Hi all... is there any way to know the content of beta carotene in a solution?

Form of beta carotene is C40H56...

Whether there are elements that can react with beta-carotene in solution so that can change the color of the solution?

Is anyone here know about that? Help me please... thanks

There are many reagents that will react with the double bonds in beta-carotene. Many of them are colored (I2, Br2, KMnO4) and will be declolorized upon reaction. They also will decolorize the beta-carotene itself but I don't think this could be used quantitatively since the color of beta-carotene comes from its long conjugated system of double bonds. Fewer double bonds or an interrupted conjugated system would also change the color. I think you would be better served with UV/VIS spectroscopy. Hydrogenation to completion would be another possibility. You can also compare the color of known solutions with a solution of unknown concentration. Does this help?

Thanks a lot DrBob1 for the answer... which one is the cheapest between I2, Br2, KMnO4?