Electrochemical Determination of Caffeine Content in Ethiopian Coffee Samples Using Lignin Modified Glassy Carbon Electrode
Joint Authors
Source
Journal of Analytical Methods in Chemistry
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-04-23
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
Lignin film was deposited at the surface of glassy carbon electrode potentiostatically.
In contrast to the unmodified glassy carbon electrode, an oxidative peak with an improved current and overpotential for caffeine at modified electrode showed catalytic activity of the modifier towards oxidation of caffeine.
Linear dependence of peak current on caffeine concentration in the range 6×10-6 to 100×10-6 mol L−1 with determination coefficient and method detection limit (LoD = 3 s/slope) of 0.99925 and 8.37×10-7 mol L−1, respectively, supplemented by recovery results of 93.79–102.17% validated the developed method.
An attempt was made to determine the caffeine content of aqueous coffee extracts of Ethiopian coffees grown in four coffee cultivating localities (Wonbera, Wolega, Finoteselam, and Zegie) and hence to evaluate the correlation between users preference and caffeine content.
In agreement with reported works, caffeine contents (w/w%) of 0.164 in Wonbera coffee; 0.134 in Wolega coffee; 0.097 in Finoteselam coffee; and 0.089 in Zegie coffee were detected confirming the applicability of the developed method for determination of caffeine in a complex matrix environment.
The result indicated that users’ highest preference for Wonbera and least preference for Zegie cultivated coffees are in agreement with the caffeine content.
American Psychological Association (APA)
Amare, Meareg& Aklog, Senait. 2017. Electrochemical Determination of Caffeine Content in Ethiopian Coffee Samples Using Lignin Modified Glassy Carbon Electrode. Journal of Analytical Methods in Chemistry،Vol. 2017, no. 2017, pp.1-8.
https://search.emarefa.net/detail/BIM-1170195
Modern Language Association (MLA)
Amare, Meareg& Aklog, Senait. Electrochemical Determination of Caffeine Content in Ethiopian Coffee Samples Using Lignin Modified Glassy Carbon Electrode. Journal of Analytical Methods in Chemistry No. 2017 (2017), pp.1-8.
https://search.emarefa.net/detail/BIM-1170195
American Medical Association (AMA)
Amare, Meareg& Aklog, Senait. Electrochemical Determination of Caffeine Content in Ethiopian Coffee Samples Using Lignin Modified Glassy Carbon Electrode. Journal of Analytical Methods in Chemistry. 2017. Vol. 2017, no. 2017, pp.1-8.
https://search.emarefa.net/detail/BIM-1170195
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1170195