Hydroxyquinoline CANNOT be made from grapefruit and lemon because it can only be synthesized and is not a natural compound.
With this in mind, we can see that hydroxyquinoline is usually used to salve the effects of a freshly cut cow udder as it is applied to soothe skin.
Furthermore, it can be chemically gotten when glycerol is mixed with 2-aminophenol alongside with sulphuric acid and this cannot be gotten from grapefruit and lemon.
