Why I get a top layer following addition of the salt that looks like protein or fat (white and fluffy) but does not precipitate with the salt?

07 February 2017 1 7K Report

I have noticed in some samples a top layer following addition of the salt that looks like protein or fat (white and fluffy) but does not precipitate with the salt. I always pipette from beneath this layer to remove the aqeous phase. If anyone knows more about this or has a way to make it precipitate with the cell debris, please make a note here.

Hassan Darwish

Thank you so much Dr. Ali for your valuable answer.

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