Why is gallic acid for TPC and quercetin for TFC the standards used in these assays? All studies I have come across use Gallic acid equivalents and quercetin equivalents to express TPC and TFC values. Aside from a fact that gallic acid is a phenolic acid and quercetin is a flavonoid, are there any other reasons more to it?
see
https://www.researchgate.net/post/Choice_of_standards_for_TPC_and_TFC
Gallic acid is an ideal phenolic compound with an aromatic ring, it contains four hydroxyls. Quercetin also has the same feature; it has a flavonoid base structure with five hydroxyls. Those features make them have high-activity compounds.
Harto Widodo Gallic (not galic) acid has three hydroxy groups in aromatic ring. What is a phenolic compound?
As antioxidants, both gallic acid and quercetin are able to scavenge up to six radicals each.
Ok.. Mr. Yurii V Geletii thank you very much for your nice correction.
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