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Abstract:

A biotin-lipopolysaccharide (biotin-LPS) conjugate was synthesized from LPS smooth from Salmonella minnesota, yielding a conjugate with a biotin/LPS ratio equal to 1:1 and endotoxic activity of 0.08 EU ng-1. The conjugate was used in an amperometric competitive assay to determine endotoxins with endotoxin-neutralizing protein (ENP) as the recognition element. The assay is performed on a modified electrode, involving the covalent binding of carboxymethyl dextran (CMDex) to a cystamine-modified gold electrode and then the covalent binding of the recognition protein, ENP, to CMDex. The assay is carried out by incubating the modified electrode in an LPS sample to which biotin-LPS was added. Both species compete for the recognition sites on the modified surface. After the incubation stage and a careful rinsing, the electrode is immersed in a solution containing neutravidin-horseradish peroxidase conjugate (N-HRP), which binds to the sites containing biotin-LPS on the electrode. The system is rinsed and a current signal is generated by the addition of hydrogen peroxide and a redox mediator. The assay is able to detect LPS from Salmonella minnesota at concentrations as low as 0.1 ng ml-1, equivalent to 0.07 EU ml-1. © 2006 Elsevier Inc. All rights reserved.

Registro:

Documento: Artículo
Título:Endotoxin detection in a competitive electrochemical assay: Synthesis of a suitable endotoxin conjugate
Autor:Priano, G.; Pallarola, D.; Battaglini, F.
Filiación:INQUIMAE-Departamento de Química Inorgánica, Analítica y Química Física Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Palabras clave:Biotin-conjugated lipopolysaccharide; Competitive assay; Lipopolysaccharide; biotin; carboxymethyldextran; cystamine; endotoxin; endotoxin neutralizing protein; gold; horseradish peroxidase; hydrogen peroxide; lipopolysaccharide; neutravidin; unclassified drug; amperometry; article; binding competition; chemical modification; concentration (parameters); conjugation; covalent bond; electrochemical analysis; electrode; molecular recognition; nonhuman; oxidation reduction reaction; priority journal; Salmonella minnesota; toxin analysis; Biotin; Electrochemistry; Electrodes; Endotoxins; Lipopolysaccharides; Models, Biological; Models, Chemical; Molecular Structure; Oxidation-Reduction; Armoracia rusticana; Salmonella enterica subsp. enterica serovar Minnesota
Año:2007
Volumen:362
Número:1
Página de inicio:108
Página de fin:116
DOI: http://dx.doi.org/10.1016/j.ab.2006.12.034
Título revista:Analytical Biochemistry
Título revista abreviado:Anal. Biochem.
ISSN:00032697
CODEN:ANBCA
CAS:biotin, 58-85-5; carboxymethyldextran, 9044-05-7; cystamine, 51-85-4, 56-17-7; gold, 7440-57-5; hydrogen peroxide, 7722-84-1; Biotin, 58-85-5; Endotoxins; Lipopolysaccharides
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00032697_v362_n1_p108_Priano

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Citas:

---------- APA ----------
Priano, G., Pallarola, D. & Battaglini, F. (2007) . Endotoxin detection in a competitive electrochemical assay: Synthesis of a suitable endotoxin conjugate. Analytical Biochemistry, 362(1), 108-116.
http://dx.doi.org/10.1016/j.ab.2006.12.034
---------- CHICAGO ----------
Priano, G., Pallarola, D., Battaglini, F. "Endotoxin detection in a competitive electrochemical assay: Synthesis of a suitable endotoxin conjugate" . Analytical Biochemistry 362, no. 1 (2007) : 108-116.
http://dx.doi.org/10.1016/j.ab.2006.12.034
---------- MLA ----------
Priano, G., Pallarola, D., Battaglini, F. "Endotoxin detection in a competitive electrochemical assay: Synthesis of a suitable endotoxin conjugate" . Analytical Biochemistry, vol. 362, no. 1, 2007, pp. 108-116.
http://dx.doi.org/10.1016/j.ab.2006.12.034
---------- VANCOUVER ----------
Priano, G., Pallarola, D., Battaglini, F. Endotoxin detection in a competitive electrochemical assay: Synthesis of a suitable endotoxin conjugate. Anal. Biochem. 2007;362(1):108-116.
http://dx.doi.org/10.1016/j.ab.2006.12.034