basic chemistry alkaline test for flavonoids!!! with reference please [closed]








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What is flavanoid physical and chemical properties, and how alkaline reagent test for flavonoids gives yellow coulour?




From this [reference](https://books.google.com/books?id=TXsiFVVuCqMC&pg=PA203&lpg=PA203&dq=flavonoid%20base&source=bl&ots=04L0QuwFfy&sig=xLpJ4o9VIclIybWO9IDeigYPCK8&hl=en&sa=X&ei=SelpVay0JI7LogSfyIKgBQ&ved=0CDEQ6AEwAg#v=onepage&q=flavonoid%20base&f=false): 



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> Treatment of a flavonoid with a strong base will result in ionization of its hydroxyl groups with resulting large bathochromic shifts of both absorption maxima.
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