Which contains protein whereby a biuret test will show a positive result?

 

I know saliva contain enzymes. Enzymes are protein in nature but aren't there in minute quantities to be accounted for?

 

Isn't urea made from protein?

No, urea is small, simple molecule. It consists of a carbon with a double-bonded oxygen and two amino groups. Urine usually only contains salt, water, urea, and a hodge-podge of less-common ingredients the body doesn't want to keep, but very few (if any) protien in a healthy, normal human.

 

Rats, interestingly, apparently *do* normally have protien in their urine. But the urea is always the same molecule I described above.

Saliva contains the enzyme amylase, which is used in the preliminary stage of breaking down food. Urea is just a form of a nitrogen compound used during excretion of bodily fluids, if anything I would imagine Urea to be a by-product of an enzymatic reaction

So if i were to test saliva for proteins. Would i get a positive biuret test?