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Antioxidant: Difference between revisions
→Antioxidant Supplements
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*'''Alpha-Lipoic Acid''': A compound that works with mitochondria and the body's natural antioxidant defenses. | *'''Alpha-Lipoic Acid''': A compound that works with mitochondria and the body's natural antioxidant defenses. | ||
*'''Green Tea Extract''': Rich in catechins, green tea extract is renowned for its antioxidant properties. | *'''Green Tea Extract''': Rich in catechins, green tea extract is renowned for its antioxidant properties. | ||
== '''Oxygen Radical Absorbance Capacity''' ('''ORAC''') == | |||
Measurement of polyphenol and carotenoid content in food is not a straightforward process, as antioxidants collectively are a diverse group of compounds with different reactivities to various reactive oxygen species. In food science analyses in vitro, the '''oxygen radical absorbance capacity (ORAC)''' was once an industry standard for estimating antioxidant strength of whole foods, juices and food additives, mainly from the presence of polyphenols.<ref>{{cite journal|vauthors=Cao G, Alessio HM, Cutler RG|title=Oxygen-radical absorbance capacity assay for antioxidants|journal=Free Radical Biology & Medicine|volume=14|issue=3|pages=303–11|date=March 1993|pmid=8458588|doi=10.1016/0891-5849(93)90027-R|url=https://zenodo.org/record/1258621}}</ref><ref>{{cite journal|vauthors=Ou B, Hampsch-Woodill M, Prior RL|title=Development and validation of an improved oxygen radical absorbance capacity assay using fluorescein as the fluorescent probe|journal=Journal of Agricultural and Food Chemistry|volume=49|issue=10|pages=4619–26|date=October 2001|pmid=11599998|doi=10.1021/jf010586o}}</ref> Earlier measurements and ratings by the United States Department of Agriculture were withdrawn in 2012 as biologically irrelevant to human health, referring to an absence of physiological evidence for polyphenols having antioxidant properties ''in vivo''.<ref name="USDAx">{{cite web|url=http://www.ars.usda.gov/services/docs.htm?docid=15866|title=Withdrawn: Oxygen Radical Absorbance Capacity (ORAC) of Selected Foods, Release 2 (2010)|date=16 May 2012|publisher=United States Department of Agriculture, Agricultural Research Service|access-date=13 June 2012}}</ref> Consequently, the ORAC method, derived only from ''in vitro'' experiments, is no longer considered relevant to human diets or biology, as of 2010.<ref name="USDAx" /> | |||
== See Also == | == See Also == | ||