Contribution Of Guaraná Powder (paullinia Cupana) As A Source Of Caffeine In The Diet [contribuição Do Guaraná Em Pó (paullinia Cupana) Como Fonte De Cafeína Na Dieta]

Objective: The present study was conducted in order to determine the caffeine levels in different brands of commercially available guaraná powder. Methods: The analytical methodology involved extraction with water, clean-up with saturated basic lead acetate solution and determination by high performance liquid chromatography with diode array detector (200-400nm). 39 samples were purchased in the cities of Campinas and Ribeirão Preto, SP, between December 2003 and January 2004 and analyzed. Results: The caffeine levels in the samples varied widely ranging from 9.52 to 36.71mg/g, probably due to differences in the origin of the raw material and to the types of processing that the guaraná seeds are submitted to. In comparison to coffee, traditional source of caffeine in the diet, it is possible to verify that the average caffeine content in guaraná powder is about four times higher than the quantities present in coffee. 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