Porovnání metod stanovení antioxidační aktivity v ovocných a zeleninových šťávách

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Antioxidant activity of 18 fruit and vegetable juices was determined using DPPH (2,2-diphenyl-1-picryl-hydrazyl), FRAP (ferric reducing antioxidant potential), PCL (photochemiluminiscence) methods. Correlations between the results of individual methods and the total phenolics and anthocyanin contents were evaluated. Water and methanol extracts were applied in the determinations. In both water and methanol extracts, a significant correlation between the results of all the three methods was found. However, the correlation between the results of PCL and total phenolics content is poor. No correlation between the results of ACW and ACL was found. Antioxidant activity in the tested juices decreased in the order: blueberry > red cabbage > raspberry > sour cherry > strawberry > beetroot. Celery, carrot and cucumber are poor sources of antioxidants. The orders found by various methods do not differ significantly; DPPH, FRAP and ACL methods are interchangeable for this purpose. For complete information on antioxidant activity, application of more methods following different effects is necessary. … full description

Bibliographic Details

Main Author

Marie Holasová, 1946-

Other Authors

Vlasta Fiedlerová

Document Type

Articles

Physical Description

7 il.

Published in

Chemické listy. -- ISSN 0009-2770. -- Roč. 105, č. 9 (2011), s. 766-772

Subjects

ANALYTICAL METHODS

CHEMICAL REACTIONS

ANTIOXIDANTS

POLYPHENOLS

ANTHOCYANINS

FRUIT JUICES

VEGETABLE JUICES

EXTRACTS

antioxidační aktivita

DPPH

FRAP

PCL

analytické metody

chemické reakce

antioxidanty

polyfenoly

antokyaniny

ovocné šťávy

zeleninové šťávy

extrakty

more… less…

Item Description

6 tabulek, 1 graf

Bibliography

Literatura na s. 771 (26 zázn.)