Is there any objective test which is able to discriminate the presence of chlorophyll from its precursors (chlorophyllides)?

Let's say you have a liquid alcoholic solution from young just-germinated embryos from seeds. The solution has a greenish colour whose origin could be both chlorophyll or any chlorophyllide, i.e. chlorophyll precursor.

How can you be sure about chlorophyll? I have tried photo-emission tests but the spectral difference is so small that indeed it is hard to discriminate between the two. Any suggestion?

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