Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/200558
Type: Artigo de periódico
Title: Hplc-dad-esi/ms Identification And Quantification Of Phenolic Compounds In Ilex Paraguariensis Beverages And On-line Evaluation Of Individual Antioxidant Activity.
Author: Peres, Renato G
Tonin, Fernando G
Tavares, Marina F M
Rodriguez-Amaya, Delia B
Abstract: Chimarrão and tererê are maté (dried, toasted and milled Ilex paraguariensis leaves and stemlets) beverages widely consumed in South America. This paper describes the application of HPLC-DAD-ESI/MS method for the identification and quantification of caffeoylquinic acids (CQA), flavonol glycosides and purine alkaloids in these beverages. The beverage samples were prepared from commercial lots of maté from Southern Brazil. The caffeoylquinic acids, 4,5-diCQA, 3-CQA, 5-CQA, and 4-CQA were the major compounds, having 238-289, 153-242, 183-263, and 123-188 μg/mL, respectively, for chimarrão and 206-265, 122-218, 164-209, 103-169 μg/mL, respectively, for tererê. Caffeine also had high amounts while glycosides of quercetin and kaempferol were found at much lower levels. The individual antioxidant activity was also determined by an on-line system that measured their ABTS•+ radical scavenging activity, showing that the antioxidant capacity was not proportional to the concentrations of the phenolic compounds. 3-CQA, quercetina-3-O-ramnosylglucoside, and quercetina-3-O-glucoside were the major contributors to the antioxidant capacity, although the quercetin glycosides had concentrations less than 10 times that of 3-CQA.
Subject: Antioxidants
Benzothiazoles
Beverages
Brazil
Caffeine
Chlorogenic Acid
Chromatography, High Pressure Liquid
Flavonols
Ilex Paraguariensis
Kaempferols
Mass Spectrometry
Phenols
Plant Extracts
Plant Leaves
Quercetin
Quinic Acid
Sulfonic Acids
Rights: aberto
Identifier DOI: 10.3390/molecules18043859
Address: http://www.ncbi.nlm.nih.gov/pubmed/23538900
Date Issue: 2013
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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