Why does pepsin act only on proteid matter, and ptyalin only on starch and dextrins?
Amylopsin is much more powerful and rapid than the ptyalin of the saliva, especially on uncooked starch.
These unorganized ferments are such as rennin, pepsin, trypsin, ptyalin.
ptyalin, -e, tī′a-lin, n. the nitrogenous essential principle of saliva.
One part of ptyalin, according to Mialhe, was capable of transforming 800 parts of insoluble starch into sugar.
Amylopsin, the starch-digesting enzym, appears to be very similar to ptyalin in its power to digest carbohydrates.
It has been computed that the average daily secretion of ptyalin by an adult amounts to 116 grains.
The action of ptyalin, however, continues in the fundus of the stomach until stopped by the acid in the gastric juice.
The diastase of the malt has the same action on starch as the ptyalin in the saliva.
ptyalin pty·a·lin (tī'ə-lĭn)
An amylase present in saliva that catalyzes the hydrolysis of starch into maltose and dextrin.