Fluorescence determination of cochineal in strawberry jam in the presence of carmoisine as a quencher by means of four-way PARAFAC decomposition
| Autor: | S. Sanllorente, Laura Rubio Rubio, M.C. Ortiz, Luis A. Sarabia |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Cochineal
Carmine Fragaria 01 natural sciences Analytical Chemistry 0404 agricultural biotechnology Quenching effect media_common.cataloged_instance European union Chromatography High Pressure Liquid media_common Quenching (fluorescence) Chromatography biology Chemistry 010401 analytical chemistry Química analítica 04 agricultural and veterinary sciences General Medicine Excitation-emission fluorescence Four-way PARAFAC decomposition biology.organism_classification 040401 food science Fluorescence 0104 chemical sciences Spectrometry Fluorescence Chemistry Analytic Algorithms Carmoisine Strawberry jam Food Science |
| Zdroj: | Repositorio Institucional de la Universidad de Burgos (RIUBU) instname |
| ISSN: | 0308-8146 |
| DOI: | 10.1016/j.foodchem.2019.03.113 |
| Popis: | The determination of cochineal (E-120) in strawberry jam was carried out in the presence of carmoisine (E-122) using the four-way PARAFAC decomposition and excitation-emission fluorescence matrices. In the measured conditions, there was no fluorescence signal for carmoisine due to a strong quenching effect and this colorant also led to a decrease of the fluorescence signal of cochineal. The European Union has fixed a maximum residue level, MRL, for cochineal in jam (100 mg kg−1). Therefore, the addition of other food colorant (carmoisine) in the jam could lead to false compliant decisions. The four-way PARAFAC decomposition avoided false compliant decisions caused by the quenching effect. Cochineal was unequivocally identified. Detection capability (CCβ) was 0.72 mg L−1 for probabilities of false positive and false negative fixed at 0.05. Cochineal was detected in the jam (104.63 mg kg−1) above the MRL. This amount was compared with the one obtained using a HPLC/DAD method. Spanish MINECO (AEI/FEDER, UE) through project CTQ2017‐88894-R and by Junta de Castilla y León through project BU012P17 (all co‐financed with European FEDER funds). |
| Databáze: | OpenAIRE |
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