%0 Journal Article
%T The Effect of Umami Stimulation on Salivary Secretion Rate and Duration
%A Eri Sambuichi
%A Rumi Nishimura
%A Shiho Morishita
%A Shigeru Watanabe
%J Health
%P 52-59
%@ 1949-5005
%D 2024
%I Scientific Research Publishing
%R 10.4236/health.2024.161005
%X Purpose: Umami
reportedly promotes salivation. We aimed to investigate the effects of taste
stimuli on slow and fast salivary secretion in humans using umami, sweet, and
sour stimuli. Methods: Eight healthy women participated between 14:00
and 15:00, taking the circadian rhythm of salivary secretion into account. The
types and concentrations of the taste solutions were glutamic acid (1.7 ¡Á 10−3 M), inosinic acid (9.8 ¡Á 10−3 M), and guanylic acid (9.8 ¡Á 10−3 M) for umami stimulation, citric acid (6.5 ¡Á 10−3 M) for acidity
stimulation, and sucrose (1.6 ¡Á 10−2 M) for sweetness stimulation.
First, the unstimulated salivary flow rate was measured. Then, 3 ml of a flavor
solution was dropped under the tongue using a syringe. The saliva was expelled
into an aluminum cup every minute and weighed. The first minute¡¯s value minus 3
ml flavor solution was the stimulated salivary secretion rate produced by each
flavor. The time-to-return to the initial unstimulated salivary flow rate was
the duration of the stimulated saliva secretion rate. Results: The mean
unstimulated salivary flow rate across participants was 0.64 ¡À 0.25
ml/min (range: 0.23 - 1.03
ml/min). The highest amount of saliva was induced by citric acid. There were
significant differences between citric acid and the other flavor solutions (p
< 0.05 for glutamic acid, inosinic acid, and sucrose; p < 0.01 for
guanylic acid). There were no significant differences in duration of salivation
between the flavor solutions. When the participants were divided into slow
(0.45 ¡À 0.16
ml/min) and fast groups (0.83 ¡À 0.15 ml/min) based on their median resting salivary
secretion rate, there were no significant differences between the two groups in
the amount of saliva secreted at 1 minute after stimulation and the duration of
the salivary secretion rate. Conclusion: Umami stimulation was effective
in slowing salivary secretion and sustaining salivary secretion after
stimulation.
%K Salivary Secretion
%K Umami Flavor
%K Oral Health
%K Stimulated Salivary Secretion
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=130639