Article
Biochemical Research Methods
Taylur P. P. Ma, Anita Izrael-Tomasevic, Rana Mroue, Hanna Budayeva, Sushant Malhotra, Ryan Raisner, Marie Evangelista, Christopher M. M. Rose, Donald S. S. Kirkpatrick, Kebing Yu
Summary: Recent advancements in targeted covalent inhibitors have garnered considerable interest for their potential applications in drug development for challenging therapeutic targets. In this study, a novel isobaric 11plex-AzidoTMT reagent and a new workflow called AT-MAPP were introduced, greatly enhancing the multiplexing ability compared to the traditional isoTOP-ABPP method. These techniques were successfully applied to identify cysteine on- and off-targets using a covalent inhibitor, demonstrating their potential in activity-based protein profiling and covalent drug development.
JOURNAL OF PROTEOME RESEARCH
(2023)
Article
Chemistry, Analytical
Chu -Fan Wang, Liang Li
Summary: Chemical isotope labeling (CIL) LC-MS is a powerful tool for metabolome analysis that offers improved coverage and accuracy. This study compares quadrupole time-of-flight (QTOF) and Orbitrap mass spectrometers for metabolite detection in CIL LC-MS. The results show that instrument type has a significant effect on metabolite detection, and combining data from different instruments can increase the number of detected peak pairs.
ANALYTICA CHIMICA ACTA
(2022)
Article
Chemistry, Applied
Junfu Ji, Xinyu Liu, Xiaosong Hu, Fang Chen, Christoph Bueschl, Rainer Schuhmacher, Andrew L. Waterhouse, Lingjun Ma
Summary: This study successfully identified quinone reaction products in wine using a stable-isotope labelling approach combined with high-resolution mass spectrometry. Different nucleophiles were found to react in white wines and red wines.
Article
Chemistry, Analytical
Ying Zhang, Bei Gao, Luis Valdiviez, Chao Zhu, Tara Gallagher, Katrine Whiteson, Oliver Fiehn
Summary: Stable isotope tracers are commonly used with gas chromatography coupled to mass spectrometry for enzyme activity and metabolic pathway studies. In this research, three commercially available instruments were used to analyze samples from a stable isotope labeling study on Rothia mucilaginosa metabolism. The study found that all three GC-MS instruments can be used for stable isotope tracing studies, with high-resolution GC-QTOF MS offering additional capabilities in identifying the chemical structures of unknown compounds.
ANALYTICAL CHEMISTRY
(2021)
Article
Pharmacology & Pharmacy
Sabrina Wohlfart, Michael Kilian, Philip Storck, Thomas Gutsmann, Klaus Brandenburg, Walter Mier
Summary: A novel method for precise quantification of Pep19-2.5 in biological samples has been developed in this study, which is crucial for the treatment of sepsis. The method utilizes mass spectrometry and labeled amino acid residues to reliably quantify the peptide content.
Review
Chemistry, Analytical
Di Yu, Lina Zhou, Xinyu Liu, Guowang Xu
Summary: The introduction of stable isotope labeling (SIL) technology has become a routine tool for functional metabolomics studies and allows for a deeper understanding of dynamic metabolic regulation in organisms. Mass spectrometry (MS) techniques have shown great vitality in this field by utilizing the different mass spectrometric characteristics between endogenous metabolites and their isotope-labeling forms. Recent advances in MS-based stable isotope-resolved metabolomics (SIRM) methods have expanded the breadth and depth of SIRM research by improving sample pretreatment, MS analysis, and data analysis. This review describes the recent progress of SIRM methods, summarizes their applications in metabolite identification, accurate quantification, and metabolic flux analysis, and discusses current limitations and challenges.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2023)
Article
Geochemistry & Geophysics
Sarah S. Zeichner, Laura Chimiak, Jamie E. Elsila, Alex L. Sessions, Jason P. Dworkin, Jose C. Aponte, John M. Eiler
Summary: The Murchison meteorite is a carbonaceous chondrite with high concentrations of amino acids. Previous studies proposed different formation mechanisms for the extraterrestrial amino acids, including Strecker synthesis, Michael addition, and reductive amination. Carbon isotope analysis of specific molecular sites reveals that the amino acids in Murchison were formed from different synthesis mechanisms, highlighting the complexity of extraterrestrial organic synthesis networks.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Biochemical Research Methods
Allyson L. Mellinger, Kenneth P. Garrard, Sitora Khodjaniyazova, Zahid N. Rabbani, Michael P. Gamcsik, David C. Muddiman
Summary: This study presents a method using multiple infusion start time protocol, stable isotope labeling technology, and high-resolution accurate mass-mass spectrometry imaging to study spatial changes in glutathione kinetics in sectioned mouse liver tissues. The results provide insights into the heterogeneity of glutathione flux in diseased and healthy tissues.
JOURNAL OF PROTEOME RESEARCH
(2022)
Article
Chemistry, Analytical
Yanxin Li, Chong Ma, Jinmao You, Shijuan Zhang
Summary: The study prepared deuterated dansylhydrazine through a one-step simple reaction, applied it to stable isotope labeling of aldehydes, enhanced quantitation accuracy, and minimized matrix effect.
MICROCHEMICAL JOURNAL
(2022)
Article
Chemistry, Analytical
Hua-Ming Xiao, Shuai Zhao, Ru-Ting Fan, Dilshad Hussain, Xian Wang
Summary: A novel analytical approach with high sensitivity and selectivity was developed for simultaneous identification and determination of short-chain fatty alcohols in seed oil and biodiesel samples. Stable isotope labeling assisted liquid chromatography-mass spectrometry (SIL-LC-MS) was successfully applied in the analysis. The results indicated that the composition of short-chain fatty alcohols changed during the simulated real-time aging process of different types of long-chain fatty acids and fatty acid methyl esters.
Article
Agriculture, Multidisciplinary
Ya-Li Bai, Cai-Feng Xiong, Xiaoming Yin, Tiantian Ye, Bao-Dong Cai, Wen-Li Song, Yu-Qi Feng
Summary: In this study, a screening strategy was established based on CIL-UPLC-HRMS for screening and identifying ABA catabolites. By proposing the structures of catabolites to be discovered and using chemical isotope labeling, ABA and its catabolites were successfully identified, including two previously unidentified catabolites.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2022)
Article
Chemistry, Analytical
Cemil Can Eylem, Ipek Baysal, Acelya Erikci, Samiye Yabanoglu-Ciftci, Song Zhang, Sedef Kir, Andre Terzic, Petras Dzeja, Emirhan Nemutlu
Summary: A new H-2[O-18] based stable isotope marker was introduced for tracking oxygen exchange rates in different segments of Krebs cycle, increasing selectivity and sensitivity. The method was successfully applied to track the cancer-induced shift in Krebs cycle dynamics in Caco-2 cells, revealing the Warburg effect. The O-18 labeling of Krebs cycle metabolites expands the techniques for monitoring cellular metabolism dynamics.
ANALYTICA CHIMICA ACTA
(2021)
Article
Biochemical Research Methods
Sarah Schleicher, Gavin O'Connor, Petra Mischnick
Summary: The methyl distribution of methyl cellulose (MC) is commonly studied by analyzing cello-oligosaccharides (COS) with ESI-MS after perdeuteromethylation. Isotope labeling with (CH3)-C-13 instead of CD3-etherified COS can provide more precise and accurate results. (CH3)-C-13 is more robust in determining the methyl distribution of MCs.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Xuan Lu, Xinli Zhu, Deying Chen, Jiahang Zhou, Jiong Yu, Jue Xie, Senxiang Yan, Hongcui Cao, Liang Li, Lanjuan Li
Summary: This study developed a workflow to investigate the metabolic changes in blood components after irradiation, identifying specific metabolites and pathways affected by irradiation. The results showed modulation of taurine and hypotaurine metabolism in plasma, as well as purine metabolism in RBCs and PBMCs. These findings offer insights into the impact of irradiation on blood metabolism.
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2021)
Article
Biochemistry & Molecular Biology
Linlin Qin, Na An, Bifeng Yuan, Quanfei Zhu, Yuqi Feng
Summary: Lipid reprogramming metabolism plays a crucial role in breast cancer growth and potential biomarkers. Fatty acid esters of hydroxy fatty acids (FAHFAs), a class of endogenous lipid metabolites, have been found to have anti-diabetic and anti-inflammatory properties. In this study, the researchers aimed to explore the relationship between FAHFAs and breast cancer by analyzing FAHFAs in tumors and adjacent normal tissues using chemical isotope labeling combined with liquid chromatography-mass spectrometry (CIL-LC-MS). Statistical analysis identified 13 altered isomers in breast cancer, which showed potential in distinguishing breast cancer tissues. Furthermore, the up-regulation of 9-oleic acid ester of hydroxy stearic acid (9-OAHSA) and down-regulation of 9-hydroxystearic acid (9-HSA) in tumors suggest that breast cancer shares similarities with colorectal cancer in terms of attenuating pro-apoptotic effects and promoting tumor survival and progression through FAHFA synthesis.
Article
Geochemistry & Geophysics
Ruoxi Zhang, Kenny Nadeau, Eduardo Amilcar Gautier, Paola Alejandra Babay, Jose Luis Ramella, Marian Virgolici, Andreea Elena Serban, Viorel Fugaru, Yoshiki Kimura, Celia Venchiarutti, Stephan Richter, Yetunde Aregbe, Zsolt Varga, Maria Wallenius, Klaus Mayer, Hana Seo, Jung Youn Choi, Csaba Tobi, Mostafa Fayek, Ryan Sharpe, Kyle M. Samperton, Victoria D. Genetti, Rachel E. Lindvall, Jeremy D. Inglis, Joanna S. Denton, Andrew A. Reinhard, Barbara Francisco, Xiaolei Zhao, William Kieser, Juan He, Ying Gao, Juris Meija, Ali El-Jaby, Lu Yang, Zoltan Mester
Summary: This study presents data from thirteen laboratories worldwide for the successful certification of uranium isotope ratios in uranium ore concentrate (UOC) certified reference materials. The study found significant variation in uranium isotope ratios among the three candidate UOC CRMs, with uncertainties of the proposed certified values superior to available reference materials.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2022)
Article
Biochemical Research Methods
Enea Pagliano, Kenny Nadeau, Ovidiu Mihai, Indumathi Pihillagawa Gedara, Zoltan Mester
Summary: This study addresses the drawbacks of liquid-based seawater certified reference materials (CRMs) by developing a salt-based seawater proxy that can be reconstituted in water. The proxy demonstrates good stability for nutrients and has reduced costs compared to traditional CRMs.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Editorial Material
Physics, Multidisciplinary
Juris Meija
Article
Chemistry, Analytical
Juris Meija, Antonio Possolo
Summary: In numerous articles and editorials published in ACQUAL, Paul De Bievre highlighted the challenges and opportunities of using statistical methods to enhance our understanding of chemical measurements. This memorial contribution revisits some of these concerns and proposes an optimistic outlook for the collaborative practice of statistical arts between chemists and statisticians.
ACCREDITATION AND QUALITY ASSURANCE
(2023)
Article
Chemistry, Analytical
J. S. F. Pereira, R. Alvarez-Fernandez Garcia, M. Corte-Rodriguez, A. Manteca, J. Bettmer, K. L. LeBlanc, Z. Mester, M. Montes-Bayon
Summary: This study used SELTM-1 as a certified reference material to compare the selenium concentrations in intra- and extracellular regions using different experimental procedures. The sequential procedure involving cell washing and freeze drying provided the most accurate results for quantifying the selenium content in both regions.
Article
Biochemical Research Methods
Michelle M. G. Chartrand, Juris Meija, Jean-Francois Helie, Paul Middlestead, Malarvili Ramalingam, Azharuddin Abd Aziz, Zoltan Mester
Summary: Stable carbon isotope ratio measurements are used to investigate the origin of vanillin. This study analyzed commercial vanillin samples and vanilla products to establish a reference range of carbon isotope delta values in different vanillin samples. Two synthetic vanillin reference materials, VANA-1 and VANB-1, were developed for calibration purposes. The certified carbon isotope delta values of VANA-1 and VANB-1 were determined through characterization and testing using nine reference materials. The results are traceable to the VPDB.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Jan Labuda, Jiri Barek, Zuzana Gajdosechova, Heidi Goenaga-Infante, Linda J. Johnston, Zoltan Mester, Sergei Shtykov
Summary: Analytical chemistry is essential for understanding the behavior of engineered nanomaterials (ENMs). Various techniques are used for isolation, identification, and quantification of nanomaterials in different samples. Physicochemical characterization of ENMs is also important for assessing their properties. This report provides an overview of ENMs, their properties, and analytical scenarios. It also evaluates the current status of nanomaterial identification and characterization for regulatory purposes and presents an overview of nanomaterial metrology and available reference materials.
PURE AND APPLIED CHEMISTRY
(2023)
Article
Chemistry, Analytical
Enea Pagliano, Elizabeth Keegan, Zsolt Varga, Kenny Nadeau, Juris Meija, Henri Wong, Christopher Vardanega, Maria Wallenius, Klaus Mayer, Chris Cochrane, Ali El-Jaby, Zoltan Mester
Summary: This study quantified the inorganic anions in three uranium ore concentrates, which is useful for nuclear forensics to establish sample provenance.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Instruments & Instrumentation
Enea Pagliano, Juris Meija
Summary: In this study, it is demonstrated that the method of standard additions can lead to unreliable results in chemical analysis when the linear calibration model is forced to fit the data. Even with a well-designed standard addition experiment, results can still be biased by 10% when relying solely on the linear model. The Joint Committee for Guides in Metrology (GUM-6) has recently stressed the importance of addressing uncertainty in measurement models, and this study shows how model averaging can offer a practical solution to account for model uncertainty in the method of standard additions.
Article
Biochemical Research Methods
Elliott J. Wright, Juris Meija, Pearse McCarron, Christopher O. Miles
Summary: In this study, O-18-labelled AZA1, AZA2, and AZA3 were prepared by reacting with (H2O)-O-18 under acidic conditions. The reaction kinetics and sites of incorporation were analyzed using LC-HRMS/MS. The results showed that AZA1 and AZA3 had four exchangeable oxygen atoms. A stable isotopically labelled internal standard method was developed using O-18-labelled AZA1 and AZA3, which showed high accuracy and reproducibility in quantifying AZAs in shellfish matrices.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Kelly L. LeBlanc, Gregoire Horndli, Marc-Antoine Bergeron, Zhigen Zhang, Patrick Denoncourt, Zoltan Mester
Summary: Selenized yeast is widely used as a source of selenium in dietary supplements and research due to its high bioavailability and formation of selenium-containing metabolites. Accurate quantitation of selenomethionine, the major form of selenium in selenized yeasts, is challenging and time-consuming. The National Research Council Canada has developed an 82-Se-enriched selenized yeast Certified Reference Material, SEEY-1, which can be used as a matrix-matched spike for the analysis of selenomethionine. SEEY-1 enables reliable analysis of Se amino acid content in under an hour compared to the conventional hydrolysis method.
ANALYTICAL CHEMISTRY
(2023)
Review
Instruments & Instrumentation
Juris Meija, Olha Bodnar, Antonio Possolo
Summary: Bayesian statistical methods are increasingly used in measurement science and offer unparalleled means to exploit all relevant and reliable measurement information. This review explores Bayesian concepts and methods in measurement science, providing practical examples of their application. The review also demonstrates that Bayesian methods are feasible using current modeling and computational techniques, and that measurement results obtained with Bayesian methods can be empirically validated.
Article
Chemistry, Analytical
Lu Yang, Brad Methven, Zoltan Mester, Juris Meija
Summary: Isotopic analysis by mass spectrometry relies on certified reference materials (CRMs) to correct instrumental isotopic fractionation. The currently recognized reference material for copper isotope ratio, SRM976, is no longer available. In this study, an independent isotope ratio measurement of a high-purity copper CRM, HICU-1, was reported and its isotopic composition was shown to be nearly identical to that of NIST SRM976.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Biochemical Research Methods
Kelly L. LeBlanc, Tantima Kumlung, Andres Suarez Priede, Paramee Kumkrong, Thippaya Junvee, Suladda Deawtong, Jorg Bettmer, Maria Montes-Bayon, Zoltan Mester
Summary: Mushrooms are considered a valuable food source due to their high protein and fiber and low fat content. This study showed that selenium-enriched Lingzhi mushrooms contained low levels of selenium, with selenomethionine being the most abundant form. The mycelium of these mushrooms showed significant selenium accumulation and the presence of selenium nanoparticles, which could have potential medicinal value.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)