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Molina Torres MA, Pachón Gómez EM, Fernández MA, Veglia AV, Pacioni NL. Role of a cystine-based Gemini surfactant ligand in the synthesis of catalytic active silver nanoparticles. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.03.168] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Bravo I, Revenga-Parra M, Pariente F, Lorenzo E. Reagent-Less and Robust Biosensor for Direct Determination of Lactate in Food Samples. SENSORS 2017; 17:s17010144. [PMID: 28098753 PMCID: PMC5298717 DOI: 10.3390/s17010144] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 12/20/2016] [Accepted: 01/11/2017] [Indexed: 11/23/2022]
Abstract
Lactic acid is a relevant analyte in the food industry, since it affects the flavor, freshness, and storage quality of several products, such as milk and dairy products, juices, or wines. It is the product of lactose or malo-lactic fermentation. In this work, we developed a lactate biosensor based on the immobilization of lactate oxidase (LOx) onto N,N′-Bis(3,4-dihydroxybenzylidene) -1,2-diaminobenzene Schiff base tetradentate ligand-modified gold nanoparticles (3,4DHS–AuNPs) deposited onto screen-printed carbon electrodes, which exhibit a potent electrocatalytic effect towards hydrogen peroxide oxidation/reduction. 3,4DHS–AuNPs were synthesized within a unique reaction step, in which 3,4DHS acts as reducing/capping/modifier agent for the generation of stable colloidal suspensions of Schiff base ligand–AuNPs assemblies of controlled size. The ligand—in addition to its reduction action—provides a robust coating to gold nanoparticles and a catalytic function. Lactate oxidase (LOx) catalyzes the conversion of l-lactate to pyruvate in the presence of oxygen, producing hydrogen peroxide, which is catalytically oxidized at 3,4DHS–AuNPs modified screen-printed carbon electrodes at +0.2 V. The measured electrocatalytic current is directly proportional to the concentration of peroxide, which is related to the amount of lactate present in the sample. The developed biosensor shows a detection limit of 2.6 μM lactate and a sensitivity of 5.1 ± 0.1 μA·mM−1. The utility of the device has been demonstrated by the determination of the lactate content in different matrixes (white wine, beer, and yogurt). The obtained results compare well to those obtained using a standard enzymatic-spectrophotometric assay kit.
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Affiliation(s)
- Iria Bravo
- Departamento de Química Analítica y Análisis Instrumental, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Faraday, 9, Campus UAM, Cantoblanco, 28049 Madrid, Spain.
| | - Mónica Revenga-Parra
- Departamento de Química Analítica y Análisis Instrumental, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Faraday, 9, Campus UAM, Cantoblanco, 28049 Madrid, Spain.
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain.
| | - Félix Pariente
- Departamento de Química Analítica y Análisis Instrumental, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain.
| | - Encarnación Lorenzo
- Departamento de Química Analítica y Análisis Instrumental, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Faraday, 9, Campus UAM, Cantoblanco, 28049 Madrid, Spain.
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain.
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Reyes-Gutiérrez PE, Kapal T, Klepetářová B, Šaman D, Pohl R, Zawada Z, Kužmová E, Hájek M, Teplý F. Structural revisions of small molecules reported to cross-link G-quadruplex DNA in vivo reveal a repetitive assignment error in the literature. Sci Rep 2016; 6:23499. [PMID: 27005677 PMCID: PMC4804300 DOI: 10.1038/srep23499] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 02/02/2016] [Indexed: 11/09/2022] Open
Abstract
Two molecules of mistaken identity are addressed. Uncovering these assignment errors led us to formulate more general guidelines about additional misassignments in cases of published bis-imines derived from 1,2-phenylenediamine and hydroxybenzaldehydes having no substituent in ortho-positions. The main purpose of this article is to highlight this repetitive assignment error in the literature and thus increase the likelihood of correct assignments in future papers.
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Affiliation(s)
- Paul E Reyes-Gutiérrez
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Tomáš Kapal
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Blanka Klepetářová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - David Šaman
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Zbigniew Zawada
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Erika Kužmová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Miroslav Hájek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Filip Teplý
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
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Abad JM, Bravo I, Pariente F, Lorenzo E. Multi-tasking Schiff base ligand: a new concept of AuNPs synthesis. Anal Bioanal Chem 2016; 408:2329-38. [PMID: 26922338 DOI: 10.1007/s00216-016-9329-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 01/04/2016] [Accepted: 01/12/2016] [Indexed: 11/26/2022]
Abstract
Multi-tasking 3,4-dihydroxysalophen Schiff base tetradentate ligand (3,4-DHS) as reductant, stabilizer, and catalyst in a new concept of gold nanoparticles (AuNPs) synthesis is demonstrated. 3,4-DHS is able to reduce HAuCl4 in water, acting also as capping agent for the generation of stable colloidal suspensions of Schiff base ligand-AuNPs assemblies of controlled size by providing a robust coating to AuNPs, within a unique reaction step. Once deposited on carbon electrodes, 3,4-DHS-AuNPs assemblies show a potent electrocatalytic effect towards hydrazine oxidation and hydrogen peroxide oxidation/reduction.
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Affiliation(s)
- Jose Maria Abad
- Department of Analytical Chemistry, Universidad Autónoma de Madrid, Calle Francisco Tomás y Valiente 7, 28049, Madrid, Spain
| | - Iria Bravo
- Department of Analytical Chemistry, Universidad Autónoma de Madrid, Calle Francisco Tomás y Valiente 7, 28049, Madrid, Spain
- IMDEA Nanociencia, Calle Faraday 9, 28049, Madrid, Spain
| | - Felix Pariente
- Department of Analytical Chemistry, Universidad Autónoma de Madrid, Calle Francisco Tomás y Valiente 7, 28049, Madrid, Spain
- IMDEA Nanociencia, Calle Faraday 9, 28049, Madrid, Spain
| | - Encarnación Lorenzo
- Department of Analytical Chemistry, Universidad Autónoma de Madrid, Calle Francisco Tomás y Valiente 7, 28049, Madrid, Spain.
- IMDEA Nanociencia, Calle Faraday 9, 28049, Madrid, Spain.
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Sanskriti I, Upadhyay KK. Silver nanoparticles as highly efficient and selective optical probe for sulphide via dendrimer formation in aqueous medium. RSC Adv 2016. [DOI: 10.1039/c5ra25625a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
1-[(4-Nitrophenyl)azo]-2-naphthol capped AgNPs were evaluated as a colorimetric sensor for S2− in aqueous medium over pH 4 to 10 with a nanomolar detection limit. The TEM, SEM and AFM images revealed the transition of spherical AgNPs into dendrimers.
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Affiliation(s)
- Isha Sanskriti
- Department of Chemistry (Centre of Advanced Study)
- Faculty of Science
- Banaras Hindu University
- Varanasi 221005
- India
| | - K. K. Upadhyay
- Department of Chemistry (Centre of Advanced Study)
- Faculty of Science
- Banaras Hindu University
- Varanasi 221005
- India
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Rani JS, Ramakrishnan V. Interaction of Schiff base ligand with tin dioxide nanoparticles: optical studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 114:170-174. [PMID: 23770505 DOI: 10.1016/j.saa.2013.05.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Revised: 05/13/2013] [Accepted: 05/14/2013] [Indexed: 06/02/2023]
Abstract
Interaction between 1,4 Bis ((2-Methyl) thio) Phenylamino methyl benzene (BMTPMB) Schiff base with tin dioxide nanoparticles (SnO2 NPs) of various concentrations in methanol have been studied using UV-Visible and Fluorescence spectroscopic techniques. The low value of Stern-Volmer quenching constant and non-linear plot of Benesi-Hildebrand equation suggests the less affinity of SnO2 NPs towards the adsorption of BMTPMB Schiff base. The Scott equation has been employed to determine molar absorptivity of the Schiff base-NPs system.
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Affiliation(s)
- J Suvetha Rani
- Department of Laser Studies, School of Physics, Madurai Kamaraj University, Madurai, India.
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