Abstract
Caffeine is a widely consumed pharmacologically active substance around the world, Caffeine is a purine alkaloid derived from methylxanthine that is readily permeable through the blood-brain barrier and stimulates the adenosine receptors in the brain leading to its central nervous system stimulant activity. Most people regulate their caffeine consumption in accordance with the objective and subjective effects produced from the methylxanthine, However, individual response to caffeine varies greatly from person to person due to the variation in metabolism, age, sex, hormones, clearance, weight, genes, medicine intake and smoking behavior, therefore the amount of caffeine required to achieve the desired effect also varies greatlyand Since that the coffee beans are the world's primary sources of dietary caffeine this study was designed to determine the percent of the caffeine in different commercial coffee brands, the isolated caffeine was identified by different qualitative methods like TLC, and FTIR.
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