Document Detail

Antioxidant Capacity of Teas and Herbal Infusions - Polarographic Assessment.
MedLine Citation:
PMID:  22950743     Owner:  NLM     Status:  Publisher    
Hydrogen peroxide scavenging (HPS) activity of unfermented (green, yellow and white), partially fermented (oolong) and completely fermented (black) tea (Camellia sinensis), maté (llex paraguariensis), various herbal infusions, as well as individual compounds (flavan-3-ols, flavonols, cinnamic and benzoic acids, and methylxanthines) was assessed by recently developed direct current (DC) polarographic assay. Correlations of tea and herbal infusion HPS activity with total phenolic content determined using Folin-Ciocalteu assay (FC-GAE) (0.81 and 0.93), FRAP (ferric reducing/antioxidant power) (0.97 and 0.92), DPPH (1,1-diphenyl-2-picrylhydrazyl) (0.77 and 0.80) and ABTS (2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) scavenging (0.86 and 0.86) were statistically significant. Correlations between RACI, relative antioxidant capacity index calculated by assigning all applied assay equal weight, and HPS (0.98), FRAP (0.97), ABTS (0.89) and DPPH (0.89) confirmed DC polarographic assay reliability when applied individually. Correlation analysis, ANOVA, Levene and Tukey's HSD tests unequivocally confirmed this rapid, easy-to-handle and low cost assay validity, clearly demonstrating its advantages over spectrophotometric assays applied.
Stanislava Gorjanovic; Drazenka Komes; Ferenc T Pastor; Ana Belščak-Cvitanović; Lato Pezo; Ivana Hečimović; Desanka Sužnjević
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-5
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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