Carbonic acid tablets promote submandibular-sublingual salivary secretion in humans

• Published in: Journal of Functional Foods
• Main Authors: Kenkichi Yamamoto, Shinji Yamamoto, Yuki Yanagisawa
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2020
• Subjects: Carbonic acid tablet; Carbon dioxide; Salivary secretion; Submandibular-sublingual glands; Humans; Nutrition. Foods and food supply; TX341-641; Carbonic acid
• Online Access: https://doi.org/10.1016/j.jff.2020.104173; https://doaj.org/article/400a1e7bfa354ea78fde96aa2caae466

Carbonic acid tablets containing citric acid and sodium bicarbonate were designed to dissolve in aqueous solution, and release carbon dioxide (CO2). The effect of the carbonic acid tablets on salivary secretion was examined in humans. Healthy male volunteers participated in the whole salivary flow secretion (n = 6) and submandibular-sublingual (SMSL) gland and parotid gland salivary flow secretion (n = 12) studies. Placement of a carbonic acid tablet on the apex of the tongue increased the whole saliva volume. The carbonic acid tablets promoted SMSL salivary secretion, but had less effect on parotid salivary secretion. A citric acid tablet, an acidic tastant, promoted both SMSL and parotid salivary secretion. A tablet containing only sodium bicarbonate, a component of the carbonic acid tablet, had no effect on SMSL salivary secretion. In conclusion, a carbonic acid stimulus specifically enhances salivary secretion from SMSL glands via the formation of CO2.