Rapid and Sensitive Determination of Methylxanthines in Commercial Brands of Tea Using Ultra-High-Performance Liquid Chromatography-Mass Spectrometry
Joint Authors
Alothman, Zeid A.
Al-Rifai, Asma’a
Aqel, Ahmad
Wabaidur, Saikh M.
Almulla, Ahmed
Badjah-Hadj-Ahmed, Ahmed-Yacine
Source
International Journal of Analytical Chemistry
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-11-03
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
Recently, chromatographic techniques have the potential to be greener in order to reduce the environmental impact.
In this work, a new simple, sensitive, efficient, and green analytical method based on UHPLC-MS has been developed for a quick determination of methylxanthines including caffeine, theobromine, and theophylline in tea.
Under the optimum conditions, a baseline separation has been achieved within 30 seconds, using isocratic elution consisting of 90% water and only 10% acetonitrile at 0.5 mL/min flow rate (3 mL acetonitrile per hour).
The mass spectrometer was operated with the SIR mode in ESI+.
The developed method was found to be linear in the range of 0.03–5 μg/mL, with correlation coefficients greater than 0.9995 for the three compounds.
The respective values of LOD were found to be 0.025, 0.015, and 0.01 μg/mL for caffeine, theobromine, and theophylline, respectively.
The proposed assay was applied to 30 commercial tea samples of different brands.
Both caffeine and theobromine were found in all tea samples with maximum concentration in sample no.
15, corresponding to 32.6 and 2.72 mg/g of caffeine and theobromine, respectively.
On the contrary, theophylline was not detected at all in most samples.
When compared with all previous studies that dealt with the same compounds in different matrices, the developed method was found to be the fastest, allowing high-throughput analyses with more than 100 samples/h.
The results prove that the method is suitable for routine analysis of methylxanthines and to distinguish the quality of tea samples of various brands.
American Psychological Association (APA)
Aqel, Ahmad& Almulla, Ahmed& Al-Rifai, Asma’a& Wabaidur, Saikh M.& Alothman, Zeid A.& Badjah-Hadj-Ahmed, Ahmed-Yacine. 2019. Rapid and Sensitive Determination of Methylxanthines in Commercial Brands of Tea Using Ultra-High-Performance Liquid Chromatography-Mass Spectrometry. International Journal of Analytical Chemistry،Vol. 2019, no. 2019, pp.1-9.
https://search.emarefa.net/detail/BIM-1155861
Modern Language Association (MLA)
Aqel, Ahmad…[et al.]. Rapid and Sensitive Determination of Methylxanthines in Commercial Brands of Tea Using Ultra-High-Performance Liquid Chromatography-Mass Spectrometry. International Journal of Analytical Chemistry No. 2019 (2019), pp.1-9.
https://search.emarefa.net/detail/BIM-1155861
American Medical Association (AMA)
Aqel, Ahmad& Almulla, Ahmed& Al-Rifai, Asma’a& Wabaidur, Saikh M.& Alothman, Zeid A.& Badjah-Hadj-Ahmed, Ahmed-Yacine. Rapid and Sensitive Determination of Methylxanthines in Commercial Brands of Tea Using Ultra-High-Performance Liquid Chromatography-Mass Spectrometry. International Journal of Analytical Chemistry. 2019. Vol. 2019, no. 2019, pp.1-9.
https://search.emarefa.net/detail/BIM-1155861
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1155861