I am doing a lab and there is an unknown substance. After conducting four experiments I found out that the substance only contains protein. (reducing sugar, lipids, starch, and protein) So I wonder what substance only contains protein? What can be possible identity for this unknown substance?
And this substance is a white solid, soluble in water, but not very soluble, I needed to shake the bottle for it to dissolve completely. Although I didn’t get to touch the substance, but it wasn’t powdery. I am sure it’s not sugar nor salt.
PLEASE HELP ME THIS IS SO URGENT!!!!!!!!!!!!