A extração de cafeína em bebidas estimulantes: uma nova abordagem para um experimento clássico em química orgânica

Abstract

Recebido em 12/11/01; aceito em 23/9/02 CAFFEINE EXTRACTION FROM STIMULATING BEVERAGES: A NEW APPROACH FOR A CLASSIC ORGANIC CHEMISTRY EXPERIMENT. Caffeine extraction procedures from water soluble and water insoluble materials for preparing stimulating beverages are described. Water soluble materials used were instant tea and coffee and water insoluble materials were, among others, guaraná powder and maté leaves. The extraction of caffeine from water soluble materials, especially instant tea, is more suitable for an organic chemistry teaching laboratory than the classic experiment using tea leaves, due to the economy of time and a larger amount of extracted caffeine. The procedure is time-saving and requires only a four-hour period. The experiments illustrate the extraction process as used in undergraduate organic chemistry laboratories.