1993/01/01 by Daniel K. Bempong, Peter J. Houghton, Kathryn J. Steadman · 2 citations
Agricultural and Biological Sciences · Medicine · #Phytochemistry Medicinal Plant Applications #Natural Antidiabetic Agents Studies #Ginkgo biloba and Cashew Applications
paper · doi:10.3109/13880209309082937
openalex publication_date 1993/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The Identity Of Caffeine As The Major Xanthine Present In Guarana Has Been Confirmed By Spectroscopic Methods. Theobromine and Theophylline Were Present In Small Amounts But The Presence Of A Tetramethylxanthine Could Not Be Detected. Evidence Was Obtained For The Presence Of A Complex Of Caffeine and A Tannin. Hplc Was Used To Quantify The Caffeine Present In Various Samples Of Guarana and Its Products. The Amount Of Caffeine Present Was Found To Be Between 2.0 and 4.5% W/W Which Is Of The Same Order As That Present In Tea and Coffee.