The bitter principle in grapefruit is naringin, not quinine. They are not chemically related.
Quinine
Colchicine
Colchicine is a drug used in the treatment of acute gouty arthritis. Colchicine is effective in suppressing the inflammation in acute gouty arthritis.
From wikipedia: "Because of its relatively constant and well-known fluorescence quantum yield, quinine is also used in photochemistry as a common fluorescence standard" See: http://en.wikipedia.org/wiki/Quinine and http://en.wikipedia.org/wiki/File:Tonic_water_uv.jpg
colchicine is an metaphase arresting substance.
can quinine go bad
Quinine is a noun.
no
Quinine is measured in milligrams.
Shinshil Chang has written: 'Some effects of colchicine in female mice' -- subject(s): Mice, Colchicine
Glowing jello glows because of the quinine that absorbs light from the black light