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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: The fractional amount of ABTS consumed at each interval was 1 − Ax/A0. These values for cinnamon and red pepper and two other test specimens are plotted as a linear function of time in Figure 2 and on a semilog scale in Figure 3.


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: The fractional amount of ABTS consumed at each interval was 1 − Ax/A0. These values for cinnamon and red pepper and two other test specimens are plotted as a linear function of time in Figure 2 and on a semilog scale in Figure 3.

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