ACTA
(2022)
Article
Spectroscopy
Richard A. Crocombe, Brooke W. Kammrath, Pauline E. Leary
Summary: Over the past 20 years, portable Raman spectrometers have become smaller and more powerful due to advancements in component coupling, grating technology, and electronics. This paper provides an overview of the current landscape, limitations, and future potential of miniature Raman spectrometers, as well as emerging technologies that could lead to new applications.
Article
Spectroscopy
Silvia Bottura-Scardina, Peter Vandenabeele, Catarina Miguel, Antonio Candeias
Summary: This paper explores the use of portable Raman instruments to characterize natural dye lakes in paint mixtures, as an alternative approach to other Raman techniques. The study shows that the typical way of analyzing these materials through SERS or FT Raman spectroscopy is not always desirable in art analysis, thus, the potential of using commercial mobile instruments is explored. The results indicate that the two instruments provide significantly different information.
JOURNAL OF RAMAN SPECTROSCOPY
(2023)
Article
Spectroscopy
Ankit Raj, Chihiro Kato, Henryk A. Witek, Hiro-o Hamaguchi
Summary: The article presents a multistep procedure for calibrating the sensitivity of Raman spectrometers, which was tested and proven effective in improving the accuracy of relative Raman intensities. The additional correction derived from Raman spectral intensities appears to be an important novel step towards the standardization of Raman spectroscopy.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Review
Chemistry, Analytical
Wei Wang, Pinyi Ma, Daqian Song
Summary: Surface-enhanced Raman spectroscopy (SERS) technique combined with nanostructure SERS-active substrates and portable Raman spectrometers has emerged as a promising method for rapid, sensitive, and selective detection, providing unique information about substances. It has potential applications in on-site detection of environment pollutants, agricultural pollutants, biomedical analysis, and other emerging fields.
Article
Spectroscopy
Robert J. Soto, David S. Meriage, Robin L. Wagner, Ting Wang, David J. Semin
Summary: Raman spectroscopy proves useful for rapid identity verification of biotherapeutic protein products in solution, with the development of specific spectral models through PCA to reduce false-negative rates. Instrumental variance is compensated for through spectral preprocessing algorithms, leading to successful evaluation on different Raman instruments without false-positive analyses. This work lays the groundwork for implementing Raman ID methods for solution-based protein products in the biopharmaceutical industry.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Spectroscopy
Adam Culka, Jan Jehlicka, Aharon Oren, Anastasia Rousaki, Peter Vandenabeele
Summary: In this study, a fast outdoor screening and discrimination of different carotenoid pigments using miniaturized Raman spectrometers were carried out. Different excitations were used to acquire Raman spectra, and the feasibility of individual wavelengths was examined. The results showed that the 532 nm excitation consistently provided the best results, while the 785 nm excitation was the least suitable. The study has implications for the search and discrimination of biomarkers, such as carotenoids, in the field of astrobiology.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Analytical
Yanru Zhao, Shiyan Fang, Yongkai Ye, Keqiang Yu
Summary: This study utilized NIR and Raman spectroscopy combined with machine learning algorithms to diagnose different infection degrees of AVC, achieving effective classification by selecting optimal variables, which confirms the potential application of molecular vibrational spectroscopy techniques for early detection of AVC and disease diagnosis in large-scale orchards.
VIBRATIONAL SPECTROSCOPY
(2021)
Article
Chemistry, Analytical
Samaneh Ehsani, Hassan Yazdanpanah, Hadi Parastar
Summary: In this study, the feasibility of using portable NIR spectrometers and advanced data analysis techniques for screening orange juice samples and detecting adulterants was explored. The results showed high sensitivity and specificity in both calibration and prediction sets, surpassing the performance of commonly used techniques in food authentication.
MICROCHEMICAL JOURNAL
(2023)
Article
Automation & Control Systems
Diane Abderrahim, Saffaj Taoufiq, Ihssane Bouchaib, Reda Rabie
Summary: This study explores the potential of using miniaturized handheld Near-Infrared (NIR) sensors in combination with machine learning and chemometrics to assess the nitrogen status of tomato plant leaves in the field. The findings suggest that combining the first- or second-order SG derivatives with the MSC is the optimal spectral data preprocessing method, and incorporating wavelengths selection techniques improves the predictive accuracy of the models. The best model achieved R2 values of 81.0-82.8, RMSE values of 7.4-7.8, and RPD values of 2.3-2.4. Overall, this study demonstrates the effectiveness of combining NIRS with ML and chemometrics for evaluating plant-N status and highlights the importance of spectral preprocessing, modeling, and wavelengths selection techniques.
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS
(2023)
Article
Chemistry, Analytical
Silvia Perez-Diez, Africa Pitarch Marti, Anastasia Giakoumaki, Nagore Prieto-Taboada, Silvia Fdez-Ortiz De Vallejuelo, Alberta Martellone, Bruno De Nigris, Massimo Osanna, Juan Manuel Madariaga, Maite Maguregui
Summary: This study investigates how Pompeian cinnabar-containing fresco paintings degrade in different environments, with a focus on the impact of hydrogen sulfide and sulfur dioxide emitted during the 79 AD eruption. It also points out that darkening on the cinnabar paintings may not solely be due to the transformation of the pigment itself, but also to the presence of manganese and iron oxide formation.
ANALYTICAL CHEMISTRY
(2021)
Article
Agriculture, Dairy & Animal Science
Hulya Yaman, Didem P. Aykas, Rafael Jimenez-Flores, Luis E. Rodriguez-Saona
Summary: A rapid and simple method based on vibrational spectroscopic techniques was developed to understand biochemical changes during the ripening process of Turkish white cheese and generate predictive algorithms. The models showed good correlation between predicted values by vibrational spectroscopy and reference values, providing real-time tools for addressing deviations in cheese manufacturing. Portable vibrational spectroscopy units can be used for rapid in-situ monitoring of cheese quality during aging.
JOURNAL OF DAIRY SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Russell S. Harmon, Daria Khashchevskaya, Michelle Morency, Lewis A. Owen, Morgan Jennings, Jeffrey R. Knott, Jason M. Dortch
Summary: The innovative use of handheld LIBS for in situ analysis of rock varnish has successfully identified emission peaks for the nine elements most abundant in the veneer. This research helps to better understand rock varnish formation and its potential utility for weathering and chronological studies.
Article
Spectroscopy
K. Alicia Strange Fessler, Abigail Waldron, Arelis Colon, J. Chance Carter, S. Michael Angel
Summary: Three spatial heterodyne Raman spectrometers, including one free standing and two monolithic, were utilized for remote Raman and LIBS testing on samples at different distances, as well as 1D Raman imaging. The study demonstrated that using large laser spots can reduce sample photodegradation during Raman testing, while 1D imaging provides better signal-to-noise ratio spectra.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2021)
Article
Chemistry, Multidisciplinary
Jasmine Rita Petriglieri, Danilo Bersani, Christine Laporte-Magoni, Mario Tribaudino, Alessandro Cavallo, Emma Salvioli-Mariani, Francesco Turci
Summary: Portable Raman spectrometer (pRS) can effectively detect asbestos and asbestos-like minerals in mining sites, with a success rate of approximately 80% even for complex samples. The main challenges faced during in situ pRS measurements are fluorescence emission and focusing the laser beam on non-cohesive fiber bundles. pRS is considered suitable for discriminating asbestos and asbestos-like minerals in situ, which can support risk assessment of mining sites for better protection of workers and the environment.
APPLIED SCIENCES-BASEL
(2021)
Article
Geology
Victoria E. McCoy, Arnoud Boom, Oliver Wings, Torsten Wappler, Conrad C. Labandeira, Carole T. Gee
Summary: Through modern imaging and chemical analyses, a deeper understanding of the chemical composition and preservation of the fibrous plant material called Affenhaar from the middle Eocene lignites of Geiseltal in Germany has been achieved. The material represents a very rare case of fossil laticifers, and high-resolution X-ray microcomputed tomography has been used for the first time to elucidate the anatomy of tissues within the monkeyhair tree. These fossil laticifers contained natural rubber dominated by cis-1,4-polyisoprene, as well as various triterpenoids, and the vulcanization process most likely occurred during early diagenesis.
Article
Meteorology & Atmospheric Sciences
Bruno B. L. Cintra, Manuel Gloor, Arnoud Boom, Jochen Schongart, Jessica C. A. Baker, Francisco W. Cruz, Santiago Clerici, Roel J. W. Brienen
Summary: Recent climate observations show that the dry season in the Amazon Basin has become longer and drier over the past four decades, with a possible drying trend not unprecedented in the past 80 years. This trend is linked to a warming Tropical North Atlantic Ocean, resulting in a decrease in dry season rainfall.
Article
Astronomy & Astrophysics
Yannick J. Lara, Andrea McCann, Cedric Malherbe, Camille Francois, Catherine F. Demoulin, Marie Catherine Sforna, Gauthier Eppe, Edwin De Pauw, Annick Wilmotte, Philippe Jacques, Emmanuelle J. Javaux
Summary: This study identified a gloeocapsin-producing cyanobacteria strain and compared the pigment extracted from the culture with a natural sample. The analysis of the pigment extract provided the molecular formula of gloeocapsin, suggesting it was either inherited from a common ancestor or acquired through lateral gene transfer. This work represents an important step towards understanding the structure and biosynthesis of this enigmatic pigment, and it offers a new biosignature for ancient cyanobacteria.
Article
Ecology
Andrew S. Carr, Brian M. Chase, Arnoud Boom, Michael E. Meadows, Javier Medina Sanchez
Summary: This study presents the stable carbon and nitrogen isotope compositions of plants and soils from South Africa's Fynbos and Succulent Karoo biomes and assesses the variability within and between the biomes. The results show that the Succulent Karoo has higher foliar δ13C values, primarily due to the higher abundance of CAM photosynthesis compared to the Fynbos. Additionally, foliar δ15N is significantly higher in the Succulent Karoo, and there is a positive correlation between soil and foliar δ15N. Both soil and foliar δ15N show stronger correlations with climate than δ13C.
JOURNAL OF ARID ENVIRONMENTS
(2022)
Article
Chemistry, Multidisciplinary
Wendy H. Muller, Andrea McCann, Anthony Arguelles Arias, Cedric Malherbe, Loic Quinton, Edwin De Pauw, Gauthier Eppe
Summary: In this study, a SALDI mass spectrometry imaging (MSI) technique was used to image a co-culture of Pseudomonas and Bacillus bacteria grown on agar. A rapid and easy sample preparation method using DIUTHAME and blotting was proposed. The advantages and limitations of this new sample preparation method are discussed.
Article
Astronomy & Astrophysics
Lucas Demaret, Ian B. Hutchinson, Richard Ingley, Howell G. M. Edwards, Nathalie Fagel, Philippe Compere, Emmanuelle J. Javaux, Gauthier Eppe, Cedric Malherbe
Summary: By analyzing an extinct hydrothermal chimney from the Jaroso hydrothermal system in Spain, this study confirmed the microbial colonization features of iron-rich hydrothermal chimneys in marl substrates, demonstrating that Raman spectroscopy is an effective tool for documenting the habitability of ancient hydrothermal environments.
Article
Chemistry, Analytical
Gauthier Emonds-Alt, Cedric Malherbe, Alice Kasemiire, Hermane T. Avohou, Philippe Hubert, Eric Ziemons, Jean-Christophe M. Monbaliu, Gauthier Eppe
Summary: In this study, a method based on surface enhanced Raman spectroscopy and microfluidic system was developed for the detection of glyphosate and its main breakdown product, AMPA, in tap water. The method showed rapid, sensitive, and automated features and was validated in the experiment.
Article
Plant Sciences
Marisa Maia, Andrea McCann, Cedric Malherbe, Johann Far, Jorge Cunha, Jose Eiras-Dias, Carlos Cordeiro, Gauthier Eppe, Loic Quinton, Andreia Figueiredo, Edwin De Pauw, Marta Sousa Silva
Summary: This study successfully localized the molecules involved in the initial moments of grapevine-Plasmopara viticola interaction using MSI and found their accumulation on the veins. This provides important clues for further understanding the infection mechanism of P. viticola.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Environmental Sciences
Jessica C. A. Baker, Bruno B. L. Cintra, Manuel Gloor, Arnoud Boom, David Neill, Santiago Clerici, Melanie J. Leng, Gerhard Helle, Roel J. W. Brienen
Summary: Changes in the Amazon hydrological cycle have significant implications for the world's largest tropical forest and its biodiversity. However, the lack of long-term climate data in the region hinders our understanding of recent changes in Amazon hydrology. In this study, researchers analyze tree-ring oxygen isotope chronologies to shed light on hydrological changes in the Amazon over the past two centuries. The results reveal a strong correlation between tree-ring oxygen isotope records and interannual variation in Amazon River discharge and upwind precipitation. The findings suggest that rising sea surface temperatures in the North Atlantic may be the main driver behind the long-term increase in tree-ring oxygen isotope values, while recent decades have seen a reversal of this trend due to the strengthening of the Amazon hydrological cycle.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Chemistry, Physical
Morgane Valentin, Damien Coibion, Benedicte Vertruyen, Cedric Malherbe, Rudi Cloots, Frederic Boschini
Summary: In pharmaceutical applications, macroporous spherical granules of mannitol were successfully prepared using a spray-drying process with polystyrene beads as a sacrificial templating agent. The presence of PS beads was found to favor the formation of the alpha mannitol polymorph. Different atomization configurations in the pilot-scale spray dryer resulted in different distributions of granule size and porosity.
Article
Biodiversity Conservation
Dylan M. Young, Andy J. Baird, Paul J. Morris, Greta C. Dargie, Y. Emmanuel Mampouya Wenina, Mackline Mbemba, Arnoud Boom, Peter Cook, Richard Betts, Eleanor Burke, Yannick E. Bocko, Sarah Chadburn, Dafydd E. Crabtree, Bart Crezee, Corneille E. N. Ewango, Yannick Garcin, Selena Georgiou, Nicholas T. Girkin, Pauline Gulliver, Donna Hawthorne, Suspense A. Ifo, Ian T. Lawson, Susan E. Page, A. Jonay Jovani-Sancho, Enno Schefuss, Matteo Sciumbata, Sofie Sjogersten, Simon L. Lewis
Summary: Peatlands in the central Congo Basin have accumulated carbon over millennia. A new model reveals the relationship between the age and depth of peat and identifies two key controls on peat accumulation. The study also highlights the catastrophic loss of peat carbon that can occur due to changes in rainfall.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Spectroscopy
Lucas Demaret, Hannah N. N. Lerman, Melissa McHugh, Ian B. B. Hutchinson, Nathalie Fagel, Gauthier Eppe, Cedric Malherbe
Summary: Clays on Mars indicate multiple episodes of water activity, especially in the early period. Analyzing clay samples from Germany can provide guidance for Martian exploration missions using miniaturized Raman instruments. Raman signatures of kaolinite and various types of smectite were identified, and accessory minerals in the clay matrix were also detected.
JOURNAL OF RAMAN SPECTROSCOPY
(2023)
Article
Chemistry, Analytical
Alexandre Verdin, Sian Sloan-Dennison, Cedric Malherbe, Duncan Graham, Gauthier Eppe
Summary: In this study, we successfully achieved high specific targeting and measurement of folate receptor alpha (FRα) in cancer cells by building nanotags based on nanoparticles. The PERS response of the nanotags was positively correlated with the expression level of FRα, enabling the discrimination of different expression levels of cancer cells. Moreover, due to the biocompatibility of the nanotags, measurements could be performed on live cells, providing flexibility for experimental conditions.
Article
Forestry
Roel Brienen, Gerhard Helle, Thijs Pons, Arnoud Boom, Manuel Gloor, Peter Groenendijk, Santiago Clerici, Melanie Leng, Christopher Jones
Summary: The study finds that the limitations to tree growth in closed-canopy forests can vary depending on the environment, with understory trees being limited by light and canopy trees being limited by drought. By analyzing ring width and carbon isotopes, the study shows that light is the main limiting factor for understory growth, while drought is the main limiting factor for (sub)canopy growth.
Review
Spectroscopy
Wendy H. Mueller, Alexandre Verdin, Edwin De Pauw, Cedric Malherbe, Gauthier Eppe
Summary: Surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) is a technique that uses nanostructured substrates to promote the desorption/ionization of analytes, allowing for both untargeted and targeted analysis. This review focuses on SALDI-MS imaging (SALDI-MSI), discussing the nomenclature, fundamental mechanisms, analytical strategies, and applications in various fields. SALDI-MSI has strengths and limitations, but shows promising prospects for future development.
MASS SPECTROMETRY REVIEWS
(2022)