Direct minimally invasive enzymatic determination of tyramine in cheese using digital imaging

Oliver S. ; Marcos S. de (Universidad de Zaragoza) ; Sanz-Vicente I. (Universidad de Zaragoza) ; Cebolla V. ; Galbán J. (Universidad de Zaragoza)

Resumen: An enzymatic method for the direct (without pretreatment) minimally invasive tyramine determination in cheese is proposed. Colorimetric test strips containing tyramine oxidase (TAO), peroxidase and 3, 3', 5, 5'-tetramethylbenzidine (Q-TAO), allow tyramine determination through the RGB chromatic coordinates of the observed blue colour (LOD = 2.6·10-6 M, LOQ = 8.7·10-6 M, RSD% (n = 5; 1.8·10-4 M) = 3.2%). The strips are inserted in the sample for 2 min and then the RGB coordinates are measured using a smartphone. Previously, these Q-TAO strips have been also optimized for tyramine determination in cheese extract. To do that, a spectrophotometric method in solution for tyramine determination in cheese extracts has been developed, which included an in-depth study of the indicating reaction; this study has allowed to gain new information about the spectroscopic properties of different TMB species and, which it is more important, to detect cross-reactions between TAO and TMB species. A mathematical model has also been developed which relate the RGB signals obtained with the tyramine concentrations, the instrumental characteristics of the smartphone and the spectroscopic properties of the absorbing product of the enzymatic reaction. © 2021 Elsevier B.V.

Idioma: Inglés

DOI: 10.1016/j.aca.2021.338489

Año: 2021

Publicado en: Analytica Chimica Acta 1164 (2021), 338489 [8 pp]
ISSN: 0003-2670

Factor impacto JCR: 6.911 (2021)

Categ. JCR: CHEMISTRY, ANALYTICAL rank: 10 / 87 = 0.115 (2021) - Q1 - T1

Factor impacto CITESCORE: 10.5 - Environmental Science (Q1) - Biochemistry, Genetics and Molecular Biology (Q1)

Factor impacto SCIMAGO: 1.105 - Analytical Chemistry (Q1) - Spectroscopy (Q1) - Environmental Chemistry (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/E25-17R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CTQ2016-76846-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/PID2019-105408GB-I00

Tipo y forma: Article (Published version)

Área (Departamento): Área Química Analítica (Dpto. Química Analítica)