The Protein Content of Human Parotid Saliva

The analyses reported here concern the protein content of the human parotid secretion and the changes in concentration at different rates of secretion. That the rate of secretion affects the composition of the saliva has not been emphasized often, although t,he fact has long been known (1). In only a few reports of analyses of various salivary constituents is the rate considered an important factor. Determinations of salivary proteins with the currently accepted methods are rare. Organic solids in mixed and parotid saliva are reported by Hubbell (2) and others (3, 4), but no definite correlation between rate of secretion and the solid content was noted.