Extraction and Determination of Caffeine Concentrations in Coffee, Tea and Chocolate Milk Available in Saudi Markets
Sarra Talab *
Department of Chemistry, College of Science, AI Imam Mohammad Ibn Saud Islamic University (IMSIU), P.O.Box 5701, Riyadh 11432, Kingdom of Saudi Arabia and Department of Chemistry, College of Applied and Industrial Science, University of Bahri, P.O.Box 11111, Khartoum 1660, Sudan.
*Author to whom correspondence should be addressed.
Abstract
In this work a study was performed using UV/Vis spectrophotometer to determine the concentrations of caffeine in coffee, tea and chocolate milk available in local market in Riyadh, Saudi Arabia. Quantitative analysis was carried using dichloromethane as extracting solvent. Results showed that the minimum caffeine level was observed in the chocolate milk (16.38 ppm) and the highest caffeine content observes in coffee (32 ppm).
Keywords: Caffeine, dichloromethane, absorbance, UV/vis spectrophotometer