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Fully-automated in-syringe dispersive liquid-liquid microextraction for the determination of caffeine in coffee beverages

Citation

Frizzarin, RM and Maya, F and Estela, JM and Cerda, V, Fully-automated in-syringe dispersive liquid-liquid microextraction for the determination of caffeine in coffee beverages, Food Chemistry, 212 pp. 759-767. ISSN 0308-8146 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Elsevier Ltd

DOI: doi:10.1016/j.foodchem.2016.06.032

Abstract

A novel fully-automated magnetic stirring-assisted lab-in-syringe analytical procedure has been developed for the fast and efficient dispersive liquid-liquid microextraction (DLLME) of caffeine in coffee beverages. The procedure is based on the microextraction of caffeine with a minute amount of dichloromethane, isolating caffeine from the sample matrix with no further sample pretreatment. Selection of the relevant extraction parameters such as the dispersive solvent, proportion of aqueous/organic phase, pH and flow rates have been carefully evaluated.

Caffeine quantification was linear from 2 to 75 mg L−1, with detection and quantification limits of 0.46 mg L−1 and 1.54 mg L−1, respectively. A coefficient of variation (n = 8; 5 mg L−1) of a 2.1% and a sampling rate of 16 h−1, were obtained. The procedure was satisfactorily applied to the determination of caffeine in brewed, instant and decaf coffee samples, being the results for the sample analysis validated using high-performance liquid chromatography.

Item Details

Item Type:Refereed Article
Keywords:flow analysis, liquid-liquid extraction, lab-in-syringe, dispersive liquid-liquid microextraction, caffeine determination, spectrophotometry, UV detection, coffee beverages
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Flow Analysis
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
UTAS Author:Maya, F (Mr Fernando Maya Alejandro)
ID Code:127840
Year Published:2016
Web of Science® Times Cited:22
Deposited By:Chemistry
Deposited On:2018-08-19
Last Modified:2018-09-20
Downloads:0

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