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Medeiros TCT, Dabija LG, Parasecolo L, Melo IS, Moraes LAB, Ifa DR. Differentiation of the metabolic profile of actinobacteria isolated from the soil of the caatinga biome by paper spray mass spectrometry. J Mass Spectrom 2023; 58:e4956. [PMID: 37401101 DOI: 10.1002/jms.4956] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 06/05/2023] [Accepted: 06/09/2023] [Indexed: 07/05/2023]
Abstract
Paper spray mass spectrometry (PS-MS) is an ambient ionization technique that allows for rapid and direct mass spectrometry analysis for a wide range of chemical compounds due to its portability, little to no sample preparation, and cost-effective materials. As applications with this technique continue to expand, the identification and discrimination of bacteria at the strain level remain a promising avenue for researchers. Although studies in the past demonstrated the applicability of PS-MS to discriminate bacteria at the strain level, no one has reported the strain-level differentiation of actinobacteria without using solvent for PS-MS. Hence, this study demonstrates that optimization of PS-MS permits the investigation and differentiation of the metabolic profiles of actinobacteria without the need for solvents, diminishing the potential for sample contamination and consequently increasing the versatility of this technique. In doing so, strains of actinobacteria (CAAT P5-21, CAAT P5-16, CAAT 8-25, CAAT P8-92, and CAAT P11-13) were grown and transferred to produce a crude growth medium. The supernatant was used for the PS-MS analyses using a Thermo Scientific LTQ mass spectrometer. Multivariate statistical analysis, including principal component analysis (PCA) and hierarchal cluster analysis (HCA), was employed to chemically distinguish the strains of bacteria. As a result, each strain of actinobacteria could be visually differentiated based on their metabolic profile. These findings demonstrate the practicability of using a liquid medium as an alternative to many other organic solvents when analyzing bacteria, making PS-MS a crucial addition to a microbiologist's research toolkit.
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Affiliation(s)
- Talita C T Medeiros
- Departament of Chemistry, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, University of São Paulo, São Paulo, Brazil
- Department of Chemistry, York University, Toronto, Ontario, Canada
| | | | | | - Itamar S Melo
- EMBRAPA, Empresa Brasileira de Pesquisa Agropecuária, Jaguariúna, Brazil
| | - Luiz Alberto B Moraes
- Departament of Chemistry, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Demian R Ifa
- Department of Chemistry, York University, Toronto, Ontario, Canada
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Sousa MDB, Pereira ML, Cruz FPN, Romano LH, Albuquerque YR, Correia RO, Oliveira FM, Primo FL, Baptista-Neto Á, Sousa CP, Anibal FF, Moraes LAB, Badino AC. Red biocolorant from endophytic Talaromyces minnesotensis: production, properties, and potential applications. Appl Microbiol Biotechnol 2023; 107:3699-3716. [PMID: 37083969 DOI: 10.1007/s00253-023-12491-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 03/15/2023] [Accepted: 03/18/2023] [Indexed: 04/22/2023]
Abstract
Fungal colorants are gradually entering the global color market, given their advantages of being less harmful to human health, as well as having greater stability and biotechnological potential, compared to other natural sources. The present work concerns the isolation and identification of an endophytic filamentous fungus, together with the chemical characterization and assessment of the fluorescence, toxicity, stability, and application potential of its synthesized red colorant. The endophytic fungus was isolated from Hymenaea courbaril, a tree from the Brazilian savannah, and was identified as Talaromyces minnesotensis by phenotypic and genotypic characterization. Submerged cultivation of the fungus resulted in the production of approximately 12 AU500 of a red biocolorant which according to LC-DAD-MS analysis is characterized by being a complex mixture of molecules of the azaphilone class. Regarding cytotoxicity assays, activity against human hepatoblastoma (HepG2) cells was only observed at concentrations above 5.0 g L-1, while antimicrobial effects against pathogenic bacteria and yeast occurred at concentrations above 50.0 g L-1. The biocolorant showed high stability at neutral pH values and low temperatures (10 to 20 °C) and high half-life values (t1/2), which indicates potential versatility for application in different matrices, as observed in tests using detergent, gelatin, enamel, paint, and fabrics. The results demonstrated that the biocolorant synthesized by Talaromyces minnesotensis has potential for future biotechnological applications. KEY POINTS: • An endophytic fungus, which was isolated and identified, synthesize a red colorant. • The colorant showed fluorescence property, low toxicity, and application potential. • The red biocolorant was highly stable at pH 8.0 and temperatures below 20°C.
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Affiliation(s)
- Marina D B Sousa
- Graduate Program of Chemical Engineering, Department of Chemical Engineering, Federal University of São Carlos, C.P. 676, São Carlos, São Paulo, 13565-905, Brazil
| | - Murilo L Pereira
- Chemical Engineering Undergraduate Course, Department of Chemical Engineering, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Felipe P N Cruz
- Graduate Program of Biotechnology, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
- Laboratory of Microbiology and Biomolecules - LaMiB, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Luis H Romano
- Graduate Program of Biotechnology, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
- Laboratory of Microbiology and Biomolecules - LaMiB, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Yulli R Albuquerque
- Graduate Program of Biotechnology, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
- Laboratory of Inflammation and Infectious Diseases - LIDI, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Ricardo O Correia
- Graduate Program of Biotechnology, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
- Laboratory of Inflammation and Infectious Diseases - LIDI, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Fernanda M Oliveira
- Graduate Program of Chemistry, Laboratory of Mass Spectrometry Applied to Natural Products, Chemistry Department, School of Philosophy, Sciences and Languages, University of São Paulo, Ribeirão Preto, Brazil
| | - Fernando L Primo
- Department of Engineering of Bioprocess and Biotechnology, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, São Paulo, 14800-903, Brazil
| | - Álvaro Baptista-Neto
- Department of Engineering of Bioprocess and Biotechnology, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, São Paulo, 14800-903, Brazil
| | - Cristina P Sousa
- Graduate Program of Biotechnology, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
- Laboratory of Microbiology and Biomolecules - LaMiB, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Fernanda F Anibal
- Graduate Program of Biotechnology, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
- Laboratory of Inflammation and Infectious Diseases - LIDI, Department of Morphology and Pathology, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Luiz Alberto B Moraes
- Graduate Program of Chemistry, Laboratory of Mass Spectrometry Applied to Natural Products, Chemistry Department, School of Philosophy, Sciences and Languages, University of São Paulo, Ribeirão Preto, Brazil
| | - Alberto C Badino
- Graduate Program of Chemical Engineering, Department of Chemical Engineering, Federal University of São Carlos, C.P. 676, São Carlos, São Paulo, 13565-905, Brazil.
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Heinen PR, Bauermeister A, Ribeiro LF, Messias JM, Almeida PZ, Moraes LAB, Vargas-Rechia CG, de Oliveira AHC, Ward RJ, Filho EXF, Kadowaki MK, Jorge JA, Polizeli MLTM. GH11 xylanase from Aspergillus tamarii Kita: Purification by one-step chromatography and xylooligosaccharides hydrolysis monitored in real-time by mass spectrometry. Int J Biol Macromol 2017; 108:291-299. [PMID: 29191425 DOI: 10.1016/j.ijbiomac.2017.11.150] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 11/22/2017] [Accepted: 11/23/2017] [Indexed: 01/12/2023]
Abstract
The present study describes the one-step purification and biochemical characterization of an endo-1,4-β-xylanase from Aspergillus tamarii Kita. Extracellular xylanase was purified to homogeneity 7.43-fold through CM-cellulose. Enzyme molecular weight and pI were estimated to be 19.5kDa and 8.5, respectively. The highest activity of the xylanase was obtained at 60°C and it was active over a broad pH range (4.0-9.0), with maximal activity at pH 5.5. The enzyme was thermostable at 50°C, retaining more than 70% of its initial activity for 480min. The K0.5 and Vmax values on beechwood xylan were 8.13mg/mL and 1,330.20μmol/min/mg of protein, respectively. The ions Ba2+ and Ni2+, and the compounds β-mercaptoethanol and DTT enhanced xylanase activity, while the heavy metals (Co2+, Cu2+, Hg+, Pb2+ and Zn2+) strongly inhibited the enzyme, at 5mM. Enzymatic hydrolysis of xylooligosaccharides monitored in real-time by mass spectrometer showed that the shortest xylooligosaccharide more efficiently hydrolyzed by A. tamarii Kita xylanase corresponded to xylopentaose. In agreement, HPLC analyzes did not detect xylopentaose among the hydrolysis products of xylan. Therefore, this novel GH11 endo-xylanase displays a series of physicochemical properties favorable to its application in the food, feed, pharmaceutical and paper industries.
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Affiliation(s)
- P R Heinen
- Departamento de Bioquímica e Imunologia - Faculdade de Medicina de Ribeirão Preto - Universidade de São Paulo, Brazil
| | - A Bauermeister
- Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Brazil
| | - L F Ribeiro
- Department of Chemical and Biomolecular Engineering - Johns Hopkins University, USA
| | - J M Messias
- Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Brazil
| | - P Z Almeida
- Departamento de Bioquímica e Imunologia - Faculdade de Medicina de Ribeirão Preto - Universidade de São Paulo, Brazil
| | - L A B Moraes
- Departamento de Química - Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Universidade de São Paulo, Brazil
| | - C G Vargas-Rechia
- Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Brazil
| | - A H C de Oliveira
- Departamento de Química - Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Universidade de São Paulo, Brazil
| | - R J Ward
- Departamento de Química - Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Universidade de São Paulo, Brazil
| | - E X F Filho
- Departamento de Biologia Celular, Universidade de Brasília, Brasília, DF, Brazil
| | - M K Kadowaki
- Centro de Ciências Médicas e Farmacêuticas - UNIOESTE - Cascavel, Paraná, Brazil
| | - J A Jorge
- Departamento de Biologia - Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Universidade de São Paulo, Brazil
| | - M L T M Polizeli
- Departamento de Biologia - Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Universidade de São Paulo, Brazil.
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Damacena-Angelis C, Oliveira-Paula GH, Pinheiro LC, Crevelin EJ, Portella RL, Moraes LAB, Tanus-Santos JE. Nitrate decreases xanthine oxidoreductase-mediated nitrite reductase activity and attenuates vascular and blood pressure responses to nitrite. Redox Biol 2017; 12:291-299. [PMID: 28285190 PMCID: PMC5345972 DOI: 10.1016/j.redox.2017.03.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 02/27/2017] [Accepted: 03/03/2017] [Indexed: 12/20/2022] Open
Abstract
Nitrite and nitrate restore deficient endogenous nitric oxide (NO) production as they are converted back to NO, and therefore complement the classic enzymatic NO synthesis. Circulating nitrate and nitrite must cross membrane barriers to produce their effects and increased nitrate concentrations may attenuate the nitrite influx into cells, decreasing NO generation from nitrite. Moreover, xanthine oxidoreductase (XOR) mediates NO formation from nitrite and nitrate. However, no study has examined whether nitrate attenuates XOR-mediated NO generation from nitrite. We hypothesized that nitrate attenuates the vascular and blood pressure responses to nitrite either by interfering with nitrite influx into vascular tissue, or by competing with nitrite for XOR, thus inhibiting XOR-mediated NO generation. We used two independent vascular function assays in rats (aortic ring preparations and isolated mesenteric arterial bed perfusion) to examine the effects of sodium nitrate on the concentration-dependent responses to sodium nitrite. Both assays showed that nitrate attenuated the vascular responses to nitrite. Conversely, the aortic responses to the NO donor DETANONOate were not affected by sodium nitrate. Further confirming these results, we found that nitrate attenuated the acute blood pressure lowering effects of increasing doses of nitrite infused intravenously in freely moving rats. The possibility that nitrate could compete with nitrite and decrease nitrite influx into cells was tested by measuring the accumulation of nitrogen-15-labeled nitrite (15N-nitrite) by aortic rings using ultra-performance liquid chromatography tandem mass-spectrometry (UPLC-MS/MS). Nitrate exerted no effect on aortic accumulation of 15N-nitrite. Next, we used chemiluminescence-based NO detection to examine whether nitrate attenuates XOR-mediated nitrite reductase activity. Nitrate significantly shifted the Michaelis Menten saturation curve to the right, with a 3-fold increase in the Michaelis constant. Together, our results show that nitrate inhibits XOR-mediated NO production from nitrite, and this mechanism may explain how nitrate attenuates the vascular and blood pressure responses to nitrite. The anions nitrite and nitrate are converted back to NO under certain conditions. Xanthine oxidoreductase (XOR) mediates NO formation from nitrite and nitrate. Increased nitrate concentrations attenuate XOR-mediated NO generation from nitrite. This may explain how nitrate attenuates the vascular and blood pressure responses to nitrite.
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Affiliation(s)
- Célio Damacena-Angelis
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas, Campinas, São Paulo, Brazil
| | - Gustavo H Oliveira-Paula
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Lucas C Pinheiro
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Eduardo J Crevelin
- Department of Chemistry, School of Philosophy, Sciences and Languages, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Rafael L Portella
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Luiz Alberto B Moraes
- Department of Chemistry, School of Philosophy, Sciences and Languages, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Jose E Tanus-Santos
- Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, SP, Brazil.
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Silva-Stenico ME, Cantúsio Neto R, Alves IR, Moraes LAB, Shishido TK, Fiore MF. Hepatotoxin microcystin-LR extraction optimization. J BRAZIL CHEM SOC 2009. [DOI: 10.1590/s0103-50532009000300019] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Benassi M, Moraes LAB, Cabrini LG, Dias LC, Aguilar AM, Romeiro GA, Eberlin LS, Eberlin MN. Recognition of Cyclic, Acyclic, Exocyclic, and Spiro Acetals via Structurally Diagnostic Ion/Molecule Reactions with the (CH3)2N-C+═O Acylium Ion. J Org Chem 2008; 73:5549-57. [DOI: 10.1021/jo8008269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Mario Benassi
- ThoMSon Mass Spectrometry Laboratory, State University of Campinas, Campinas-SP, Brazil 13083-970, University of São Paulo, Ribeirão Preto, SP, Brazil, Synthetic Organic Chemistry Laboratory, State University of Campinas, Campinas-SP, Brazil, Federal University of São Paulo, Diadema Campus, 09972-270, Diadema, SP, Brazil, and Institute of Chemistry, Fluminense Federal University, Rio de Janeiro, RJ, Brazil
| | - Luiz Alberto B. Moraes
- ThoMSon Mass Spectrometry Laboratory, State University of Campinas, Campinas-SP, Brazil 13083-970, University of São Paulo, Ribeirão Preto, SP, Brazil, Synthetic Organic Chemistry Laboratory, State University of Campinas, Campinas-SP, Brazil, Federal University of São Paulo, Diadema Campus, 09972-270, Diadema, SP, Brazil, and Institute of Chemistry, Fluminense Federal University, Rio de Janeiro, RJ, Brazil
| | - Liliane G. Cabrini
- ThoMSon Mass Spectrometry Laboratory, State University of Campinas, Campinas-SP, Brazil 13083-970, University of São Paulo, Ribeirão Preto, SP, Brazil, Synthetic Organic Chemistry Laboratory, State University of Campinas, Campinas-SP, Brazil, Federal University of São Paulo, Diadema Campus, 09972-270, Diadema, SP, Brazil, and Institute of Chemistry, Fluminense Federal University, Rio de Janeiro, RJ, Brazil
| | - Luiz Carlos Dias
- ThoMSon Mass Spectrometry Laboratory, State University of Campinas, Campinas-SP, Brazil 13083-970, University of São Paulo, Ribeirão Preto, SP, Brazil, Synthetic Organic Chemistry Laboratory, State University of Campinas, Campinas-SP, Brazil, Federal University of São Paulo, Diadema Campus, 09972-270, Diadema, SP, Brazil, and Institute of Chemistry, Fluminense Federal University, Rio de Janeiro, RJ, Brazil
| | - Andrea M. Aguilar
- ThoMSon Mass Spectrometry Laboratory, State University of Campinas, Campinas-SP, Brazil 13083-970, University of São Paulo, Ribeirão Preto, SP, Brazil, Synthetic Organic Chemistry Laboratory, State University of Campinas, Campinas-SP, Brazil, Federal University of São Paulo, Diadema Campus, 09972-270, Diadema, SP, Brazil, and Institute of Chemistry, Fluminense Federal University, Rio de Janeiro, RJ, Brazil
| | - Gilberto A. Romeiro
- ThoMSon Mass Spectrometry Laboratory, State University of Campinas, Campinas-SP, Brazil 13083-970, University of São Paulo, Ribeirão Preto, SP, Brazil, Synthetic Organic Chemistry Laboratory, State University of Campinas, Campinas-SP, Brazil, Federal University of São Paulo, Diadema Campus, 09972-270, Diadema, SP, Brazil, and Institute of Chemistry, Fluminense Federal University, Rio de Janeiro, RJ, Brazil
| | - Livia S. Eberlin
- ThoMSon Mass Spectrometry Laboratory, State University of Campinas, Campinas-SP, Brazil 13083-970, University of São Paulo, Ribeirão Preto, SP, Brazil, Synthetic Organic Chemistry Laboratory, State University of Campinas, Campinas-SP, Brazil, Federal University of São Paulo, Diadema Campus, 09972-270, Diadema, SP, Brazil, and Institute of Chemistry, Fluminense Federal University, Rio de Janeiro, RJ, Brazil
| | - Marcos N. Eberlin
- ThoMSon Mass Spectrometry Laboratory, State University of Campinas, Campinas-SP, Brazil 13083-970, University of São Paulo, Ribeirão Preto, SP, Brazil, Synthetic Organic Chemistry Laboratory, State University of Campinas, Campinas-SP, Brazil, Federal University of São Paulo, Diadema Campus, 09972-270, Diadema, SP, Brazil, and Institute of Chemistry, Fluminense Federal University, Rio de Janeiro, RJ, Brazil
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Michelin M, Ruller R, Ward RJ, Moraes LAB, Jorge JA, Terenzi HF, Polizeli MDLTM. Purification and biochemical characterization of a thermostable extracellular glucoamylase produced by the thermotolerant fungus Paecilomyces variotii. J Ind Microbiol Biotechnol 2007; 35:17-25. [DOI: 10.1007/s10295-007-0261-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2007] [Accepted: 09/18/2007] [Indexed: 11/29/2022]
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Nazare P, Massaroti P, Duarte LF, Campos DR, Marchioretto MAM, Bernasconi G, Calafatti S, Barros FAP, Meurer EC, Pedrazzoli J, Moraes LAB. Validated method for determination of bromopride in human plasma by liquid chromatography--electrospray tandem mass spectrometry: application to the bioequivalence study. J Mass Spectrom 2005; 40:1197-202. [PMID: 16127659 DOI: 10.1002/jms.898] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A simple, sensitive and specific liquid chromatography-tandem mass spectrometry method for the quantification of bromopride I in human plasma is presented. Sample preparation consisted of the addition of procainamide II as the internal standard, liquid-liquid extraction in alkaline conditions using hexane-ethyl acetate (1 : 1, v/v) as the extracting solvent, followed by centrifugation, evaporation of the solvent and sample reconstitution in acetonitrile. Both I and II (internal standard, IS) were analyzed using a C18 column and the mobile-phase acetonitrile-water (formic acid 0.1%). The eluted compounds were monitored using electrospray tandem mass spectrometry. The analyses were carried out by multiple reaction monitoring (MRM) using the parent-to-daughter combinations of m/z 344.20 > 271.00 and m/z 236.30 > 163.10. The areas of peaks from analyte and IS were used for quantification of I. The achieved limit of quantification was 1.0 ng/ml and the assay exhibited a linear dynamic range of 1-100.0 ng/ml and gave a correlation coefficient (r) of 0.995 or better. Validation results on linearity, specificity, accuracy, precision and stability, as well as application to the analysis of samples taken up to 24 h after oral administration of 10 mg of I in healthy volunteers demonstrated the applicability to bioequivalence studies.
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Affiliation(s)
- P Nazare
- Clinical Pharmacology and Gastroenterology Unit, São Francisco University Medical School, Av. Sao Francisco de Assis 218, 12916-900 Bragança Paulista, SP, Brazil
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Massaroti P, Moraes LAB, Marchioretto MAM, Cassiano NM, Bernasconi G, Calafatti SA, Barros FAP, Meurer EC, Pedrazzoli J. Development and validation of a selective and robust LC-MS/MS method for quantifying amlodipine in human plasma. Anal Bioanal Chem 2005; 382:1049-54. [PMID: 15891869 DOI: 10.1007/s00216-005-3227-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2004] [Revised: 03/16/2005] [Accepted: 03/24/2005] [Indexed: 10/25/2022]
Abstract
A liquid chromatographic-tandem mass spectrometric method (LC-MS/MS) for quantifying amlodipine in human plasma was developed and validated. Sample preparation was based on liquid-liquid extraction using NaOH and a mixture of ethyl acetate/hexane (80/20; v/v). Chromatography was performed on a C-18 analytical column and the retention times were 1.9 and 3.0 min for amlodipine and nimodipine (internal standard), respectively. The ionization was optimized using ESI(+) and enhanced selectivity was achieved using tandem mass spectrometric analysis via two MRM functions, 409 --> 238 and 418 --> 343 for amlodipine and nimodipine. The calibration curve ranged from 0.2 to 20.0 ng/mL. The inter-day precision and accuracy and the relative standard deviation (RSD) were <15%. The analyte was shown to be stable over the time-scale of the whole procedure. The robustness of the method was demonstrated by the good reproducibility of the results obtained during the analysis of clinical samples.
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Affiliation(s)
- P Massaroti
- Clinical Pharmacology and Gastroenterology Unit, São Francisco University Medical School, Av. Sao Francisco de Assis 218, 12916-900 Bragança Paulista, SP, Brazil
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Tomazela DM, Moraes LAB, Pilli RA, Eberlin MN, D'Oca MGM. Mannich-type reactions in the gas-phase: the addition of enol silanes to cyclic N-acyliminium ions. J Org Chem 2002; 67:4652-8. [PMID: 12098272 DOI: 10.1021/jo016382o] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The intrinsic gas-phase reactivity of cyclic N-acyliminium ions in Mannich-type reactions with the parent enol silane, vinyloxytrimethylsilane, has been investigated by double- and triple-stage pentaquadrupole mass spectrometric experiments. Remarkably distinct reactivities are observed for cyclic N-acyliminium ions bearing either endocyclic or exocyclic carbonyl groups. NH-Acyliminium ions with endocyclic carbonyl groups locked in s-trans forms participate in a novel tandem N-acyliminium ion reaction: the nascent adduct formed by simple addition is unstable and rearranges by intramolecular trimethylsilyl cation shift to the ring nitrogen, and an acetaldehyde enol molecule is eliminated. An NSi(CH(3))(3)-acyliminium ion is formed, and this intermediate ion reacts with a second molecule of vinyloxytrimethylsilane by simple addition to form a stable acyclic adduct. N-Acyl and N,N-diacyliminium ions with endocyclic carbonyl groups, for which the s-cis conformation is favored, react distinctively by mono polar [4(+) + 2] cycloaddition yielding stable, ressonance-stabilized cycloadducts. Product ions were isolated via mass-selection and structurally characterized by triple-stage mass spectrometric experiments. B3LYP/6-311G(d,p) calculations corroborate the proposed reaction mechanisms.
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Moraes LAB, Eberlin MN. Structurally diagnostic ion-molecule reactions: acylium ions with alpha-, beta- and gamma-hydroxy ketones. J Mass Spectrom 2002; 37:162-168. [PMID: 11857760 DOI: 10.1002/jms.270] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Gas-phase reactions of four acylium ions and a thioacylium ion with three isomeric alpha-, beta- and gamma-hydroxy ketones are performed by pentaquadrupole mass spectrometric experiments. Novel structurally diagnostic reactions are observed, and found to correlate directly with interfunctional group separation. All five ions tested (CH(3)CO(+), CH(2)(double bond)CHCO(+), PhCO(+), (CH(3))(2)NCO(+) and (CH(3))(2)NCS(+)) react with the gamma-hydroxy ketone (5-hydroxy-2-pentanone) to form nearly exclusively a cyclic oxonium ion of m/z 85 that formally arises from hydroxy anion abstraction. With the beta-hydroxy ketone (4-hydroxy-2-pentanone), CH(2)(double bond)CHCO(+), PhCO(+) and (CH(3))(2)NCO(+) form adducts that undergo fast cyclization via intramolecular water displacement, yielding resonance-stabilized cyclic dioxinylium ions. With the alpha-hydroxy ketone (3-hydroxy-3-methyl-2-butanone), PhCO(+), (CH(3))(2)NCO(+) and (CH(3))(2)NCS(+) form stable adducts. Evidence that these adducts display cyclic structures is provided by the triple-stage mass spectra of the (CH(3))(2)NCS(+) adduct; it dissociates to (CH(3))(2)NCO(+) via a characteristic reaction-dissociation pathway that promotes sulfur-by-oxygen replacement. If cyclizations are assumed to occur with intramolecular anchimeric assistance, relationships between structure and reactivity are easily recognized.
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Affiliation(s)
- L A B Moraes
- Institute of Chemistry, State University of Campinas-UNICAMP, CP 6154, 13083-970 Campinas, SP, Brazil
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Moraes LAB, Eberlin MN, Laali KK. Gas-Phase Synthesis and Characterization of an Azaphosphirenium Ion: The First N,P-Analogue of the Aromatic Cyclopropenyl Cation. Organometallics 2001. [DOI: 10.1021/om010458p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luiz Alberto B. Moraes
- State University of Campinas-UNICAMP, Institute of Chemistry, CP6154 13083-970 Campinas, São Paulo, Brazil
| | - Marcos N. Eberlin
- State University of Campinas-UNICAMP, Institute of Chemistry, CP6154 13083-970 Campinas, São Paulo, Brazil
| | - Kenneth K. Laali
- Department of Chemistry, Kent State University, Kent, Ohio 44260
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Affiliation(s)
- Fabio C. Gozzo
- Contribution from the Institute of Chemistry, State University of Campinas-UNICAMP, CP 6154, 13083-970 Campinas, SP Brazil, and Department of Chemistry, Kent State University, Kent, Ohio 44242
| | - Luiz Alberto B. Moraes
- Contribution from the Institute of Chemistry, State University of Campinas-UNICAMP, CP 6154, 13083-970 Campinas, SP Brazil, and Department of Chemistry, Kent State University, Kent, Ohio 44242
| | - Marcos N. Eberlin
- Contribution from the Institute of Chemistry, State University of Campinas-UNICAMP, CP 6154, 13083-970 Campinas, SP Brazil, and Department of Chemistry, Kent State University, Kent, Ohio 44242
| | - Kenneth K. Laali
- Contribution from the Institute of Chemistry, State University of Campinas-UNICAMP, CP 6154, 13083-970 Campinas, SP Brazil, and Department of Chemistry, Kent State University, Kent, Ohio 44242
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Affiliation(s)
- Luiz Alberto B. Moraes
- Contribution from the Institute of Chemistry, State University of CampinasUNICAMP, CP 6154 13083-970 Campinas, SP Brazil
| | - Marcos N. Eberlin
- Contribution from the Institute of Chemistry, State University of CampinasUNICAMP, CP 6154 13083-970 Campinas, SP Brazil
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Mendes MA, Moraes LAB, Sparrapan R, Eberlin MN, Kostiainen R, Kotiaho T. Oxygen Atom Transfer to Positive Ions: A Novel Reaction of Ozone in the Gas Phase. J Am Chem Soc 1998. [DOI: 10.1021/ja971251j] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maria Anita Mendes
- Contribution from the Institute of Chemistry, State University of Campinas, UNICAMP CP6154, 13083-970 Campinas, SP Brazil, Department of Pharmacy, Division of Pharmaceutical Chemistry, P.O. Box 56 (Viikinkaari 5), 00014 University of Helsinki, Helsinki, Finland, and VTT Chemical Technology, P.O. Box 140, FIN-02044 VTT, Espoo, Finland
| | - Luiz Alberto B. Moraes
- Contribution from the Institute of Chemistry, State University of Campinas, UNICAMP CP6154, 13083-970 Campinas, SP Brazil, Department of Pharmacy, Division of Pharmaceutical Chemistry, P.O. Box 56 (Viikinkaari 5), 00014 University of Helsinki, Helsinki, Finland, and VTT Chemical Technology, P.O. Box 140, FIN-02044 VTT, Espoo, Finland
| | - Regina Sparrapan
- Contribution from the Institute of Chemistry, State University of Campinas, UNICAMP CP6154, 13083-970 Campinas, SP Brazil, Department of Pharmacy, Division of Pharmaceutical Chemistry, P.O. Box 56 (Viikinkaari 5), 00014 University of Helsinki, Helsinki, Finland, and VTT Chemical Technology, P.O. Box 140, FIN-02044 VTT, Espoo, Finland
| | - Marcos N. Eberlin
- Contribution from the Institute of Chemistry, State University of Campinas, UNICAMP CP6154, 13083-970 Campinas, SP Brazil, Department of Pharmacy, Division of Pharmaceutical Chemistry, P.O. Box 56 (Viikinkaari 5), 00014 University of Helsinki, Helsinki, Finland, and VTT Chemical Technology, P.O. Box 140, FIN-02044 VTT, Espoo, Finland
| | - Risto Kostiainen
- Contribution from the Institute of Chemistry, State University of Campinas, UNICAMP CP6154, 13083-970 Campinas, SP Brazil, Department of Pharmacy, Division of Pharmaceutical Chemistry, P.O. Box 56 (Viikinkaari 5), 00014 University of Helsinki, Helsinki, Finland, and VTT Chemical Technology, P.O. Box 140, FIN-02044 VTT, Espoo, Finland
| | - Tapio Kotiaho
- Contribution from the Institute of Chemistry, State University of Campinas, UNICAMP CP6154, 13083-970 Campinas, SP Brazil, Department of Pharmacy, Division of Pharmaceutical Chemistry, P.O. Box 56 (Viikinkaari 5), 00014 University of Helsinki, Helsinki, Finland, and VTT Chemical Technology, P.O. Box 140, FIN-02044 VTT, Espoo, Finland
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Moraes LAB, Gozzo FC, Eberlin MN, Vainiotalo P. Transacetalization with Acylium Ions. A Structurally Diagnostic Ion/Molecule Reaction for Cyclic Acetals and Ketals in the Gas Phase. J Org Chem 1997. [DOI: 10.1021/jo970116m] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luiz Alberto B. Moraes
- State University of Campinas, UNICAMP, Institute of Chemistry CP6154, 13083-970 Campinas, SP Brazil
| | - Fábio C. Gozzo
- State University of Campinas, UNICAMP, Institute of Chemistry CP6154, 13083-970 Campinas, SP Brazil
| | - Marcos N. Eberlin
- State University of Campinas, UNICAMP, Institute of Chemistry CP6154, 13083-970 Campinas, SP Brazil
| | - Pirjo Vainiotalo
- Department of Chemistry, University of Joensuu, P.O. Box 111, FIN-80101 Joensuu, Finland
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Affiliation(s)
- Luiz Alberto B. Moraes
- State University of Campinas-UNICAMP, Institute of Chemistry CP6154, 13083-970 Campinas, SP, Brazil
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