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The rate of decolorization of a radical ion reagent was used to determine the phenolic content of various food extracts.

Bradley A - Int J Anal Chem (2013)

Bottom Line: An aliquot rapidly decolorizes a measured portion of ABTS, a stable deep blue radical ion.The semilog plot of light absorption versus time is typically a straight line, and an immediately evident slope provides rapid classification in terms of gallic acid equivalents.Experimental data are presented to show general agreement with the literature.

View Article: PubMed Central - PubMed

Affiliation: Solar Physics Corporation, P.O. Box 548, Locust Valley, NY 11560, USA.

ABSTRACT
Polyphenols are among the most valuable and widely studied food components. In the laboratory, they are readily extractable with aqueous alcohol. An aliquot rapidly decolorizes a measured portion of ABTS, a stable deep blue radical ion. The semilog plot of light absorption versus time is typically a straight line, and an immediately evident slope provides rapid classification in terms of gallic acid equivalents. Experimental data are presented to show general agreement with the literature. The disproportionate concentration of antioxidant in the skins and peels of fruits, vegetables, and nuts is given special attention.

No MeSH data available.


Related in: MedlinePlus

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Mentions: Since a reliable 30 second point could also be obtained, extra cycles were added to the plot to extrapolate back toward zero. Absorption data for cloves, walnut, and blackberry, plus gallic acid, are presented in Figure 4. Similar data for tea, strawberry, nutmeg, and grape juice are assembled in Figure 5. It should be pointed out that the charts offer no clues to AOA ratings. Each assay had its own individual sample weight and solvent volume (Table 1).


The rate of decolorization of a radical ion reagent was used to determine the phenolic content of various food extracts.

Bradley A - Int J Anal Chem (2013)

© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3824337&req=5

Mentions: Since a reliable 30 second point could also be obtained, extra cycles were added to the plot to extrapolate back toward zero. Absorption data for cloves, walnut, and blackberry, plus gallic acid, are presented in Figure 4. Similar data for tea, strawberry, nutmeg, and grape juice are assembled in Figure 5. It should be pointed out that the charts offer no clues to AOA ratings. Each assay had its own individual sample weight and solvent volume (Table 1).

Bottom Line: An aliquot rapidly decolorizes a measured portion of ABTS, a stable deep blue radical ion.The semilog plot of light absorption versus time is typically a straight line, and an immediately evident slope provides rapid classification in terms of gallic acid equivalents.Experimental data are presented to show general agreement with the literature.

View Article: PubMed Central - PubMed

Affiliation: Solar Physics Corporation, P.O. Box 548, Locust Valley, NY 11560, USA.

ABSTRACT
Polyphenols are among the most valuable and widely studied food components. In the laboratory, they are readily extractable with aqueous alcohol. An aliquot rapidly decolorizes a measured portion of ABTS, a stable deep blue radical ion. The semilog plot of light absorption versus time is typically a straight line, and an immediately evident slope provides rapid classification in terms of gallic acid equivalents. Experimental data are presented to show general agreement with the literature. The disproportionate concentration of antioxidant in the skins and peels of fruits, vegetables, and nuts is given special attention.

No MeSH data available.


Related in: MedlinePlus