Article
Physics, Multidisciplinary
Lynda Idjouadiene, Toufik A. Mostefaoui, Hocine Djermoune, Farid Ziat, Letizia Bonizzoni
Summary: Through X-ray fluorescence analysis of 69 ancient Numidian coins, it was discovered that coins from the kingdom of Massinissa were lead-rich, while coins from other kingdoms used copper-based alloys. The results revealed three distinct groups of coins, reflecting consistency with technological and historical evolution.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Spectroscopy
M. Ghosh, S. Biswas, K. K. Swain
Summary: The air particulate matter generated during welding operations poses a major health risk to welders as they can cause respiratory diseases. This study aimed to analyze the elemental composition of the air particulate matter at a welding site using energy dispersive X-ray fluorescence (EDXRF) and total reflection X-ray fluorescence (TXRF). The results showed that the major contributors to the particulate matter were aluminum, silicon, calcium, and iron. The composition of the particulate matter was influenced by the welding material and adjacent construction activities. The study demonstrated the fast and non-destructive analysis capability of EDXRF and TXRF for air particulate samples.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2022)
Article
Veterinary Sciences
Laurena Silva Rodrigues, Jamile Andrea Rodrigues da Silva, Jose de Brito Lourenco-Junior, Andre Guimaraes Maciel e Silva, Andre Martinho de Almeida, Miguel Pedro Mourato, Vinicius Costa Gomes de Castro, Andreia Santana Bezerra, Welligton Conceicao da Silva, Jose Antonio Mestre Prates
Summary: This study evaluated the influence of different production systems and rearing methods on the mineral profile of buffalo muscle in the Eastern Amazon. It found significant differences in mineral concentrations in the muscle based on the systems, seasons, and locations.
FRONTIERS IN VETERINARY SCIENCE
(2023)
Article
Chemistry, Analytical
Nevenka Mijatovic, Milica Vasic, Ljiljana Milicic, Milena Radomirovic, Zagorka Radojevic
Summary: This paper compares different techniques for preparing raw clay samples and concludes that the fired pressed pellet approach is the most practical and precise method.
Article
Chemistry, Analytical
Qingxian Zhang, Hui Li, Hongfei Xiao, Jian Zhang, Xiaozhe Li, Rui Yang
Summary: The paper introduces a Poisson distribution-based asymmetrically reweighted penalized least squares method (PD-AsLS) for automatically correcting baseline in X-ray spectra. The experimental results demonstrate that PD-AsLS can reliably estimate the baseline of X-ray spectra and effectively suppress statistical fluctuation.
ANALYTICAL METHODS
(2021)
Article
Biotechnology & Applied Microbiology
Nanna Rhein-Knudsen, Chengran Guan, Geir Mathiesen, Svein Jarle Horn
Summary: This study demonstrates that using culture supernatants directly as a source of alginate lyases is an efficient method for saccharification of seaweed biomass, improving the glucose concentration by 73% compared to using only cellulases.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Chemistry, Analytical
Marco Aurelio Speranca, Paloma Andrade Martins Nascimento, Fabiola Manhas Verbi Pereira
Summary: The study examines the environmental impacts of using chemical additives during sugarcane juice clarification stages and proposes a new method using EDXRF technology for mineral impurity assessment.
MICROCHEMICAL JOURNAL
(2021)
Article
Agriculture, Dairy & Animal Science
Christina Peleki, Evangelos Kiosis, Zoe S. Polizopoulou, Georgios Tsousis, George C. Fthenakis, Nektarios D. Giadinis, Christos Brozos
Summary: During the peri-parturient period, the development of the fetus and the production of colostrum and milk increase the energy and mineral requirements in ruminants, leading to a higher risk of metabolic diseases. This study investigated the effects of sugar beet pulp and anionic salts on preventing peri-parturient hypocalcemia in Chios dairy sheep. The results showed that the administration of sugar beet pulp and anionic salts during the dry period had a beneficial effect in preventing hypocalcemia. It is concluded that feeding sugar beet pulp and systemic acidifying before parturition is safe and might even be beneficial in preventing hypocalcemia.
Article
Chemistry, Applied
Beata Zawisza, Marcin Musielak, Dalene de Beer, Elizabeth Joubert, Beata Walczak
Summary: The elemental analysis of tea using non-destructive EDXRF method revealed statistical differences in composition between rooibos and honeybush, with multivariate analysis confirming the significance. The study also provided concentration ranges for elements like calcium, potassium, and magnesium in tea samples.
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
(2021)
Article
Chemistry, Analytical
Buddhadev Kanrar, S. Sanjay Kumar, S. Mondal, N. L. Mishra, Sangita Dhara
Summary: A method has been developed for direct non-destructive energy dispersive X-ray fluorescence (EDXRF) determination of sulfur in solid uranium ores and intermediates. The method involves grinding solid powder samples to fine particle size, making a paste, transferring it onto Mylar films, and drying to create thin sample specimens for EDXRF measurements. The precision obtained using this methodology was within 5% and the deviation of the analytical results from the expected values of CRM was within 7%.
ANALYTICAL SCIENCES
(2021)
Article
Chemistry, Analytical
Diego Galvan, Carini Aparecida Lelis, Luciane Effting, Fabio Luiz Melquiades, Evandro Bona, Carlos Adam Conte-Junior
Summary: This study investigates the potential of low-cost portable spectroscopy techniques for discriminating adulterated milk. The results show that energy-dispersive X-ray fluorescence (EDXRF) combined with chemometric tools and near-infrared (NIR) spectroscopy can reliably differentiate authentic cow and goat milk from adulterated ones. Both devices achieved high accuracy rates of 98.4% to 100% when combined with appropriate algorithms.
MICROCHEMICAL JOURNAL
(2022)
Article
Spectroscopy
Patricia M. Carvalho, Eva Margui, Aldona Kubala-Kukus, Dariusz Banas, Jorge Machado, Diogo Casal, Diogo Pais, Jose Paulo Santos, Sofia Pessanha
Summary: Elemental content is crucial in biological processes, requiring multielemental analysis of human tissue samples. However, limited sample availability and adipose content can hinder accurate determination. Various analytical approaches combined with TXRF were explored for different tissues, with optimal strategies identified for tissues with higher fat content. Mo-TXRF systems showed enhanced detection limits and accuracy, especially for low Z elements and elements at low concentrations in human tissues. TXRF results compared favorably with mu-EDXRF and ICP-OES results.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2022)
Article
Chemistry, Analytical
Sofia Pessanha, Daniel Braga, Ana Ensina, Joao Silva, Jose Vilchez, Carlos Montenegro, Sofia Barbosa, Maria Luisa Carvalho, Antonio Dias
Summary: In this study, a methodology for non-destructive elemental determination in formalin-fixed paraffin-embedded (FFPE) human tissue samples was presented. The methodology overcame the constraints in analyzing paraffin-embedded tissues by developing an image treatment algorithm and evaluating the dark matrix composition. The results showed distinctive biomarkers for breast and colon tissues, indicating potential elemental biomarkers for carcinogenesis.
Article
Agricultural Engineering
Igor N. Caxiano, Pedro A. Mello, Pedro H. R. Alijo, Leonardo V. Teixeira, Rodrigo F. Cano, Jeiveison G. S. S. Maia, Joao B. V. Bastos, Mauro S. G. Pava
Summary: This study evaluates the scale effects in designing a biorefinery from Sargassum muticum seaweed by conducting detailed process modeling. The results show that there are differences in capital expenditures and product selling prices between the two projects.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agronomy
Georgia E. Guild, James C. R. Stangoulis
Summary: The study demonstrates that EDXRF analysis can accurately and quickly measure the concentrations of Ca, Mn, Fe, Cu, and Zn in lentil and sorghum, with results comparable to the reference ICP-MS analysis.
Article
Chemistry, Analytical
Angelica F. Carneiro, Candice N. Carneiro, Lais de N. Pires, Leonardo S. G. Teixeira, Silvana M. Azcarate, Fabio de S. Dias
Review
Chemistry, Applied
Alisson Dias da Silva Ruy, Rita Maria de Brito Alves, Thiago Lewis Reis Hewer, Danilo de Aguiar Pontes, Leonardo Sena Gomes Teixeira, Luiz Antonio Magalhaes Pontes
Summary: 1,3-Propanediol (1,3-PDO) is obtained from renewable and environmentally friendly glycerol, with high cost genetically modified microorganisms currently used in industrial production. Studies have shown that platinum, iridium, and copper are the most promising metals, with Brønsted sites responsible for higher selectivity and Lewis sites influencing reaction rates.
Article
Food Science & Technology
Lais N. Pires, Jorge S. Almeida, Fabio de S. Dias, Leonardo S. G. Teixeira
FOOD ANALYTICAL METHODS
(2020)
Article
Chemistry, Analytical
Vanessa de Jesus Ferreira, Jorge S. Almeida, Valfredo A. Lemos, Olivia M. C. de Oliveira, Karina S. Garcia, Leonardo S. G. Teixeira
Summary: A method combining RP-VALLME and EDXRF was developed for the determination of Cu, Mn, Ni, and Pb in diesel oil samples, showing low detection limits, good precision, and high recovery rates. This method proved to be efficient and comparable to ICP-OES for the analysis of the four analytes.
Article
Spectroscopy
Jorge S. Almeida, Lucilia A. Meira, Maiara S. Oliveira, Leonardo S. G. Teixeira
Summary: An analytical method using EDXRF was proposed for quantification of Cd, Pb, Mn, and Fe in ground coffee samples, with external calibration using the coffee matrix. The method showed good linearity and precision, with no significant difference observed compared to ICP OES analysis. The proposed method demonstrated effective quantification of these heavy metals in ground coffee samples.
X-RAY SPECTROMETRY
(2021)
Article
Energy & Fuels
Lucilia A. Meira, Jorge S. Almeida, Maiara S. Oliveira, Fabio de S. Dias, Antonio F. S. Queiroz, Sarah A. R. Soares, Leonardo S. G. Teixeira
Summary: The research focuses on the impact of metals on biodiesel quality, proposing a method to determine metal concentrations using EDXRF spectrometry. A novel extraction procedure involving emulsification and magnetic solid-phase microextraction was developed to analyze Cd, Pb, Cr, V, and Mo in biodiesel samples. The optimized extraction process demonstrated high enrichment factors and low detection limits for the metals studied, with recovery tests showing satisfactory results when applied to various biodiesel samples.
Article
Chemistry, Analytical
Shirlei L. Anjos, Jorge S. Almeida, Leonardo S. G. Teixeira, Ana Cristina M. da Silva, Alane P. Santos, Antonio F. S. Queiroz, Sergio L. C. Ferreira, Silvana Mattedi
Summary: Sisal fibers are used as a natural adsorbent to extract metal elements from diesel oil samples for direct analytical measurements by EDXRF. The method is simple and suitable for the determination of metal elements in diesel oil samples.
Article
Chemistry, Physical
Jordan Gonzaga Andrade Batista Silva, Ronaldo Costa Santos, Enrique Rodriguez-Castellon, Leonardo Sena Gomes Teixeira, Luiz Antonio Magalhaes Pontes
Summary: This study focused on the synthesis of sorbitol using Ru/Nb2O5 catalysts, with better results obtained when using crystalline phase Nb2O5 as a support. Structural modification of the catalytic support positively affected catalyst activity and sorbitol production.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Applied
Luciane B. Oliveira, Joelem C. de Melo, Elane S. da Boa Morte, Raildo M. de Jesus, Leonardo S. G. Teixeira, Maria Gracas A. Korn
Summary: The study evaluated the determination of macro-and microelements in chocolate bars using microwave-induced plasma optical emission spectrometry (MIP OES) after microwave-assisted sample digestion. The optimized sample digestion conditions were successfully applied for routine analysis of chocolate bars, showing a wide range of element concentrations. The combination of microwave-assisted acid digestion with MIP OES technique proved to be effective for multi-element determination in chocolate bars.
Article
Chemistry, Applied
Taiana A. Anunciacao, Wellington C. de Carvalho, Maria G. A. Korn, Jorge S. Almeida, Alailson F. Dantas, Leonardo S. G. Teixeira
Summary: An analytical procedure using slurry sampling and ICP OES for multielement determination in enteral nutrition formulations was proposed. The study evaluated the influence of stabilizing agents on slurry composition and achieved LOD of 5-10 μg/L for Cu, Fe, Zn. The method successfully analyzed the concentrations of various elements in enteral nutrition formulations.
Article
Geosciences, Multidisciplinary
Iasmine M. S. Souza, Jose Roberto Cerqueira, Karina S. Garcia, Helio J. P. Severiano Ribeiro, Olivia M. C. de Oliveira, Antonio Fernando S. Queiroz, Leonardo S. G. Teixeira
Summary: The study analyzed 37 Devonian shale samples from the Barreirinha Formation to evaluate hydrocarbon source potential, depositional paleoenvironments, and thermal effects of igneous intrusions. Results showed that samples from the northern border had excellent hydrocarbon source potential with type III kerogen, while samples from the southern border had a range of source potential with type II and III kerogens. Organic extracts and biomarkers suggested different depositional environments, with northern samples showing marine anoxic to oxic conditions and southern samples showing suboxic to oxic conditions. The thermal maturity of the shale samples also differed, with northern samples being at the end of the oil generation window and southern samples at the beginning of the oil generation window.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Correction
Chemistry, Applied
Luciane B. Oliveira, Joelem C. de Melo, Elane S. da Boa Morte, Raildo M. de Jesus, Leonardo S. G. Teixeira, Maria Gracas A. Korn
Article
Chemistry, Multidisciplinary
Leila S. V. Barbosa, Leonardo S. G. Teixeira, Maria G. A. Korn, Rodolfo M. M. Santana
Summary: This study focused on utilizing quantum dots for amino acid sensing and developing an analytical method for rapid clinical tests. It was found that amino acids with positive charge or neutral polar chains responded to glutathione-coated CdTe, with specific responses to L-histidine and L-threonine. The developed method showed a linear range, good precision, and successful recovery tests on artificial and human urine samples.
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Valdinei S. de Souza, Leonardo S. G. Teixeira, Maria G. A. Korn, M. F. M. Cerqueira, Marcos A. Bezerra
Summary: A novel method using extraction induced by emulsion breaking (EIEB) for copper determination in gasohol was developed, with optimized conditions yielding accurate results (95-110% accuracy). The method was successfully applied for copper determination in Brazilian gasoline samples, showing efficiency and simplicity.
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2021)
Article
Food Science & Technology
Jorge S. Almeida, Lucilia A. Meira, Ana D. S. Nascimento, Gabriel L. Santos, Valfredo A. Lemos, Leonardo S. G. Teixeira
Summary: A novel ultrasound-assisted dispersive liquid-liquid microextraction method was proposed for the determination of Cd, Cu, and Fe in margarine samples. The use of an ultrasonic bath assisted in increasing extraction efficiency, with subsequent determination using HR-CS ET AAS. The method showed promising results with low detection limits and recovery rates for the analyzed elements.
FOOD ANALYTICAL METHODS
(2021)
Article
Chemistry, Analytical
Michel Rocha Baqueta, Augusto Cesar Costa-Santos, Ana Paula Rebellato, Gisele Marcondes Luz, Juliana Azevedo Lima Pallone, Federico Marini, Alexsandro Lara Teixeira, Douglas N. Rutledge, Patricia Valderrama
Summary: This study reports the essential element composition of new Brazilian Canephora coffees and applies chemometric tools for analysis. The results demonstrate the suitability of this method for origin and species discrimination based on the inorganic fraction of coffee.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Mengjie Li, Jiapeng Wang, You Zhou, Yang Chen, Lingying Xia
Summary: A novel photoelectrochemical biosensor based on gold nanoparticles and specific structures was developed for highly sensitive detection of mercury ion. The multiple sandwich structures hindered electron supply and light harvesting, resulting in a weakened PEC signal, while the specific structures extinguished the PEC signal, enabling quantitative detection of Hg2+. The sensor exhibited high selectivity and stability, with potential applications in environmental detection, biological analysis, and medical research.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Mohamed A. Korany, Rasha M. Youssef, Marwa A. A. Ragab, Mostafa A. Afify
Summary: A stability-indicating fit-for-purpose method was developed for the determination of HC, TL, and PS in syrup dosage form. The method successfully separated CL from THY and quantified the analytes using HPLC-DAD. The robustness of the method was assessed through statistical analysis and self-validation.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Lingling Lin, Minyu Li, Ping Li, Chenqing Ye, Huanglong Zhuang, Shaohuang Weng, Feng Chen
Summary: This study developed a highly sensitive and selective electrochemical sensor for simultaneous detection of dopamine and uric acid. The sensor exhibited excellent anti-interference and stability, and could accurately measure dopamine and uric acid in human urine samples.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Peifang Chen, Caiyun Jiang, Zhouping Wang, Hong-zhen Lian, Xiaoyuan Ma
Summary: In this study, a high-performance SERS-active aptasensor was successfully developed for the quantitative analysis of AFB1 in cereal grains, which is of great significance in the field of food safety.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
E. Abas, C. Marina-Montes, C. Perez-Marin, J. Puimedon, J. Anzano
Summary: This study conducted a comprehensive measurement of natural and anthropogenic radionuclides in soil, water, and air in different locations around Deception Island in Antarctica. The results revealed significant levels of 210Pb and anthropogenic 137Cs in soil samples near old human settlements and facilities, as well as detectable levels of 137Cs and 60Co in water samples from old hunting areas. The findings also suggested potential resuspension processes based on higher-than-expected air quality results.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Joao Franciso Allochio, Nayara A. dos Santos, Nathalia dos S. Conceicao, Clara S. D. Baptista, Keyller B. Borges, Valdemar Lacerda Jr, Wanderson Roma
Summary: This study developed a fiber spray ionization mass spectrometry (FSI-MS) method, which shows great potential in detecting illicit drugs. Compared with paper spray ionization mass spectrometry (PSI-MS), FSI-MS demonstrates higher sensitivity in COC detection.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Dina A. Ahmed, Ola G. Hussein, Mamdouh R. Rezk, Mohamed Abdelkawy, Yasmin Rostom
Summary: The main goal of this study was to develop two green chromatographic techniques, HPLC and TLC, for the determination of alcaftadine (ALF) in pharmaceutical formulation and biological samples. The developed HPLC technique showed high efficiency and minimal environmental impact, successfully identifying ALF in the presence of its degradate. The TLC method provided a stability indicating study for ALF and was determined to be safe, green, and eco-friendly.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Abdullah Taner Bisgin
Summary: A green, speedy, and handy method for separation and determination of four commonly used food colorants was established using vortex assisted sequential-simultaneous liquid phase micro-extraction (VA-SS-LPME). The method does not require any instrumental chromatographic techniques. The procedure includes sequential separation steps using different extractants and simultaneous UV-vis spectrophotometric determination steps. The method is environmentally friendly and applicable for determination of colorants in food and pharmaceuticals.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Yifan Zhang, Tong Zhang, Wenjing Ba, Li Liu, Yuan Rao, Xiaodan Zhang, Hanhan Zhang, Xiu Jin
Summary: This paper proposes a novel spectral transfer modelling method based on neural network architecture searching for the asymptomatic prediction of Akizuki pear cork spot disorder. The experiments show that the model by this method is more effective, achieving an accuracy of 82.61%.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Krzysztof Greda, Maja Welna, Anna Szymczycha-Madeja, Pawel Pohl
Summary: For the first time, a dispersive micro-solid phase extraction (D-mu SPE) based on graphene oxide was used for the ultrasensitive determination of Cd. With this method, Cd can be efficiently extracted from a mixture of alkali and alkaline earth metals without the need for an elution step. The combination of D-mu SPE and SAGD OES significantly reduces matrix effects and improves the tolerance of Cd to alkali metals. The method shows simplicity in the measurement system and the commercially available nanosorbent used.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
P. K. Fathima Anjila, G. R. Tharani, Anand Sundaramoorthy, Venkat Kumar Shanmugam, Karthikeyan Subramani, Shanmugavel Chinnathambi, Ganesh N. Pandian, Vimala Raghavan, Andrews Nirmala Grace, Singaravelu Ganesan, Mangaiyarkarasi Rajendiran
Summary: This work proposes a rapid and sensitive spectroscopic method for detecting melamine in food products using rare-earth Terbium-doped Graphene Quantum Dots (Tb-GQDs) synthesized by microwave and simple chemical conjugation methods. The synthesized Tb-GQDs show a spherical shape with a size of approximately 6 nm and a quantum yield of 52%. The maximum detection limit for melamine concentration in milk and milk products is found to be 0.31 μM. The dual emitting Tb-GQDs provide a sensitive and effective platform for real-time detection of melamine in food samples, particularly in milk, and show promising potential in the food industry.
MICROCHEMICAL JOURNAL
(2024)
Review
Chemistry, Analytical
Piyush Dey, Mandeep Kaur, Akhil Khajuria, Dilmeet Kaur, Manpreet Singh, Hema Kumari Alajangi, Neha Singla, Gurpal Singh, Ravi Pratap Barnwal
Summary: Environmental issues, such as the uncontrolled release of dangerous pollutants, have significant impacts on human health. Traditional methods for detecting pollutants require specialized personnel and equipment, but nanotechnology has improved the performance of biosensors. This article discusses the use of nanotechnology in pollutant detection and the associated techniques.
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Sa Dong, Qiuyun Shi, Lingjun Guan, Yulong Wang, Pengyan Liu, Cunzheng Zhang, Jianguo Feng
Summary: In this study, a highly sensitive indirect competitive chemiluminescence enzyme immunoassay (icCLEIA) method was developed for the determination of sodium pentachlorophenolate (PCP-Na) and its metabolite pentachlorophenol (PCP). The method showed high specificity and affinity with a detection limit of 0.0032 ng/mL for PCP-Na and 0.0192 ng/mL for PCP. The method had no cross reaction with other chlorophenols compounds except for PCP. The average recoveries in chicken, pork and fish samples were 81.3-105.8% with low coefficient of variation (CV).
MICROCHEMICAL JOURNAL
(2024)
Article
Chemistry, Analytical
Palaniappan Ilayaraja, Murugan Manivannan, Paramasivam Parthiban
Summary: Nirmatrelvir, an antiviral drug used for the treatment of COVID-19, has been recommended by the World Health Organization. We developed an optimized analytical method for the quantification of Nirmatrelvir and its products, with high sensitivity and a wide linear range. The method also meets the requirements for greenness evaluation.
MICROCHEMICAL JOURNAL
(2024)