Artificial saliva. Liquid simulating conditions in the oral
cavity was prepared according to the Arvidson model. Artificial
saliva, pH 6.7, was prepared by mixing quadruple-distilled water
with 100 mL of 25 mM KH2PO4, 100 mL 24 mM Na2HPO4, 100 mL
150 mM KHCO3, 100 mL 100 mM NaCl, 100 mL 1.5 mM MgCl2, 6mL
25 mM citric acid and 100 mL of 15 mM CaCl2. In this model,
digestive enzymes were not considered (a-salivary amylase, salivary
lipase) to be present in saliva