I'm working on collagen and want to find its concentration by UV
I Found this article , hope it helps http://scholarsresearchlibrary.com/APR-vol2-iss4/APR-2011-2-4-50-59.pdf
There is a program on the internet, where you put the sequence of the protein in, and it gives you the extinction coefficient. I forgot the name but you can google it. It might be under EXPASY. Maybe others can comment.
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I doubt that the coloured solution will interfere at 240nm. Regardless, I have blanked the medium.
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