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Title:Antioxidant and antimicrobial activity of guarana seed extracts
Authors:Majhenič, Lucija (Author)
Škerget, Mojca (Author)
Knez, Željko (Author)
Files:URL http://dx.doi.org/10.1016/j.foodchem.2007.01.074
 
Language:English
Work type:Unknown ()
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:The antioxidant and antibacterial activities of guarana (Paullinia cupana) seed extracts were determined. The seeds were extracted with water, methanol, 35% acetone and 60% ethanol at room (TR) and at boiling (TB) temperature of solvent.Extracts were analyzed for the contents of caffeine and catechins, epicatechin (EC), catechin (C) and epicatechin gallate (ECG), by high performance liquid chromatography (HPLC). The contents of total phenols (according to the Folin-Ciocalteu procedure) and proanthocyanidins were analysed by UV spectrophotometry. The guarana seed water extract obtained at room temperature contained higher amounts of caffeine and catechins than did alcoholic guarana seed extracts. The antioxidant and radical-scavenging activities of guarana seed extracts were evaluated using the ß-carotene-linoleic acid emulsion system and the stable free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH ). All tested guarana seed extracts displayed strong antioxidant and radical-scavenging properties. The guarana seed extracts were tested against three food-borne fungi: Aspergillus niger, Trichoderma viride and Penicillium cyclopium, and three health-damaging bacteria: Escherichia coli, Pseudomonas fluorescens and Bacillus cereus by theagar well diffusion and broth dilution assay. The alcoholic guarana seed extracts displayed stronger antimicrobial activity against all tested microorganisms than did water extracts. Results presented here may suggest that seed extracts of guarana possess strong antimicrobial and antioxidant properties, and they can therefore be used as a natural additive in food, cosmetic and pharmaceutical industries.
Keywords:chemical processing, guarana extract, Paullinia cupana, seed extracts, antimicrobial properties, antioxidative properties
Year of publishing:2007
UDC:66.061
ISSN on article:0308-8146
COBISS_ID:11421206 Link is opened in a new window
NUK URN:URN:SI:UM:DK:2KTFL5I9
Views:1267
Downloads:82
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Categories:Misc.
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Record is a part of a journal

Title:Food chemistry
Shortened title:Food chem.
Publisher:Applied Science Publishers
ISSN:0308-8146
COBISS.SI-ID:6385415 New window

Secondary language

Language:English
Keywords:kemijska procesna tehnika, guarana ekstrakt, Paullinia cupana, izvlečki semen, antimikrobne lastnosti, antioksidativne lastnosti


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