Caffeine is one of the substances in coffee. Several factors affect the caffeine content in
coffee, such as harvesting, post-harvesting, roasting, drying, and storage. This study aimed …

A reversed-phase high performance liquid chromatography (RP-HPLC) method was
developed and validated for the quantitative analysis of caffeine content in 40 different types …

The seeds of guarana, a Brazilian plant from the Amazon forest, have been extensively used
both as dietary supplements and in energy drinks. Some authors have studied the chemical …

Guarana (Paullinia cupana) is an Amazonian native fruit, whose seeds are rich in caffeine
and phenolic compounds. Due to the economic importance of guarana, it is necessary to …

A produção magistral do xarope de guaco, obtido a partir do extrato fluido do guaco
(Mikania glomerata Spreng., Asteraceae) e comercializada na Farmácia Universitária da …

The current study was aimed to develop a low cost HPLC method for determination of
caffeine content in coffee samples in some coffee shops in Jeddah local market. Caffeine …

In the last two decades or so, guaraná a caffeine rich fruit, has emerged as a key ingredient
in various 'sports' and energy drinks as well as concoctions that allegedly boost one's libido …

Background This study was conducted to develop fast and cost effective methods for the
determination of caffeine in green coffee beans. In the present work direct determination of …

In this article are described and compared two spectrophotometric methods for the analysis
of catechol (o-hydroxyphenol) in Paullinea cupana var. sorbilis, popularly known as …

This study aims to determine the caffeine and detection of some other drugs (which has
commonly spread and caused suicides in the recent years in El-Bieda city-Libya) in …