Chemical analysis of the semipurified extract of and evaluation of inhibitory effects against .

Kunth, commonly known as guarana, is a native Brazilian plant species from the Amazon area that presents various biological effects, including antimicrobial action. The aim of this study was to chemically analyse the semipurified aqueous extract (AqF) of the plant and to evaluate the activity of crude (CE), ethyl-acetate (EAF), and AqF extracts against . The chemical profile of AqF was determined based on solid analysis C-NMR, direct infusion mass spectrometry (ESI-MS), and MALDI-TOF.

Larvicidal Activity against and Chemical Characterization of the Inflorescences of .

The crude acetone extract (CAE) of defatted inflorescences of was partitioned into five semipurified fractions: -hexane (HF), dichloromethane (DF), ethyl acetate (EAF), -butanol (BF), and aqueous (AQF). BF was fractionated by reversed-phase polyamide column chromatography, obtaining 34 subfractions, which were subjected to HSCCC, where patuletin and patulitrin were isolated. CAE and the fractions BF, EAF, DF, and AQF were analyzed by LC-DAD-MS, and patuletin and patulitrin were determined as the major substances in EAF and BF, respectively.

Antioxidant capacity and in vitro prevention of dental plaque formation by extracts and condensed tannins of Paullinia cupana.

Chemical evaluation of the semi-purified fraction from the seeds of guaraná, Paullinia cupana H.B.K.