Pancreatin contains the pancreatic enzymes trypsin, amylase and lipase. Saliva contains the enzyme amylase, which hydrolyses starch into maltose and dextrin. Amylase and lipase are 2 enzymes produced by the pancreas. Smaller amounts of lipase and amylase are secreted. Serum amylase and lipase may be moderately elevated in cases of chronic pancreatitis. Also of importance is the presence in saliva of the digestive enzymes amylase and lipase. It is composed of amylase, lipase and protease. The AMY2B gene produces an enzyme that helps to digest amylase (starch). Egg yolk also contains enzymes like amylase, which can break down added starch. Gelatinization improves the availability of starch for amylase hydrolysis. The glucose produced from starch by salivary amylase, is also digested by the bacteria. Saliva is composed primarily of water, ions, salivary amylase, lysozymes, and trace amounts of urea. A renewed interest in salivary alpha amylase as a marker for stress has surfaced. Blood serum amylase may be measured for purposes of medical diagnosis. Medical laboratories will usually measure either pancreatic amylase or total amylase.