Article
Materials Science, Multidisciplinary
Wanda Sordon, Gorzata Jakubowska
Summary: A new method using boron-doped diamond electrode (BDDE) and differential pulse voltammetry (DPV) for the determination of phenolic acids (caffeic, ferulic, syringic, and vanillic) was described. This is the first electrochemical method to determine these compounds on BDDE. The method showed good linearity, low detection limits, and high repeatability. It was successfully applied to measure phenolic acids in a model wine solution and in homemade and commercially available products. This analytical approach not only enables the electrochemical detection of phenolic acids but also helps to reduce operational costs.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Ravikumar Murugan, Kuo Yuan Hwa, Aravindan Santhan
Summary: In this study, a low-cost fabrication method was used to synthesize metal/2D graphitic carbon nitride (g-C3N4) nanosheet/metal nanocomposites. The synthesized nanosheet was characterized by various techniques, revealing its porous nanostructure and fine crystalline size. It exhibited excellent electrochemical performance, with low detection limit and high sensitivity, making it suitable for real-time monitoring of water samples.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Oh B. Chae, Leah Rynearson, Brett L. Lucht
Summary: A new method has been investigated to control the morphology and chemical composition of solid electrolyte interphase (SEI) on the Si anode through electrochemical pretreatment by varying the distance between electrodes. The results show that the SEI's chemical composition and structure depend on the electrode distance during electrochemical pretreatment. When the electrode distance is large (>= 2 mm), a LiF-dominant surface film with dispersed LiF nano-particles is generated, improving the electrochemical performance of the Si anode.
ACS ENERGY LETTERS
(2022)
Article
Environmental Sciences
Yajie Tian, Jianzheng Li, Xianhui Li, Jiuling Li, Jia Meng
Summary: The developed method for simultaneous extraction and determination of eight veterinary antibiotics in swine wastewater and activated sludge showed good recoveries, low deviations, and high sensitivity. It has been successfully applied to evaluate the actual concentration levels of antibiotics in the two complex environmental matrices.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Analytical
Shalu Yadav, Mohd Abubakar Sadique, Pushpesh Ranjan, Raju Khan
Summary: In this study, a straightforward and label-free electrochemical immunosensing strategy based on a glassy carbon electrode modified with a biocompatible and conducting biopolymer functionalized molybdenum disulfide-reduced graphene oxide (CS-MoS2/rGO) nanohybrid is proposed to investigate the SARS-CoV-2 virus. The immunosensor employs recombinant SARS-CoV-2 Spike RBD protein (rSP) to specifically identify antibodies against the SARS-CoV-2 virus. The results demonstrate that the immunosensor is capable of highly sensitive and specific detection of SARS-CoV-2 antibodies and can differentiate between positive and negative samples accurately.
ANALYTICA CHIMICA ACTA
(2023)
Article
Chemistry, Applied
Liye Wang, Jiangxiu Niu, Pengyuan Wei, Yilei Feng, Mingyue Ding, Chaojun He, Yongjie Ma, Yaolei Zhu, Jia Li, Lingli Huang, Xiya Zhang
Summary: An immunomagnetic bead (IMB)-based sample purification pretreatment method was developed for simultaneous detection of multiple homologous compounds in animal muscles. The results showed that the IMB method provided better sample purification and enrichment compared to conventional methods, making it a useful tool for determining residues in edible animal tissues.
Article
Chemistry, Analytical
Li Chen, Jincheng Wang, Tyllis Xu, Xinrui Feng, Chuixiu Huang, Xiantao Shen
Summary: Selective serotonin reuptake inhibitors (SSRIs) are the first-line treatment drugs for pregnant and breastfeeding women, and the quantitative analysis of SSRIs in biological samples is crucial in public health and clinical practice. This paper discussed the recent development of sample preparation methods for SSRI analysis, including both traditional and new sample pretreatment techniques.
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2021)
Article
Engineering, Environmental
Weiqiang Li, Xuekun Bai, Fangbin Xiao, Jin Huang, Xianxiang Zeng, Qian Xu, Yang Song, Xiaoyun Xu, Hengyi Xu
Summary: This study introduces a magnetic separation-based electrochemical biosensor for the detection of Methicillin-resistant Staphylococcus aureus (MRSA). The sensor showed good stability and applicability, with a detection limit of 3.8 x 101 CFU/mL. MRSA was successfully detected in cerebrospinal fluid samples with satisfactory recoveries and validation results. Overall, this study presents a promising method for the detection of MRSA, with the potential to be further developed into a universal pathogen detection method.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Biophysics
A. B. Abdallah, Aya Saher, Ahmed Fathi Salem Molouk, Wael Mortada, Magdi E. Khalifa
Summary: The electrochemical behavior of rivaroxaban was investigated using a glassy carbon electrode based on a molecularly imprinted polymer. Both the potentiometric and voltammetric sensors showed a linear response and high precision for the detection of rivaroxaban, with detection limits in the nanomolar range. The sensors were successfully applied for the detection of rivaroxaban in blood samples and pharmaceutical tablets, with acceptable mean recoveries.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Analytical
Hui-Min Zhai, Bin Ji, Shan-Shan Tian, Fang Fang, Shuang Zhao, Zhi-Yong Wu
Summary: This study introduces a new method for Cr speciation analysis based on a paper-based analytical device (PAD), which uses electrokinetic separation and stacking to separate and recover Cr (VI) and Cr (III) with high sensitivity and recovery rates. This fast, cheap, and easy-to-use sample pretreatment method can be applied for direct analysis of Cr (VI)/Cr (III) in electroplating wastewater samples.
Article
Materials Science, Multidisciplinary
Kai Cui, Zhilong Zhao, Ying Tie, Cheng Li, Lufeng Wei
Summary: This study characterizes the real surface area of lamellar Ni3Si electrodes using the potentiostatic step method and analyzes its influencing factors. The results show that the real surface area is related to lamellar spacing and corrosion depth. Increasing lamellar spacing facilitates material exchange but reduces the number of lamellae. The real surface area of the electrode can be adjusted by changing structural parameters.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Cheng Zong, Chi Zhang, Peng Lin, Jiaze Yin, Yeran Bai, Haonan Lin, Bin Ren, Ji-Xin Cheng
Summary: The EPRM technique utilizes a potential-dependent nonlinear photothermal signal to map electrochemical processes with sub-micron spatial resolution, revealing the evolution of surface species on the Pt surface. It allows for real-time imaging with a faster imaging speed, enabling broad applications in catalysis, energy storage, and light harvest systems.
Article
Chemistry, Analytical
Min Liu, Zu-Rong Ni, Hui-Jun Sun, Shuo-Hui Cao, Zhong Chen
Summary: This study proposes an improved in situ electrochemical nuclear magnetic resonance (EC-NMR) method for real-time monitoring of electrochemical reactions. By eliminating different excitation effects of the RF field on the external standard and the electrolyte, as well as improving the accuracy of quantitative determination of reactant concentrations, the reliability and effectiveness of the method are confirmed.
Article
Chemistry, Physical
S. Keerthana, A. Rajapriya, S. Amirthapandian, C. Viswanathan, N. Ponpandian
Summary: The study introduces a hydrothermally prepared WS2/rGO nanocomposite for selective detection of Mesalazine. The electrode exhibits a low detection limit, good sensitivity, and anti-interference capability, as well as remarkable repeatability, reproducibility, and stability. Experimental results demonstrate excellent recovery rates of Mesalazine in analytical samples.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Nanoscience & Nanotechnology
Tata Sanjay Kanna Sharma, Anindita Ganguly, Aravindan Santhan, Kuo-Yuan Hwa
Summary: This study presents an affordable method for preparing one-dimensional gadolinium oxide nanorods and explores their application in electrochemical sensors. The results show that the sensor exhibits stability, selectivity, and high sensitivity.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Analytical
Gabriel Rainer Pontes Manrique, Carlos Alberto Rossi Salamanca-Neto, Jaqueline Tobias Moraes, Elen Romao Sartori
Summary: In this study, the electrochemical monitoring of trace antidepressant in surface waters was successfully achieved using a cathodically pretreated boron-doped diamond electrode coupled with differential pulse voltammetry. The method showed high accuracy and detection sensitivity, and demonstrated good recovery rates in the analysis of real samples.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Jessica Scremin, Gabriel J. Mattos, Robert D. Crapnell, Samuel J. Rowley-Neale, Craig E. Banks, Elen R. Sartori
Summary: A novel electrochemical sensor utilizing a modified glassy carbon electrode covered with a poly(allylamine hydrochloride) film was proposed in this study, allowing for simultaneous determination of dopamine, paracetamol, amlodipine, and rosuvastatin with linear concentration ranges and low detection limits. This sensor showed successful application in environmental, pharmaceutical, and biological samples for the simultaneous determination of these analytes.
Article
Chemistry, Analytical
Gabriel J. Mattos, Carlos A. R. Salamanca-Neto, Eduardo C. M. Barbosa, Pedro H. C. Camargo, Robert F. H. Dekker, Aneli M. Barbosa-Dekker, Elen R. Sartori
Summary: A photoelectrochemical biosensing strategy was developed for highly sensitive detection of the flavonoid rutin. By integrating hematite decorated with palladium nanoparticles and biocatalysis towards laccase-based reactions, a novel biosensing platform was created, showing good sensitivity, selectivity, repeatability, and storage stability.
Article
Chemistry, Analytical
Carlos Alberto Rossi Salamanca-Neto, Gustavo Galo Marcheafave, Gabriel Junquetti Mattos, Jaqueline Tobias Moraes, Karolina Schwarzova-Peckova, Elen Romao Sartori
Summary: In this study, multiple linear regression analyses were used to determine the levels of cold symptom treatment drugs in pharmaceutical formulations and spiked human urine samples. The developed square-wave voltammetric method allowed for simultaneous determination of the drugs with satisfactory recovery rates. Multiple linear regression provided statistically similar results to HPLC-UV, showing its potential as an alternative method for drug analysis and monitoring.
MICROCHEMICAL JOURNAL
(2021)
Article
Electrochemistry
Jessica Scremin, Andre Olean-Oliveira, Carlos A. R. Salamanca-Neto, Graziela S. Ceravolo, Robert F. H. Dekker, Aneli M. Barbosa-Dekker, Craig E. Banks, Marcos F. S. Teixeira, Elen R. Sartori
Summary: This study presents a new voltammetric sensor based on modified glassy carbon electrodes for the electroanalytical determination of cyclobenzaprine, showing improved sensitivity compared to unmodified electrodes. The sensor was characterized using different electrode modifications and successfully applied for the first time in pharmaceutical, biological, and environmental samples for cyclobenzaprine determination.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Applied
Gustavo Galo Marcheafave, Claudia Domiciano Tormena, Amelia Elena Terrile, Carlos Alberto Rossi Salamanca-Neto, Elen Romao Sartori, Miroslava Rakocevic, Roy Edward Bruns, Ieda Spacino Scarminio, Elis Daiane Pauli
Summary: The study chemically explored the ecometabolic mixture design-fingerprinting in coffee under climate change, revealing the best separations under different extractor solvents. 1H NMR and SWV data indicated changes in compound contents in beans with climate change.
Article
Chemistry, Applied
Fabiano Bueno Silva, Claudia Domiciano Tormena, Elis Daiane Pauli, Andressa Gomes de Almeida, Ana Beatriz Coronado Berg, Miroslava Rakocevic, Roy Edward Bruns, Ieda Spacino Scarminio, Gustavo Galo Marcheafave
Summary: This study employed a three-step metabolomics strategy to determine the metabolite abundances in coffee beans from the same Coffea arabica plants planted at different densities and during different berry maturation periods. By using a combination of spectral analysis, chemometrics, and classical analytical assays, the study successfully identified the chemical changes in the coffee beans and their patterns related to planting density and harvest period. The analysis revealed gradual changes in the chemical profiles of coffee beans from the first to the third harvest, confirming the significant impact of planting density and harvest period on the chemical composition of coffee beans.
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
(2021)
Article
Biochemistry & Molecular Biology
Gabriel J. Mattos, Jeseka G. Schirmann, Carlos A. R. Salamanca-Neto, Robert F. H. Dekker, Aneli M. Barbosa-Dekker, Elen R. Sartori
Summary: The study investigated the oxidation process of 2,6-dimethoxyphenol by laccase from Botryosphaeria rhodina MAMB-05 and the enzyme's classification as a high oxidation potential laccase based on different pH levels. Results showed that the substrates and mediators were effectively oxidized by the laccase, with the influence of laccase on the comproportionation of ABTS and the ionic step of the oxidation of TEMPO studied using cyclic voltammetry. The potential difference between laccase and the substrate was found to correlate with enzyme activity, while no clear correlation was observed between laccase and mediators with enzyme activity towards 2,6-DMP.
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2022)
Article
Chemistry, Applied
Anna Beatriz Sabino Ferrari, Gustavo Galo Marcheafave, Helena Mannochio-Russo, Vanderlan da Silva Bolzani, Diego Cunha Zied, Ieda Spacino Scarminio, Maria Luiza Zeraik
Summary: The study found that handmade supplements based on agro-industrial waste can replace commercial supplements in terms of nutritional composition, as they exhibit similar chemical differences with mushrooms cultivated with commercial supplements. Additionally, chromatographic analysis showed that the similarity of strains is correlated with the relative abundance of antioxidant compounds, indicating that handmade supplements could be a viable alternative to high-cost supplements.
Article
Chemistry, Applied
Claudia Domiciano Tormena, Rafaela Cassia Souza Campos, Gustavo Galo Marcheafave, Roy Edward Bruns, Ieda Spacino Scarminio, Elis Daiane Pauli
Summary: Bean authentication using PLS-DA with digital images allows for the nondestructive discrimination of different Phaseolus vulgaris L. cultivars. Building three separate PLS1-DA models for two cultivars each was found to be more effective than a simultaneous treatment for all three cultivars (PLS2-DA). This method can be applied for bean quality control and cultivar authenticity in commerce.
Article
Chemistry, Analytical
Gabriel J. Mattos, Gustavo G. Marcheafave, William H. Roldan, Miguel J. Mattos, Fabiana M. de Paula, Ronaldo C. B. Gryschek, Elen R. Sartori
Summary: In this study, an electrochemical immunosensor was developed for the diagnosis of strongyloidiasis using the larvae epicuticle as the antigen immobilized on a screen-printed electrode modified with graphene/ZnOQDs composite. The immunosensor showed high sensitivity and specificity, accurately detecting antibodies in positive serum samples and distinguishing strongyloidiasis from other helminthiases. The model used for classification achieved optimal precision, making it a promising tool for the diagnosis of strongyloidiasis.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Claudia Domiciano Tormena, Douglas N. Rutledge, Miroslava Rakocevic, Roy Edward Bruns, Ieda Spacino Scarminio, Gustavo Galo Marcheafave, Elis Daiane Pauli
Summary: This study investigated the metabolomic changes in coffee beans caused by the application of bioregulators using statistical mixture design and multivariate analysis. The results showed that ethanol and ethanol/dichloromethane were the most discriminating solvents. Gibberellin had the greatest differentiation compared to other bioregulators and may influence phenolic compounds. Additionally, berries harvested at different strata showed differences in metabolites.
MICROCHEMICAL JOURNAL
(2022)
Article
Food Science & Technology
Andressa Gomes de Almeida, Elis Daiane Pauli, Claudia Domiciano Tormena, Ivar Wendling, Miroslava Rakocevic, Roy Edward Bruns, Ieda Spacino Scarminio, Gustavo Galo Marcheafave
Summary: In this study, chemically differentiated shade-tolerant and high-caffeine yerba mate clones were analyzed using near-infrared spectroscopy and partial least squares-discriminant analysis. The results showed that high-caffeine clones were more sensitive to shading, indicating that caffeine synthesis is an adaptive strategy to low-light conditions.
FOOD ANALYTICAL METHODS
(2023)
Article
Chemistry, Applied
Marco Aurelio Jeanegitz Clemente, Gustavo Galo Marcheafave, Heloisa Helena Pereira Silva, Isadora Guilherme Branco, Edmilson Antonio Canesin, Ana Carolina Gomes Mantovani, Leticia Thais Chendynski, Dionisio Borsato
Summary: The presence of unsaturated esters and metallic ions in biodiesel makes it susceptible to oxidation. Adding jabuticaba peel extract can increase the induction period and decrease the reaction rate at different temperatures. The oxidation process is non-spontaneous and endothermic.
FUEL PROCESSING TECHNOLOGY
(2023)